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HomeMy WebLinkAboutWPO202200020 Calculations 2023-02-23SHIMP ENGINEERING, P.C. Design Focused Engineering SHIMP ENGINEERING, P.C. Design Focused Engineering Stormwater Management Plan Calculation Packet Project Name: SOUTH PANTOPS DRIVE PARCEL 20R. Prepared by: Shimp Engineering P.C. Revision date: February 21, 2023 U No. 45183 2121123 Al, SHIMP ENGINEERING, P.C. Design Focused Engineering Table of Contents Cover Page Table of Contents Project Narrative Project Description SWM Quantity SWM Quality Pre -Development Stormwater Management Calculations: Pre -Development Drainage Area Map Pre -Development HydroCAD Analysis to outfall Post -Development Stormwater Management Calculations: Post -Development Drainage Area Map Post -Development HydroCAD Analysis to outfall. Energy Balance Equation Flood protection compliance check Post -Development Ditch & inlet Drainage Area Map VDOTLD-204 VDOT LD-229 VDOT LD-268 SWM Quality Requirements: Post-Dev NEW VRRM Landuse Map NEW VRRM -Development Spreadsheet Independent Reports: Excerpt from NRSC Soils Report NOAA Precipitation Report Appendix A: Rip- Rap Calculation SHIMP ENGINEERING, P.C. Design Fowsed Engineering Mr. John Anderson Albemarle County Department of Community Development 401 McIntire Road Charlottesville, VA 22902 Regarding: South Pantops Drive Parcel - 20R Stormwater Management Plan Proiect Description The purpose of this project at South Pantops Drive — Parcel 20R is to build a thirteen (13) Units townhouse development. All SWM calculations required are contained within the following report. The development property has an area of 5.34 acres and the development will disturb a total area of 1.20 acres. The proposed stormwater design meets water quality requirements set forth in 9VAC25-870-65 and water quantity requirements set forth in 9VAC25-870-66-B.(3) and 9VAC25-870-66-C(3)c SKM Ouantity The runoff from this development is released into the manmade channel in compliance with quantity regulation detailed in 9VAC25-870-66-B(3)A (channel protection) and 9VAC25-870-66-C(3).0 (Flood protection): SWM Quantity is satisfied by analyzing concentrated runoff from the development at the site outfall at the southwest comer of the development property. 9vac25-870-66-B(3)A requires that concentrated runoff from development at the site outfall meet the energy Balance Equation. To achieve this, concentrated runoff from the limits of disturbance area will be routed to an underground detention facility and then to the site outfall. When the Energy balance equation is being used to determine the allowable discharge, the improvement factor would need only be applied to the "site" as per the regulatory language of 9vac25-870.66.B.3 in this case, the application of energy balance to the discharge from the site would be calculated as follows: The HydroCAD analysis was done by: 1. Analyzing the pre and post development of the drainage area that falls inside the limits of disturbance (Onite) in one sub -catchment. From this calculation, we obtained the Q1Pre- Developed Site, RV,Pre-Developed Site, and RV1Post-Developed Site, Q,Pre-Developed Offsite, RV,Pre-Developed Offsite, and RV,Post-Developed Offsite then using the EBE. Where: rRViPre, sirel r RViPre, offsite Q1 Past = Q3 Presite ` J ��F) + Q1 Pre,offsite ` RV3 Post, site RV, past,Of fsite ) Qipo� = 1-year allowable post -development peak discharge from site (includes offsite run-on) Qipre = 1-year pre -development peak discharge from site (Q1pre, site) or offsite area (Qipm. offsite) RV,p, = 1-year pre -development runoff volume from site (RV1p�t, sire) or offsite area (RV,p, ogre) RVlp.t = 1-year post -development runoff volume from site (RVipm,sire) or offsite area (RV1p.,.Mite) SHIMP ENGINEERING, P.C. Design Powsed Engineering The improvement factor IT: 0.8 when the limits of disturbance is more than 1 acre 0.9 when the limits of disturbance is less than 1 acre 1.0 when site is wooded (land conditions in the pre development stage inside the limits of disturbance are wooded) Note: This site is fully wooded, IF used for the EBE calculations = 1, because the energy balance equation states nor shall QDeveloped be required to be less than that calculated in the equation (QForest RVForest)/RVDeveloped. Table 1 show Flowrate summary. Table 1 : Energy Balance Equation Summary Q1 Post(Max ADowed) CIS I QI Post (Max Achieved) Cfs OUTFALLI 1.85 1 1.77 Note: 0.10 acres (the relatively flat area above the detention pipe) will sheet flow into the onsite woods with no downstream impact. This area is identifiable on plans and in the field as an existing flat "bench" on the slopes there. The surface of this area is mostly compacted soil without undergrowth due to human activity. When this area is regraded and stabilized, we expect less runoff volume from this "bench". For these reasons, runoff from this 0.10-acre area complies with 9VAC25-870-66-D. Channel protection: Concentrated runoff flowing thru the site shall be routed via new storm drains into the natural channel which will release runoff at rates which comply with the energy balance equation 9VAC25-870-66-B(3)A. Flood protection: To meet flood protection requirements post -development run-off will be discharged into a channel which is located in a mapped floodplain. Thus, this is the limits of analysis and no further analysis is required. concentrated runoff release to the outfall is contained within adequate manmade channel. Ref LD-268 ditch design analysis. This is compliant 9VAC25-870-66-C(3).0 SWM Quality 1. Per the NEW VRRM spreadsheet, no further total phosphorous treatment is required. 2. Water quality will be provided with dedication of 3.24 acres land into a swm forest/open space easement. SHIMP ENGINEERING, P.C. Design Focused Engineering Pre -Development Stormwater Management Calculations: Pre -Development Drainage Area Map Pre -Development HydroCAD Analysis to Outfall PREDEV DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R REVISION DATE: 16 FEBRUARY 2023 E 1;113 ii FMSG: B 1 i r y'� I I AV 00 0 100 200 300 23F HS:;: S ,x: zy-- .� � WOOD - ' \x` TURF ----------= 23B SG: B -PRE DA 2.20 AC TOTAL LIMITS OF I1.20 ACRES PRESERVED SLOPE I------ - - - - \ \ ,., •. ,, ..___..ram - _�- _.._ _.._ —---1...-._ � , �\��\.. LEGEND PRE-DEV DA WOODS PRE-DEV DA TURF ® PRE-DEV DA IMPERVIOUS SHIMPEANYEERM,, P• C. ENG/NEER/NG-lANDF ANNGYG-PROJECTMANAGEMEAT 912 EAST HIGH ST E: (u.) ? 23B HSG: B �� WATER FLOW DIRECTIONAL ARROW �-- LIMITS OF DISTURBANCE ■ow PRE-DEV DA TOTAL r- Pre —On Pre -Development HydroCAD Report South Pantops Drive Parcel 20R 2L OUTFALL S4 Reach Aon Llnk Offsite Pre Dev NEW LOD Prepared by {enter your company name here) Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.130 58 Woods/grass comb., Good, HSG B (1S, 2S) 0.520 61 >75% Grass cover, Good, HSG B (1S, 2S) 0.550 98 Paved parking, HSG B (1S, 2S) 2.200 TOTAL AREA Pre —Drainage Areas Printed 2/21/2023 Pre Dev NEW LOD Prepared by {enter your company name here) Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.200 HSG B 1S, 2S 0.000 HSG C 0.000 HSG D 0.000 Other 2.200 TOTAL AREA Pre —Drainage Areas Printed 2/21/2023 Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 4 Time span=5.00-60.00 hrs, dt=0.05 hrs, 1101 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Pre_Onsite Runoff Area=0.720ac 30.56%Impervious Runoff Depth=0.73" Tc=5.0 min CN=70 Runoff=0.90 cfs 0.044 of Link 2L: OUTFALL Inflow=2.47 cfs 0.123 of Primary=2.47 cfs 0.123 of Subcatchment2S: Pre_Offsite Runoff Area=1.480 ac 22.30% Impervious Runoff Depth=0.64" Tc=5.0 min CN=68 Runoff=1.58 cfs 0.079 of Total Runoff Area = 2.200 ac Runoff Volume = 0.123 of Average Runoff Depth = 0.67" 75.00% Pervious = 1.650 ac 25.00% Impervious = 0.550 ac Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: Pre_Onsite Runoff = 0.90 cfs @ 11.97 hrs, Volume= 0.044 af, Depth= 0.73" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=3.03" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.460 58 Woods/grass comb., Good, HSG B 0.720 70 Weighted Average 0.500 69.44% Pervious Area 0.220 30.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Link 2L: OUTFALL Inflow Area = 2.200 ac, 25.00% Impervious, Inflow Depth = 0.67" for 1-yr event Inflow = 2.47 cfs @ 11.97 hrs, Volume= 0.123 of Primary = 2.47 cfs @ 11.97 hrs, Volume= 0.123 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Summary for Subcatchment 2S: Pre_Offsite Runoff = 1.58 cfs @ 11.97 hrs, Volume= 0.079 af, Depth= 0.64" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=3.03" Area (ac) CN Description 0.330 98 Paved parking, HSG B 0.480 61 >75% Grass cover, Good, HSG B 0.670 58 Woods/grass comb., Good, HSG B 1.480 68 Weighted Average 1.150 77.70% Pervious Area 0.330 22.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 6 Time span=5.00-60.00 hrs, dt=0.05 hrs, 1101 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Pre_Onsite Runoff Area=0.720ac 30.56%Impervious Runoff Depth=2.45" Tc=5.0 min CN=70 Runoff=3.17 cfs 0.147 of Link 2L: OUTFALL Inflow=9.23 cfs 0.427 of Primary=9.23 cfs 0.427 of Subcatchment2S: Pre_Offsite Runoff Area=1.480 ac 22.30% Impervious Runoff Depth=2.27" Tc=5.0 min CN=68 Runoff=6.06 cfs 0.280 of Total Runoff Area = 2.200 ac Runoff Volume = 0.427 of Average Runoff Depth = 2.33" 75.00% Pervious = 1.650 ac 25.00% Impervious = 0.550 ac Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 1S: Pre_Onsite Runoff = 3.17 cfs @ 11.96 hrs, Volume= 0.147 af, Depth= 2.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.54" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.460 58 Woods/grass comb., Good, HSG B 0.720 70 Weighted Average 0.500 69.44% Pervious Area 0.220 30.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Link 2L: OUTFALL Inflow Area = 2.200 ac, 25.00% Impervious, Inflow Depth = 2.33" for 10-yr event Inflow = 9.23 cfs @ 11.96 hrs, Volume= 0.427 of Primary = 9.23 cfs @ 11.96 hrs, Volume= 0.427 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Summary for Subcatchment 2S: Pre_Offsite Runoff = 6.06 cfs @ 11.96 hrs, Volume= 0.280 af, Depth= 2.27" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.54" Area (ac) CN Description 0.330 98 Paved parking, HSG B 0.480 61 >75% Grass cover, Good, HSG B 0.670 58 Woods/grass comb., Good, HSG B 1.480 68 Weighted Average 1.150 77.70% Pervious Area 0.330 22.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 8 Time span=5.00-60.00 hrs, dt=0.05 hrs, 1101 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Pre_Onsite Runoff Area=0.720ac 30.56%Impervious Runoff Depth=5.42" Tc=5.0 min CN=70 Runoff=6.93 cfs 0.325 of Link 2L: OUTFALL Inflow=20.58 cfs 0.964 of Primary=20.58 cfs 0.964 of Subcatchment2S: Pre_Offsite Runoff Area=1.480 ac 22.30% Impervious Runoff Depth=5.17" Tc=5.0 min CN=68 Runoff=13.66 cfs 0.638 of Total Runoff Area = 2.200 ac Runoff Volume = 0.964 of Average Runoff Depth = 5.26" 75.00% Pervious = 1.650 ac 25.00% Impervious = 0.550 ac Pre Drainage Areas Pre Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 9 Summary for Subcatchment 1S: Pre_Onsite Runoff = 6.93 cfs @ 11.96 hrs, Volume= 0.325 af, Depth= 5.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=9.10" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.460 58 Woods/grass comb., Good, HSG B 0.720 70 Weighted Average 0.500 69.44% Pervious Area 0.220 30.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Link 2L: OUTFALL Inflow Area = 2.200 ac, 25.00% Impervious, Inflow Depth = 5.26" for 100-yr event Inflow = 20.58 cfs @ 11.96 hrs, Volume= 0.964 of Primary = 20.58 cfs @ 11.96 hrs, Volume= 0.964 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Summary for Subcatchment 2S: Pre_Offsite Runoff = 13.66 cfs @ 11.96 hrs, Volume= 0.638 af, Depth= 5.17" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=9.10" Area (ac) CN Description 0.330 98 Paved parking, HSG B 0.480 61 >75% Grass cover, Good, HSG B 0.670 58 Woods/grass comb., Good, HSG B 1.480 68 Weighted Average 1.150 77.70% Pervious Area 0.330 22.30% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST SHIMP ENGINEERING, P.C. Design Focused Engineering Post -Development Stormwater Management Calculations: Post -Development Drainage Area Map Post -Development HydroCAD Analysis to Outfall Energy Balance Equation Flood protection compliance check Post -Development Ditch & Inlet Drainage Area Map VDOT LD-204 VDOT LD-209 VDOT LD-268 PREDEV DRAINAGE MAP / A, SOUTH PANTOPS DRIVE PARCEL 20R /; REVISION DATE: 16 FEBRUARY 2023 jjj� II 1{ , `\ i i \ , ]\Al - -__ ��J�i 1 H2GBB j i i ';f ' i'i�, 1 ,,, \ ) � POST DA 2.62 AC ; �`� ----_ , TURFS 1`, ` ,, / X� ix x x_ X�� _-- �.,OI j 1 �� 4� I i, ,,;I •; \`\ \ \, �% �� H �:4S_ �- � all NOTE: AREA SHEET FLOW IS NOT SUBJECT TO ANALYSIS FOR `�- " \ \ d ONSITE 4 CONCENTRATION RUN-ON. AS THERE IS NOT DOWNSTREAM IMPACT FOR INCREASED VOLUMES OF SHEET FLOW RUNOFF. `88 J OUITFALL - -- �� -� ,HSG: IB PRESERVED SLOPE AA i J � 13E _------- � _ HSG. B 100 SCALE: 1"=1 0 100 200 300 SHIMPENGINEERING, P.C. ENGLW,9IN6-L4NPFL4ANIN6 -RROELT MANAGEMEVT 812 �.. oEAST HIGH �.�. �. - E.G. JUSrNGSHI..- oNGERING-M i AREA ACRES TOTAL LIMITS OF DISTURBANCE 1.20 ACRES SHEET FLOW AREA- 0.10 AC 1 �. _ ------- -- '--- --------- LEGEND POST-DEV DA WOODS POST-DEV DA TURF oP-ul POST-DEV DA IMPERVIOUS POST-DEV DA MEADOW t- i ! \. HSG: B B WATER FLOW DIRECTIONAL ARROW - - LIMITS OF DISTURBANCE ■��■ POST-DEV DA TOTAL DA DETENTION PIPE Post_Onsite Dete MANAGED Post -Development HydroCAD Report South Pantops Drive Parcel 20R 2S Post_Offsit Managed 2� 5P CMP Underg'ound Detention\ 6L OUTFALL Sub4 Reach X 4on Llnk kE ,'Post Offsite UNMANAGED Post —Drainage Areas Post Dev NEW LOD Prepared by {enter your company name here) Printed 2/21/2023 Area Listing (selected nodes) Area CN Description (acres) (subcatchment-numbers) 0.130 58 Meadow, non -grazed, HSG B (1S, 3S) 0.660 58 Woods/grass comb., Good, HSG B (4S) 0.900 61 >75% Grass cover, Good, HSG B (1S, 2S, 3S, 4S) 0.940 98 Paved parking, HSG B (1S, 2S, 3S, 4S) 2.630 TOTAL AREA Post —Drainage Areas Post Dev NEW LOD Prepared by {enter your company name here) Printed 2/21/2023 Soil Listing (selected nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.630 HSG B 1S, 2S, 3S, 4S 0.000 HSG C 0.000 HSG D 0.000 Other 2.630 TOTAL AREA Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 4 Time span=1.00-60.00 hrs, dt=0.05 hrs, 1181 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Post_OnsiteDetention Runoff Area=0.840ac 61.90%Impervious Runoff Depth=1.54" Tc=5.0 min CN=84 Runoff=2.33 cfs 0.108 of Subcatchment2S: Post_Offsite Managed Runoff Area=0.100 ac 90.00% Impervious Runoff Depth=2.38" Tc=5.0 min CN=94 Runoff=0.40 cfs 0.020 of Subcatchment3S: Post Onsite Runoff Area=0.270 ac 40.74% Impervious Runoff Depth=0.98" Tc=5.0 min CN=75 Runoff=0.47 cfs 0.022 of Subcatchment4S: Post Offsite Runoff Area=1.420 ac 15.49% Impervious Runoff Depth=0.52" Tc=5.0 min CN=65 Runoff=1.16 cfs 0.062 of Pond 5P: CMP Underground Detention Peak Elev=382.83' Storage=2,588 cf Inflow=2.72 cfs 0.128 of Outflow=0.17 cfs 0.128 of Link 6L: OUTFALL Inflow=1.77 cfs 0.211 of Primary=1.77 cfs 0.211 of Total Runoff Area = 2.630 ac Runoff Volume = 0.211 of Average Runoff Depth = 0.96" 64.26% Pervious = 1.690 ac 35.74% Impervious = 0.940 ac Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: Post_Onsite Detention MANAGED Runoff = 2.33 cfs @ 11.96 hrs, Volume= 0.108 af, Depth= 1.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=3.03" Area (ac) CN Description 0.520 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.060 58 Meadow, non-orazed. HSG B 0.840 84 Weighted Average 0.320 38.10% Pervious Area 0.520 61.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 2S: Post_Offsite Managed Runoff = 0.40 cfs @ 11.95 hrs, Volume= 0.020 af, Depth= 2.38" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=3.03" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.100 94 Weighted Average 0.010 10.00% Pervious Area 0.090 90.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 3S: Post_Onsite UNMANAGED Runoff = 0.47 cfs @ 11.96 hrs, Volume= 0.022 af, Depth= 0.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type 11 24-hr 1-yr Rainfall=3.03" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 6 Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.070 58 Meadow, non -grazed, HSG B 0.270 75 Weighted Average 0.160 59.26% Pervious Area 0.110 40.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 4S: Post_Offsite UNMANAGED Runoff = 1.16 cfs @ 11.98 hrs, Volume= 0.062 af, Depth= 0.52" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 1-yr Rainfall=3.03" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.540 61 >75% Grass cover, Good, HSG B 0.660 58 Woods/grass comb., Good, HSG B 1.420 65 Weighted Average 1.200 84.51 % Pervious Area 0.220 15.49% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Pond 5P: CMP Underground Detention Inflow Area = 0.940 ac, 64.89% Impervious, Inflow Depth = 1.63" for 1-yr event Inflow = 2.72 cfs @ 11.96 hrs, Volume= 0.128 of Outflow = 0.17 cfs @ 12.73 hrs, Volume= 0.128 af, Atten= 94%, Lag= 46.6 min Primary = 0.17 cfs @ 12.73 hrs, Volume= 0.128 of Routing by Stor-Ind method, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Peak Elev= 382.83' @ 12.73 hrs Surf.Area= 1,180 sf Storage= 2,588 cf Plug -Flow detention time= 160.3 min calculated for 0.128 of (100% of inflow) Center -of -Mass det. time= 160.3 min ( 981.5 - 821.3 ) Volume Invert Avail.Storage Storage Description #1 380.00' 5,570 cf 72.0" D x 197.01 Pipe Storage Diam: 72" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 1-yr Rainfall=3.03" Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD@ 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 7 Device Routing Invert Outlet Devices #1 Primary 380.00' 18.0" Round 18" HDPE Culvert L= 20.0' Ke= 0.400 Inlet / Outlet Invert= 380.00' / 378.20' S= 0.0900 T Cc= 0.900 n= 0.012 #2 Device 1 380.00' 2.0" Vert. 1-Yr Orifice C= 0.600 #3 Device 1 383.00' 6.0" W x 6.0" H Vert. 10-YR Orifice C= 0.600 #4 Device 1 385.00' 4.5' long x 1.00' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 5.0' Crest Height Primary OutFlow Max=0.17 cfs @ 12.73 hrs HW=382.83' (Free Discharge) t1=18" HDPE Culvert (Passes 0.17 cfs of 13.16 cfs potential flow) 2=1-Yr Orifice (Orifice Controls 0.17 cfs @ 7.98 fps) 3=10-YR Orifice ( Controls 0.00 cfs) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Summary for Link 6L: OUTFALL Inflow Area = 2.630 ac, 35.74% Impervious, Inflow Depth = 0.96" for 1-yr event Inflow = 1.77 cfs @ 11.98 hrs, Volume= 0.211 of Primary = 1.77 cfs @ 11.98 hrs, Volume= 0.211 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 8 Time span=1.00-60.00 hrs, dt=0.05 hrs, 1181 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Post_OnsiteDetention Runoff Area=0.840ac 61.90%Impervious Runoff Depth=3.77" Tc=5.0 min CN=84 Runoff=5.50 cfs 0.264 of Subcatchment2S: Post_Offsite Managed Runoff Area=0.100 ac 90.00% Impervious Runoff Depth=4.84" Tc=5.0 min CN=94 Runoff=0.77 cfs 0.040 of Subcatchment3S: Post Onsite Runoff Area=0.270 ac 40.74% Impervious Runoff Depth=2.89" Tc=5.0 min CN=75 Runoff=1.40 cfs 0.065 of Subcatchment4S: Post Offsite Runoff Area=1.420 ac 15.49% Impervious Runoff Depth=2.02" Tc=5.0 min CN=65 Runoff=5.15 cfs 0.239 of Pond 5P: CMP Underground Detention Peak Elev=385.19' Storage=5,121 cf Inflow=6.28 cfs 0.304 of Outflow=2.96 cfs 0.304 of Link 6L: OUTFALL Inflow=8.03 cfs 0.609 of Primary=8.03 cfs 0.609 of Total Runoff Area = 2.630 ac Runoff Volume = 0.609 of Average Runoff Depth = 2.78" 64.26% Pervious = 1.690 ac 35.74% Impervious = 0.940 ac Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 9 Summary for Subcatchment 1S: Post_Onsite Detention MANAGED Runoff = 5.50 cfs @ 11.95 hrs, Volume= 0.264 af, Depth= 3.77" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.54" Area (ac) CN Description 0.520 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.060 58 Meadow, non-orazed. HSG B 0.840 84 Weighted Average 0.320 38.10% Pervious Area 0.520 61.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 2S: Post_Offsite Managed Runoff = 0.77 cfs @ 11.95 hrs, Volume= 0.040 af, Depth= 4.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.54" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.100 94 Weighted Average 0.010 10.00% Pervious Area 0.090 90.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 3S: Post_Onsite UNMANAGED Runoff = 1.40 cfs @ 11.96 hrs, Volume= 0.065 af, Depth= 2.89" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type 11 24-hr 10-yr Rainfall=5.54" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 10 Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.070 58 Meadow, non -grazed, HSG B 0.270 75 Weighted Average 0.160 59.26% Pervious Area 0.110 40.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 4S: Post_Offsite UNMANAGED Runoff = 5.15 cfs @ 11.96 hrs, Volume= 0.239 af, Depth= 2.02" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 10-yr Rainfall=5.54" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.540 61 >75% Grass cover, Good, HSG B 0.660 58 Woods/grass comb., Good, HSG B 1.420 65 Weighted Average 1.200 84.51 % Pervious Area 0.220 15.49% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Pond 5P: CMP Underground Detention Inflow Area = 0.940 ac, 64.89% Impervious, Inflow Depth = 3.88" for 10-yr event Inflow = 6.28 cfs @ 11.95 hrs, Volume= 0.304 of Outflow = 2.96 cfs @ 12.06 hrs, Volume= 0.304 af, Atten= 53%, Lag= 6.1 min Primary = 2.96 cfs @ 12.06 hrs, Volume= 0.304 of Routing by Stor-Ind method, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Peak Elev= 385.19' @ 12.06 hrs Surf.Area= 808 sf Storage= 5,121 cf Plug -Flow detention time= 125.3 min calculated for 0.304 of (100% of inflow) Center -of -Mass det. time= 125.4 min ( 923.0 - 797.7 ) Volume Invert Avail.Storage Storage Description #1 380.00' 5,570 cf 72.0" D x 197.01 Pipe Storage Diam: 72" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 10-yr Rainfall=5.54" Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 11 Device Routing Invert Outlet Devices #1 Primary 380.00' 18.0" Round 18" HDPE Culvert L= 20.0' Ke= 0.400 Inlet / Outlet Invert= 380.00' / 378.20' S= 0.0900 T Cc= 0.900 n= 0.012 #2 Device 1 380.00' 2.0" Vert. 1-Yr Orifice C= 0.600 #3 Device 1 383.00' 6.0" W x 6.0" H Vert. 10-YR Orifice C= 0.600 #4 Device 1 385.00' 4.5' long x 1.00' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 5.0' Crest Height Primary OutFlow Max=2.83 cfs @ 12.06 hrs HW=385.16' (Free Discharge) t1=18" HDPE Culvert (Passes 2.83 cfs of 19.14 cfs potential flow) 2=1-Yr Orifice (Orifice Controls 0.24 cfs @ 10.85 fps) 3=10-YR Orifice (Orifice Controls 1.66 cfs @ 6.65 fps) =Sharp -Crested Rectangular Weir(Weir Controls 0.93 cfs @ 1.31 fps) Summary for Link 6L: OUTFALL Inflow Area = 2.630 ac, 35.74% Impervious, Inflow Depth = 2.78" for 10-yr event Inflow = 8.03 cfs @ 11.97 hrs, Volume= 0.609 of Primary = 8.03 cfs @ 11.97 hrs, Volume= 0.609 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Post Drainage Areas Post Dev NEW LOD Type 11 24-hr 25-yr Rainfall= 6.81 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 12 Time span=1.00-60.00 hrs, dt=0.05 hrs, 1181 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Post_OnsiteDetention Runoff Area=0.840ac 61.90%Impervious Runoff Depth=4.96" Tc=5.0 min CN=84 Runoff=7.13 cfs 0.347 of Subcatchment2S: Post_Offsite Managed Runoff Area=0.100 ac 90.00% Impervious Runoff Depth=6.10" Tc=5.0 min CN=94 Runoff=0.96 cfs 0.051 of Subcatchment3S: Post Onsite Runoff Area=0.270 ac 40.74% Impervious Runoff Depth=3.98" Tc=5.0 min CN=75 Runoff=1.91 cfs 0.090 of Subcatchment4S: Post Offsite Runoff Area=1.420 ac 15.49% Impervious Runoff Depth=2.96" Tc=5.0 min CN=65 Runoff=7.57 cfs 0.350 of Pond 5P: CMP Underground Detention Peak Elev=385.59' Storage=5,405 cf Inflow=8.09 cfs 0.398 of Outflow=8.67 cfs 0.398 of Link 6L: OUTFALL Inflow=17.17 cfs 0.837 of Primary=17.17 cfs 0.837 of Total Runoff Area = 2.630 ac Runoff Volume = 0.837 of Average Runoff Depth = 3.82" 64.26% Pervious = 1.690 ac 35.74% Impervious = 0.940 ac Post Drainage Areas Post Dev NEW LOD Type 11 24-hr 25-yr Rainfall= 6.81 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 13 Summary for Subcatchment 1S: Post_Onsite Detention MANAGED Runoff = 7.13 cfs @ 11.95 hrs, Volume= 0.347 af, Depth= 4.96" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=6.81" Area (ac) CN Description 0.520 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.060 58 Meadow, non-arazed. HSG B 0.840 84 Weighted Average 0.320 38.10% Pervious Area 0.520 61.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 2S: Post_Offsite Managed Runoff = 0.96 cfs @ 11.95 hrs, Volume= 0.051 af, Depth= 6.10" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=6.81" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.100 94 Weighted Average 0.010 10.00% Pervious Area 0.090 90.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 3S: Post_Onsite UNMANAGED Runoff = 1.91 cfs @ 11.96 hrs, Volume= 0.090 af, Depth= 3.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type 11 24-hr 25-yr Rainfall=6.81" Post Drainage Areas Post Dev NEW LOD Type 11 24-hr 25-yr Rainfall= 6.81 " Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 14 Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.070 58 Meadow, non -grazed, HSG B 0.270 75 Weighted Average 0.160 59.26% Pervious Area 0.110 40.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 4S: Post_Offsite UNMANAGED Runoff = 7.57 cfs @ 11.96 hrs, Volume= 0.350 af, Depth= 2.96" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=6.81" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.540 61 >75% Grass cover, Good, HSG B 0.660 58 Woods/grass comb., Good, HSG B 1.420 65 Weighted Average 1.200 84.51 % Pervious Area 0.220 15.49% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Pond 5P: CMP Underground Detention Inflow Area = 0.940 ac, 64.89% Impervious, Inflow Depth = 5.08" for 25-yr event Inflow = 8.09 cfs @ 11.95 hrs, Volume= 0.398 of Outflow = 8.67 cfs @ 12.00 hrs, Volume= 0.398 af, Atten= 0%, Lag= 3.0 min Primary = 8.67 cfs @ 12.00 hrs, Volume= 0.398 of Routing by Stor-Ind method, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Peak Elev= 385.59' @ 12.00 hrs Surf.Area= 597 sf Storage= 5,405 cf Plug -Flow detention time= 112.3 min calculated for 0.398 of (100% of inflow) Center -of -Mass det. time= 112.4 min ( 902.8 - 790.4) Volume Invert Avail.Storage Storage Description #1 380.00' 5,570 cf 72.0" D x 197.01 Pipe Storage Diam: 72" Post Drainage Areas Post Dev NEW LOD Type 11 24-hr 25-yr Rainfall= 6.81 " Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 15 Device Routing Invert Outlet Devices #1 Primary 380.00' 18.0" Round 18" HDPE Culvert L= 20.0' Ke= 0.400 Inlet / Outlet Invert= 380.00' / 378.20' S= 0.0900 T Cc= 0.900 n= 0.012 #2 Device 1 380.00' 2.0" Vert. 1-Yr Orifice C= 0.600 #3 Device 1 383.00' 6.0" W x 6.0" H Vert. 10-YR Orifice C= 0.600 #4 Device 1 385.00' 4.5' long x 1.00' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 5.0' Crest Height Primary OutFlow Max=8.40 cfs @ 12.00 hrs HW=385.57' (Free Discharge) t1=18" HDPE Culvert (Passes 8.40 cfs of 20.02 cfs potential flow) 2=1-Yr Orifice (Orifice Controls 0.25 cfs @ 11.28 fps) 3=10-YR Orifice (Orifice Controls 1.83 cfs @ 7.34 fps) =Sharp -Crested Rectangular Weir(Weir Controls 6.32 cfs @ 2.51 fps) Summary for Link 6L: OUTFALL Inflow Area = 2.630 ac, 35.74% Impervious, Inflow Depth = 3.82" for 25-yr event Inflow = 17.17 cfs @ 11.99 hrs, Volume= 0.837 of Primary = 17.17 cfs @ 11.99 hrs, Volume= 0.837 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 16 Time span=1.00-60.00 hrs, dt=0.05 hrs, 1181 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS:Post_OnsiteDetention Runoff Area=0.840ac 61.90%Impervious Runoff Depth=7.16" Tc=5.0 min CN=84 Runoff=10.06 cfs 0.501 of Subcatchment2S: Post_Offsite Managed Runoff Area=0.100 ac 90.00% Impervious Runoff Depth=8.38" Tc=5.0 min CN=94 Runoff=1.30 cfs 0.070 of Subcatchment3S: Post Onsite Runoff Area=0.270 ac 40.74% Impervious Runoff Depth=6.04" Tc=5.0 min CN=75 Runoff=2.85 cfs 0.136 of Subcatchment4S: Post Offsite Runoff Area=1.420 ac 15.49% Impervious Runoff Depth=4.80" Tc=5.0 min CN=65 Runoff=12.23 cfs 0.568 of Pond 5P: CMP Underground Detention Peak Elev=385.72' Storage=5,475 cf Inflow=11.35 cfs 0.571 of Outflow=10.95 cfs 0.571 of Link 6L: OUTFALL Inflow=26.01 cfs 1.275 of Primary=26.01 cfs 1.275 of Total Runoff Area = 2.630 ac Runoff Volume = 1.275 of Average Runoff Depth = 5.82" 64.26% Pervious = 1.690 ac 35.74% Impervious = 0.940 ac Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 17 Summary for Subcatchment 1S: Post_Onsite Detention MANAGED Runoff = 10.06 cfs @ 11.95 hrs, Volume= 0.501 af, Depth= 7.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=9.10" Area (ac) CN Description 0.520 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.060 58 Meadow, non-arazed. HSG B 0.840 84 Weighted Average 0.320 38.10% Pervious Area 0.520 61.90% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 2S: Post_Offsite Managed Runoff = 1.30 cfs @ 11.95 hrs, Volume= 0.070 af, Depth= 8.38" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=9.10" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.100 94 Weighted Average 0.010 10.00% Pervious Area 0.090 90.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 3S: Post_Onsite UNMANAGED Runoff = 2.85 cfs @ 11.95 hrs, Volume= 0.136 af, Depth= 6.04" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type 11 24-hr 100-yr Rainfall=9.10" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 18 Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.000 58 Woods/grass comb., Good, HSG B 0.070 58 Meadow, non -grazed, HSG B 0.270 75 Weighted Average 0.160 59.26% Pervious Area 0.110 40.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Subcatchment 4S: Post_Offsite UNMANAGED Runoff = 12.23 cfs @ 11.96 hrs, Volume= 0.568 af, Depth= 4.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=9.10" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.540 61 >75% Grass cover, Good, HSG B 0.660 58 Woods/grass comb., Good, HSG B 1.420 65 Weighted Average 1.200 84.51 % Pervious Area 0.220 15.49% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, TOC POST Summary for Pond 5P: CMP Underground Detention Inflow Area = 0.940 ac, 64.89% Impervious, Inflow Depth = 7.29" for 100-yr event Inflow = 11.35 cfs @ 11.95 hrs, Volume= 0.571 of Outflow = 10.95 cfs @ 11.96 hrs, Volume= 0.571 af, Atten= 4%, Lag= 0.6 min Primary = 10.95 cfs @ 11.96 hrs, Volume= 0.571 of Routing by Stor-Ind method, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Peak Elev= 385.72' @ 11.96 hrs Surf.Area= 501 sf Storage= 5,475 cf Plug -Flow detention time= 97.3 min calculated for 0.570 of (100% of inflow) Center -of -Mass det. time= 97.5 min ( 878.3 - 780.8 ) Volume Invert Avail.Storage Storage Description #1 380.00' 5,570 cf 72.0" D x 197.01 Pipe Storage Diam: 72" Post_Drainage Areas Post Dev NEW LOD Type 11 24-hr 100-yr Rainfall= 9. 10 " Prepared by {enter your company name here) Printed 2/21/2023 HvdroCAD® 9.10 s/n 07054 ©2010 HvdroCAD Software Solutions LLC Paae 19 Device Routing Invert Outlet Devices #1 Primary 380.00' 18.0" Round 18" HDPE Culvert L= 20.0' Ke= 0.400 Inlet / Outlet Invert= 380.00' / 378.20' S= 0.0900 T Cc= 0.900 n= 0.012 #2 Device 1 380.00' 2.0" Vert. 1-Yr Orifice C= 0.600 #3 Device 1 383.00' 6.0" W x 6.0" H Vert. 10-YR Orifice C= 0.600 #4 Device 1 385.00' 4.5' long x 1.00' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) 5.0' Crest Height Primary OutFlow Max=10.74 cfs @ 11.96 hrs HW=385.71' (Free Discharge) t1=18" HDPE Culvert (Passes 10.74 cfs of 20.30 cfs potential flow) 2=1-Yr Orifice (Orifice Controls 0.25 cfs @ 11.42 fps) 3=10-YR Orifice (Orifice Controls 1.89 cfs @ 7.54 fps) =Sharp -Crested Rectangular Weir(Weir Controls 8.60 cfs @ 2.80 fps) Summary for Link 6L: OUTFALL Inflow Area = 2.630 ac, 35.74% Impervious, Inflow Depth = 5.82" for 100-yr event Inflow = 26.01 cfs @ 11.96 hrs, Volume= 1.275 of Primary = 26.01 cfs @ 11.96 hrs, Volume= 1.275 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 1.00-60.00 hrs, dt= 0.05 hrs Channel Protection: Energy Balance Equation with Run-on for OUTFALL SOUTH PANTOPS DRIVE - 20R 1 Yr, 24 Hr Storm Comparison Q lNa < Q t pry sae ((RV t ere, sae)/(RV i Post, sae))J.F.)+ Q i era oevte ((RV i era oassrep(RV i Post, aiaae)) I.F. — 0.8 when LOD> 1 ac, I.F.-0.9 when LOD < 1 ac, I.F. = LO when predev site is fully forested PreDev Site Fully Forested? — YES LF. = 1 Limits of Disturbance — 1.10 ac Onsite Offsite Pre Dev Area Onsite = 0.72 ac Pre Dev DA Offsite — 1.48 ac Post Dev Area Omite = 0.84 ac Post Dev DA OflSite — 1.52 ac Q t Pre. sae = 0.90 cfs Q t pre, ooiae = 1.58 cfs RV i Pre, sae = 0.044 of RV i P ,otere — 0.079 of RV i Post, sae — 0.130 of RV t No of — 0.081 of Predev 1-yr Flow Rate Sum Qlpre,site +Qlpre, Otfsite = 2.48 cps Regulatory Maximum Postdev 1-yr Flow Rate Max Qlpmr < 1.85 cfs Achieved Design Postdev 1-yr Flow Rate Design Qi,o = 1.77 cfs Energy Balance Equation Compliance Check: Achieved Notes' L The assumption in the calculation above is that the site equals the land -disturbing activity (LDA). The definition for "site" is not clearly defined m the regulations, but LDAs are defined as regulated. The water quantity criteria are applied to the site as per the regulations. This mence can be addressed by a VSMP authority on a case by case basis or as standard policy, although more stringent application of water quantity technical criteria should appear in local ordinances for locality VSW authorities. 2. This site discharges to an outfall within a natural channel, Since postdevelopment nmoffto this outfall meets the erergy balance equation, Channel Protection Requirements per 9VAC25-870-66-B.3.a are met, and channel protection requirements we satisfied. Flood Protection: Peak Flow Rate in Channel in Mapped Floodplain for Site Outfall SOUTH PANTOPS DRIVE - 2011 10 Yr, 24 Hr Storm Comparison Site outfall in mapped floodplain? = yes Regulatory Maximum 10-yr Flow Rate Qropre = Max Qtopost = 9.23 cfs Achieved Design Postdev 10-yr Flow Rate Design Qropost = 8.03 cfs Flood Protection Compliance Check: Achieved Notes: 1. In this case, the site discharges to a mapped floodplain, per 9VAC25-870-66-C-3c. Since 10-year runoff is confined within the stormwater conveyance system to this point of discarge, flood protection requirements are met. LEGEND POST-DEV DA WOODS POST-DEV DA TURF O® POST-DEV DA IMPERVIOUS mPOST-DEV DA MEADOW Scale: 1 "=50' - - LIMITS OF DISTURBANCE POST -DITCH DA TOTAL POST -INLET DA TOTAL I1 I I 1 , i \ --- i �/ �J� - -. y _fir--• .. >� ,y-•... _. Vz_ Vv i WOOD -- �- /--- O v vO 0 0\Q J x x TURF �- J ., '23B ,-- ----------- _HSG: R --- ----- o o°°p°°o°_o°�°-°�--- -� -64 to.*",qoi7o �?-'001 s 0000°000„ 0000O000 g s 000, pF0 00 00 00 O��Q oo �o,o0°°c ►�' - -`" ' FBI% whokm:'. I-' al its • � • • �a.��RlI\�� •���_�,�/%o • _ �`7� �,, ..�;`,` w..i�,� \ .`�\ : • :"` '=�� Inlet DA 0.40 AC __— \\ � \ \ \ ♦ \ \i%ea �w\� \` JJ VJ� �urJ� -ice- i �� i/ / �—'' ice/ //'' �'� � y `� \y\�,'� ��a •\\ �`. \\\ 3w � � ��___ - � �; ' - � �''� ��-` PRESERVED/ / ���� Ditch2.0 oko 0 I o \I J / I II , Ill l\ � \`♦` `�\\ �\\.\\\ \ \ FLOODWAY 50 DITCH & INLET DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R DATE: 10 JANUARY 2023 SHIMPENGINEERING, P.C." ENGINEERING-Is1NDRANNHO -PROJECT MANAGEMENT �H, LO.. �... V. 22902 . sr... M._E 3'EE..G SOUTH PANTOPS DRIVE - PARCEL 20R LD-204 Stormwater Inlet Computations Inlets on Grade Only Sag Inlets Only 9 'd F 0 79 .F� c m d G v "RI U F <a > •• W W 1 2 3 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 (ft) (ac) FM (in/hr) (efs) I (efs) (efs) 1 (10) 1 (10 (ft) (ft) 1 (efs) I (efs) (ft) (ft) (ft) A4 DI-2 8' 0.40 0.87 0.35 4.00 1.40 0.000 1.40 0.015 0.020 0.054 0.083 0.18 8.87 6.5 2.28 0.000 2.28 0.25 12.28 SOUTH PANTOPS DRIVE -PARCEL 20R Inlets Drama a Area Surarnmy Impervious C 0.9 Pervious C 0.3 Str. Type Str. No. Total Area (ft) % Imp Imp. (ft) Turf (ft) C :Area (ac) DI-2 A5 17,559 95% 16,681 878 0.87 0.40 SOUTH PANTOPS DRIVE - PARCEL 20R LD-229 STORM DRAIN DESIGN COMPUTATIONS From lb Catch. Runoff Inc Accun ToC Total Total Up Dn Pipe Inv Pipe Pipe Velocity Flow time Point Point Area Coef AC AC Intensi Flow(cfs) invert Invert Length Sloe Diameter Capacity Inc ac min in/hr El El ft % in) (cfs) (ft/s) (min 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 A5 A4 0.40 0.87 0.35 0.35 5.00 5.17 1.81 391.00 383.00 55.2 14.49% 15 26.64 12.39 0.02 •A3 A2 - - - 0.35 5.02 5.16 8.03 380.00 378.00 39.2 5.10% 15 25.70 12.85 0.02 •A2 Al - - - 0.35 5.02 5.16 8.05 374.00 370.03 32.3 12,29% 15 39.89 17.67 0.01 *Flow from h droCAD Q10-Year 0.3 C I Area SOUTH PANTOPS DRIVE - PARCEL 20R Modified LD-268 Roadside and Median Ditch Design Form Dosing Storm Side Slope I Min. I Max n=0.015 Concrete 0.04 DitchLO4 A CA Toc I - 1 in 12 110 Q - tin Q2 010 :1 L :1 R Slope Slope Allowable Velocity 2-yr 10-yr Matting Type Freeboard Channel Designed Depth SF AC INCR ACC Ft/Ft FVFt Velocity --Depth -Velocity "Depth 1 88370 2.03 0.95 0.95 5.0 11.0 5.17 6.81 0.95 6.12 11.81 3 1 3 0.23 0.34 20.0 17.36 0.35 17.67 0.48 EC-3 TYPE II 0.32 0.80 "Velocity calculations performed using maximum slope for this application "Depth calculations performed using minimum slope for this application "` Q2 & Q10 flow from hydroCAD Structure channel DA SHIMP ENGINEERING, P.C. Design Focused Engineering SWM Quality Requirements: Post -Development New VRRM Landuse Map New VRRM Development Spreadsheet LEGEND VRRM IMPERVIOUS VRRM TURF VRRM WOODS SWM FOREST / OPEN SPACE ElPOST-DEV DA MEADOW I \ I L ' X I IPRES -RVV� - -� SLOPES - \. m 0 80 160 224 NEW VRRM - DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R REVISION DATE: FEBRUARY 16, 2023 i�_STPTER - - .p • p - . WOOD _ _ _ - SWM FOREST/ OPEN SPACE TO BE DEDICATED 3.1 ACRES I RIVANNA RIVER TOTAL LIMITS OF DISTURBANCE ' 1.20 ACRES ., PRESERVED \\ ' SLOPES �\ \ `, \77 \ SCALE: 1 DE0 Viryinia Runoff Reduction Method New Development ComplianceSpreadsheet - Vertion 3.0 C 2011 BMP Standards and Spedficatlons ID 2013 Draft BMP Standards and Spedfications Project Name: South Pantop Drive -parcel 20R Date: 2/20/2023 BMp Design Spedffca0ons List. 2013 Draft Stds & Specs Site Information Post -Development Project (Treatment Volume and Loads) land Cover (acres) ASolls BSolls CSolls DSoils Totals sorest/open space lxres)- undisturbed, protected forest/open en rebrertM and 3.29 324 Managed Tudre )acs) f dkNNed, Soared for ow ores or other run to be medhnana d a.39 0'� Impervious Criver lanes) 0.62 0.62 •F LlOpen Space areas must be protected in accorearue with the Internet Runoff Reduction MCMotl 9.28 Constants Runoff Coefficients)Rv) Annual Rainfall(inches) 93 ASolls BSoils Csolls Osolls Tmget Rainfall Event(inches) 1.00 Farest/Open Space 0.02 0.03 0.09 0.05 Tofal Phosphorus RP) EMC(mgn) 0.26 1 Mansard! Tuff 0.15 0.20 0.22 0.25 Tofal Nitrogen (n) WC(mg/4 1.86 Impervious Cover 0.95 0.95 0.95 0.95 Taren Te lead (lb/a-/,) 0.41 Pj(unitless mrreRbn faller) 0.90 FmrWOpen Space Co.,(acres) 3.24 Trea(.cre-ft)lume D0629 Treatment Volume (cubic feet) 2,738 Tp bad(Ib/yr) 1.72 TN Loait(Iby) 12.31 IMarmmianal Purperver Onl Weighted RV (fiorert) 0.03 %Fri. ]]96 Managed Turf Cover(acres) 0.34 Weighted Rv (mrf) 0.20 %Managed Turf 8% Impervious Cwer(acres) 0.62 Rv(Improdous) 0.95 %Impervious 15% Site Area (acres) 4.20 Site RV 0.19 dat5 inpm sells n mot values calculation calls Nghb a. Ra.. MetleE.... DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet - Vemion 3.0 BMF Ceslgn Spetlfimnom Lkf. 2013 met Sids S Specs SRe Summary Proleel Ttle:3auth Panmp Drivc a-12011 Core:a eP Total Rainfall= 43 inches Site land Cover Summary R sons BSolls Csolh DSolh Talals %of Total farest/Dpen (acres) 0.00 330 O.N am 3.20 P Managed Turf (acres) 0.00 0.30 0.00 0.. 0.30 B Impervious Cowr(acres) 0.. rio2 0.N 0.. a62 15 42M 00 Site Tv and Land Cover Nutrient loads Ate as O. B Treatment Volume 2,238 TP load pb/yrl 1.72 Ire loai llb/w) 12.31 Total TP- Raducdon ReWlred lib/yrl O.RU TP LUDO REMMM iu (REQUIRED Site Compliance Summary Total Runoff Volume Reduction (ft') O .1IP Imtl Reducdon Achieved (lb/yr) 0.. TWal TR used Reduction Achieve! llb/w) 0.. Remaining Post Development TP used (ib/P) 1.R Remaining TP Loatl Reduction (lb/yr) Cb¢k Ermrsl Requlretl Error Summary: Errors an OA tools) DAw DAB DAC DAD DAE Tobl Poreu/open (acres) om C.m 0. O.RC o.oC a.aC Manage] Turf)acres) D.m D.m am Impervious Come (acres) 0.m 0.m am O.m o.m O.m Total wrea(.-I I 0.00 I a.m IOJq OA0 Olq O.m D.A w Errors) Dniname Area Compliance Su mmery BAR BAB DAC DAD DAE Tara) TP ¢ used Redutl (Ibtrl D.m DOM 0.m O.m 0.m B.m TR Iaa d Redu¢tl(lb/,) D.m am am O.m OM DOM Drainage Area A Summary and Cover Summary wsoRs BSolh C DSolh .1 xof.1 Porest/C en lanes) O.m O.m .Mls D.m 0.m Manage] Turf (acres) O.m O.m O.m 0.m Impervious Comer (acres) O.m O.m D.m 0.m O.m O O.m Bells Selecdons Managed Tuf InperNom Cover 1P land mom Bowmheam PrMI¢ Credit Area Credit Area BMPTreaMem Volume(ft') Upstream Untr..TPlnatl to RaN¢pbs) RRemovetl (Ib/N) TPRemalnl- (Ib/Vr) Treatmenito he (ones) laves) PrxtI-Rlas) Employed 3a. Permeable Pavemem. OSS 862.13 am B.50 0.32 0r. Tam l7rcious Cover Trem_21ed (M¢sl 0.21 Tamnrt area Treatetl laces) 0.m Tmmn used Reduction Achieved In DA Ib/ O.m Torsi TR used and scam Achieved In DA Ows") O.m Runoff Volume and M Calculations l year norm I 2.re2r nnm IDyearnnm Tagm Rainfall Event tin) 1 3.03 1 3.66 1 5.54 Calmgewreas RV BCN Dminage AmaA Palnage AreaB Dminage Am2C mairoge Area palnage Area Col 0 0 0 0 an 0 0 0 0 1-rear return penN Rnlwslnl nnR(wsml u. nN 0.. am n00 0.00 ono o.0] 0.a0 000 m.dyoas 0 0 0 0 0 2- War more perlN mRRlwsln) 0.00 ono o.0] 0.W 100 RRlwsln) o.a nor, O.m oaD 100 OR adrwaa 0 0 0 0 0 IOymr resum period mRnlwrn) p.m rm a.m Dda rm RRIwMn) O00 ON 0.0] Oup O00 m esumn D 0 0 0 $unmuy PM1v SHIMP ENGINEERING, P.C. Design Focused Engineering Independent Reports: Excerpt from NRSC Soils Report NOAA Precipitation Report Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrGs.usda.govtwps/ portal/nres/main/soils/healthn and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https:Hoffices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nrGs.usda.govtwps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) 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USDA is an equal opportunity provider and employer. 3 Contents Preface.................................................................................................................... 2 How Soil Surveys Are Made..................................................................................6 SoilMap.................................................................................................................. 9 SoilMap..............................................................................................................10 Legend................................................................................................................11 MapUnit Legend................................................................................................ 13 MapUnit Descriptions........................................................................................ 14 Albemarle County, Virginia..............................................................................17 10—Ronda loamy sand, 0 to 2 percent slopes, frequently flooded.............17 12C—Catoctin silt loam, 7 to 15 percent slopes ......................................... 17 12D—Catoctin silt loam, 15 to 25 percent slopes ....................................... 18 12E—Catoctin silt loam, 25 to 45 percent slopes........................................19 13E—Catoctin silt loam, 25 to 45 percent slopes, very stony.....................20 2313—Yadkin clay loam, 2 to 7 percent slopes............................................21 23C—Yadkin clay loam, 7 to 15 percent slopes..........................................22 26133—Dyke clay loam, 2 to 7 percent slopes, severely eroded.................23 47D—Philomont sandy loam, 15 to 25 percent slopes ............................... 24 58C—Myersville silt loam, 7 to 15 percent slopes.......................................25 58D—Myersville silt loam, 15 to 25 percent slopes.....................................26 58E—Myersville silt loam, 25 to 45 percent slopes.....................................27 59C—Myersville very stony silt loam, 7 to 15 percent slopes ..................... 28 59D—Myersville very stony silt loam, 15 to 25 percent slopes ................... 29 59E—Myersville very stony silt loam, 25 to 45 percent slopes ................... 30 71 B—Rabun clay loam, 2 to 7 percent slopes ............................................ 31 71C—Rabun clay loam, 7 to 15 percent slopes..........................................32 71 D—Rabun clay loam, 15 to 25 percent slopes ........................................ 33 71 E—Rabun clay loam, 25 to 45 percent slopes ........................................ 34 72133—Rabun clay, 2 to 7 percent slopes, severely eroded ........................35 72C3—Rabun clay, 7 to 15 percent slopes, severely eroded ..................... 36 72D3—Rabun day, 15 to 25 percent slopes, severely eroded ................... 37 72E3—Rabun clay, 25 to 45 percent slopes, severely eroded....................38 73C—Rabun clay loam, 7 to 15 percent slopes, very stony........................39 73D—Rabun clay loam, 15 to 25 percent slopes, very stony......................40 73E—Rabun clay loam, 25 to 45 percent slopes, very stony......................41 76—Dan River loam, 0 to 2 percent slopes, occasionally flooded .............. 42 79B—Meadowville silt loam, 2 to 7 percent slopes.....................................43 88—Udorthents, loamy, 2 to 25 percent slopes .......................................... 44 W—Water.................................................................................................... 44 Charlottesville City, Virginia.............................................................................46 48E—Philomont sandy loam, 25 to 45 percent slopes, very stony.............46 5513—Danripple loam, 2 to 7 percent slopes, rarely flooded.......................47 77—Dan River-Codorus complex, 0 to 2 percent slopes, occasionally flooded.................................................................................................. 48 91—Urban land...........................................................................................49 C! How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and rA Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. Ail.1 �} - l�^'r' 1 - 1.2C 71B - o.'` 7�2E37`1D 7.1B ,;,,71�1) 79B. 71 72C3 ' 23B 79B 71C' 71B •72B3 �,. 72C3 - r 77 W�76 12C ',23Cr .!"„ 23B .. B� 'v+71,B :�71E 7 9 B 72D3" ' 12C� �' 796 •7�11D 23B-•' 71B '4 7bC 58D - 39 s 79B 71D 4 n 'a 58C W s 58E 59E � a r � 23B * 71C 71B j1 �/ �.'L -y t8g ._ ; `h.. � `•� 1.2E 71 D 23C - y.8 23B ^f 1' 73D 23B � 7-i'E '23B 73E`� 59D '7 71D 73D 7 C88 `7�D 59C 'Ooa�. 55B W23B • - _. _ ems;:: ' 23B.' \ i 72 73C • -48E 59C 13E " 12E »� W 79B s' 17.1C'--* 23B . 72D3 71D 71 D 23� 3B 2 �-. .. •� 7.1C 23B 71• 71C 71D 23C 1120D 21 3� ' 23B 7-2D372��C _ MAPLEGEND Area of Interest (AOI) O Area of Interest (AOI) Soils Soil Map Unit Polygons N Soil Map Unit Lines Soil Map Unit Points Special Point Features V Blowout ® Borrow Pit Clay Spot O Closed Depression Gravel Pit Gravelly Spot O Landfill A. Lava Flow Marsh or swamp Mine or Quarry O Miscellaneous Water O Perennial Water y Rock Outcrop + Saline Spot Sandy Spot Severely Eroded Spot Q Sinkhole Slide or Slip Sodic Spot Custom Soil Resource Report to Spoil Area c Stony Spot W Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation �..ry Rails N Interstate Highways N US Routes Major Roads Local Roads Background . Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at scales ranging from 1:15,800 to 1:24,000. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 15, Sep 13, 2021 Soil Survey Area: Charlottesville City, Virginia Survey Area Data: Version 8, Sep 1, 2021 Your area of interest (AOI) includes more than one soil survey area. These survey areas may have been mapped at different scales, with a different land use in mind, at different times, or at different levels of detail. This may result in map unit symbols, soil properties, and interpretations that do not completely agree across soil survey area boundaries. Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2020—Sep 23, 2020 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 11 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 10 Ronda loamy sand, 0 to 2 0.6 0.1% percent slopes, frequently flooded 12C Catoctin silt loam, 7 to 15 9.8 1.1% percent slopes 12D Catoctin silt loam, 15 to 25 7.3 0.8% percent slopes 12E Catoctin silt loam, 25 to 45 17.5 2.0% percent slopes 13E Catoctin silt loam, 25 to 45 45.7 5.1% percent slopes, very stony 23B Yadkin clay loam, 2 to 7 percent 79.7 8.9% slopes 23C Yadkin clay loam, 7 to 15 22.0 2.5% percent slopes 26133 Dyke clay loam, 2 to 7 percent 1.2 0.1% slopes, severely eroded 47D Philomont sandy loam, 15 to 25 0.4 0.0% percent slopes 58C Myersville silt loam, 7 to 15 0.9 0.1% percent slopes 58D Myersville silt loam, 15 to 25 4.3 0.5% percent slopes 58E Myersville silt loam, 25 to 45 9.5 1.1% percent slopes 59C Myersville very stony silt loam, 6.9 0.8% 7 to 15 percent slopes 59D Myersville very stony silt loam, 27.9 3.1% 15 to 25 percent slopes 59E Myersville very stony silt loam, 1.8 0.2% 25 to 45 percent slopes 71 B Rabun Gay loam, 2 to 7 percent 31.5 3.5% slopes 71C Rabun Gay loam, 7 to 15 116.7 13.1% percent slopes 71 D Rabun clay loam, 15 to 25 1932 21.6% percent slopes 71 E Rabun clay loam, 25 to 45 34.2 3.8% percent slopes 72133 Rabun clay, 2 to 7 percent 9.0 1.0% slopes, severely eroded 72C3 Rabun Gay, 7 to 15 percent 18.0 2.0% slopes, severely eroded 72D3 Rabun Gay, 15 to 25 percent 11.1 1.2% slopes, severely eroded 13 Custom Soil Resource Report Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 72E3 Rabun clay, 25 to 45 percent slopes, severely eroded 0.3 0.0% 73C Rabun Gay loam, 7 to 15 percent slopes, very stony 0.6 0.1% 73D Rabun Gay loam, 15 to 25 percent slopes, very stony 14.3 1.6% 73E Rabun clay loam, 25 to 45 percent slopes, very stony 1.8 0.2% 76 Dan River loam, 0 to 2 percent slopes, occasionally flooded 8.0 0.9% 79B Meadowville silt loam, 2 to 7 percent slopes 41.5 4.6% 88 Udorthents, loamy, 2 to 25 percent slopes 82.1 9.2% W Water 17.4 1.9% Subtotals for Soil Survey Area 815.6 91.4% Totals for Area of Interest 892.8 100.0% Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 48E Philomont sandy loam, 25 to 45 percent slopes, very stony 6.1 0.7% 55B Danripple loam, 2 to 7 percent slopes, rarely flooded 6.9 0.8% 77 Dan River-Codorus complex, 0 to 2 percent slopes, occasionally flooded 29.9 3.3% 91 Urban land 5.2 0.6% 112D Catoctin - Urban land complex, 15 to 25 percent slopes 5.1 0.6% 171 C Rabun - Urban land complex, 7 to 15 percent slopes 24.0 2.7% Subtotals for Soil Survey Area 77.2 8.6% Totals for Area of Interest 892.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some 14 Custom Soil Resource Report observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into Iandforms or Iandform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The 15 Custom Soil Resource Report pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 16 Custom Soil Resource Report Albemarle County, Virginia 10—Ronda loamy sand, 0 to 2 percent slopes, frequently flooded Map Unit Setting National map unit symbol: 2v7hn Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Ronda, frequently flooded, and similar soils: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ronda, Frequently Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Sandy alluvium derived from igneous rock Typical profile Ap - 0 to 10 inches: loamy sand C1 - 10 to 43 inches: sand C2 - 43 to 79 inches: loamy sand Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: NoneFrequent Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 5w Hydrologic Soil Group: A Hydric soil rating: No 12C—Catoctin silt loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2xxxk IVA Custom Soil Resource Report Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Catoctin and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Catoctin Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 5 inches: silt loam Bw- 5 to 18 inches: very channery silt loam C - 18 to 28 inches: extremely channery silt loam R - 28 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 12D—Catoctin silt loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: 2yfhj Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days iV Custom Soil Resource Report Farmland classification: Not prime farmland Map Unit Composition Catoctin and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Catoctin Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 5 inches: silt loam Bw- 5 to 18 inches: very channery silt loam C - 18 to 28 inches: extremely channery silt loam R - 28 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No 12E—Catoctin silt loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: 2xxxi Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Catoctin and similar soils: 75 percent 19 Custom Soil Resource Report Estimates are based on observations, descriptions, and transects of the mapunit. Description of Catoctin Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 5 inches: silt loam Bw- 5 to 18 inches: very channery silt loam C - 18 to 28 inches: extremely channery silt loam R - 28 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: 20 to 40 inches to Iithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 13E—Catoctin silt loam, 25 to 45 percent slopes, very stony Map Unit Setting National map unit symbol: 2xxxm Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Catoctin, very stony, and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. 20 Custom Soil Resource Report Description of Catoctin, Very Stony Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 5 inches: silt loam Bw- 5 to 18 inches: very channery silt loam C - 18 to 28 inches: extremely channery silt loam R - 28 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Surface area covered with cobbles, stones or boulders: 1.5 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 2313—Yadkin clay loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2v7hx Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Yadkin and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. 21 Custom Soil Resource Report Description of Yadkin Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile Ap - 0 to 4 inches: clay loam BA - 4 to 10 inches: clay loam Bt - 10 to 63 inches: clay C - 63 to 88 inches: clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 23C—Yadkin clay loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2v7hy Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Yadkin and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Yadkin Setting Landform: Hillslopes PA Custom Soil Resource Report Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile Ap - 0 to 4 inches: clay loam BA - 4 to 10 inches: clay loam Bt - 10 to 63 inches: clay C - 63 to 68 inches: clay loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No 26133—Dyke clay loam, 2 to 7 percent slopes, severely eroded Map Unit Setting National map unit symbol: 2xxxr Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Dyke, severely eroded, and similar soils: 85 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Dyke, Severely Eroded Setting Landform: Fans Landform position (two-dimensional): Footslope Landform position (three-dimensional): Base slope Down -slope shape: Concave Across -slope shape: Convex 23 Custom Soil Resource Report Parent material: Residuum weathered from greenstone Typical profile Ap - 0 to 8 inches: clay loam Btl - 8 to 43 inches: clay 2Bt2 - 43 to 79 inches: gravelly clay Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 9.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 47D—Philomont sandy loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: 2v7jb Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Philomont and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Philomont Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile Ap - 0 to 5 inches: sandy loam Bt - 5 to 79 inches: sandy loam 24 Custom Soil Resource Report Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: A Hydric soil rating: No 58C—Myersville silt loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kbcn Elevation: 280 to 2,380 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Myersville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Myersville Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained 25 Custom Soil Resource Report Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 58D—Myersville silt loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kbcp Elevation: 300 to 1,460 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Myersville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Myersville Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches KV Custom Soil Resource Report Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No 58E—Myersville silt loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kbcq Elevation: 330 to 1,280 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Myersville and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Myersville Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.5 inches) PAFA Custom Soil Resource Report Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 59C—Myersville very stony silt loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kbcr Elevation: 440 to 1,790 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Myersville and similar soils: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Myersville Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Surface area covered with cobbles, stones or boulders: 7.0 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s tZ Custom Soil Resource Report Hydrologic Soil Group: B Hydric soil rating: No 59D—Myersville very stony silt loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kbcs Elevation: 360 to 1.770 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Myersville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Myersville Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Surface area covered with cobbles, stones or boulders: 7.0 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydrologic Soil Group: B Hydric soil rating: No 29 Custom Soil Resource Report 59E—Myersville very stony silt loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kbct Elevation: 360 to 1,620 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Myersville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Myersville Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 28 inches: silty clay loam H3 - 28 to 44 inches: silt loam H4 - 44 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Surface area covered with cobbles, stones or boulders: 7.0 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No M Custom Soil Resource Report 71 B—Rabun clay loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2xxyl Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Rabun and similar soils: 80 percent Estimates are based on observations, Description of Rabun descriptions, and transects of the mapunit. Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 31 Custom Soil Resource Report 71C—Rabun clay loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2xxyn Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun and similar soils: 80 percent Estimates are based on observations, Description of Rabun descriptions, and transects of the mapunit. Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No 0 Custom Soil Resource Report 71 D—Rabun clay loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: 2xxyk Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun and similar soils: 75 percent Estimates are based on observations, Description of Rabun descriptions, and transects of the mapunit. Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No 33 Custom Soil Resource Report 71 E—Rabun clay loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: 2xxym Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun and similar soils: 75 percent Estimates are based on observations, Description of Rabun descriptions, and transects of the mapunit. Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 34 Custom Soil Resource Report 72133—Rabun clay, 2 to 7 percent slopes, severely eroded Map Unit Setting National map unit symbol: 2xxyq Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, severely eroded, and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Severely Eroded Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Nose slope Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 4 inches: clay Bt - 4 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 9E Custom Soil Resource Report 72C3—Rabun clay, 7 to 15 percent slopes, severely eroded Map Unit Setting National map unit symbol: 2xxys Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, severely eroded, and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Severely Eroded Setting Landform: I nterfluves Landform position (two-dimensional): Shoulder Landform position (three-dimensional): Side slope Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 4 inches: clay Bt - 4 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No M Custom Soil Resource Report 72133—Rabun clay, 15 to 25 percent slopes, severely eroded Map Unit Setting National map unit symbol: 2xxyp Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, severely eroded, and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Severely Eroded Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 4 inches: clay Bt - 4 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No 37 Custom Soil Resource Report 72E3—Rabun clay, 25 to 45 percent slopes, severely eroded Map Unit Setting National map unit symbol: 2xxyr Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, severely eroded, and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Severely Eroded Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 4 inches: clay Bt - 4 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No W Custom Soil Resource Report 73C—Rabun clay loam, 7 to 15 percent slopes, very stony Map Unit Setting National map unit symbol: 2xxyw Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, very stony, and similar soils: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Very Stony Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 7 to 15 percent Surface area covered with cobbles, stones or boulders: 1.5 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 0 Custom Soil Resource Report 73D—Rabun clay loam, 15 to 25 percent slopes, very stony Map Unit Setting National map unit symbol: 2xxyt Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, very stony, and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Very Stony Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 15 to 25 percent Surface area covered with cobbles, stones or boulders: 1.5 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No C[t, Custom Soil Resource Report 73E—Rabun clay loam, 25 to 45 percent slopes, very stony Map Unit Setting National map unit symbol: 2xxyv Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun, very stony, and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun, Very Stony Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Linear Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 6 inches: clay loam Bt - 6 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 25 to 45 percent Surface area covered with cobbles, stones or boulders: 1.5 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B Hydric soil rating: No 41 Custom Soil Resource Report 76—Dan River loam, 0 to 2 percent slopes, occasionally flooded Map Unit Setting National map unit symbol: 2v7jz Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Prime farmland if protected from flooding or not frequently flooded during the growing season Map Unit Composition Dan river, occasionally flooded, and similar soils: 75 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Dan River, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 12 inches: loam Bw - 12 to 35 inches: silt loam C - 35 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: NoneOccasional Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: High (about 9.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: B Hydric soil rating: No Minor Components Hatboro, occasionally flooded Percent of map unit: 5 percent Landform: Flood plains EK Custom Soil Resource Report Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes 79B—Meadowville silt loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2v7k1 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Meadowville, occasionally flooded, and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Meadowville, Occasionally Flooded Setting Landform: Drainageways Landform position (two-dimensional): Footslope Landform position (three-dimensional): Head slope Down -slope shape: Concave Across -slope shape: Convex Parent material: Colluvium derived from igneous rock Typical profile A - 0 to 18 inches: silt loam Bt - 18 to 53 inches: silty clay loam 2C - 53 to 79 inches: gravelly clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: NoneOccasional Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 9.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 43 Custom Soil Resource Report 88—Udorthents, loamy, 2 to 25 percent slopes Map Unit Setting National map unit symbol: 2xxz3 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Udorthents and similar soils: 85 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Udorthents Setting Landform: I nterfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Properties and qualities Slope: 2 to 25 percent Depth to restrictive feature: More than 80 inches Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Minor Components Hatboro, occasionally flooded Percent of map unit: 5 percent Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes W—Water Map Unit Setting National map unit symbol: kbgk 44 Custom Soil Resource Report Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Water: 100 percent Estimates are based on observations, descriptions, and transects of the mapunit. Cl.. Custom Soil Resource Report Charlottesville City, Virginia 48E—Philomont sandy loam, 25 to 45 percent slopes, very stony Map Unit Setting National map unit symbol: 2v7jf Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Philomont, very stony, and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Philomont, Very Stony Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile Ap - 0 to 5 inches: sandy loam Bt - 5 to 79 inches: sandy loam Properties and qualities Slope: 25 to 45 percent Surface area covered with cobbles, stones or boulders: 1.5 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95 to 19.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Hydric soil rating: No GM Custom Soil Resource Report 55B—Danripple loam, 2 to 7 percent slopes, rarely flooded Map Unit Setting National map unit symbol: 2v7js Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Danripple, rarely flooded, and similar soils: 90 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Danripple, Rarely Flooded Setting Landform: Stream terraces Landform position (three-dimensional): Tread Down -slope shape: Convex Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile Ap - 0 to 7 inches: loam Bt - 7 to 42 inches: clay BC - 42 to 52 inches: clay loam C - 52 to 79 inches: sandy clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: About 60 to 72 inches Frequency of flooding: Rare Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 9.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C Hydric soil rating: No EVA Custom Soil Resource Report 77—Dan River-Codorus complex, 0 to 2 percent slopes, occasionally flooded Map Unit Setting National map unit symbol: 2v7k0 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Prime farmland if drained and either protected from flooding or not frequently flooded during the growing season Map Unit Composition Dan river, occasionally flooded, and similar soils: 50 percent Codorus, occasionally flooded, and similar soils: 40 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Dan River, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 12 inches: loam Bw - 12 to 35 inches: silt loam C - 35 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: NoneOccasional Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 9.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: B Hydric soil rating: No M Custom Soil Resource Report Description of Codorus, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 8 inches: silt loam BA - 8 to 16 inches: silt loam Bwl - 16 to 26 inches: silty clay loam Bw2 - 26 to 40 inches: silty clay loam Bw3 - 40 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Somewhat poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 8 to 18 inches Frequency of flooding: NoneOccasional Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 11.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3w Hydrologic Soil Group: B/D Hydric soil rating: No Minor Components Hatboro, occasionally flooded Percent of map unit: 5 percent Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes 91—Urban land Map Unit Setting National map unit symbol: kbg5 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days 49 Custom Soil Resource Report Farmland classification: Not prime farmland Map Unit Composition Urban land: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Urban Land Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 6 inches: variable H2 - 6 to 79 inches: variable Properties and qualities Slope: 0 to 25 percent Depth to restrictive feature: 10 inches to densic material Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 13.04 in/hr) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s Hydric soil rating: No 112D—Catoctin - Urban land complex, 15 to 25 percent slopes Map Unit Setting National map unit symbol: 2r7b8 Elevation: 310 to 430 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Map Unit Composition Catoctin and similar soils: 55 percent Urban land: 40 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Catoctin Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Custom Soil Resource Report Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile H1 - 0 to 5 inches: silt loam H2 - 5 to 18 inches: very channery silt loam H3 - 18 to 28 inches: extremely channery silt loam H4 - 28 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low (about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B Hydric soil rating: No 171C—Rabun - Urban land complex, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2gjh5 Elevation: 330 to 430 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Rabun and similar soils: 50 percent Urban land: 40 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Rabun Setting Landform: Interfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone 51 Custom Soil Resource Report Typical profile H1 - 0 to 6 inches: clay loam H2 - 6 to 48 inches: clay H3 - 48 to 79 inches: silty clay loam Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 8.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No Description of Urban Land Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 6 inches: variable H2 - 6 to 79 inches: variable Properties and qualities Slope: 0 to 25 percent Depth to restrictive feature: 10 inches to densic material Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 13.04 in/hr) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nres.usda.govAvps/portal/ nres/deta i I/nations I/soi Is/?cid=n res 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www. nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www. nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142 p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepasture/?cid=stelprd b1043084 53 NOAA Atlas 14, Volume 2, Version 3 Location name: Charlottesville, Virginia, USA* Latitude: 38.0341°, Longitude:-78.4532° Elevation: 399.9 ft** ' source: ESRI Maps A -- source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, D. Martin, B. Lin, T. Parcybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)+ Average recurrence Interval (years) Duretion + z s +o zs so 1 100 oo zoo soo +000 -m 5in (0.3118-0392) (0.30 79A 466) (0.443-0.545) (0.497--0 613) (0.557-0687) (0.603-0.746) (0.645-0.802) (0.682-0854) (0.724-0 919) (0.78-0 974) 0.564 23 3 +0-min (0.508-0626) (0.606A.2745) (0.709-0873) (0.795-0980) (0.888-1310) (0.96-1.19) (1.02127) (1.08-135) (1. 5-145) 1 (1: 91..53) 0.706 0.844 1. +5-min (0.35-0..783) (0.762-0937) (0. 977-1610) (1.011224) : (13-21639) (1.22-31751) (1.291..61) (1.0-515.71) (1.4411..83) (1.50.�93) 30-min (0.8704607) 1 (1.05-1.29) 1 (1.274257) 1 (1.46- .80) 1 (1.67-2606) (1.83-2..27) (1.8-2.47) (2. 2-2.66) (2.30-22..91) (24 3-3.12) 4.11 60-min (1.09i34) (1.3�62) (1.63-2.01) (1.90.2.34) (2.22�74) (2. 839.07) (27 3-3.40) (2. 8-3.73) (3. 9�818) (3.544.55) 3.07 6.47 2-hr 3894) (1.27-1.66) (1.542.0) (19 3-2.50) (2.27�93) (26 83.48) (3. 3 (3.37-4A2) (3. 3-4591) (a. 0---5.60) (45 96.20) 3-hr (1.391..82) (1.68-2.20) (2.0-2.76) (2.45-3.22) (2.91-3.83) (3.9�734) (3.67-4.87) (4.05-5.43) (4.576.20) (4.996.86) 6-hr (17 92.29) (2.176) (2.66-3.43) (3.124.3) (3.734.84) (4. 55753) (4.77 628) (5.32-7808) (6.09 8822) (6.749.23) 3 9 85 11.2 +2-hr (22 42.90) (2. 9-3.50) (3.34-4.35) (3.95-5.15) (4.7".24) (5A7- 7..22) (68.27) 2 0. (6.99 9343) (8.2) (9.09-2.7) 24-hr (2.72 3340) (3. 9-4612) (4. 9--0 5..26) )(4.946.20) 5.54 (6. 38.59) (6.95---8..79) (7.94-0.1) 11 (9.M.6) (10b- 3.8) (11.8-15.7) 2-0ey (32 0-3.99) (3. 9-4384) (4. 3515) (57 8-7.22) (6.99-8.77) (7. 8-0160.1) (9.04-131.5) (102- 3.1) (11.8- 5.4) (13.1-1 3) 3-0ey (3.454.21) (4. 85.11) (5. 0�49) (6.22$$61) (7.52924) (8. 8--010.6) (9.72- 2.1) (10.9- 3.7) (12� 6.2) (14116- 8.2) 4-day 7 0. (34.44) (4.475.37) 86 (5. .82) (6.65-8.0) (8.059671) (9.19-121.2) (10.4-2.7) (11.73--14A) (13.5- 6.9) (15.0. 9.1) 8.6 7-day (4.3165.11) (5. 96.16) (6A7-07..70) (7.528?96) (9. 080.8) (102- 2.3) (11.5-13.9) (12 .7) (1470- 8.3) (162- 0.4) 10dey (4.91575) (5.96.90) (7.278852) (8.379.84) (9.91--111.7) (11.1213.2) (12.414.8) (138--16.6) (15.6-19.0) (17.1---21.1) 2 17.7 921.3) 20 dey (6.53- .47) p. 0-8.91) (9.41--10.8) (107- 2.2) (12.3-14.2) (13.6- 5.7) (15.0.17.4) (16.3- 9.0) (181 (19.4-3.1) 30 dey (8.06-9.11) (9.55-10.8) (11.3-2.8) (12.6-14.3) (14.3-16.2) (15.6-17.7) (16.8 9.2) (18.0- 0.6) (19572.6) (207?24.1) as -day (101U 1.3) 1 (11.9-13.4) 1 (13.9- 5.6) 1 (15.417.3) 1 (173- 9.5) 1 (187021.1) 1 (20.0. 2.7) (21.3-24.2) (2?9-5.2) (24.0.27.7) 60-day 73 (11.9-13.2) (14.0-15.6) (16.1- 8.0) (1778- 9.8) (1927---22.1) (212? 3.7) (22.6- 5.4) (239-25.0) (25z5- 9.0) (26720.5) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atias 14 document for more information. Back to Top PF graphical SHIMP ENGINEERING, P.C. Design Focused Engineering Appendix A: Rip -Rap Calculations