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HomeMy WebLinkAboutWPO202200020 Calculations 2022-05-06SHIMP ENGINEERING, P.C. Design Focused Engineering Stormwater Management Plan Calculation Packet Project Name: SOUTH PANTOPS DRIVE PARCEL 20R. Prepared by: Shimp Engineering P.C. Date: April 27, 2022 O� ,1 OF P cam, o u SIMP �y Lic No.45183 n21�2ti Al L SHIMP ENGINEERING, P.C. Design Focused Enginxrina 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 Pre -Development Time of Concentration Calculations Time of Concentration Nomographs Pre-DA & Post DA Post -Development Stormwater Management Calculations: Post -Development Drainage Area Map Post -Development HydroCAD Analysis to outfall. Energy Balance Equation Time of Concentration - TOC & TOC2 VDOT LD-204 VDOT LD-209 SWM Quality Requirements: Pre-Dev- VRRM Landuse Map Post-Dev VRRM Landuse Map VRRM Re -Development Spreadsheet Independent Reports: Excerpt from NRSC Soils Report NOAA Precipitation Report SHIMP ENGINEERING, P.C. Design icwsed Engineering April 26, 2022 Fluvanna 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 thirteen (13) Units townhouse. 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 1.21 acres. The proposed stormwater design meets water quantity requirements set forth in 9VAC25-870-66-B (3) and 9VAC25-870-66-C. S9W Quantity The runoff from this development is released into Cow Branch in compliance with quantity regulations detailed in 9VAC25-870-66-B (channel protection) and 9VAC25-870-66-B (flood protection). Channel protection: a portion of 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). Water quantity will be addressed by the food protection: we are releasing runoff a natural channel which does not flood. this natural channel outlets into the Rivanna river, at which limits of analysis per 9vac25-870. c.3.a are met because this site is less than 1% of the total Rivanna river watershed at this point. Note to reviewer: The channel is currently being surveyed, we will run flood calculation when this survey data is received, but for this first submittal, we can infer from observation, and preliminary analysis that the channel does not flood during the 10-yr storm, and our added runoff does not cause flooding. SKM Quality l.per the VRRM spreadsheet, no further total phosphorous treatment is required. 2.water quality will be addressed by the dedication of 4.0 acres land into a swm forestlopen 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 Time of Concentration Calculations Time of Concentration Nomographs Pre-Dev & Post-Dev LEGEND 0 PRE-DEV DA WOODS PRE-DEV DA TURF ® PRE-DEV DA IMPERVIOUS — WATER FLOW DIRECTIONAL ARROW — — LIMITS OF DISTURBANCE ■mm■ PRE-DEV DA TOTAL SHIMPENGINEERINO P,C. EN6INEERIN6-L4ADA4NN9N6 -EROHUMANAGEMENT Aw ��HIGH�. uoo .sM.sMIME �'E�IMG Mr.00� PREDEV DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R REVISION DATE: 16 APRIL 2022 ;Q� Pre -Development Hydrocad Report Pre Devel OFFSITE TO O IM -ALL ... Sub4 Reach Aon Llflk lopment OUTFALL PRE-Dev Hydrocad TOTAL Pre Dev 20.77 TC Type 11 24-hr 1 yr, 24 hr Rainfall=3.03" Prepared by {enter your company name here} Printed 4/26/2022 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 2 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Pre DevelopmentDA Runoff Area=32.350 ac 53.23% Impervious Runoff Depth=1.21" Tc=20.8 min CN=79 Runoff=41.69 cfs 3.263 of Link 2L: POA Inflow=41.84 cfs 3.300 of Primary=41.84 cfs 3.300 of Subcatchment3S: Pre Development Runoff Area=0.840 ac 23.81% Impervious Runoff Depth=0.52" Tc=5.0 min CN=65 Runoff=0.72 cfs 0.036 of Total Runoff Area = 33.190 ac Runoff Volume = 3.300 of Average Runoff Depth = 1.19" 47.51% Pervious = 15.770 ac 52.49% Impervious = 17.420 ac Pre Dev 20.77 TC Prepared by {enter your company name here} PRE-Dev Hydrocad TOTAL Type 11 24-hr 1 yr, 24 hr Rainfall=3.03" Printed 4/26/2022 Summary for Subcatchment 1S: Pre Development DA OFFSITE TO OUTFALL Runoff = 41.69 cfs @ 12.14 hrs, Volume= 3.263 af, Depth= 1.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 1 yr, 24 hr Rainfall=3.03" Area (ac) CN Description 17.220 98 Paved parking, HSG B 10.960 55 Woods, Good, HSG B 4.170 61 >75% Grass cover, Good, HSG B 32.350 79 Weighted Average 15.130 46.77% Pervious Area 17.220 53.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Link 2L: POA Inflow Area = 33.190 ac, 52.49% Impervious, Inflow Depth = 1.19" for 1 yr, 24 hr event Inflow = 41.84 cfs @ 12.14 hrs, Volume= 3.300 of Primary = 41.84 cfs @ 12.14 hrs, Volume= 3.300 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 3S: Pre Development ONSITE TO OUTFALL Runoff = 0.72 cfs @ 11.98 hrs, Volume= 0.036 af, Depth= 0.52" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 1 yr, 24 hr Rainfall=3.03" Area (ac) CN Description 0.200 98 Paved parking, HSG B 0.610 55 Woods, Good, HSG B 0.030 61 >75% Grass cover, Good, HSG B 0.840 65 Weighted Average 0.640 76.19% Pervious Area 0.200 23.81 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration PRE-Dev Hydrocad TOTAL Pre Dev 20.77 TC Type 11 24-hr 10 yr, 24 hr Rainfall=5.54" Prepared by {enter your company name here} Printed 4/26/2022 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 4 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Pre DevelopmentDA Runoff Area=32.350 ac 53.23% Impervious Runoff Depth=3.27" Tc=20.8 min CN=79 Runoff=115.32 cfs 8.820 of Link 2L: POA Inflow=115.89 cfs 8.962 of Primary=115.89 cfs 8.962 of Subcatchment3S: Pre Development Runoff Area=0.840 ac 23.81% Impervious Runoff Depth=2.02" Tc=5.0 min CN=65 Runoff=3.16 cfs 0.142 of Total Runoff Area = 33.190 ac Runoff Volume = 8.962 of Average Runoff Depth = 3.24" 47.51% Pervious = 15.770 ac 52.49% Impervious = 17.420 ac PRE-Dev Hydrocad TOTAL Pre Dev 20.77 TC Type 11 24-hr 10 yr, 24 hr Rainfall=5.54" Prepared by {enter your company name here} Printed 4/26/2022 HvdroCAD® 9.10 s/n 07054 © 2010 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1S: Pre Development DA OFFSITE TO OUTFALL Runoff = 115.32 cfs @ 12.13 hrs, Volume= 8.820 af, Depth= 3.27" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr, 24 hr Rainfall=5.54" Area (ac) CN Description 17.220 98 Paved parking, HSG B 10.960 55 Woods, Good, HSG B 4.170 61 >75% Grass cover, Good, HSG B 32.350 79 Weighted Average 15.130 46.77% Pervious Area 17.220 53.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Link 2L: POA Inflow Area = 33.190 ac, 52.49% Impervious, Inflow Depth = 3.24" for 10 yr, 24 hr event Inflow = 115.89 cfs @ 12.13 hrs, Volume= 8.962 of Primary = 115.89 cfs @ 12.13 hrs, Volume= 8.962 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 3S: Pre Development ONSITE TO OUTFALL Runoff = 3.16 cfs @ 11.97 hrs, Volume= 0.142 af, Depth= 2.02" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr, 24 hr Rainfall=5.54" Area (ac) CN Description 0.200 98 Paved parking, HSG B 0.610 55 Woods, Good, HSG B 0.030 61 >75% Grass cover, Good, HSG B 0.840 65 Weighted Average 0.640 76.19% Pervious Area 0.200 23.81 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration PRE-Dev Hydrocad TOTAL Pre Dev 20.77 TC Type 11 24-hr 100 yr, 24 hr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 4/26/2022 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 6 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Pre DevelopmentDA Runoff Area=32.350 ac 53.23% Impervious Runoff Depth=6.54" Tc=20.8 min CN=79 Runoff=226.82 cfs 17.630 of Link 2L: POA Inflow=228.10 cfs 17.966 of Primary=228.10 cfs 17.966 of Subcatchment3S: Pre Development Runoff Area=0.840 ac 23.81% Impervious Runoff Depth=4.80" Tc=5.0 min CN=65 Runoff=7.45 cfs 0.336 of Total Runoff Area = 33.190 ac Runoff Volume = 17.966 of Average Runoff Depth = 6.50" 47.51% Pervious = 15.770 ac 52.49% Impervious = 17.420 ac PRE-Dev Hydrocad TOTAL Pre Dev 20.77 TC Type 11 24-hr 100 yr, 24 hr Rainfall= 9. 10 " Prepared by {enter your company name here} Printed 4/26/2022 HvdroCAD® 9.10 s/n 07054 © 2010 HvdroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 1S: Pre Development DA OFFSITE TO OUTFALL Runoff = 226.82 cfs @ 12.13 hrs, Volume= 17.630 af, Depth= 6.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr, 24 hr Rainfall=9.10" Area (ac) CN Description 17.220 98 Paved parking, HSG B 10.960 55 Woods, Good, HSG B 4.170 61 >75% Grass cover, Good, HSG B 32.350 79 Weighted Average 15.130 46.77% Pervious Area 17.220 53.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Link 2L: POA Inflow Area = 33.190 ac, 52.49% Impervious, Inflow Depth = 6.50" for 100 yr, 24 hr event Inflow = 228.10 cfs @ 12.13 hrs, Volume= 17.966 of Primary = 228.10 cfs @ 12.13 hrs, Volume= 17.966 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 3S: Pre Development ONSITE TO OUTFALL Runoff = 7.45 cfs @ 11.96 hrs, Volume= 0.336 af, Depth= 4.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr, 24 hr Rainfall=9.10" Area (ac) CN Description 0.200 98 Paved parking, HSG B 0.610 55 Woods, Good, HSG B 0.030 61 >75% Grass cover, Good, HSG B 0.840 65 Weighted Average 0.640 76.19% Pervious Area 0.200 23.81 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration SOUTH PANTOPS DRIVE - PARCEL 20R Time of Concentration Calculations PREDEV TOC TO OUTFALL 100 ft Overland Flow 2.15% slope 0.35 C-value 10.70 min Seelye Chart 802.13 ft S.C. Flow 12.97% slope 2.40 fps velocity 5.57 min. NEH Figure 15-4 1081.2 ft Channel 88.0 ft height 4.50 min. Kirpich Chart TOC= 20.77 min. Pre Development TOC All ToC's assumed to be 5 minutes. This assumption dictates very conservative design factors. TC 1 5.0 1 MINUTES SOUTH PANTOPS DRIVE PRE & POST DEV TOC NOMOGRAPHS T = 0.225 0,12 S-0.19 G. -1.0 c urn. of l•uoeentmNaa Pa 630 Na6nnal mmedng Hwulhrwk Te=peedarr0 Fim Tom,, mnuge L=lengthcl Shlp,hN 35 - TRAVEL TIME FOR CHANNEL FLOW (10rp1ch Chart) Figueel6-4 Velorld versus slope for shallow concentm)e<I Now S +Slupw1S. "t C = Raficnal'C' Value )ar Grouruf Characho 600 30 an 0.a0 n.Rn H (feet) 500 Paved 0.9 0.70 0.60 500 T c (ni n.) LL 3 a tb F i 400 0.8 25 300 0'7 0.8 10.60 min 200 B Soil 0.5 POST TOC 20 \ 10.60 min \ PRE TOC \ Poor 0'4 Z Grass 7 Su ~O 0.5 Average 0.3 III Grass\ a a 15� $undCO \ i 90 Dense \ �'� N �0 \ 5.0 W 0.2 (� BO �\ ��� 10 e'A 20 40 10 V) F Z w z Z Lu a i 0.60 n.nn n.60 0.20 o:oo 0.07 "� has uua 0.0a 0.02 °01" 2.4 FSP PRE TOC 200 4.50 MIN 4.50 MIN PRE TOC POST TOC ]00 too L (feet) 10000 50 e d ka'"P)e v 50 5000 Note: o ` ° a (1) For use eith naturet charnels; e 10 (2) For peved chamrela, wit:pty 10 10 t by 0.2 5 N K £ 5 z 500 5 ° c e t e 2� a 3 e eq 0 �z a� ,as ¢g t 2.4 FSP POST TOC 7.90 min 30 s POST TOC2 9 $ 0 u P 8 20 s Netipgr "C •' Vgrue err Selectee 0�g Q Cnorxter V Denx Grcaa 0.215 Rvea* 0.2.5 7 _ 1100 1 1 TIME OF CONCENTRATION OF SMALL DRAINAGE BASINS le( iv(Me) 'hble 16 9 F.moni. and moorptinns dovcloprd Rom Ngnrn 154 Fl-rope Oepfh Manrwrg'en Veluutyegoatlae Avar°ge Grose Suface 0.20 (ft) (Me) L ten 0.30 ..ow Grcee $Vr+ac* 0.36 Fgeeure 0•e0 6 io Bore Sglr 0. 48 POvac 0.90 Pavement and xmell nplaml yAh" 03 0.025 V=0329(s)"e Goo .d warcrwgya 0.4 0.050 v=1G.)R5(s)°-` Near(y bare mulmitiio,I rland Now); and alluaial fans in woebern mountain 0.2 0.051 Vd).065(ey- rcXioi ColfiaW,haightrnw imps N2 D.Orx6 V-83Cr'.z(s)a.s OVERLAND FLOW TIME �rto pamre 0.2 0.073 V=6.962(a)°' Mmmin tillage cultivaton, ronWu or smperoppeQ mid woo Hm& 0.2 0.101 V=6.06E(a)"' Fornst with bcaV ground lirrer and bay mmulows 0.2 0,202 V=2.51f(s)- Source: VDOT Plate 5-3 LEGEND TOC PRE TO POA -- -- OCPOST TOPOA TOC2 POST TO POA TOC NOMO LINE COLORS MATCH WITH NOTES IN TOC CALCS 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 Time of Concentration VDOT LD-204 VDOT LD-209 LEGEND POST-DEV DA WOODS KiPOST-DEV DA TURF POST-DEV DA IMPERVIOUS - WATER FLOW DIRECTIONAL ARROW - - LIMITS OF DISTURBANCE MEMO POST-DEV DA TOTAL SHIMPEMINEERM,, P, C. ENGINEERING-L4NDA4NNING-PROJEG7MANA6EMENT c"wn�aTrzaNut. �.. �zoo� �u¢n"asrav-ova N�aR"o.PoM 200 0 200 400 600 PREDEV DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R SCALE: 1 "=200' REVISION DATE: 16 APRIL 2022 Post -Development Hydrocad Report (8S) 9S POST DA offs' e to POS DA onsite to OUTFACE OUTFALL Z2L POA $Ubcat Reach Or1 Link Drainage Diagram for Post Dev 20.77 TC Prepared by {enter your company name here}, Printed 4/27/2022 HydroCAD® 9.10 s/n 07054 0 2010 HytlroCAD Software Solutions LLC Post Dev 20.77 TC Prepared by {enter your com Link 2L: POA POST-Dev Hydrocad TOTAL Type 11 24-hr 1 yr, 24 hr Rainfall=3.03" name here} Printed 4/27/2022 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment8S: POST DAoffsite to Subcatchment9S: POST DA onsite to Inflow=40.95 cfs 3.247 of Primary=40.95 cfs 3.247 of Runoff Area=32.420 ac 51.42% Impervious Runoff Depth=1.15" Tc=20.8 min CN=78 Runoff=39.43 cfs 3.108 of Runoff Area=1.140 ac 62.28% Impervious Runoff Depth=1.47" Tc=11.6 min CN=83 Runoff=2.44 cfs 0.140 of Total Runoff Area = 33.560 ac Runoff Volume = 3.247 of Average Runoff Depth = 1.16" 48.21% Pervious = 16.180 ac 51.79% Impervious = 17.380 ac Post Dev 20.77 TC Prepared by {enter your company name here} POST-Dev Hydrocad TOTAL Type 11 24-hr 1 yr, 24 hr Rainfall=3.03" Printed 4/27/2022 Summary for Link 2L: POA Inflow Area = 33.560 ac, 51.79% Impervious, Inflow Depth = 1.16" for 1 yr, 24 hr event Inflow = 40.95 cfs @ 12.14 hrs, Volume= 3.247 of Primary = 40.95 cfs @ 12.14 hrs, Volume= 3.247 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 8S: POST DA offsite to OUTFALL Runoff = 39.43 cfs @ 12.14 hrs, Volume= 3.108 af, Depth= 1.15" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 1 yr, 24 hr Rainfall=3.03" Area (ac) CN Description 16.670 98 Paved parking, HSG B 11.800 55 Woods, Good, HSG B 3.950 61 >75% Grass cover, Good, HSG B 32.420 78 Weighted Average 15.750 48.58% Pervious Area 16.670 51.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Subcatchment 9S: POST DA onsite to OUTFALL Runoff = 2.44 cfs @ 12.04 hrs, Volume= 0.140 af, Depth= 1.47" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 1 yr, 24 hr Rainfall=3.03" Area (ac) CN Description 0.710 98 Paved parking, HSG B 0.120 55 Woods, Good, HSG B 0.310 61 >75% Grass cover, Good, HSG B 1.140 83 Weighted Average 0.430 37.72% Pervious Area 0.710 62.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.6 Direct Entry, Time of Concentration Post Dev 20.77 TC Prepared by {enter your com Link 2L: POA POST-Dev Hydrocad TOTAL Type 11 24-hr 10 yr, 24 hr Rainfall=5.54" name here} Printed 4/27/2022 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment8S: POST DAoffsite to Subcatchment9S: POST DA onsite to Inflow=116.03 cfs 8.928 of Primary=116.03 cfs 8.928 of Runoff Area=32.420 ac 51.42% Impervious Runoff Depth=3.18" Tc=20.8 min CN=78 Runoff=112.22 cfs 8.580 of Runoff Area=1.140 ac 62.28% Impervious Runoff Depth=3.67" Tc=11.6 min CN=83 Runoff=5.98 cfs 0.348 of Total Runoff Area = 33.560 ac Runoff Volume = 8.928 of Average Runoff Depth = 3.19" 48.21% Pervious = 16.180 ac 51.79% Impervious = 17.380 ac Post Dev 20.77 TC Prepared by {enter your company name here} POST-Dev Hydrocad TOTAL Type 11 24-hr 10 yr, 24 hr Rainfall=5.54" Printed 4/27/2022 Summary for Link 2L: POA Inflow Area = 33.560 ac, 51.79% Impervious, Inflow Depth = 3.19" for 10 yr, 24 hr event Inflow = 116.03 cfs @ 12.13 hrs, Volume= 8.928 of Primary = 116.03 cfs @ 12.13 hrs, Volume= 8.928 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 8S: POST DA offsite to OUTFALL Runoff = 112.22 cfs @ 12.13 hrs, Volume= 8.580 af, Depth= 3.18" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr, 24 hr Rainfall=5.54" Area (ac) CN Description 16.670 98 Paved parking, HSG B 11.800 55 Woods, Good, HSG B 3.950 61 >75% Grass cover, Good, HSG B 32.420 78 Weighted Average 15.750 48.58% Pervious Area 16.670 51.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Subcatchment 9S: POST DA onsite to OUTFALL Runoff = 5.98 cfs @ 12.03 hrs, Volume= 0.348 af, Depth= 3.67" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 10 yr, 24 hr Rainfall=5.54" Area (ac) CN Description 0.710 98 Paved parking, HSG B 0.120 55 Woods, Good, HSG B 0.310 61 >75% Grass cover, Good, HSG B 1.140 83 Weighted Average 0.430 37.72% Pervious Area 0.710 62.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.6 Direct Entry, Time of Concentration Post Dev 20.77 TC Prepared by {enter your com Link 2L: POA POST-Dev Hydrocad TOTAL Type 11 24-hr 100 yr, 24 hr Rainfall= 9. 10 " name here} Printed 4/27/2022 Time span=0.00-60.00 hrs, dt=0.01 hrs, 6001 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment8S: POST DAoffsite to Subcatchment9S: POST DA onsite to Inflow=230.74 cfs 18.002 of Primary=230.74 cfs 18.002 of Runoff Area=32.420 ac 51.42% Impervious Runoff Depth=6.42" Tc=20.8 min CN=78 Runoff=223.64 cfs 17.334 of Runoff Area=1.140 ac 62.28% Impervious Runoff Depth=7.03" Tc=11.6 min CN=83 Runoff=11.11 cfs 0.668 of Total Runoff Area = 33.560 ac Runoff Volume = 18.002 of Average Runoff Depth = 6.44" 48.21% Pervious = 16.180 ac 51.79% Impervious = 17.380 ac Post Dev 20.77 TC Prepared by {enter your company name here} POST-Dev Hydrocad TOTAL Type 11 24-hr 100 yr, 24 hr Rainfall= 9. 10 " Printed 4/27/2022 Summary for Link 2L: POA Inflow Area = 33.560 ac, 51.79% Impervious, Inflow Depth = 6.44" for 100 yr, 24 hr event Inflow = 230.74 cfs @ 12.13 hrs, Volume= 18.002 of Primary = 230.74 cfs @ 12.13 hrs, Volume= 18.002 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Summary for Subcatchment 8S: POST DA offsite to OUTFALL Runoff = 223.64 cfs @ 12.13 hrs, Volume= 17.334 af, Depth= 6.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr, 24 hr Rainfall=9.10" Area (ac) CN Description 16.670 98 Paved parking, HSG B 11.800 55 Woods, Good, HSG B 3.950 61 >75% Grass cover, Good, HSG B 32.420 78 Weighted Average 15.750 48.58% Pervious Area 16.670 51.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 20.8 Direct Entry, Time of Concentration Summary for Subcatchment 9S: POST DA onsite to OUTFALL Runoff = 11.11 cfs @ 12.03 hrs, Volume= 0.668 af, Depth= 7.03" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-60.00 hrs, dt= 0.01 hrs Type II 24-hr 100 yr, 24 hr Rainfall=9.10" Area (ac) CN Description 0.710 98 Paved parking, HSG B 0.120 55 Woods, Good, HSG B 0.310 61 >75% Grass cover, Good, HSG B 1.140 83 Weighted Average 0.430 37.72% Pervious Area 0.710 62.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.6 Direct Entry, Time of Concentration Energy Balance Equation Summary for outfall "PROJECT NAME" 1 Yr, 24 Hr Storm Comparison: Qdeveloped!5 I.F.'s(QPre-Developed*RVPre-Developed)/RVDeveloped Qdeveloped!5 (QForested*RVForested)/RVDeveloped PreDev Site Fully Forested? = No PreDev Onsite Drainage Area = 1.15 ac PDA 1 Onsite Runoff: PostDev Onsite Drainage Area = 1.15 ac Qpre-developed = 0.72 (page o) I.F. = 0.8 RVPre-Developed = 0.036 (page xx) Max Qdeveloped = 0.15 cfs RVDeveloped = 0.140 (page xz) Channel Protection (9VAC25-870-66-B): Runoff to this outfall is compliant with 9VAC25-870-66-B.3.a because the total runoff to this point is reduced by an amount exceeding the reduction required by the energy balance equation. See Note to the right. Flood Protection (9VAC25-870-66-C): Outfall is in a natural channel prone to flooding. Site complies with 9VAC25-870-66-C(2)b because the developed 10-yr peak runoff is less than the pre -developed 10- yr runoff. 10-Yr Predev Runoff = 115.89 cfs, 10-yr Postdev Runoff = 116.03 cfs. meet Energy Balance Requirements, duce Flow @ POA 1 by: (Qpredev - Max Qdev) 0.72 - 0.15 = ACHIEVED REDUCTION = required reduction @ PDA Achieved Total Runoff (Including Offsite) PREDEV POSTDE 0.57 cfs REQUIRED I 10-YR QP e1 1.84 P.03 O st=16 5 0.89 cfs ACHIEVED 1-YR Flow Reduction 111f-11:1 10-YR Flow Reduction -0.14 Channel Protection Result: Since the 1-yr reduction of the total runoff (including offsite area) is greater than the reduction required by the Energy Balance Equation, Runoff at this POA is compliant with the Energy Balance Equation. SOUTH PANTOPS DRIVE - PARCEL 20R Time of Concentration Calculations - TOC POSTDEV TOC TO OUTFALL 100 ft Overland Flow 2.00% slope 0.35 C-value F1077 min Seelye Chart 802.13 ft S.C. Flow 12.97% slope 2.40 f s velocity 5.57 min. NEH Figure 15-4 1081.2 ft Channel 88.0 ft height 4.50 min. Kirpich Chart TOC= 20.77 min. SOUTH PANTOPS DRIVE - PARCEL 20R Time of Concentration Calculations -TOC2 POSTDEV TOC2 TO OUTFALL 100 ft Overland Flow 8.6% slope 0.35 C-value 7. 00 min Seelye Chart 445.34 ft S.C. Flow 18.5% slope 2.O fps velocity 3.7 min. NEH Figure 15-4 Channel height Fo.0 min. Kirpich Chart TOC= 11.61 min. no Channel on 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 LD-229 STORM DRAIN DESIGN COMPUTATIONS From To Catch. Runoff hic Accum ToC Total Total Up Dn Pipe hw Pipe Pipe Velocity Flow time Point Point Area Coef AC AC Intensi Flow cfs invert Invert Len Sloe Diameter Capacity Inc ac min in/IT El El 11 % in cfs ftls min 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 *A4 A3 040 0.87 0.35 0.35 5.00 5.17 1.81 394.50 387.50 84.55 8.28% 15 20.14 10.17 0.02 *A3 A2 - - - 0.35 5.02 5.16 1.81 383.26 381.00 39.4 5.74% 15 16.77 8.93 0.03 *A2 Al 035 503 516 1.81 376.50 376.03 18.94 2.48% 15 11.02 6.63 0.04 SHIMP ENGINEERING, P.C. Design Focused Engineering SWM Quality Requirements: Pre -Development VRRM Landuse Map Post -Development VRRM Landuse Map VRRM Re -Development Spreadsheet LEGEND ® VRRM IMPERVIOUS VRRM WOODS i 1-1 VRRM TURF 75 0 75 150 225 SCALE: 1 "=75' PRE VRRM DRAINAGE MAP SOUTH PANTOPS DRIVE PARCEL 20R REVISION DATE: 20 APRIL 2022 NTOP S OR�VE ,- PRESERVED SLOPES LEGEND POST VRRM DRAINAGE MAP VRRM IMPERVIOUS VRRM TURF SOUTH PANTOPS DRIVE PARCEL 20R 0o VRRM WOODS ❑ VRRM TURF REVISION DATE: 20 APRIL 2022 1 ` -N --_ TOPS THPPN 1,40 SOU i \\ \ k list- iellow otu it Ile le lot itIIITC"�Il:i{II ie �u Ie' le' 1 , e et Itiltlttttt�e It "'tltii�tii11111 II 111 I .e !Ie:i!e�e!ae �!�,I►;l;l!el1e!�,!E:I,•,!.n 75 0 75 150 225 SCALE: 1 "=75' ROUTE 1 _ is w IIRIe e1ClI1e1 k� egla:e!!ss. e111�1 I � IIn1i {IC�eltt!11 jtLLlttl Ie1p,1e�I�1e1P►itCllU IIIni1eiii RII `Ienln; a Ii11111e nyil 11Hill; Jleilil':� 11,.111IItl II,•_.,Ie••uo e I •a: •�n, Ie,l IF m tii°'II"' IIn!e .IL'1e�1, SWM FOREST/OPEN i AREA - 0 U p �fG�e •�IIIC e�i.�coes'z!o �I ele,eal� °`1C1eeC�i1C Ilu, is ,e lelo 'Iltth¢ie Ie1e111 1 el III I .C,IL� e 1 e � 1111 Ctt1li 1. 1C"� IC"I� � �: 1 III"11 Ie � IIi1eI��i1t ICICII1e�{IO IC 'Ittt� It'Ilet Ie1C1Ce's�6i 11 1a10a'e1C1e1C1C IRltltF.O 1 Ie aS.1 'Iltt I!'It-B,its . Itl% to � e I1C"1e • - 11 11 isle Ie "�tttt�ei tt ut Itie . !e•e:•Ie•!Iieul IIIe iti!Iie'• , �I'Ie a IIIe1 :nI,II'e1el•,Ie1eIE1s1e- ,. , r . Ie16�!tl�`it'IIe� �Bj`IiII �. • !Illlliteitteit�I � e Ie.. IRIj Project Name: SOUTH PANTOPS DRIVE PARCEL 20R Date: 4/26/2022 Linear Development Project? No Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) Cover dam input cells censtattvalues calculation cells Unerarprojer No Land rover areas entered correctly? ./ Total disturbed area entered? ./ TP LOAD REDUCTION NOT REQUIRED foresf/o ��� in spi 4J5 4.75 Managed Tuff (acres) --disturber graded for yards or other births, be mowed/man ed 0.20 0.20 Impervious cover (acres) 021 0.21 5.16 Post -Development Land Cover (acres( A Soils Bsails CSoils DSuits Totals Forest/Open Space (acres) -undisturbed, protected fimmWopen space or reforested land 4.13 4.13 Managed Tuff(acres) -- resumed, graded for yards or other hurt to be mowed/managed 0.31 0.31 Impervious cover (acres) 0.72 OJ2 Area Check OK. OK. OR. OK. 5.16 fatal Phosphorus [TP) FMC(mg/L) 0.26 fatal Nitrogen(TN) FMC(mg/L) 1.86 rarget TP Load(lb/acre/yr) 01 rj(undess correction factor) 0.90 • •• • •• Land Cover Summer y-Fete Pre-ReDevelopment Listed Adjurtedr Forest/Open Space Cover (acres) 4.75 4.24 f0ar_�rFF��rFU�tWi>•�WP Post ReOev. & New Impervious !d/Open Space 4,13 Id Cover Summary-P Lard Coversummory-Post PoSMLeDevelapment Post-Develapmem New Impervious Ipen space 413 Weighted Rv(forest) 0.03 0.03 Weighted Rv(mmo) 0.03 Weighted polishes[) 01113 %Forest 92% 91% %Forest 80% %Forest 89% Managed Tuff Cover (acres) 0.20 0.20 Managed Tuff Cover (acres) 0.31 Managed Turf Cover (acres) 031 Weighted Rv(turf) 0.20 0.20 Weighted Rv(turt) 0.20 Weighted Rv (tuff) 0.20 %Managetl Tuff 4% 4% in Managed Turt 6% %Managed Tuff 7% Impervious cover (acres) 0.21 0.21 Impervious cover (acres) 072 Reoev. lmpernous Cover(a.) Oil Rv(impermus) 0.95 1 0.95 Rv(impervious) 0.95 M(impervious) 0.95 %Impervious 4% 5% 1 %Impervious 14% Total Site Area (acres) 5.16 4.65 FinaISRe Arealacred SAS Site AN, 0.07 0.08 Final Post Dew Site Rv 0.17 Treatment Volume and Nutrient Load Final Past- PreAeDevelopmentTreatment Volume 0.0318 0.0306 Development 0.0725 (acre-&) Treatment Volume (acre-&) Final Post - Pre Redevelopment Treatment Volume 1,387 1,331 Development 3,158 (cubic feet) Treatment Volume (cu ichet) FinalPost- Pre-ReDevelopennest TP Load 0.87 0.84 * Development TP Load 1.98 (Ib/y ) (lb/Yrl PreRelleuelognwn TP Load per acre Final Pon -Development TP pb/aone/yr) 0.17 0.10 * Lead per acre 0.39 (lb/ane/yQ Baseline TP Load (Ib/yr) (0A1 ladjave/yr applied to pre- redevelopment area excluding pervious 1.91 land proposed for new impervious cover) Adjusted Land Cover Summary: are ReDevelopereritIced cwermin. pervious land cover Oorest/0pen space or managed tui acreage propovajor new impervious corer. Adjusted fatal acreage is consistent with Post-ReDevelopment arreage (minus srerge n f new imperviouo cover). -owmn I shows mad reduction requriementf rnew imcervicus cover broad on new fevelopmentland limi4 0.4116s/acre/year). %Impervious 5% Tsbl ReOev.Sbe Area 4.65 (aces) ReDev SRe Rv 0.08 Treatment Volume and Nutrient Load i d Reduction Required (Ib/yr) -0.13 Nitrogen Loads (Informational Purposes Only) Port -Redevelopment Treatmem Volume 0A321 (aare-n) PastReDevelopment TreatmentVolume 1,399 (cubic feet) PastAeOereelopmem Lead(TP) om (Ibi Past-ermserioproB IF Toni (lb/arre/va Max. Reduction Focuied (Below Pre- 30% Redevelopment Load) TP Load Reduction Required for -1.03 Redeveloped Area (Ib/i Final Past-Develapment TN Load Pre-ReDevelopment TN Load(Ib/yr) 6.23 (Past-ReDevelopment&New 14.19 E Impervious) (Ib/yr) New Impervious Cover 0.51 (acres) Rv(impor ious) 0.95 Post -Development Treatment Volume (acrei Post-Develapmem Treatment Volume (cub feet) Portabvelopment TP Load lili TP Load Reduction Required for New 0.90 Virginia Runoff Reduction Method Wolksheet DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: SOUTH PANTOPS DRIVE PARCEL 20R Date: 44677 Total Rainfall (in): 43 Total Disturbed Acreage: 1.15 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) Atolls BSoils CSoils DSoils Totals %of Total Forest/Open (acres) 0.00 4.75 0.00 0.00 4.75 92 Managed Turf (acres) 0.00 0.20 0.00 0.00 0.20 4 Impervious Cover (acres) 0.00 0.21 0.00 0.00 0.21 4 5.16 100 Post-ReDevelopment Land Cover (acres) A soils BSoils CSoils DSoils Totals %of Total Forest/Open (acres) 0.00 4.13 0.00 0.00 4.13 80 Managed Turf (acres) 0.00 0.31 0.00 0.00 0.31 6 Impervious Cover (acres) 0.00 0.72 0.00 0.00 0.72 14 • Forest/Open Space areas must be protected in accordancewith the Virginia Runoff Reduction Method 5.16 100 Site Tv and Land Cover Nutrient Loads Final Post -Development post- Post Adjusted Pre- (Post-ReDevelopment ReDevelopment Development ReDevelopment & New Impervious) (New Impervious) Site Rv 0.17 0.08 0.95 0.08 Treatment Volume (ft) 3,158 1,399 1,759 1,331 TP Load (lb/yr) 1.98 0.88 1.11 0.84 Baseline TP Load(lb/yr): 1.9065' 'Reduction betnw new dewtopmentload limitation notrequired i7otal TP Load Reduction Required (lb/yr) i -0.13 i -1.03 i 0.90 i Final Post -Development Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment 7N Load (lb/yr) 14.19 6.23 Pre Final Post -Development Post-ReDevelopment TP ReDevelopment TP Load per acre TP Load per acre Load per acre (Ib/acre/yr) (lb/acre/yr) lb/acre/ 0.18 0.38 1 0.19 Summary Print Virginia Runoff Reduction Method Worksheet Site Compliance Summary Maximum % Reduction Required Below 10% = Note: % Reduction will reduce post -development TP load to less than or equal to baseline load of 1.91 Ib/yr (0.41 Ib/ac/yr) Pre-ReDevelopment Load [Required reductionfor Foss-ReDev.=Fost-ReDev. TP load- baseline load of1.9065 lb/yr], baseline load= site area x 0.41 lb/ac/yr Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (Ib/yr) 0.00 Remaining Post Development TP Load 1.98 (lb/yr) Remaining TP Load Reduction (lb/yr) Required D `Reduction below new development load limitation not required ** TARGET TP REDUCTION EXCEEDED BY 0.13 LB/YEAR ** Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area Summary DA A D.A. B DA C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary DA A D.A. B DA C D.A. D D.A. E Total TP Load Reduced (lb/yr) 1 0.00 1 0.00 1 0.00 0.00 0.00 0.00 TN Load Reduced (lb/yr) 1 0.00 1 0.00 1 0.00 0.00 1 0.00 0.00 Summary Prim Virginia Ruwg Reduction Method Worksheet Runoff Volume and CN Calculations 1-year storm 2-year storm 10-year storm Target Rainfall Event (in) 1 3.03 3.66 5.54 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN 0 0 0 0 0 RR (ft') 0 0 0 0 0 1-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR(ws-in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 2-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR (.in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 10-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR (.in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print SHIMP ENGINEERING, P.C. Design Focused Engineering Independent Reports: Excerpt from NRSC Soils Report NOAA Precipitation Report 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 11 MAP LEGEND Custom Soil Resource Report MAP INFORMATION imagery displayed on these maps. As a result, some minor shittinq of map unit boundaries may be evident. if'a 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 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres 142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. hftp://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=n res 142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/lnternet/FSE—DOCUMENTS/nrcsl42p2_052290.pdf 54 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