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WPO202200033 Calculations 2023-03-17
SHIMP ENGINEERING, P.C. Design Focused Engineering Stormwater Management Plan Calculation Packet Project Name: LOT A 13 BUNDORAN FARM. Prepared by: Shimp Engineering P.C. Date: July 08, 2021 Revised date: March 15, 2023 "IMP 9 tam 45183 31i5123 4A Table of Contents Cover Page Table of Contents Project Narrative Project Description SWM Quantity SWM Quality Level spreader Analysis: Post -Development Stormwater Level Spreader Drainage Area Map HydroCAD Analysis to the Level spreader. Time of concentration Ex Culvert and New. Time of Concentration_Calculation (LS & Ditch) Time of Concentration Nomographs Stormwater inlets and Pipes Analysis: VDOT Appendix C8-2 Ex —culvert Post -Development Stormwater Culverts Drainage Area Map Conveyance Channel Drainage area Summary Post -Development Conveyance Channel Drainage Area Map HY-8 Culvert Analysis VDOT LD-229 VDOT LD-268 Independent Reports: NRCS Soils Report NOAA Precipitation Report Appendix A: Rip -Rap Calculation SHIMP ENGINEERING, P.C. Design Focused Engineering February 06, 2022 Albemarle County Regarding: LOT A 13 BUNDORAN FARM Stormwater Management Plan Proiect Descrinkon The purpose of this project at Lot A 13 Bundoran Farm is to build a single-family residential house. All SWM calculations required are contained within the following report. The development property has an area of 52.74 acres and the development will disturb a total area of 3.10 acres. The proposed stormwater design meets water quantity requirements set forth in 9VAC25-870-66-D. SR'MQaantity The requirements for stormwater quantity are satisfied by the proposed stormwater design meets water quantity requirements set forth 9VAC25-870-66-D. Stormwater quantity is managed on site through the utilization of sheetflow where possible & by providing (5) Five level spreaders (LS) which will convert concentrated flow to sheetflow conditions. SHMQaality Quality requirements met via agreement in lieu of plan per Albemarle County WPO ordinance. SHIMP ENGINEERING, P.C. Design Focused Engineering Level spreader Analysis: Post -Development Stormwater Level Spreader Drainage Area Map HydroCAD Analysis to the Level spreader. Time of concentration _Ex Culvert and New. Time of Concentration Calculation (LS & Ditch) Time of Concentration Nomographs SHIMPENGINEERING, P. C. ENOJNEE 1,V6-LANDPGINMNO -PROJECT MANAM EH a o 1. z,00, s �� NE w43� 227 5- 4 F. o \� DA 1 Lot A 13 Bundoran Farm ND°RAN IROAD POST DEVELOPMENT DRAINAGE AREA OVERVIEW (Level Spreader) 0o POST DEV DA- IMPERV F--7- POST DEV DA- WOODS \i POST DEV DA - MEADOW ® POST DEV DA TURF DA (A) — DA (D) *4/ POST- TOC ---- LOD DA (B) — DA (E) Q o DA (C) Scale: 1 "= 40V Submission Date: -2022 Revision Date: 02-06202023 IIII I1111JJJfff///////// 111 /) It � �TREAM 0 `� •� p 1 X. ILDI G o .�•( 1 j iEX. 6U DIN _ It /I 1 1 , ail LS(q) A 1 aRoao E. ! WousE 1 LSfB ' i l � RC afiADC RCQ DA (D yy7� i �LPOS 1 � 5 1 I f , Analysis to Level Spreaders 1S 2S 3S 4S DA (A) DA (B) DI) DA (D) //1D KS POOL 1P One Percent 2D // BLS POOL 2P LS (B) LIP 2L One Percent Sub4 Reach 4on Llnk /3D KS POOL 3P // LS (C) L� 3L One Percent / 4D ,CS POOL 4P // LS (D) L� 4L One Percent POOL 6P One Percent Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2-2-2023 Prepared by {enter your company name here) Printed 2/7/2023 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.440 55 Woods, Good, HSG B (1S, 3S, 4S) 11.590 58 Meadow, non -grazed, HSG B (1S, 2S, 3S, 4S, 5S) 0.700 61 >75% Grass cover, Good, HSG B (1S, 2S, 3S) 0.640 98 Paved parking, HSG B (1S, 2S, 3S, 4S, 5S) 15.370 TOTAL AREA Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2-2-2023 Prepared by {enter your company name here) Printed 2/7/2023 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 15.370 HSG B 1S, 2S, 3S, 4S, 5S 0.000 HSG C 0.000 HSG D 0.000 Other 15.370 TOTAL AREA Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here} Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HydroCAD Software Solutions LLC Page 4 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Reach 1 D: LS POOL Avg. Flow Depth=0.05' Max Vet=0.24 fps Inflow=0.73 cfs 0.073 of n=0.025 L=10.0' S=0.0010'/' Capacity=122.93 cfs Outflow=0.70 cfs 0.073 of Link 1 L: One Percent Inflow=0.70 cfs 0.073 of Primary=0.70 cfs 0.073 of Pond 1 P: LS (A) LIP Peak EIev=1.02' Inflow=0.70 cfs 0.073 of Outflow=0.70 cfs 0.073 of Subcatchment 1 S: DA (A) Runoff Area=3.610 ac 2.22% Impervious Runoff Depth>0.24" Tc=13.5 min CN=58 Runoff=0.73 cfs 0.073 of Reach 2111): LS POOL Avg. Flow Depth=0.06' Max Vet=0.30 fps Inflow=1.19 cfs 0.081 of n=0.025 L=10.0' S=0.0010'/' Capacity=115.42 cfs Outflow=1.16 cfs 0.081 of Link 2L: One Percent Inflow=1.16 cfs 0.081 of Primary=1.16 cfs 0.081 of Pond 2P: LS (B) LIP Peak EIev=1.03' Inflow=1.16 cfs 0.081 of Outflow=1.16 cfs 0.081 of Subcatchment2S: DA (B) Runoff Area=2.470 ac 11.34% Impervious Runoff Depth>0.39" Tc=12.2 min CN=63 Runoff=1.19 cfs 0.081 of Reach 3111): LS POOL Avg. Flow Depth=0.05' Max Vet=0.24 fps Inflow=0.85 cfs 0.089 of n=0.025 L=10.0' S=0.0010'/' Capacity=143.60 cfs Outflow=0.83 cfs 0.089 of Link 3L: One Percent Inflow=0.83 cfs 0.089 of Primary=0.83 cfs 0.089 of Pond 3P: LS (C) LIP Peak EIev=1.03' Inflow=0.83 cfs 0.089 of Outflow=0.83 cfs 0.089 of Subcatchment3S: DA (C) Runoff Area=4.400 ac 2.50% Impervious Runoff Depth>0.24" Tc=14.5 min CN=58 Runoff=0.85 cfs 0.089 of Reach 4111): LS POOL Avg. Flow Depth=0.05' Max Vet=0.24 fps Inflow=0.53 cfs 0.063 of n=0.025 L=10.0' S=0.0010'/' Capacity=91.01 cfs Outflow=0.52 cfs 0.063 of Link 4L: One Percent Inflow=0.52 cfs 0.063 of Primary=0.52 cfs 0.063 of Pond 4P: LS (D) LIP Peak EIev=1.02' Inflow=0.52 cfs 0.063 of Outflow=0.52 cfs 0.063 of Subcatchment4S: DA (D) Runoff Area=3.130 ac 0.96% Impervious Runoff Depth>0.24" Tc=17.7 min CN=58 Runoff=0.53 cfs 0.063 of Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HVdroCAD Software Solutions LLC Paoe 5 Reach 51): LS POOL Avg. Flow Depth=0.06' Max Vet=0.28 fps Inflow=0.58 cfs 0.048 of n=0.025 L=10.0' S=0.0010'/' Capacity=68.49 cfs Outflow=0.56 cfs 0.048 of Link 5L: One Percent Inflow=0.56 cfs 0.048 of Primary=0.56 cfs 0.048 of Pond 5P: LS (E) LIP Peak Elev=1.03' Inflow=0.56 cfs 0.048 of Outflow=0.56 cfs 0.048 of Subcatchment5S: DA (E) Runoff Area=1.760 ac 7.95% Impervious Runoff Depth>0.33" Tc=14.6 min CN=61 Runoff=0.58 cfs 0.048 of Total Runoff Area = 15.370 ac Runoff Volume = 0.356 of Average Runoff Depth = 0.28" 95.84% Pervious = 14.730 ac 4.16% Impervious = 0.640 ac Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 1D: LS POOL Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.73 cfs @ 12.11 hrs, Volume= 0.073 of Outflow = 0.70 cfs @ 12.13 hrs, Volume= 0.073 af, Atten= 4%, Lag= 1.3 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.24 fps, Min. Travel Time= 0.7 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 1.5 min Peak Storage= 30 cf @ 12.12 hrs Average Depth at Peak Storage= 0.05' Bank -Full Depth= 1.00', Capacity at Bank -Full= 122.93 cfs 65.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 69.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 1 L: One Percent Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.70 cfs @ 12.13 hrs, Volume= 0.073 of Primary = 0.70 cfs @ 12.13 hrs, Volume= 0.073 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 1 P: LS (A) LIP Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.70 cfs @ 12.13 hrs, Volume= 0.073 of Outflow = 0.70 cfs @ 12.13 hrs, Volume= 0.073 af, Atten= 0%, Lag= 0.0 min Primary = 0.70 cfs @ 12.13 hrs, Volume= 0.073 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.02' @ 12.13 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 65.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=0.68 cfs @ 12.13 hrs HW=1.02' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 0.68 cfs @ 0.48 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 1S: DA (A) Runoff = 0.73 cfs @ 12.11 hrs, Volume= 0.073 af, Depth> 0.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Area (ac) CN Description 0.080 98 Paved parking, HSG B 0.060 61 >75% Grass cover, Good, HSG B 2.340 58 Meadow, non -grazed, HSG B 1.130 55 Woods. Good. HSG B 3.610 58 Weighted Average 3.530 97.78% Pervious Area 0.080 2.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 Direct Entry, TOC 1 Summary for Reach 2D: LS POOL Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 0.39" for 1-YR-24-HRS-Storm event Inflow = 1.19 cfs @ 12.07 hrs, Volume= 0.081 of Outflow = 1.16 cfs @ 12.09 hrs, Volume= 0.081 af, Atten= 3%, Lag= 1.1 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.30 fps, Min. Travel Time= 0.6 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 1.5 min Peak Storage= 39 cf @ 12.08 hrs Average Depth at Peak Storage= 0.06' Bank -Full Depth= 1.00', Capacity at Bank -Full= 115.42 cfs 61.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 65.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Link 2L: One Percent Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 0.39" for 1-YR-24-HRS-Storm event Inflow = 1.16 cfs @ 12.09 hrs, Volume= 0.081 of Primary = 1.16 cfs @ 12.09 hrs, Volume= 0.081 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 2P: LS (B) LIP Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 0.39" for 1-YR-24-HRS-Storm event Inflow = 1.16 cfs @ 12.09 hrs, Volume= 0.081 of Outflow = 1.16 cfs @ 12.09 hrs, Volume= 0.081 af, Atten= 0%, Lag= 0.0 min Primary = 1.16 cfs @ 12.09 hrs, Volume= 0.081 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.03' @ 12.09 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 61.0' long LS (A) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=1.13 cfs @ 12.09 hrs HW=1.03' (Free Discharge) t1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 1.13 cfs @ 0.58 fps) Summary for Subcatchment 2S: DA (B) Runoff = 1.19 cfs @ 12.07 hrs, Volume= 0.081 af, Depth> 0.39" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Area (ac) CN Description 0.280 98 Paved parking, HSG B 0.440 61 >75% Grass cover, Good, HSG B 1.750 58 Meadow, non -grazed, HSG B 0.000 55 Woods, Goad, HSG B 2.470 63 Weighted Average 2.190 88.66% Pervious Area 0.280 11.34% Impervious Area Tc Length Slope Velocity Capacity Description 12.2 Direct Entry, TOC 1 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 3D: LS POOL Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.85 cfs @ 12.12 hrs, Volume= 0.089 of Outflow = 0.83 cfs @ 12.15 hrs, Volume= 0.089 af, Atten= 3%, Lag= 1.5 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.24 fps, Min. Travel Time= 0.7 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 1.5 min Peak Storage= 35 cf @ 12.14 hrs Average Depth at Peak Storage= 0.05' Bank -Full Depth= 1.00', Capacity at Bank -Full= 143.60 cfs 76.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 80.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 3L: One Percent Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.83 cfs @ 12.15 hrs, Volume= 0.089 of Primary = 0.83 cfs @ 12.15 hrs, Volume= 0.089 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 3P: LS (C) LIP Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.83 cfs @ 12.15 hrs, Volume= 0.089 of Outflow = 0.83 cfs @ 12.15 hrs, Volume= 0.089 af, Atten= 0%, Lag= 0.0 min Primary = 0.83 cfs @ 12.15 hrs, Volume= 0.089 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.03' @ 12.15 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 46.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=0.82 cfs @ 12.15 hrs HW=1.03' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 0.82 cfs @ 0.58 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 3S: DA (C) Runoff = 0.85 cfs @ 12.12 hrs, Volume= 0.089 af, Depth> 0.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.200 61 >75% Grass cover, Good, HSG B 2.970 58 Meadow, non -grazed, HSG B 1.120 55 Woods. Good. HSG B 4.400 58 Weighted Average 4.290 97.50% Pervious Area 0.110 2.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.5 Direct Entry, TOC 1 Summary for Reach 4D: LS POOL Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.53 cfs @ 12.17 hrs, Volume= 0.063 of Outflow = 0.52 cfs @ 12.19 hrs, Volume= 0.063 af, Atten= 2%, Lag= 1.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.24 fps, Min. Travel Time= 0.7 min Avg. Velocity = 0.12 fps, Avg. Travel Time= 1.4 min Peak Storage= 22 cf @ 12.18 hrs Average Depth at Peak Storage= 0.05' Bank -Full Depth= 1.00', Capacity at Bank -Full= 91.01 cfs 48.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 52.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Link 4L: One Percent Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.52 cfs @ 12.19 hrs, Volume= 0.063 of Primary = 0.52 cfs @ 12.19 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 4P: LS (D) LIP Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 0.24" for 1-YR-24-HRS-Storm event Inflow = 0.52 cfs @ 12.19 hrs, Volume= 0.063 of Outflow = 0.52 cfs @ 12.19 hrs, Volume= 0.063 af, Atten= 0%, Lag= 0.0 min Primary = 0.52 cfs @ 12.19 hrs, Volume= 0.063 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.02' @ 12.19 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 49.0' long LS (B) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=0.51 cfs @ 12.19 hrs HW=1.02' (Free Discharge) t1=LS (B) Lip (6" X 6" Stacked Timber) (Weir Controls 0.51 cfs @ 0.48 fps) Summary for Subcatchment 4S: DA (D) Runoff = 0.53 cfs @ 12.17 hrs, Volume= 0.063 af, Depth> 0.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Area (ac) CN Description 0.030 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 2.910 58 Meadow, non -grazed, HSG B 0.190 55 Woods, Good, HSG B 3.130 58 Weighted Average 3.100 99.04% Pervious Area 0.030 0.96% Impervious Area Tc Length Slope Velocity Capacity Description 17.7 Direct Entry, TOC 4 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 5D: LS POOL Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 0.33" for 1-YR-24-HRS-Storm event Inflow = 0.58 cfs @ 12.11 hrs, Volume= 0.048 of Outflow = 0.56 cfs @ 12.13 hrs, Volume= 0.048 af, Atten= 3%, Lag= 1.0 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.28 fps, Min. Travel Time= 0.6 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 1.5 min Peak Storage= 21 cf @ 12.12 hrs Average Depth at Peak Storage= 0.06' Bank -Full Depth= 1.00', Capacity at Bank -Full= 68.49 cfs 36.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 40.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 5L: One Percent Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 0.33" for 1-YR-24-HRS-Storm event Inflow = 0.56 cfs @ 12.13 hrs, Volume= 0.048 of Primary = 0.56 cfs @ 12.13 hrs, Volume= 0.048 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 5P: LS (E) LIP Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 0.33" for 1-YR-24-HRS-Storm event Inflow = 0.56 cfs @ 12.13 hrs, Volume= 0.048 of Outflow = 0.56 cfs @ 12.13 hrs, Volume= 0.048 af, Atten= 0%, Lag= 0.0 min Primary = 0.56 cfs @ 12.13 hrs, Volume= 0.048 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.03' @ 12.13 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 36.0' long LS (C) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=0.55 cfs @ 12.13 hrs HW=1.03' (Free Discharge) L1=LS (C) Lip (6" X 6" Stacked Timber) (Weir Controls 0.55 cfs @ 0.55 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 2Type 11 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 5S: DA (E) Runoff = 0.58 cfs @ 12.11 hrs, Volume= 0.048 af, Depth> 0.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR-24-HRS-Storm Rainfall=3.06" Area (ac) CN Description 0.140 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 1.620 58 Meadow, non -grazed, HSG B 0.000 55 Woods. Good. HSG B 1.760 61 Weighted Average 1.620 92.05% Pervious Area 0.140 7.95% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.6 Direct Entry, TOC 5 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here} Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HydroCAD Software Solutions LLC Page 14 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Reach 1 D: LS POOL Avg. Flow Depth=0.18' Max Vet=0.58 fps Inflow=6.81 cfs 0.402 of n=0.025 L=10.0' S=0.0010'/' Capacity=122.93 cfs Outflow=6.71 cfs 0.402 of Link 1 L: One Percent Inflow=6.71 cfs 0.402 of Primary=6.71 cfs 0.402 of Pond 1 P: LS (A) LIP Peak EIev=1.10' Inflow=6.71 cfs 0.402 of Outflow=6.71 cfs 0.402 of Subcatchment 1 S: DA (A) Runoff Area=3.610 ac 2.22% Impervious Runoff Depth>1.34" Tc=13.5 min CN=58 Runoff=6.81 cfs 0.402 of Reach 2111): LS POOL Avg. Flow Depth=0.18' Max Vet=0.59 fps Inflow=6.42 cfs 0.350 of n=0.025 L=10.0' S=0.0010'/' Capacity=115.42 cfs Outflow=6.35 cfs 0.350 of Link 2L: One Percent Inflow=6.35 cfs 0.350 of Primary=6.35 cfs 0.350 of Pond 2P: LS (B) LIP Peak EIev=1.10' Inflow=6.35 cfs 0.350 of Outflow=6.35 cfs 0.350 of Subcatchment2S: DA (B) Runoff Area=2.470 ac 11.34% Impervious Runoff Depth>1.70" Tc=12.2 min CN=63 Runoff=6.42 cfs 0.350 of Reach 3111): LS POOL Avg. Flow Depth=0.18' Max Vet=0.59 fps Inflow=7.97 cfs 0.490 of n=0.025 L=10.0' S=0.0010'/' Capacity=143.60 cfs Outflow=7.92 cfs 0.489 of Link 3L: One Percent Inflow=7.92 cfs 0.489 of Primary=7.92 cfs 0.489 of Pond 3P: LS (C) LIP Peak EIev=1.14' Inflow=7.92 cfs 0.489 of Outflow=7.92 cfs 0.489 of Subcatchment3S: DA (C) Runoff Area=4.400 ac 2.50% Impervious Runoff Depth>1.34" Tc=14.5 min CN=58 Runoff=7.97 cfs 0.490 of Reach 4111): LS POOL Avg. Flow Depth=0.18' Max Vet=0.59 fps Inflow=5.09 cfs 0.348 of n=0.025 L=10.0' S=0.0010'/' Capacity=91.01 cfs Outflow=5.03 cfs 0.348 of Link 4L: One Percent Inflow=5.03 cfs 0.348 of Primary=5.03 cfs 0.348 of Pond 4P: LS (D) LIP Peak EIev=1.10' Inflow=5.03 cfs 0.348 of Outflow=5.03 cfs 0.348 of Subcatchment4S: DA (D) Runoff Area=3.130 ac 0.96% Impervious Runoff Depth>1.33" Tc=17.7 min CN=58 Runoff=5.09 cfs 0.348 of Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HVdroCAD Software Solutions LLC Paae 15 Reach 51): LS POOL Avg. Flow Depth=0.18' Max Vet=0.59 fps Inflow=3.77 cfs 0.227 of n=0.025 L=10.0' S=0.0010'/' Capacity=68.49 cfs Outflow=3.74 cfs 0.227 of Link 5L: One Percent Inflow=3.74 cfs 0.227 of Primary=3.74 cfs 0.227 of Pond 5P: LS (E) LIP Peak Elev=1.10' Inflow=3.74 cfs 0.227 of Outflow=3.74 cfs 0.227 of Subcatchment5S: DA (E) Runoff Area=1.760 ac 7.95% Impervious Runoff Depth>1.55" Tc=14.6 min CN=61 Runoff=3.77 cfs 0.227 of Total Runoff Area = 15.370 ac Runoff Volume = 1.818 of Average Runoff Depth = 1.42" 95.84% Pervious = 14.730 ac 4.16% Impervious = 0.640 ac Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 1D: LS POOL Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 1.34" for 10-YR-24-HRS-Storm event Inflow = 6.81 cfs @ 12.07 hrs, Volume= 0.402 of Outflow = 6.71 cfs @ 12.08 hrs, Volume= 0.402 af, Atten= 1 %, Lag= 0.5 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.58 fps, Min. Travel Time= 0.3 min Avg. Velocity = 0.19 fps, Avg. Travel Time= 0.9 min Peak Storage= 116 cf @ 12.07 hrs Average Depth at Peak Storage= 0.18' Bank -Full Depth= 1.00', Capacity at Bank -Full= 122.93 cfs 65.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 69.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 1 L: One Percent Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 1.34" for 10-YR-24-HRS-Storm event Inflow = 6.71 cfs @ 12.08 hrs, Volume= 0.402 of Primary = 6.71 cfs @ 12.08 hrs, Volume= 0.402 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 1 P: LS (A) LIP Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 1.34" for 10-YR-24-HRS-Storm event Inflow = 6.71 cfs @ 12.08 hrs, Volume= 0.402 of Outflow = 6.71 cfs @ 12.08 hrs, Volume= 0.402 af, Atten= 0%, Lag= 0.0 min Primary = 6.71 cfs @ 12.08 hrs, Volume= 0.402 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.10' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 65.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=6.56 cfs @ 12.08 hrs HW=1.10' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 6.56 cfs @ 1.03 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 1S: DA (A) Runoff = 6.81 cfs @ 12.07 hrs, Volume= 0.402 af, Depth> 1.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Area (ac) CN Description 0.080 98 Paved parking, HSG B 0.060 61 >75% Grass cover, Good, HSG B 2.340 58 Meadow, non -grazed, HSG B 1.130 55 Woods. Good. HSG B 3.610 58 Weighted Average 3.530 97.78% Pervious Area 0.080 2.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 Direct Entry, TOC 1 Summary for Reach 2D: LS POOL Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 1.70" for 10-YR-24-HRS-Storm event Inflow = 6.42 cfs @ 12.05 hrs, Volume= 0.350 of Outflow = 6.35 cfs @ 12.06 hrs, Volume= 0.350 af, Atten= 1 %, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.59 fps, Min. Travel Time= 0.3 min Avg. Velocity = 0.18 fps, Avg. Travel Time= 0.9 min Peak Storage= 109 cf @ 12.05 hrs Average Depth at Peak Storage= 0.18' Bank -Full Depth= 1.00', Capacity at Bank -Full= 115.42 cfs 61.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 65.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 HydroCAD@ 9.10 s/n 07054 @ 2010 HydroCAD Software Solutions LLC Page 18 Summary for Link 2L: One Percent Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 1.70" for 10-YR-24-HRS-Storm event Inflow = 6.35 cfs @ 12.06 hrs, Volume= 0.350 of Primary = 6.35 cfs @ 12.06 hrs, Volume= 0.350 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 2P: LS (B) LIP Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 1.70" for 10-YR-24-HRS-Storm event Inflow = 6.35 cfs @ 12.06 hrs, Volume= 0.350 of Outflow = 6.35 cfs @ 12.06 hrs, Volume= 0.350 af, Atten= 0%, Lag= 0.0 min Primary = 6.35 cfs @ 12.06 hrs, Volume= 0.350 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.10' @ 12.06 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 61.0' long LS (A) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=6.27 cfs @ 12.06 hrs HW=1.10' (Free Discharge) t1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 6.27 cfs @ 1.03 fps) Summary for Subcatchment 2S: DA (B) Runoff = 6.42 cfs @ 12.05 hrs, Volume= 0.350 af, Depth> 1.70" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Area (ac) CN Description 0.280 98 Paved parking, HSG B 0.440 61 >75% Grass cover, Good, HSG B 1.750 58 Meadow, non -grazed, HSG B 0.000 55 Woods, Goad, HSG B 2.470 63 Weighted Average 2.190 88.66% Pervious Area 0.280 11.34% Impervious Area Tc Length Slope Velocity Capacity Description 12.2 Direct Entry, TOC 1 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 3D: LS POOL Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 1.34" for 10-YR-24-HRS-Storm event Inflow = 7.97 cfs @ 12.08 hrs, Volume= 0.490 of Outflow = 7.92 cfs @ 12.09 hrs, Volume= 0.489 af, Atten= 1 %, Lag= 0.5 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.59 fps, Min. Travel Time= 0.3 min Avg. Velocity = 0.19 fps, Avg. Travel Time= 0.9 min Peak Storage= 135 cf @ 12.09 hrs Average Depth at Peak Storage= 0.18' Bank -Full Depth= 1.00', Capacity at Bank -Full= 143.60 cfs 76.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 80.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 3L: One Percent Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 1.33" for 10-YR-24-HRS-Storm event Inflow = 7.92 cfs @ 12.09 hrs, Volume= 0.489 of Primary = 7.92 cfs @ 12.09 hrs, Volume= 0.489 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 3P: LS (C) LIP Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 1.33" for 10-YR-24-HRS-Storm event Inflow = 7.92 cfs @ 12.09 hrs, Volume= 0.489 of Outflow = 7.92 cfs @ 12.09 hrs, Volume= 0.489 af, Atten= 0%, Lag= 0.0 min Primary = 7.92 cfs @ 12.09 hrs, Volume= 0.489 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.14' @ 12.09 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 46.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=7.80 cfs @ 12.09 hrs HW=1.14' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 7.80 cfs @ 1.22 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 3S: DA (C) Runoff = 7.97 cfs @ 12.08 hrs, Volume= 0.490 af, Depth> 1.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.200 61 >75% Grass cover, Good, HSG B 2.970 58 Meadow, non -grazed, HSG B 1.120 55 Woods. Good. HSG B 4.400 58 Weighted Average 4.290 97.50% Pervious Area 0.110 2.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.5 Direct Entry, TOC 1 Summary for Reach 4D: LS POOL Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 1.33" for 10-YR-24-HRS-Storm event Inflow = 5.09 cfs @ 12.12 hrs, Volume= 0.348 of Outflow = 5.03 cfs @ 12.13 hrs, Volume= 0.348 af, Atten= 1 %, Lag= 0.5 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.59 fps, Min. Travel Time= 0.3 min Avg. Velocity = 0.20 fps, Avg. Travel Time= 0.8 min Peak Storage= 86 cf @ 12.12 hrs Average Depth at Peak Storage= 0.18' Bank -Full Depth= 1.00', Capacity at Bank -Full= 91.01 cfs 48.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 52.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Link 4L: One Percent Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 1.33" for 10-YR-24-HRS-Storm event Inflow = 5.03 cfs @ 12.13 hrs, Volume= 0.348 of Primary = 5.03 cfs @ 12.13 hrs, Volume= 0.348 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 4P: LS (D) LIP Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 1.33" for 10-YR-24-HRS-Storm event Inflow = 5.03 cfs @ 12.13 hrs, Volume= 0.348 of Outflow = 5.03 cfs @ 12.13 hrs, Volume= 0.348 af, Atten= 0%, Lag= 0.0 min Primary = 5.03 cfs @ 12.13 hrs, Volume= 0.348 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.10' @ 12.13 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 49.0' long LS (B) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=4.96 cfs @ 12.13 hrs HW=1.10' (Free Discharge) t1=LS (B) Lip (6" X 6" Stacked Timber) (Weir Controls 4.96 cfs @ 1.03 fps) Summary for Subcatchment 4S: DA (D) Runoff = 5.09 cfs @ 12.12 hrs, Volume= 0.348 af, Depth> 1.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Area (ac) CN Description 0.030 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 2.910 58 Meadow, non -grazed, HSG B 0.190 55 Woods, Good, HSG B 3.130 58 Weighted Average 3.100 99.04% Pervious Area 0.030 0.96% Impervious Area Tc Length Slope Velocity Capacity Description 17.7 Direct Entry, TOC 4 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 5D: LS POOL Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 1.55" for 10-YR-24-HRS-Storm event Inflow = 3.77 cfs @ 12.08 hrs, Volume= 0.227 of Outflow = 3.74 cfs @ 12.09 hrs, Volume= 0.227 af, Atten= 1 %, Lag= 0.5 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.59 fps, Min. Travel Time= 0.3 min Avg. Velocity = 0.19 fps, Avg. Travel Time= 0.9 min Peak Storage= 64 cf @ 12.08 hrs Average Depth at Peak Storage= 0.18' Bank -Full Depth= 1.00', Capacity at Bank -Full= 68.49 cfs 36.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 40.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 5L: One Percent Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 1.55" for 10-YR-24-HRS-Storm event Inflow = 3.74 cfs @ 12.09 hrs, Volume= 0.227 of Primary = 3.74 cfs @ 12.09 hrs, Volume= 0.227 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 5P: LS (E) LIP Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 1.55" for 10-YR-24-HRS-Storm event Inflow = 3.74 cfs @ 12.09 hrs, Volume= 0.227 of Outflow = 3.74 cfs @ 12.09 hrs, Volume= 0.227 af, Atten= 0%, Lag= 0.0 min Primary = 3.74 cfs @ 12.09 hrs, Volume= 0.227 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.10' @ 12.09 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 36.0' long LS (C) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=3.68 cfs @ 12.09 hrs HW=1.10' (Free Discharge) L1=LS (C) Lip (6" X 6" Stacked Timber) (Weir Controls 3.68 cfs @ 1.03 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 5S: DA (E) Runoff = 3.77 cfs @ 12.08 hrs, Volume= 0.227 af, Depth> 1.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR-24-HRS-Storm Rainfall=5.58" Area (ac) CN Description 0.140 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 1.620 58 Meadow, non -grazed, HSG B 0.000 55 Woods. Good. HSG B 1.760 61 Weighted Average 1.620 92.05% Pervious Area 0.140 7.95% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.6 Direct Entry, TOC 5 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here} Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HydroCAD Software Solutions LLC Page 24 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Reach 1 D: LS POOL Avg. Flow Depth=0.23' Max Vet=0.71 fps Inflow=10.89 cfs 0.624 of n=0.025 L=10.0' S=0.0010'/' Capacity=122.93 cfs Outflow=10.79 cfs 0.623 of Link 1 L: One Percent Inflow=10.79 cfs 0.623 of Primary=10.79 cfs 0.623 of Pond 1 P: LS (A) LIP Peak Elev=1.14' Inflow=10.79 cfs 0.623 of Outflow=10.79 cfs 0.623 of Subcatchment 1 S: DA (A) Runoff Area=3.610 ac 2.22% Impervious Runoff Depth>2.07" Tc=13.5 min CN=58 Runoff=10.89 cfs 0.624 of Reach 2111): LS POOL Avg. Flow Depth=0.23' Max Vet=0.69 fps Inflow=9.62 cfs 0.521 of n=0.025 L=10.0' S=0.0010'/' Capacity=115.42 cfs Outflow=9.54 cfs 0.520 of Link 2L: One Percent Inflow=9.54 cfs 0.520 of Primary=9.54 cfs 0.520 of Pond 2P: LS (B) LIP Peak Elev=1.13' Inflow=9.54 cfs 0.520 of Outflow=9.54 cfs 0.520 of Subcatchment2S: DA (B) Runoff Area=2.470 ac 11.34% Impervious Runoff Depth>2.53" Tc=12.2 min CN=63 Runoff=9.62 cfs 0.521 of Reach 3111): LS POOL Avg. Flow Depth=0.23' Max Vet=0.71 fps Inflow=12.75 cfs 0.760 of n=0.025 L=10.0' S=0.0010'/' Capacity=143.60 cfs Outflow=12.68 cfs 0.759 of Link 3L: One Percent Inflow=12.68 cfs 0.759 of Primary=12.68 cfs 0.759 of Pond 3P: LS (C) LIP Peak Elev=1.19' Inflow=12.68 cfs 0.759 of Outflow=12.68 cfs 0.759 of Subcatchment3S: DA (C) Runoff Area=4.400 ac 2.50% Impervious Runoff Depth>2.07" Tc=14.5 min CN=58 Runoff=12.75 cfs 0.760 of Reach 4111): LS POOL Avg. Flow Depth=0.24' Max Vet=0.71 fps Inflow=8.19 cfs 0.540 of n=0.025 L=10.0' S=0.0010'/' Capacity=91.01 cfs Outflow=8.14 cfs 0.539 of Link 4L: One Percent Inflow=8.14 cfs 0.539 of Primary=8.14 cfs 0.539 of Pond 4P: LS (D) LIP Peak Elev=1.14' Inflow=8.14 cfs 0.539 of Outflow=8.14 cfs 0.539 of Subcatchment4S: DA (D) Runoff Area=3.130 ac 0.96% Impervious Runoff Depth>2.07" Tc=17.7 min CN=58 Runoff=8.19 cfs 0.540 of Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 HydroCAD® 9.10 s/n 07054 ©2010 HVdroCAD Software Solutions LLC Paae 25 Reach 51): LS POOL Avg. Flow Depth=0.23' Max Vet=0.69 fps Inflow=5.81 cfs 0.344 of n=0.025 L=10.0' S=0.0010'/' Capacity=68.49 cfs Outflow=5.77 cfs 0.343 of Link 5L: One Percent Inflow=5.77 cfs 0.343 of Primary=5.77 cfs 0.343 of Pond 5P: LS (E) LIP Peak Elev=1.13' Inflow=5.77 cfs 0.343 of Outflow=5.77 cfs 0.343 of Subcatchment5S: DA (E) Runoff Area=1.760 ac 7.95% Impervious Runoff Depth>2.34" Tc=14.6 min CN=61 Runoff=5.81 cfs 0.344 of Total Runoff Area = 15.370 ac Runoff Volume = 2.787 of Average Runoff Depth = 2.18" 95.84% Pervious = 14.730 ac 4.16% Impervious = 0.640 ac Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 1D: LS POOL Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 10.89 cfs @ 12.06 hrs, Volume= 0.624 of Outflow = 10.79 cfs @ 12.07 hrs, Volume= 0.623 af, Atten= 1 %, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.71 fps, Min. Travel Time= 0.2 min Avg. Velocity = 0.21 fps, Avg. Travel Time= 0.8 min Peak Storage= 153 cf @ 12.07 hrs Average Depth at Peak Storage= 0.23' Bank -Full Depth= 1.00', Capacity at Bank -Full= 122.93 cfs 65.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 69.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 1 L: One Percent Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 10.79 cfs @ 12.07 hrs, Volume= 0.623 of Primary = 10.79 cfs @ 12.07 hrs, Volume= 0.623 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 1 P: LS (A) LIP Inflow Area = 3.610 ac, 2.22% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 10.79 cfs @ 12.07 hrs, Volume= 0.623 of Outflow = 10.79 cfs @ 12.07 hrs, Volume= 0.623 af, Atten= 0%, Lag= 0.0 min Primary = 10.79 cfs @ 12.07 hrs, Volume= 0.623 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.14' @ 12.07 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 65.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=10.53 cfs @ 12.07 hrs HW=1.13' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 10.53 cfs @ 1.20 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 1S: DA (A) Runoff = 10.89 cfs @ 12.06 hrs, Volume= 0.624 af, Depth> 2.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-YR-24-HRS-Storm Rainfall=6.84" Area (ac) CN Description 0.080 98 Paved parking, HSG B 0.060 61 >75% Grass cover, Good, HSG B 2.340 58 Meadow, non -grazed, HSG B 1.130 55 Woods. Good. HSG B 3.610 58 Weighted Average 3.530 97.78% Pervious Area 0.080 2.22% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.5 Direct Entry, TOC 1 Summary for Reach 2D: LS POOL Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 2.53" for 25-YR-24-HRS-Storm event Inflow = 9.62 cfs @ 12.05 hrs, Volume= 0.521 of Outflow = 9.54 cfs @ 12.05 hrs, Volume= 0.520 af, Atten= 1 %, Lag= 0.3 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.69 fps, Min. Travel Time= 0.2 min Avg. Velocity = 0.19 fps, Avg. Travel Time= 0.9 min Peak Storage= 139 cf @ 12.05 hrs Average Depth at Peak Storage= 0.23' Bank -Full Depth= 1.00', Capacity at Bank -Full= 115.42 cfs 61.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 65.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Link 2L: One Percent Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 2.53" for 25-YR-24-HRS-Storm event Inflow = 9.54 cfs @ 12.05 hrs, Volume= 0.520 of Primary = 9.54 cfs @ 12.05 hrs, Volume= 0.520 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 2P: LS (B) LIP Inflow Area = 2.470 ac, 11.34% Impervious, Inflow Depth > 2.53" for 25-YR-24-HRS-Storm event Inflow = 9.54 cfs @ 12.05 hrs, Volume= 0.520 of Outflow = 9.54 cfs @ 12.05 hrs, Volume= 0.520 af, Atten= 0%, Lag= 0.0 min Primary = 9.54 cfs @ 12.05 hrs, Volume= 0.520 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.13' @ 12.05 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 61.0' long LS (A) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=9.50 cfs @ 12.05 hrs HW=1.13' (Free Discharge) t1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 9.50 cfs @ 1.19 fps) Summary for Subcatchment 2S: DA (B) Runoff = 9.62 cfs @ 12.05 hrs, Volume= 0.521 af, Depth> 2.53" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-YR-24-HRS-Storm Rainfall=6.84" Area (ac) CN Description 0.280 98 Paved parking, HSG B 0.440 61 >75% Grass cover, Good, HSG B 1.750 58 Meadow, non -grazed, HSG B 0.000 55 Woods, Good, HSG B 2.470 63 Weighted Average 2.190 88.66% Pervious Area 0.280 11.34% Impervious Area Tc Length Slope Velocity Capacity Description 12.2 Direct Entry, TOC 1 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 3D: LS POOL Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 12.75 cfs @ 12.08 hrs, Volume= 0.760 of Outflow = 12.68 cfs @ 12.08 hrs, Volume= 0.759 af, Atten= 1 %, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.71 fps, Min. Travel Time= 0.2 min Avg. Velocity = 0.22 fps, Avg. Travel Time= 0.8 min Peak Storage= 179 cf @ 12.08 hrs Average Depth at Peak Storage= 0.23' Bank -Full Depth= 1.00', Capacity at Bank -Full= 143.60 cfs 76.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 80.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 3L: One Percent Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 12.68 cfs @ 12.08 hrs, Volume= 0.759 of Primary = 12.68 cfs @ 12.08 hrs, Volume= 0.759 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 3P: LS (C) LIP Inflow Area = 4.400 ac, 2.50% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 12.68 cfs @ 12.08 hrs, Volume= 0.759 of Outflow = 12.68 cfs @ 12.08 hrs, Volume= 0.759 af, Atten= 0%, Lag= 0.0 min Primary = 12.68 cfs @ 12.08 hrs, Volume= 0.759 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.19' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 46.0' long LS (A) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=12.44 cfs @ 12.08 hrs HW=1.19' (Free Discharge) L1=LS (A) Lip (6" X 6" Stacked Timber) (Weir Controls 12.44 cfs @ 1.43 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 3S: DA (C) Runoff = 12.75 cfs @ 12.08 hrs, Volume= 0.760 af, Depth> 2.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-YR-24-HRS-Storm Rainfall=6.84" Area (ac) CN Description 0.110 98 Paved parking, HSG B 0.200 61 >75% Grass cover, Good, HSG B 2.970 58 Meadow, non -grazed, HSG B 1.120 55 Woods. Good. HSG B 4.400 58 Weighted Average 4.290 97.50% Pervious Area 0.110 2.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.5 Direct Entry, TOC 1 Summary for Reach 4D: LS POOL Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 8.19 cfs @ 12.11 hrs, Volume= 0.540 of Outflow = 8.14 cfs @ 12.12 hrs, Volume= 0.539 af, Atten= 1 %, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.71 fps, Min. Travel Time= 0.2 min Avg. Velocity = 0.23 fps, Avg. Travel Time= 0.7 min Peak Storage= 115 cf @ 12.12 hrs Average Depth at Peak Storage= 0.24' Bank -Full Depth= 1.00', Capacity at Bank -Full= 91.01 cfs 48.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 52.00' Length= 10.0' Slope= 0.0010 T Inlet Invert= 0.00', Outlet Invert= -0.01' Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Link 4L: One Percent Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 8.14 cfs @ 12.12 hrs, Volume= 0.539 of Primary = 8.14 cfs @ 12.12 hrs, Volume= 0.539 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 4P: LS (D) LIP Inflow Area = 3.130 ac, 0.96% Impervious, Inflow Depth > 2.07" for 25-YR-24-HRS-Storm event Inflow = 8.14 cfs @ 12.12 hrs, Volume= 0.539 of Outflow = 8.14 cfs @ 12.12 hrs, Volume= 0.539 af, Atten= 0%, Lag= 0.0 min Primary = 8.14 cfs @ 12.12 hrs, Volume= 0.539 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.14' @ 12.12 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 49.0' long LS (B) Lip (6" X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=8.00 cfs @ 12.12 hrs HW=1.14' (Free Discharge) t1=LS (B) Lip (6" X 6" Stacked Timber) (Weir Controls 8.00 cfs @ 1.20 fps) Summary for Subcatchment 4S: DA (D) Runoff = 8.19 cfs @ 12.11 hrs, Volume= 0.540 af, Depth> 2.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-YR-24-HRS-Storm Rainfall=6.84" Area (ac) CN Description 0.030 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 2.910 58 Meadow, non -grazed, HSG B 0.190 55 Woods, Good, HSG B 3.130 58 Weighted Average 3.100 99.04% Pervious Area 0.030 0.96% Impervious Area Tc Length Slope Velocity Capacity Description 17.7 Direct Entry, TOC 4 Post -LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Reach 5D: LS POOL Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 2.34" for 25-YR-24-HRS-Storm event Inflow = 5.81 cfs @ 12.07 hrs, Volume= 0.344 of Outflow = 5.77 cfs @ 12.08 hrs, Volume= 0.343 af, Atten= 1 %, Lag= 0.4 min Routing by Stor-Ind+Trans method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 0.69 fps, Min. Travel Time= 0.2 min Avg. Velocity = 0.21 fps, Avg. Travel Time= 0.8 min Peak Storage= 83 cf @ 12.08 hrs Average Depth at Peak Storage= 0.23' Bank -Full Depth= 1.00', Capacity at Bank -Full= 68.49 cfs 36.00' x 1.00' deep channel, n= 0.025 Rubble masonry, cemented Side Slope Z-value= 2.0 T Top Width= 40.00' Length= 10.0' Slope= 0.0010'/' Inlet Invert= 0.00', Outlet Invert= -0.01' Summary for Link 5L: One Percent Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 2.34" for 25-YR-24-HRS-Storm event Inflow = 5.77 cfs @ 12.08 hrs, Volume= 0.343 of Primary = 5.77 cfs @ 12.08 hrs, Volume= 0.343 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Pond 5P: LS (E) LIP Inflow Area = 1.760 ac, 7.95% Impervious, Inflow Depth > 2.34" for 25-YR-24-HRS-Storm event Inflow = 5.77 cfs @ 12.08 hrs, Volume= 0.343 of Outflow = 5.77 cfs @ 12.08 hrs, Volume= 0.343 af, Atten= 0%, Lag= 0.0 min Primary = 5.77 cfs @ 12.08 hrs, Volume= 0.343 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 1.13' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 1.00' 36.0' long LS (C) Lip IV X 6" Stacked Timber) 2 End Contraction(s) Primary OutFlow Max=5.66 cfs @ 12.08 hrs HW=1.13' (Free Discharge) L1=LS (C) Lip (6" X 6" Stacked Timber) (Weir Controls 5.66 cfs @ 1.19 fps) Post —LEVEL SPREADERS Drainage Areas LEVEL SPREADERS - Bundora Lot A-13 Type 11 24-hr25-YR-24-HRS-Storm Rainfall=6.84" Prepared by {enter your company name here) Printed 2/7/2023 Summary for Subcatchment 5S: DA (E) Runoff = 5.81 cfs @ 12.07 hrs, Volume= 0.344 af, Depth> 2.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-YR-24-HRS-Storm Rainfall=6.84" Area (ac) CN Description 0.140 98 Paved parking, HSG B 0.000 61 >75% Grass cover, Good, HSG B 1.620 58 Meadow, non -grazed, HSG B 0.000 55 Woods. Good. HSG B 1.760 61 Weighted Average 1.620 92.05% Pervious Area 0.140 7.95% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.6 Direct Entry, TOC 5 LOT A -13 BUNDORAN FARM Time of Concentration Calculations PRE _ DEV TOC 100 ft verland Flo 3.00% slope 0 C-value 13.10 min Seelye Chart 1214.75 ft S.C. Flow 28.6% slope 1.3 fps velocity 15.6 min. NEH Figure 15-4 3270.0 ft Channel 84.0 ft height 16.2 min. Kirpich Chart TOC= 44.87 min. FOREST - Seelye Chart ( Nomographs) 1 0.25 LOT A -13 BUNDORAN FARM Time of Concentration Calculations POST _ DEV TOC 100 ft verland Flo 3.00% slope 0 C-value 13.10 min Seelye Chart 1214.75 ft S.C. Flow 28.6% slope 1.3 fps velocity 15.6 min. NEH Figure 15-4 3270.0 ft Channel 84.0 ft height 16.2 min. Kirpich Chart TOC= 44.87 min. FOREST - Seelye Chart ( Nomographs ) 1 0.25 LOT A -13 BUNDORAN FARM Time of Concentration Calculations POST _ DEV TOC 100 ft Overland Flow 9.50% slope 0.28 C-value 9.8 min Seelye Chart 389.00ft S.C. Flow 14.0% slope 2.6 fps velocity 2.5 min. NEH Figure 15-4 451.0 ft Channel 56.5 ft height 1.9 min. Kirpich Chart min. LOT A -13 BUNDORAN FARM Time of Concentration Calculations POST DEV TOC 100 ft Overland Flow 7.1% slope 0.28 C-value 10.5 min Seelye Chart 468.0 ft S.C. Flow 10.7% slope 2.25 fps velocity 3.5 min. NEH Figure 15-4 215.0 ft Channel 13.2 ft height 1.5 min. Kirpich Chart TOC= ISM min. LOT A -13 BUNDORAN FARM 100 ft Overland Flow 6.5% slope 0.28 C-value 30.7 min Seelye Chart 540.0 ft S.C. Flow 10.2% slope 2.20 fps velocity 4.1 min. NEH Figure 15-4 276A ft Channel 15.2 ft height 1.8 min. Kirpich Chart TOC= 16.54 min. LOT A -13 BUNDORAN FARM POST DEV TOC 100 ft Overland Flow 7.5% slope 0.28 C-value 10.5 min Seelye Chart 437.0 ft S.C. Flow 14.7% slope 2.60 fps velocity 2.8 min. NEH Figure 15-4 210.0 ft Channel 10.3 ft height 1.3 min. Kirpich Chart min. LOT A -13 BUNDORAN FARM POST DEV TOC 100 ft Overland Flow 0.8% slope 0.28 C-value 16.0 min Seelye Chart 247.0 ft S.C. Flow 13.4% slope 2.52 fps velocity 1.6 min. NEH Figure 15-4 200.0ft Channel 26.0ft height 1.0 min. Kirpich Chart min. LOT A 13 BUNDORAN FARM PRE & POST DEV TOC NOMOGRAPHS EX CULVERT, LEVEL SPREADERS & DITCH Appendix 60-1 Overland Flow Time - Seelye Td=0.225 Lo,a So. to C T.- C.vwM R. Tmi., mnW{ L -wgln 0 SWP. N.1 35 - 9•°IaVt c = m T-ti� vau,. a, cmu.a cr.vacl« R9m SCO 30 500 Peved 0. 9.8 10.5 400 min min 0.: TOC-POS TOC-POST,5 0.7 300 0.6 q Soil 0.5 20 w S 2� \\\ _ 2 Poor 0.4 i 13.10 mi z LL 1 r899 r TOC-PRE �s 0.5 'c' F AVerade 0.3 10 _ i a A o 0 90 \ 2,0 vJi 90 Deana, 70 0.2,\\ ii w 10 * O 50 20 �. } w 40 10.5 min to 30 u LLo u TOC-POST 9 = 16.0 min - 0 OC-POST B ZD V BPllvq� 'C' V.I.. Iv LIK't.0 OrpIM C�..— O. t> T doge �oaa aF x. LOTo — cr oLI—Sur+oce 0.. 40 l. 0.8 _ 0 &r.P.tVSan .c. Po..a 0.90 OVERLAND FLOW TIME REPRINTED WITH PERMISSION FROM 'DATA BOOK FOR CIVIL ENGINEERS' VOL.. I - DESIGN 2nd EDITION 119511 BY E. E. %ELYE TOC—Pre TOC Post—DA (A) TOC Post—DA B — 0A — TOC Post—DA C — DA — TOC Post—DA D TOC Post—DA (E) 1. ,,, „ Illlllllii� MMMSMOMSM0 �■ ala�a�����/aaa11nm1 ....-...Ir ...IJI...1.�—I 1111, a�a������aO11111111 a�1���1lal�a1r11.[.1111111/m ��������OOOIIII� ��■�����F�■�lG�ll�� �■■■■11111111111 MONINIIIIIIIIIL1741 I/ 1 ;VAN I■/II%��Illlill�i�■ IIIALAII�■ a, ,6 NLoi , 0�r.'17,III IID!IIIIII�� li� -ate2 ..11 ar, r ... —______..:::::: .' Iaa111 �1111 /lll innn r1 � AI / __ i,^. /' � " .'/ / 1! _ .ri.ionnm� _._..1:::::—_I �����.. �Y I I i��Ia11111111 I��1111111111�� �onunnlllll�� 1a1�11111111�� aka■■_�_■� Ia1111 /III 111114 I�Ia11111111a�a� ��■■■ =■■■ ■ : ,/1111111111111�■ M■■ MEII_111;,11111111. 1111111111111110■ 11111111111111■■� _I ■■■■:%'e2Fe2€,E5:a3E :■152e222EE2E�E�■'�J .nWMW 1.IL.L..L .1� ������.i.vs.rnnm�i M'- .ronu.m..%C .I l.�lololonnmlllll�lll.� 0.050 Nearly mere and unfilled (�erluud flow); and allurial furs in western mountain 0.2 0.051 V--9.965(sy- regions Minimum til[W mItivation. Contour or strip cropped end woodlands 0.2 0,101 V-5.032(SY- 1992 TRAVEL TIME FOR CHANNEL FLOW (Rirpich Chart) H (feet) 1.9 min 1.48 min 1.30 min 500 TOC-POS TOC-POST TOC-POST Tc (min.) 1.01 min 200 roc -POST 100 100 L (feet) 10000 fxeyMie 50 f ` a� 'e 0 5000 4 Note: 6.20 min d_ (1) For use wi natural channels; TOC-PRE (2) .r paved channe w(Yi PIY 1 d Tt'Ei 0.2 E 1000 2 10 £ 5 500 5 A �D ` IOO y t 1 TIME OF CONCENTRATION OF SMALL DRAINAGE BASINS Source: VDOT Plate 5-3 V-13 SHIMPENGINEERING, P.C. EN6/NEERING-L4ADPL4N1qNG-PRNELT MANAGEMENT e: <.3.) z SHIMP ENGINEERING, P.C. Design Focused Engineering Stormwater inlets and Pipes Analysis: VDOT Appendix C8-2 Ex —culvert Post -Development Stormwater Culverts Drainage Area Map Conveyance Channel Drainage area Summary Post -Development Conveyance Channel Drainage Area Map f Y-8 Culvert Analysis VDOT LD-229 VDOT LD-268 LOT A -13 BUNDORAN FARM Conveyence Channels & Culverts Drainage Area Summary Impervious C 10.9 Pervious C 10.1 Str. Type Str. No. Total Area (ft) Imp. (ft) Meadow (ft) C Area (ac) EX. Culvert 48" HDPE PIPE 1 11,539,875 256,991 11,282,885 0.29 264.92 EX. 48" HDPE CULVERT CALCULATIONS A= 264.92 AC C= (PIMP* D.9+ATURF* 0.3) /ATOTAL C=0.29 TOC=44.87 MINUTES alo=161.60 (Regression Constants) blo=18.73 (Regression Constants) I=a10/(TOC+b10) 1=2.54 IN/HR Q10=197.76 CFS (RATIONAL METHOD) FOR DUAL CULVERTS, IT IS ASSUMED THAT THE PEAK FLOW RATE IS SPLIT PER NUMBER OF CULVERTS (2) 48" Culvert: HW6=1.23 DPIPE=48"=4.0' HW="/D *DPIPE HW=1.23*4.0 = 4.92' Calculation for overtopping: HW + Invert In 4.92 + 705.8 = 710.72 Min. Driveway Elevation at crossing = 711.2 No overtopping computed LOT A 13 BUNDORAN FARM CULVERTS CALCULATIONS APPENDIX 8C-2 Chapter 8 - Culverts Appendix 8C-1 Inlet Control, Circular Concrete ISO 10,000 CHART 10 lee 6,000 EXAMPLE (I) (2) (3) 156 6 000 D•42 lacbew 133 real 6. ,000 D•120 eh 194 55. 4,000 xHf1�T s 6• 5. 132 3 1,10 4. Ito 3•� a) 2.5 4.0 5' a. o00 (2) 2.1 T.4 z 100 131 E.2 TJ 9. 3. AD I. reel 3• 96 1.000 3. S00 64 600 / .12. 500 /� 72 400 / e Y. In �r 3 ISO 300 E4� / s. 1.51.5 = N V$ = 60 p 200 / F 1.5 2 W 54 ~ CULVERTS / a 60 (2) 4QIP D/2 9 CFS z U 4P V BO W 1.0 I.0 O c 50 HW SCALE ENTRANCE a 10 40 D TYPE W ► 36 30 In sa+ere Mp .Hn ; .B '9 •9 W 33 a 20 10 Dr-- led.Itn 30 nea$wu i .6 .6 13) 6re-e el. •6 Y7 f"ge.l.B 0 24 S 7 7 T 6 Te ew teal$ (2) e" (3) Pellet P 1 5 narl.eetallT to ,eel$ 10,1MA 4 eu el"aieM Iaella•a Il.e DR-1B D and 9 teal.,•....... a, .8 3 III+."area. 6 .B )e 2 15 3 1.5 I.0 .S 19 HEADWATER DEPTH FOR HEADWATER SCALES 253 CONCRETE PIPE CULVERTS BUREAU Elf Wwc FGAD$ JAM. IYo REVISED MAY 1964 WITH INLET CONTROL Source: HDS -5 1 of 1 VDOT Drainage Manual DATE: 8 JULY 2022 SHIMPPNGINEERING, P. C. ENGINEERING-L4AVPLANNLYG-PROIEC'T MANAGEMENT (...) : ;� , ` \ `� '♦ SHIMPEATONEERI C Legend Culvert DA �}}' \ \} } \\ `O%NG- 4AOP/NG-PROJ�T,� ' %♦} �\ i 1 I; I\ \ \ \19 ow.aa = LLE. .=o= �.\ \• °o POST DEV DA- IMPERV POST DEV DA-WOODS --- \I ' } 1' 1 ' , I ` \ •moo ♦ ®'_ _,�. X1CX s. =aowaw wa'N�rt'~ PoM POST DEV DA - MEADOW ® POST DEV DA TURF \ '' ' \ eo \\ \ �♦ o♦♦ \ ` ass \\� y y♦ �' \ i r/��♦_� -----' Culvetl Al-A2 \} ` , ,t 1 11 I - 1\ ♦ o` �'. ♦♦ ��YYy��.mr�� �r `ao� \♦ !! 1 �♦ r i Scale: V: 100•' y'. ♦ / lfJ,,i/ Submission Date: 07-08-2022 t. \„•�,`''•:t. 1 �� 1 -\ \ -;'\ ♦ 1 l�•.a�.....^.....';;:I:.....;r;l;':i:: is .9::f. y :'/�':.;'.': _J ;I 86 _43 - _�------� '\ } t �"E - ✓'; -1 r �, I ea �1 t': lr::�;'.�:. O O I ; LT /" `` ♦,®,}} \ t♦ at --. % /� / `.b?.. :°Rq'Rn'`C',.G"'.��..."i !WL: KISIIERMAN -D n, --^� 1 ' i�, } ,1 �} r/ t` ,%� C.;:: Jr:( .. i ' l l 1 • ;: i 1 1 f:.�:: nn } } { � ENE (STONE,_^•\1!�l' '('"� :,')�r,:''!'"•. �'''� /� 1 DiB; s�, w Gr-36 \- - % % f i 1DIB.1 406 b.G4 . r 1 i ' �\ v �f� t'' �! ' i .^ � 1�'' �f ( �� � � . o�� 600 `' �l , '1 ♦ �\ }\ }\ r"- � -- � / J 1 - i S \ 1 i 1 oc 1� I Vtltl, •. � I Thy ' \ ~ � � � 's� \`� `✓ '� / 1 \ \\ \ .} ^\ \} ? "�,/ ---�/% _ ; -♦Ir �I I t�.li.. .L .I Ir:�:.._ tea! ♦: \. '.. \l ��,m�� \ �\ I % 1\} `� \��\. } !^---, YYi/ J ✓r - -- I'I i FENCII•y.�T-':.r-•-'\ ,,o ` \.� �` �� \ -1 j I,P �� .� ___ �-___` /; ' Z ' 11 `} ,� 11\ � i i � ` � } � ; 11i' i I ',� I 1\ ({/�d`♦` \ � � � ,! � l j �', `� / J _�-----�`_---- _—____-""//. '4�/ ! /, _- � �'�°r `j � { ' < �I � I � 1t I . • j ', � j ../.:./�,/� 6 �..., ;' / ., y i� r � JJ J r 4, j 1 a —: j /ice � —.��\� 'a � -, % \ J I 1 \ •� r1 I> I �,' { .'� :,..L.., �.. 7 i , � � � t7! I / , r� o ,'• /, ow g3 /� / —_ W ODS /Ii < ♦ \ l 1 !`r /A1 ! / AN _ - �' c"� yV ♦ ,\) ' 1 i 1 Q` 1 j shoo} -_ - ♦��_:� a > / ♦♦\ / \�I `POA FENI E 7> � IAx. wiY�A7 j, .If �t,'1 1 1 Ii PIPE II ', 1 � t { r i f i' l 1 % , I- ���! ry V11 0l S'�� 11 �1 i j�/ i T.M. 18q- I LOTI,A-A, N2.* ' PAUL\ TF D�jF,TI $A PQ 9 rG 16A PA 5 L I_\-1 l/_9:L7 Lot A 13 Bundoran Farm LOT A -13 BUNDORAN FARM Conve ence Channels & Culverts Drainage Area Summary Impervious C 10.9 Pervious C 10.3 Str. Type Str. No. Total Area (ft) Imp. (ft) Meadow (ft) C Area (ac) 6' Conveyance Channel 1 1 156,950 3,316 101,794 0.29 3.60 6' Conveyance Channel 2 2 102,913 11,796 72,058 0.35 2.36 6' Conveyance Channel 3 3 4,707 587 4,116 0.36 0.11 6' Conve ance Channel 4 4 186,712 3,902 125,188 0.29 4.29 6' Conveyance Channel 5 5 5,008 834.00 4,174 0.38 0.11 6' Conveyance Channel 6 6 136,233 1,410 126,600 0.29 3.13 6' Conveyance Channel 7 7 76,481 5,959 70,522 0.33 1.76 SHIMPENGINMING, P.C. I \ W \\ \ ENGINEERING.LANDPUNNING-PRafELTMANACEMENT __� ewwncor2aNuc.r vw 2avoi .IuanHsawlup- lae.coln Z/ ' ---- l 1 / � DTH tl W t ! r lSPREARER A ,REAM /lp1 jY' y Y •\ 1 \\ \\II 11 1 i" s / \s Y\ � I i `q ll(/ i ., v Y17 j IA1-'8l1 1 � \1I.A% Lot A 13 Bundoran Farm 'epgEAEUN j (' Legend Ditch DA v JJ fA 1` I 1 1 J" 9 1• II I I � 1 — \ 1 a I \ ' :::..vx •:fi:.."".c:.':(v:.':(c: �':c:::n: tic: _•:a :::::.'::.':::� �>'', i :� :::1,:,:'r�: '.� `. !.. w. � \\ �\ $o POST DEV DA - IMPERV POST DEV DA -WOODS ':i ::xJ::::i:::ii::i:i:: ;::•':i::•':i:E:ii:•':iiE :i� ::� .::: , :�:. :. .:: 1 `I 11 ; ----- _ __ L I, -- —__ :::: POST DEV DA -MEADOW v E+ of o � i � \ , 1 \�- ® POST DEV DA TURF :::fur:::if: if:'�f:'�f f:'�::fi'�:ifi��:i �.•ii'!,.� 1,'�!'.i f 1 � 1 1 1 DA DA A w DA(D) 1 1 I 1 1 1 i \ \ I 1 / ;! •.j,.;:'�:i" / 1 I 1 1 / , `\ — DA — DA (B) — DA — DA (E) 1 . }!.• is iii' / I I I , I .� IN "-'•- '_. — a• — DA (C) POST- TOC LOD 150 0 150 300 450 Submission Dale: 07-08-2022 // r I 1hil {fI Scale: 1"=150' 711 71 710.0 709.0 = 708.5 c 0 708.0 0 w 707.5 707.0 705.5 Crossing - EX. 48 Inches HDPE PIPE, Design Discharge - 182.0 cfs Culvert - Culvert 1, Culvert Discharge - 182.0 cfs -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 Station (ft) Crossing Data -EX. 48Inches HDPE PIPE Crossing Properties Name: a . - 0 DMID"ARGE DATA Discharge Method 0.000 Minimum Flow Design Floaa 181.960 Maximum Flo -A, 181.960 id TAILWATER DATA Channel Type Trapezoi Bottom Width 3.700 Side Slope (H:V) 2.000 Channel Slope 0.0115 0.040 Manning's n (channel) Channel Invert Elevation 705.100 Rating Curve Constan 0.000 Roadway Profile Shape First Roadway Station Crest Length 50.000 Crest Elevation 711.000 Roadway Surface Gravel Top Width 22.300 Channel View... Roadway Elevation Calvert Properties Add G/vert 7F Dupiete Calvert �� Delete Calvert cfs cfs CULVERT DATA cfs Name J Circular J Smooth HDPE Shape a0 Material ft 4.000 ft Diameter —' 1 ft/ft 0.000 in C) Embedment Depth Manning's n 0.012 I ft —1 Culvert Type Straight Inlet Configuration Beveled Edge (1.5:1) (Ke-0.2) Inlet Depression? No J SITE DATA Site Data Input Option Calvert Invert Data ft 0.000 ft Inlet Station ft 705.800 ft Inlet Elevation ft J 42.000 ft 705.100 ft Outlet Station Outlet Elevation ft AmComputed 2 0.016667 ft/ft Number of Barrels Culvert Slope Help Click on any j icon for help on a specific topic Long Flon AOP Energy Dissipation Analyze Crossing F OK Cancel HY-8 Ex 48" Culvert Analysis Summary of Flows at Crossing - EX. 48Inches HDPE PIPE — ❑ X Display Geometry plot QQ Crossing Summary Table Ire -,. nation: 705.80 ft i- Q Culvert Summary Table Outlet Elevation: 705. 10 ft Q Water Surface Profiles Culvert Length: 42.01 ft Culvert Slope: 0.0167 Q Tapered Inlet Table Culvert Rise: 4.00 ft p Customized Table Culvert Span: 4.00 ft Outlet Control: Profiles Crossing Rating Gyve Culvert Performance Curve Selected Water Pro, Water Surface Profile C Help I Flow Types... C-dt Input Data... ry,ergy D'rsQat+an... ACID .. � Flow... I FEVort Report I MS Wad (`.doa) Close LD-229 Storm Drain Design Computations LOT A -13 BUNDORAN FARM LD-229 STORM DRAIN DESIGN COMPUTATIONS From To Catch. Runoff Inc Accum I0C. Total Total Dn Pie Inv Pie VelocityFlow time Point Point Area Coef AC AC Intensity _Up Flow(cfs) invert Invert Length Slope Capacity Inc ac (min) in/hr El El ft % cfs ft/s min 1 2 3 4 5 6 7 8 9* 10 11 12 13 M 15 16 17 *A2 Al - - - - - - 2.47 733.32 730.00 33.5 9.91%35.81 11.62 0.03 *B2 B 1 4.40 727.02 722.00 34.0 14.76% 43.72 1 15.85 1 0.02 Totalflow from H ydroCAD Q10-Yr 24-Hr Storm LOT A -13 BUNDORAN FARM Modified LD-268 Roadside and Median Ditch Design Form Desing Storm Side Slope Min. Max n= 0.05 Ditch C A CA Toc I - 1 in 12 110 Q - 1 in Q2 Q10 :1 L :1 R Slope Slope Allowable Velocity 2-yr 10-yr Matting Type Freebo0nl Channel 0esigned Depth SF AC INCR ACC Ft/Ft FUR *Velocity "Depth 'Velocity "Depth 1 0.29 156950 1 3.60 1.06 1.06 14.2 1.0 3.57 4.91 1.06 3.77 5.18 3 3 0.10 0.14 7.0 4.44 0.53 4.24 0.64 EC-3 TYPE 1 0.36 1.00 2 0.35 102913 1 2.36 0.83 0.83 15.4 1.0 3.43 4.73 0.83 2.84 3.92 3 3 0.02 0.03 4.0 2.32 0.64 2.51 0.72 EC-2 TYPE 1 0.28 1.00 3 0.36 4707 0.11 0.04 0.87 15.4 1.0 3.43 4.73 0.87 2.97 4.11 3 3 0.08 0.14 7.0 4.18 0.49 3.68 0.61 EC-3 TVPE I 0.39 1 1.00 4 0.29 186712 1 4.29 1 1.26 1 1.26 1 16.5 1 1.0 1 3.31 1 4.58 1 1.26 1 4.15 1 5.75 1 3 1 3 1 0.02 1 0.03 1 4.0 2.55 1 0.74 1 2.38 1 0.90 EC-2 TYPE 1 0.10 1.00 5 0.38 5008 0.11 0.04 1.30 16.5 1.0 3.31 4.58 1.30 4.30 5.96 3 3 0.02 0.06 4.0 3.34 0.66 2.40 0.91 EC-2 TYPE 1 0.09 1.00 6 0.29 136233 3.13 0.90 0.90 14.60 1.0 3.52 4.85 0.90 3.15 4.34 3 3 0.04 0.09 4.0 3.60 0.77 2.88 0.71 EC-2 TYPE 1 0.29 1.00 7 0.33 76481 1.76 0.58 0.58 18.64 1.0 3.10 4.32 0.58 1.79 2.49 3 3 0.10 0.14 4.0 3.69 0.40 3.53 0.49 EC-2 TVPE 1 0.52 1.00 "Velocity calculations performed using maximum slope for this application "Depth calculations performed using minimum slope for this application Conveyance Channel 3 inGueds area from culvert 2 "` Conveyance Channel 5 inGueds area from culvert 4 SHIM' ENGINEERING, P.C. Design Focused Engineering Independent Reports: NRCS Soils Report NOAA Precipitation Report 6/21/22, 12:55 PM Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3r„,„, �.�' Location name: North Garden, Virginia, USA* y ]®= Latitude: 37.9882°, Longitude:-78.6677° Elevation: 747.38 ft** source: ESRI Maps A -- source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T. Parzybok, 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 100 1 +oo zoo soo +000 5-min (0.09-0379) (0.369-0452) (0.4340.80) (0.48&0598) (0.548-0.673) (0.5-0..733) (06 35-0..790) (0.6 2 .844) (0.7114-0912) (0.747--0.969) +0-min (0.4940606) (0.591-0..722) (0.695-0.849) (0.781--098) (0.874107) (0.945--11.17) (1.01��25) (1.07-21.34) 1 (1: 3-t.44) 1 (1: &1.53) 1. 1.72 +s-min (0.6117--0..757) (0.743-0.908) (0.879 1.07) (0.988-11.21) (1. 6) (1.20-314.48) (1.2&11..59) (1.34-51..69) (1. 2-11..82)1 (1.48-1.92) 30-min (0.846---11.04) 1 (1.03-1325) 1 (1.25-1.53) 1 (1.43-1..75) 1 (1.64-2302) (1.802?23) (1.952.43) (2.09-2863) (2.6-22..89) (2.39-3.10) 1.17 IA 4.06 60-min (1.0&1.29) (1.29-1z57) (1.60-�96) (1.86-2.28) (2.?9-2.68) (2.44 3402) (26 9-3.35) (2.94 69) (3.24�414) (34 9-4.53) 2.98 4.23 2-hr (1.24i58) (1.51121) (1. 92239) (22 35281) (2.63-3.34) (2.9739.80) (3.314.26) (3.65-4.74) (4.11542) (4.48-6.01) 374) 3.26 3-hr (1.36- (1.652.11) (2.0&2.64) (2.42 3409) (2.87-3.69) (3.243.71 4-4.18) (3.62-4.71) (3. 965.25) (a. 06.02) (4.92 6768) 6-hr (17 &2.24) (2.142071) (26536.0) (3.131-3.96) .52 (3.41-4.75) (4. 25.44) (47 56.18) (5. 96.99) (6.05 8.15) (66 9-9.19) 8.34 +2-hr (22 52.88) (2.71-3.47) (3.36-432) (3.9755.11) (4.7 -621) (5. 9--37519) (6. 2827) (7. 0-9.46) (8. 2�.2) (9. 1712.9) 206 4-hr (27 53.43) 70 (33 3-4.15) (4. 35229) (4.976824) (6.06-674.63) 91 (6.978.82) (7.94-0.1) (8.9&11.6) (10.5- 3.7) (1114 15.6) 2-0ey (32 44.03) (39 3-4.88) (4. 86.19) (5.83-7.6) (7.03-8.81) (8.01-010.1) (9.06- 1.5) (102- 3.1) (11.8- 5.4) (1311--17.3) 65 3-day (3.48-4.6) (42415.16) (5. 3�55) (6.2407267) (7.5�30) (8. 8--610.7) (9.69- 2.1) (10.9- 3.7) (12.6-16.1) (14.0. 8.1) 4-day (3.714.50) (44 95.45) (5. 96.9) I (6.658.08) (8.02 9879) (9.15-121.2) (10.3- 2.8) (11.6-14A) (13.416.9) (14.8-19.0) 7. 7-day (4.33-5.17) (5261-6.22) (6. 070.77) (7.54-9.03) (9. 0--810.8) (102- 2.3) (114?13.9) (12745.6) (14.5-18.1) (16.0. 0.2) 10-dey (4.93-5.82) (5.926398) (7. 98360) (8.38-9.90) (9.M111.7) (111213.2) (12.3-14.8) (13.6-16.4) (15.3-18.8) (1670- 0.8) 20-dey (6.8-38) (7.829801) (9.4 -10.9) (107- 2.3) (12.3-14.3) (13.6- 5.8) (14.9-127.4) (162- 9.1) (179- 1.3) (19.3- 3.1) 30 dey (8.09-9.22) (9.59- 0.9) (11.3-12.9) (12.6-14.4) (14.3-16.4) (15.6-17.9) (16.8-19.3) (18?0- 0.8) (19.5 22.8) (20.6-24.2) 45-day (102-$.5) 1 (12.0- 3.5) 1 (14.0- 5.8) 1 (15.517.4) 1 (17.3- 9.6) 1 (1821.2) 1 (20.0.22.8) (212?24.3) (22?8-6.3) (23.9-27.8) 60-day 15.7) (12.0. 3.4) (141 (162-18.1) (178-9.9) (19722.1) (212? 3.8) (22-5 5.4) (236269) (25A288) (26.5 0.3) 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 Atlas 14 document for more information. Back to Top PF graphical hdps://hdsc.nws.noaa.govlhdsc/pfds/pfds_Printpage.html?lat=37.9882&Ion=-78.6677&data=depth&units=english&series=pds 1/4 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Albemarle County, Virginia June 15, 2022 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrGs.usda.govtwps/ portal/nres/main/soils/healthn and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https:Hoffices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nrGs.usda.govtwps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. 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USDA is an equal opportunity provider and employer. 3 Contents Preface.................................................................................................................... 2 How Soil Surveys Are Made..................................................................................5 Soil Information for All Uses.................................................................................8 Soil Properties and Qualities................................................................................ 8 Soil Qualities and Features...............................................................................8 HydrologicSoil Group................................................................................... 8 El How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and Soil Information for All Uses Soil Properties and Qualities The Soil Properties and Qualities section includes various soil properties and qualities displayed as thematic maps with a summary table for the soil map units in the selected area of interest. A single value or rating for each map unit is generated by aggregating the interpretive ratings of individual map unit components. This aggregation process is defined for each property or quality. Soil Qualities and Features Soil qualities are behavior and performance attributes that are not directly measured, but are inferred from observations of dynamic conditions and from soil properties. Example soil qualities include natural drainage, and frost action. Soil features are attributes that are not directly part of the soil. Example soil features include slope and depth to restrictive layer. These features can greatly impact the use and management of the soil. Hydrologic Soil Group Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (AID, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Ll Custom Soil Resource Report Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. W 38D {4E 36C 36C 14E �lonr� 16 _ 36D 19D 19C 38D MAPLEGEND Area of Interest (AOI) 0 Area of Interest (AOI) Solis Soil Rating Polygons 0 A 0 A/D 0 B 0 B/D o C 0 C/D 0 D 0 Not rated or not available Soil Rating Lines ~ A ~ AID Custom Soil Resource Report ❑ C p C/D p D 13 Not rated or not available Water Features Streams and Canals Transportation t..ty Rails N Interstate Highways ,y US Routes Major Roads Local Roads Background . Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:15,800. 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 �y B Soil map units are labeled (as space allows) for map scales rY BID 1:50,000 or larger. C CID Date(s) aerial images were photographed: Oct 14, 2019—Sep ti 23, 2020 N D 0 0 Not rated or not available The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background Soil Rating Points imagery displayed on these maps. As a result, some minor ■ A shifting of map unit boundaries may be evident. ■ n/o ■ B ■ B/D 11 Custom Soil Resource Report Table -Hydrologic Soil Group Map unit Symbol Map unit name Rating Acres in AOI Percent of AOI 4B Ashe loam, 2 to 7 B 2.1 0.3% percent slopes 41) Ashe loam, 15 to 25 B 37.3 5.2% percent slopes 4E Ashe loam, 25 to 45 B 57.2 8.0% percent slopes 7B Braddock loam, 2 to 7 B 7.4 1.0% percent slopes 7C Braddock loam, 7 to 15 B 3.2 0.4% percent slopes 14B Chester loam, 2 to 7 B 5.5 0.8% percent slopes 14C Chester loam, 7 to 15 B 11.2 1.6% percent slopes 14D Chester loam, 15 to 25 B 4.2 0.6% percent slopes 14E Chester loam, 25 to 45 B 6.5 0.9% percent slopes 15C Chester very stony loam, B 0.4 0.1% 7 to 15 percent slopes 15D Chester very stony loam, B 0.5 0.1% 15 to 25 percent slopes 16 Codorus silt loam, 0 to 2 B/D 3.5 0.5% percent slopes, occasionally flooded 19B Minnieville loam, 2 to 7 B 30.5 4.3% percent slopes 19C Minnieville loam, 7 to 15 B 78.6 11.0% percent slopes 19D Minnieville loam, 15 to B 37.6 5.2% 25 percent slopes 20C3 Minnieville clay loam, 7 B 18.8 2.6% to 15 percent slopes, severely eroded 20D3 Minnieville clay loam, 15 B 18.8 2.6% to 25 percent slopes, severely eroded 25B Dyke silt loam, 2 to 7 B 108.9 15.2% percent slopes 25C Dyke silt loam, 7 to 15 B 75.2 10.5% percent slopes 26C3 Dyke clay loam, 7 to 15 B 12.4 1.7% percent slopes, severely eroded W Custom Soil Resource Report Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 26D3 Dyke clay loam, 15 to 25 B 13.5 1.9 % percent slopes, severely eroded 36B Hayesville loam, 2 to 7 B 1.7 0.2% percent slopes 36C Hayesville loam, 7 to 15 B 26.3 3.7% percent slopes 36D Hayesville loam, 15 to 25 B 11.4 1.6% percent slopes 36E Hayesville loam, 25 to 45 B 0.2 0.0% percent slopes 37D3 Hayesville Gay loam, 15 B 6.5 0.9% to 25 percent slopes, severely eroded 37E3 Hayesville Gay loam, 25 B 4.5 0.6% to 45 percent slopes, severely eroded 38D Hayesville loam, 15 to 25 B 6.4 0.9% percent slopes, very stony 55B Danripple loam, 2 to 7 C 2.2 0.3% percent slopes, rarely flooded 56B Meadowville loam, 2 to 7 A 43.7 6.1% percent slopes 66E Parker very stony loam, A 25.1 3.5% 25 to 45 percent slopes 76 Dan River loam, 0 to 2 B 17.2 2.4% percent slopes, occasionally flooded 77 Dan River-Codorus B 6.8 0.9% complex, 0 to 2 percent slopes, occasionally flooded 79B Meadowville silt loam, 2 B 2.1 0.3% to 7 percent slopes 81 B Thumront loam, 2 to 7 B 1.9 0.3% percent slopes 89B Unison silt loam, 2 to 7 B 12.9 1.8% percent slopes 89C Unison silt loam, 7 to 15 B 7.0 1.0% percent slopes W Water 8.6 1.2% Totals for Area of Interest 717.9 100.0% Rating Options -Hydrologic Soil Group Aggregation Method., Dominant Condition 13 SHIMP ENGINEERING, P.C. 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