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HomeMy WebLinkAboutWPO202000015 Calculations 2020-06-08 (2)SHIMP ENGINEERING, P.C. Design Focused Engineering June 081", 2020 County VSMP Review Albemarle County Regarding: Perry Residence SWM Calculation Packet Dear Reviewer: Enclosed is the Stormwater Management Calculations Packet for Perry Residence. The enclosed calculations demonstrate compliance with the runoff requirements set forth in 9VAC25-870-65-A. This project will disturb an area of 3.58 acres. The stormwater management strategy for this site is governed by the VRRM Development Spreadsheet. Per 9VAC25-870-65-A, the total TP Load Reduction Required is 1.12 lb/yr. This was calculated using the DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet. A total of 3.28 ac undisturbed Open Space will be placed into a conservation easement to meet the requirements of 9VAC25-870-65-A. This dedicated Open Space is applied to the VRRM spreadsheet, giving a Required TP Load Reduction of 0.0 lb/yr. To treat runoff quantity, stormwater water is managed on site through the utilization of sheet flow where possible & by providing (2) two level spreaders which will allow concentrated flow to leave the site in sheet flow conditions. Pre-Dev Runoff Post-Dev Runoff POA 1-Year Storm 10-Year Storm 1-Year Storm 10-Year Storm 1 0.78 5.66 0.36 4.05 2A-2B 0.79 7.43 1.77 10.80 3 0.71 6.69 0.55 5.25 If you have any questions please feel free to contact me via e-mail at michae1gshimp-engineering.com or Justin Shimp at justin@shimp-engineering.com or by telephone at 434-227-5140. Sincerely, Michael Chandler Shimp Engineering, P.0 Contents: Stormwater Quality Calculations: Post -Development VRRM Land Cover Map VRRM Development Spreadsheet Pre -Development Calculations: Pre-Dev Drainage Map Pre-Dev HydroCAD Report Time concentration Calculations Post-Dev Runoff Quantity Calculations: Post-Dev Drainage Map Post-Dev Ditch Drainage Map Post-Dev HydroCAD Report VDOT LD-268 Ditch Capacity Culvert Analysis Time concentration Calculations Independent Reports: Excerpt from NRCS Soil Report NOAA Precipitation Report Stormwater Quality Calculations: Post -Development VRRM Land Cover Map VRRM Development Spreadsheet SIIIVIPEYNY IRI ,, P. C. ENGINEERING-LAMDFLAMMM-PRO.MCT MANAGEMENT 912 E HIGH ST PHONE: (434) 227-5140 CHARLOTTESVILLE. VA 22902 JUSTIN®SHIMP-ENGINEERING.COM PERRY RESIDENCE POST -Development VRRM Map REVISED: 06-01 -2020 I A Soils I B Soils I C Soils I D Soils I Totals IN Forest/Open Space (acres) -- undisturbed, 3.28 protected forest/open sace or reforested 3.28 Managed Turf (acres) -- disturbed, graded for yards or other turf to be 3.02 3.02 :1 Impervious Cover (acres) 0.56 0.56 * Forest/Open Space areas must be protected in accordance with the Virginia Runoff Reduction Method 6.86 DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet -Version 3.0 L: 2011 BMP Standards and specifications ID 2013 Draft BMP Standards and Specifications Project Name: Perry Residence data input cells Date: 6/2/2020 constant values BMP Design Specifications List: 2013 Draft Stds & Specs calculation cells (Site Information Post -Development Project (Treatment Volume and Loads) Land Cover (acres) A Soils I B Soils C Soils D Soils Totals Forest/Open Space (acres) -- undisturbed, protected forest/open space or reforested land 3.28 3.28 Managed Turf (acres) -- disturbed, graded for yards or other turf to be mowed/managed 3.02 3.02 Impervious Cover (acres) 0.56 0.56 * Forest/Open Space areas most be protected in accordance with the Virginia Runoff Reduction Method 6.86 Constants Runoff Coefficients (Rv) Annual Rainfall (inches) 43 ASoils BSoils CSoils DSoils Target Rainfall Event (inches) 1.00 Forest/Open Space 0.02 0.03 0.04 0.05 Total Phosphorus (TP) EMC (mg/L) 0.26 Managed Turf 0.15 0.20 0.22 0.25 Total Nitrogen (TN) EMC (mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 Target TP Load (lb/acre/yr) 0.41 Pj (unitless correction factor) 0.90 Land Cover Summary Treatment Volume and Nutrient Loads Treatment Volume (acre-ft) 0.1029 Treatment Volume (cubic feet) 4,481 TP Load (lb/yr) 2.82 TN Load (Ib/yr) 20.14 Informational Pu oses Onl Forest/Open Space Cover (acres) 3.28 Weighted Rv (forest) 0.03 % Forest 48% Managed Turf Cover (acres) 3,02 Weighted Rv (turf) 0.20 %Managed Turf 44% Impervious Cover (acres) 0.56 Rv (impervious) 0.95 %Impervious 8% Site Area (acres) 6.86 Site Rv 0.18 Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: Perry Residence Date: 43984 Total Rainfall = 43 inches Site Land Cover Summary A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 3.28 0.00 0.00 3.28 48 Managed Turf (acres) 0.00 3.02 0.00 0.00 3.02 44 Impervious Cover (acres) 0.00 0.56 0.00 0.00 0.56 8 6.86 100 Site Tv and Land Cover Nutrient Loads Site Rv 0.18 Treatment Volume (ft) 4,481 TP Load (lb/yr) 2.82 TN Load (lb/yr) 20.14 Total TP Load Reduction Required (lb/yr) 0.00 — TP LOAD REDUCTION NOT REQUIRED Site Compliance Summary Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (lb/yr) 0.00 Remaining Post Development TP Load 2.82 (lb/yr) Remaining TP Load Reduction (lb/yr) Required 0.00 **No further TP load reduction required (Required - Achieved < 0.005 Ib/yr) Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area Summary D.A. A D.A. B D.A. 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 D.A. A D.A. B D.A. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TN Load Reduced (lb/yr) 0.00 0.00 0.00 0.00 0.00 0.00 Summary Print Virginia Runoff Reduction Method Worksheet ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Runoff Volume and CN Calculations 1-year storm 2-year storm 30-year storm Target Rainfall Event (in) 1 0.00 0.00 0.00 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 (fta) 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 (ws-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 (ws-in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print Pre -Development Calculations: Pre-Dev Drainage Map Pre-Dev HydroCAD Report Time concentration Calculations 150 0 150 300 450 SCALE: 1 "=150' REVISED: 04-20-2020 I 100' i STREAM BUFFER DA-2. 4.79 cc Imp=0.00 cc Turf=4.09 cc Woods=0.69 cc 15.8 min DA-1 3.06 cc Imp=0.16 cc Turf=2.17 cc Woods=0.73 cc 100' STREAM BUFFER EXISTING STREAM \ \ \ \ I / / / 51-24C ( PERRY, ROBERT F D.B. 5084/249 52.92 AC RIVANNA DISTRICT USE: VACANT RESIDENTIAL LAND 6.6 min II DA-3 oA 3 4.17 cc J PRE Imp=0.0 cc Turf=3.41 cc Woods=0.76 cc TOC=17.5 mirr'; ' PRE \ S23-�2357Y StOt, RO 7 4.33, (50, lwj 231 OA 1 _-- PRE Predev Drainage Area Impervious Woods Managed Turf DA SF AC SF AC SF AC SF AC 1 133154A7 3.06 6833.55 0.16 31865.26 0.73 94455.36 2.17 2 208603.71 4.79 0.00 0.00 30255.67 0.69 178348.04 4.09 3 181607.45 4.17 0.00 0.00 33081.08 0.76 148526.37 3.41 TOTAL 523365.33 12.01 6833.55 0.16 95202.01 2.19 421329.77 9.67 \ 2 it STREAM -EX DIRT DRIVEWAY Flow Rates (cfs) 1-yr 10-yr 100-yr 0.78 5.66 15.25 0.79 7.43 21.22 0.71 6.69 19.04 2.28 19.78 55.51 Pre -Development HydroCAD Report Perry Residence is 30S 5S p -1 D -2 D -3 47 47 1�7 2L 4L 6L POA 1 POA 2 POA 3 Subcat Reach Pon Li nk Drainage Diagram for Pre Dev - PERRY RESIDENCE Prepared by {enter your company name here}, Printed 6/4/2020 HydroCADOO 9.10 s/n 07054 © 2011 HydroCAD Software Solutions LLC PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 1yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 2 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 Subcatchment 1S: DA-1 Runoff Area=3.060 ac 5.23% Impervious Runoff Depth>0.28" Tc=15.8 min CN=62 Runoff=0.78 cfs 0.072 of Link 2L: POA 1 Inflow=0.78 cfs 0.072 of Primary=0.78 cfs 0.072 of Subcatchment 3S: DA-2 Runoff Area=4.780 ac 0.00% Impervious Runoff Depth>0.23" Tc=17.5 min CN=60 Runoff=0.79 cfs 0.092 of Link 4L: POA 2 Inflow=0.79 cfs 0.092 of Primary=0.79 cfs 0.092 of Subcatchment 5S: DA-3 Runoff Area=4.170 ac 0.00% Impervious Runoff Depth>0.23" Tc=16.6 min CN=60 Runoff=0.71 cfs 0.080 of Link 6L: POA 3 Inflow=0.71 cfs 0.080 of Primary=0.71 cfs 0.080 of Total Runoff Area = 12.010 ac Runoff Volume = 0.245 of Average Runoff Depth = 0.24" 98.67% Pervious = 11.850 ac 1.33% Impervious = 0.160 ac PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1 S: DA-1 Runoff = 0.78 cfs @ 12.13 hrs, Volume= 0.072 af, Depth> 0.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.160 98 Paved parking, HSG B 2.170 61 >75% Grass cover, Good, HSG B 0.730 55 Woods, Good, HSG B 3.060 62 Weighted Average 2.900 94.77% Pervious Area 0.160 5.23% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 0.85 _II 1 I 1 1 1 I ■Runoff 0.8 o.78 cis I Ir 0.75 - _ -1 _ - 1- _ _ _ -I - _ -1 Type 1 �4Wr I yr_ 0.7 IF 0.65 0.6 T- T--I- -F - --- -- RunbffArear106G-ac 0.55— �— —I —— ——R-unOffi G1ume-O 2Iaf 5 1- -'RuI 0. 8'- 0.41--1-1-L ? :0.4 _-- -- - - - 6=1-58ni in- 0.35 �1+ 1�s�- 0.3 M-6 0.25 1 1 0.2 T - - - - - T 0.15 _ + 1 0.1 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 4 Summary for Link 2L: POA 1 Inflow Area = 3.060 ac, 5.23% Impervious, Inflow Depth > 0.28" for 1 yr event Inflow = 0.78 cfs @ 12.13 hrs, Volume= 0.072 of Primary = 0.78 cfs @ 12.13 hrs, Volume= 0.072 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: POA 1 Hydrograph ■ Inflow ❑ Primary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Pace 5 Summary for Subcatchment 3S: DA-2 Runoff = 0.79 cfs @ 12.17 hrs, Volume= 0.092 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.000 98 Paved parking, HSG B 4.090 61 >75% Grass cover, Good, HSG B 0.690 55 Woods, Good, HSG B 4.780 60 Weighted Average 4.780 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph 0.85 — — — — — —I — — — — — — — — — — — — — — — — — — — — ❑Runoff 0 8 0.75 1 1 1 1 1 1 o.7s — — —1 — — 1— — — — — cfs 1 1 1 1 — I— — —1 Typed M;-11 r 1 yr 07aanfall-2.�4" -T-� �- -rt---1--�- - --1--- T--T -r-Brt--1- 0 0.6 + ---1--�- /1 -- R�ffArea--43 � .6 0.55 ---I--�- 4 - - -1- - - -gyp 4 1`, I t--4- 1 - RunGffiVolum".J941af w 0.5 v 1 1 1 1 — — — Ra1po# �fh 0.�31 0.45 2 0.4 LL 1 1—-1—-1—— 1 —— 1 1 1 - =17c15Min 0.35 0.3 1 1 1 1 7 1 1 I I 1 1 1 0.25 0.2 T -—I- 0.15 0.1 — + 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Prepared by {enter your company name here} HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Type // 24-hr l yr Rainfall=2.84" Printed 6/4/2020 Page 6 Summary for Link 4L: POA 2 Inflow Area = 4.780 ac, 0.00% Impervious, Inflow Depth > 0.23" for 1 yr event Inflow = 0.79 cfs @ 12.17 hrs, Volume= 0.092 of Primary = 0.79 cfs @ 12.17 hrs, Volume= 0.092 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 4L: POA 2 Hydrograph i ■ Inflow 0.85 0.79 cfs I I I I I I 1 ❑ Primary 0.8 _ - °.79cfs -Inflow /-4rea780 be - �_1 1 — — I— 1 1 I , ------------- --------------- 0.75 1 1 1 1 1 1 1 1 1 1 1 1 1 0.7 1 1 1 1 1 1 1 1 1 1 1 1 0.65 0.6 T 7 1 I T _ 7 _ _1 _ _1_ _ 1_ _ r .1 _ _1_ _ I T T 1 1_ _ T — T 1 0.55 / i T — 7 — —I — —I r - — —1 — —I— 1 T T — -1— — y 0.5 t — rt — —I — —I I r rt — —I — I I T t — -1 — — 0.45 0.4 + — — — LL 035 i T—-4—-1——I I -4 - -1 - I I T 4-— —— .35 0.3 — L — - — —1 — —I_ 1 1 0.25 _ L _ 1 _ _I 0.2 0.15 PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 5S: DA-3 Runoff = 0.71 cfs @ 12.16 hrs, Volume= 0.080 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1yr Rainfall=2.84" Area (ac) CN Description 0.000 98 Paved parking, HSG B 3.410 61 >75% Grass cover, Good, HSG B 0.760 55 Woods, Good, HSG B 4.170 60 Weighted Average 4.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph — rt — � — — I — — � — — — — — — I — — — ❑Runoff 0.75 — 4 — — — — — - — — — — v 0.71 ofs 0.7 — Type 11 24-hr lyr 0.65 Rainfall=2.84" 0.6 0.55 T F - - - Runoff Area=4.170 ac 0.5. 1—A--I--L--RunoffVolume=0.080af y 0'— ! 0.4 Runoff Depth>0.23" E 0.35 Tc=16.6 min 0.3 CN=60 0.25 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 8 Summary for Link 6L: POA 3 Inflow Area = 4.170 ac, 0.00% Impervious, Inflow Depth > 0.23" for 1 yr event Inflow = 0.71 cfs @ 12.16 hrs, Volume= 0.080 of Primary = 0.71 cfs @ 12.16 hrs, Volume= 0.080 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 6L: POA 3 Hydrograph ■ Inflow ❑ Primary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Paae 9 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 Subcatchment 1S: DA-1 Runoff Area=3.060 ac 5.23% Impervious Runoff DepthA.40" Tc=15.8 min CN=62 Runoff=5.66 cfs 0.357 of Link 2L: POA 1 Inflow=5.66 cfs 0.357 of Primary=5.66 cfs 0.357 of Subcatchment 3S: DA-2 Runoff Area=4.780 ac 0.00% Impervious Runoff DepthA.26" Tc=17.5 min CN=60 Runoff=7.43 cfs 0.503 of Link 4L: POA 2 Inflow=7.43 cfs 0.503 of Primary=7.43 cfs 0.503 of Subcatchment 5S: DA-3 Runoff Area=4.170 ac 0.00% Impervious Runoff DepthA.26" Tc=16.6 min CN=60 Runoff=6.69 cfs 0.439 of Link 6L: POA 3 Inflow=6.69 cfs 0.439 of Primary=6.69 cfs 0.439 of Total Runoff Area = 12.010 ac Runoff Volume = 1.298 of Average Runoff Depth = 1.30" 98.67% Pervious = 11.850 ac 1.33% Impervious = 0.160 ac PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 10 Summary for Subcatchment 1 S: DA-1 Runoff = 5.66 cfs @ 12.09 hrs, Volume= 0.357 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.160 98 Paved parking, HSG B 2.170 61 >75% Grass cover, Good, HSG B 0.730 55 Woods, Good, HSG B 3.060 62 Weighted Average 2.900 94.77% Pervious Area 0.160 5.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 6 [ 5 ————————t——I- 4 N I I 0 3 LL ————————t——I- 2 1 I I I Type 11 24-h r 10yr Rainfall=5.20" Runoff Area=3.060 ac Runoff Volume=0.357 of Runoff Depth>1.40" Tc=15.8 min CN=62 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 11 Summary for Link 2L: POA 1 Inflow Area = 3.060 ac, 5.23% Impervious, Inflow Depth > 1.40" for 10yr event Inflow = 5.66 cfs @ 12.09 hrs, Volume= 0.357 of Primary = 5.66 cfs @ 12.09 hrs, Volume= 0.357 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 2L: POA 1 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 12 Summary for Subcatchment 3S: DA-2 Runoff = 7.43 cfs @ 12.12 hrs, Volume= 0.503 af, Depth> 1.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.000 98 Paved parking, HSG B 4.090 61 >75% Grass cover, Good, HSG B 0.690 55 Woods, Good, HSG B 4.780 60 Weighted Average 4.780 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.5 Direct Entry, 7 N 3 4 0 LL 1 Subcatchment 3S: DA-2 Hydrograph I I I I I I I I I [ I I 1 I I I I I I L I I I I I I -t I I I I I I I I I I I I i I I I I I I I I I I Type tl -24i1 r 10yr I,ai6fa11:'F5.�O" Runoff Areal=4.780 ac Runoff Vorume-911503 of Runoff De;pth �1-1.-26" ' ' Tc1-17.5 min CN=60 I I Q✓�11111111111111l111���,1���������J 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 13 Summary for Link 4L: POA 2 Inflow Area = 4.780 ac, 0.00% Impervious, Inflow Depth > 1.26" for 10yr event Inflow = 7.43 cfs @ 12.12 hrs, Volume= 0.503 of Primary = 7.43 cfs @ 12.12 hrs, Volume= 0.503 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 4L: POA 2 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Inflow ■ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 14 Summary for Subcatchment 5S: DA-3 Runoff = 6.69 cfs @ 12.11 hrs, Volume= 0.439 af, Depth> 1.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.000 98 Paved parking, HSG B 3.410 61 >75% Grass cover, Good, HSG B 0.760 55 Woods, Good, HSG B 4.170 60 Weighted Average 4.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph — — — — t- - 1- 7 I I I I [ I I 6 I I I I 1 1 L - 1 5 I I I I I I I w I I T 1 I I 1 F I I - 1 4 _o LL 3 I I I I I I I I I I I I +t-1 2 1 1 I 1 Type 11 24-h r 10yr Rainfall=5.20" Runoff Area=4.170 ac Runoff Volume=0.439 of Runoff Depth>1.26" - Tc=16.6 min CN-60 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 15 Summary for Link 6L: POA 3 Inflow Area = 4.170 ac, 0.00% Impervious, Inflow Depth > 1.26" for 10yr event Inflow = 6.69 cfs @ 12.11 hrs, Volume= 0.439 of Primary = 6.69 cfs @ 12.11 hrs, Volume= 0.439 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 6L: POA 3 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 16 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 Subcatchment 1S: DA-1 Runoff Area=3.060 ac 5.23% Impervious Runoff Depth>3.65" Tc=15.8 min CN=62 Runoff=15.25 cfs 0.931 of Link 2L: POA 1 Inflow=15.25 cfs 0.931 of Primary=15.25 cfs 0.931 of Subcatchment 3S: DA-2 Runoff Area=4.780 ac 0.00% Impervious Runoff Depth>3.42" Tc=17.5 min CN=60 Runoff=21.22 cfs 1.364 of Link 4L: POA 2 Inflow=21.22 cfs 1.364 of Primary=21.22 cfs 1.364 of Subcatchment 5S: DA-3 Runoff Area=4.170 ac 0.00% Impervious Runoff Depth>3.43" Tc=16.6 min CN=60 Runoff=19.04 cfs 1.190 of Link 6L: POA 3 Inflow=19.04 cfs 1.190 of Primary=19.04 cfs 1.190 of Total Runoff Area = 12.010 ac Runoff Volume = 3.486 of Average Runoff Depth = 3.48" 98.67% Pervious = 11.850 ac 1.33% Impervious = 0.160 ac PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 17 Summary for Subcatchment 1 S: DA-1 Runoff = 15.25 cfs @ 12.08 hrs, Volume= 0.931 af, Depth> 3.65" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.160 98 Paved parking, HSG B 2.170 61 >75% Grass cover, Good, HSG B 0.730 55 Woods, Good, HSG B 3.060 62 Weighted Average 2.900 94.77% Pervious Area 0.160 5.23% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 17--------I--♦ -�---+--1--1--4- 16 — — 15.25 cfs — — — 15 _ _I _ _I _ _ I_ _ _ _ _ _ _I _ Jypel IL 2-4--hr-1 0Gyr 14 L 13 - - - - - - - - -1 - - 1 - air faH l - - - - - - - - - - - - - - - - 12 - -' - -1- - 1 1 ! ]Rundff ArQai-3-Q6D tC 11 1 1 1 1 1 1 T - —1 — - F � -1 1— - T RunOff�lu ome OMF1Taf y10-t--1—-1--t--1 -1- -�--1 R nt Dp' 1_ A!(-Cr 9 ——-1—-1—-4--�--1— —4--I— 4—oeip —th� —q- 1 L L Te'-151$Min " 7 6 Ir-,62 — — — — — — — — — — — - — — — — — — — — — — — — — — — 5 — — — — — — — — — — — — — — — — — —— 4 — — 1 — T- T —-1—-1——— -1— - 3 t—-1——I—— - 2 — — 1 I I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 18 Summary for Link 2L: POA 1 Inflow Area = 3.060 ac, 5.23% Impervious, Inflow Depth > 3.65" for 100yr event Inflow = 15.25 cfs @ 12.08 hrs, Volume= 0.931 of Primary = 15.25 cfs @ 12.08 hrs, Volume= 0.931 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs 1 1 1 1 1 1 1 1 N U 3 0 LL Link 2L: POA 1 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 19 Summary for Subcatchment 3S: DA-2 Runoff = 21.22 cfs @ 12.10 hrs, Volume= 1.364 af, Depth> 3.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.000 98 Paved parking, HSG B 4.090 61 >75% Grass cover, Good, HSG B 0.690 55 Woods, Good, HSG B 4.780 60 Weighted Average 4.780 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph 23 11I 22 -4--1--I--4-- 21 -T--1--I---r- 20 1F T - 19 - 18 ----1--1-- - 17 -------4--�--I- 16 -t--1----t-�--I- 15 T 1 F T U13 - 1-- - - I -- ---I- 12 - - -1 - - I- - - - - I- 11 _0 LL 10 T 9 8 - _ - _I_ _I 7 _ _ _ _I _ _ I_ _ 1 6 1 4- 5 t---1--t�1- 4 -T T--1 3 - - - -�-I1IT +--1--�--4---1--I--4-- -Ty pe�iF+hr 1e( yr - Oa6faHr�g6„ - - - - - - - - - - - - - - - - - - -%n6ff Areal-�Tf8fl lac — t — —1— — � — t — —1 - —I— — t — T RUrtOffr-VOkt a 1364Taf ono DAh�3_ v - - --1---+Tc'-171:5-Min _ I1 IC_nt_=-i6a_ 4 - -1 t- - - -I - - 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 20 Summary for Link 4L: POA 2 Inflow Area = 4.780 ac, 0.00% Impervious, Inflow Depth > 3.42" for 100yr event Inflow = 21.22 cfs @ 12.10 hrs, Volume= 1.364 of Primary = 21.22 cfs @ 12.10 hrs, Volume= 1.364 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 4L: POA 2 Hydrograph 23 t -1 t- - fi 21.22 cfs-yy�- -%jam(-���- 22 - T - F 21.22 cfs - nfllowrArea�'T.7VV ac- 21 20 — — L — -J — 1 I L-1 — — — — — —1- I L -i 1 I L 19 ——--4—-1--I--k —I—-4--4—-1——I——�- 18 17 15 1—-1—-1 I L ——I L— —-1 1 L �14 - + — --—-1--I— I--——---I--�— �13 -T—T--1--1-— 1--7--7—-1--1--F- 12 - — — — — 1 — — — — — — I— — — — — — — — — — — — — — — I_ 1 1 I— — _ _ —I — — — _ — _ _ _I — —I— — — .2011 LL 10 4-III 1I III 9 —t—---t—-1--I--t-— I —I--I--t—-t—-1--I--�- 8- 7- 6- L11L — 1— — L — 1 —1— — L — 5- -4 —1— —I— — — — — — - —I— — — 4. T — —1— —1— — r — - T — T — 3 2' 1' 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) IN Inflow 11 ■ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 21 Summary for Subcatchment 5S: DA-3 Runoff = 19.04 cfs @ 12.09 hrs, Volume= 1.190 af, Depth> 3.43" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.000 98 Paved parking, HSG B 3.410 61 >75% Grass cover, Good, HSG B 0.760 55 Woods, Good, HSG B 4.170 60 Weighted Average 4.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph 21 - + - - - I- + - + - - I- - + - + - -1 - + - -1 - - I- - 4 - - t - -I - - 1- - t - - - - I- - i - - - -1 - - - � - -1 - - I- - t - ■Runoff 20 19 fi —1 - 19.04 cfs r rt fi T 1 1 T T - 1_ 7yper1U24-- trlOQ- r 18 17 1 1 —— - - - - -- - - -- - - - -- - Gait aN �6„ 16 15 1 1 ! 1 ! ! 1 !-Runb# AKed=4.WO-6c 13 _ 6 1 11 T1� �,� 11 1 n^1 R�n�f�V�1lJLILC�Le.��V z 1, - + - -1 - - 11- - -I -R n00 D0pth�J.A-�'3-7 A 11 4- - -4 _2 10 - - -1- + Tc' f1$itin a 9 8 T—-1—-1—T�1—-1rT11fi ^ —T—-1—-1——T--1--1——T—-1--r—T--T--C- -69 7 6 -T 1 T--1--1- _7 1 F -T 1 T- — 5 3 2 — — — 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 22 Summary for Link 6L: POA 3 Inflow Area = 4.170 ac, 0.00% Impervious, Inflow Depth > 3.43" for 100yr event Inflow = 19.04 cfs @ 12.09 hrs, Volume= 1.190 of Primary = 19.04 cfs @ 12.09 hrs, Volume= 1.190 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 6L: POA 3 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 1yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 2 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 Subcatchment 1S: DA-1 Runoff Area=3.060 ac 5.23% Impervious Runoff Depth>0.28" Tc=15.8 min CN=62 Runoff=0.78 cfs 0.072 of Link 2L: POA 1 Inflow=0.78 cfs 0.072 of Primary=0.78 cfs 0.072 of Subcatchment 3S: DA-2 Runoff Area=4.780 ac 0.00% Impervious Runoff Depth>0.23" Tc=17.5 min CN=60 Runoff=0.79 cfs 0.092 of Link 4L: POA 2 Inflow=0.79 cfs 0.092 of Primary=0.79 cfs 0.092 of Subcatchment 5S: DA-3 Runoff Area=4.170 ac 0.00% Impervious Runoff Depth>0.23" Tc=16.6 min CN=60 Runoff=0.71 cfs 0.080 of Link 6L: POA 3 Inflow=0.71 cfs 0.080 of Primary=0.71 cfs 0.080 of Total Runoff Area = 12.010 ac Runoff Volume = 0.245 of Average Runoff Depth = 0.24" 98.67% Pervious = 11.850 ac 1.33% Impervious = 0.160 ac PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1 S: DA-1 Runoff = 0.78 cfs @ 12.13 hrs, Volume= 0.072 af, Depth> 0.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.160 98 Paved parking, HSG B 2.170 61 >75% Grass cover, Good, HSG B 0.730 55 Woods, Good, HSG B 3.060 62 Weighted Average 2.900 94.77% Pervious Area 0.160 5.23% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 0.85 _II 1 I 1 1 1 I ■Runoff 0.8 o.78 cis I Ir 0.75 - _ -1 _ - 1- _ _ _ -I - _ -1 Type 1 �4Wr I yr_ 0.7 IF 0.65 0.6 T- T--I- -F - --- -- RunbffArear106G-ac 0.55— �— —I —— ——R-unOffi G1ume-O 2Iaf 5 1- -'RuI 0. 8'- 0.41--1-1-L ? :0.4 _-- -- - - - 6=1-58ni in- 0.35 �1+ 1�s�- 0.3 M-6 0.25 1 1 0.2 T - - - - - T 0.15 _ + 1 0.1 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 4 Summary for Link 2L: POA 1 Inflow Area = 3.060 ac, 5.23% Impervious, Inflow Depth > 0.28" for 1 yr event Inflow = 0.78 cfs @ 12.13 hrs, Volume= 0.072 of Primary = 0.78 cfs @ 12.13 hrs, Volume= 0.072 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: POA 1 Hydrograph ■ Inflow ❑ Primary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Pace 5 Summary for Subcatchment 3S: DA-2 Runoff = 0.79 cfs @ 12.17 hrs, Volume= 0.092 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.000 98 Paved parking, HSG B 4.090 61 >75% Grass cover, Good, HSG B 0.690 55 Woods, Good, HSG B 4.780 60 Weighted Average 4.780 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph 0.85 — — — — — —I — — — — — — — — — — — — — — — — — — — — ❑Runoff 0 8 0.75 1 1 1 1 1 1 o.7s — — —1 — — 1— — — — — cfs 1 1 1 1 — I— — —1 Typed M;-11 r 1 yr 07aanfall-2.�4" -T-� �- -rt---1--�- - --1--- T--T -r-Brt--1- 0 0.6 + ---1--�- /1 -- R�ffArea--43 � .6 0.55 ---I--�- 4 - - -1- - - -gyp 4 1`, I t--4- 1 - RunGffiVolum".J941af w 0.5 v 1 1 1 1 — — — Ra1po# �fh 0.�31 0.45 2 0.4 LL 1 1—-1—-1—— 1 —— 1 1 1 - =17c15Min 0.35 0.3 1 1 1 1 7 1 1 I I 1 1 1 0.25 0.2 T -—I- 0.15 0.1 — + 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Prepared by {enter your company name here} HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Type // 24-hr l yr Rainfall=2.84" Printed 6/4/2020 Page 6 Summary for Link 4L: POA 2 Inflow Area = 4.780 ac, 0.00% Impervious, Inflow Depth > 0.23" for 1 yr event Inflow = 0.79 cfs @ 12.17 hrs, Volume= 0.092 of Primary = 0.79 cfs @ 12.17 hrs, Volume= 0.092 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 4L: POA 2 Hydrograph i ■ Inflow 0.85 0.79 cfs I I I I I I 1 ❑ Primary 0.8 _ - °.79cfs -Inflow /-4rea780 be - �_1 1 — — I— 1 1 I , ------------- --------------- 0.75 1 1 1 1 1 1 1 1 1 1 1 1 1 0.7 1 1 1 1 1 1 1 1 1 1 1 1 0.65 0.6 T 7 1 I T _ 7 _ _1 _ _1_ _ 1_ _ r .1 _ _1_ _ I T T 1 1_ _ T — T 1 0.55 / i T — 7 — —I — —I r - — —1 — —I— 1 T T — -1— — y 0.5 t — rt — —I — —I I r rt — —I — I I T t — -1 — — 0.45 0.4 + — — — LL 035 i T—-4—-1——I I -4 - -1 - I I T 4-— —— .35 0.3 — L — - — —1 — —I_ 1 1 0.25 _ L _ 1 _ _I 0.2 0.15 PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 5S: DA-3 Runoff = 0.71 cfs @ 12.16 hrs, Volume= 0.080 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1yr Rainfall=2.84" Area (ac) CN Description 0.000 98 Paved parking, HSG B 3.410 61 >75% Grass cover, Good, HSG B 0.760 55 Woods, Good, HSG B 4.170 60 Weighted Average 4.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph — rt — � — — I — — � — — — — — — I — — — ❑Runoff 0.75 — 4 — — — — — - — — — — v 0.71 ofs 0.7 — Type 11 24-hr lyr 0.65 Rainfall=2.84" 0.6 0.55 T F - - - Runoff Area=4.170 ac 0.5. 1—A--I--L--RunoffVolume=0.080af y 0'— ! 0.4 Runoff Depth>0.23" E 0.35 Tc=16.6 min 0.3 CN=60 0.25 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 8 Summary for Link 6L: POA 3 Inflow Area = 4.170 ac, 0.00% Impervious, Inflow Depth > 0.23" for 1 yr event Inflow = 0.71 cfs @ 12.16 hrs, Volume= 0.080 of Primary = 0.71 cfs @ 12.16 hrs, Volume= 0.080 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 6L: POA 3 Hydrograph ■ Inflow ❑ Primary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Paae 9 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 Subcatchment 1S: DA-1 Runoff Area=3.060 ac 5.23% Impervious Runoff DepthA.40" Tc=15.8 min CN=62 Runoff=5.66 cfs 0.357 of Link 2L: POA 1 Inflow=5.66 cfs 0.357 of Primary=5.66 cfs 0.357 of Subcatchment 3S: DA-2 Runoff Area=4.780 ac 0.00% Impervious Runoff DepthA.26" Tc=17.5 min CN=60 Runoff=7.43 cfs 0.503 of Link 4L: POA 2 Inflow=7.43 cfs 0.503 of Primary=7.43 cfs 0.503 of Subcatchment 5S: DA-3 Runoff Area=4.170 ac 0.00% Impervious Runoff DepthA.26" Tc=16.6 min CN=60 Runoff=6.69 cfs 0.439 of Link 6L: POA 3 Inflow=6.69 cfs 0.439 of Primary=6.69 cfs 0.439 of Total Runoff Area = 12.010 ac Runoff Volume = 1.298 of Average Runoff Depth = 1.30" 98.67% Pervious = 11.850 ac 1.33% Impervious = 0.160 ac PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 10 Summary for Subcatchment 1 S: DA-1 Runoff = 5.66 cfs @ 12.09 hrs, Volume= 0.357 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.160 98 Paved parking, HSG B 2.170 61 >75% Grass cover, Good, HSG B 0.730 55 Woods, Good, HSG B 3.060 62 Weighted Average 2.900 94.77% Pervious Area 0.160 5.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 6 [ 5 ————————t——I- 4 N I I 0 3 LL ————————t——I- 2 1 I I I Type 11 24-h r 10yr Rainfall=5.20" Runoff Area=3.060 ac Runoff Volume=0.357 of Runoff Depth>1.40" Tc=15.8 min CN=62 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 11 Summary for Link 2L: POA 1 Inflow Area = 3.060 ac, 5.23% Impervious, Inflow Depth > 1.40" for 10yr event Inflow = 5.66 cfs @ 12.09 hrs, Volume= 0.357 of Primary = 5.66 cfs @ 12.09 hrs, Volume= 0.357 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 2L: POA 1 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 22 Summary for Link 6L: POA 3 Inflow Area = 4.170 ac, 0.00% Impervious, Inflow Depth > 3.43" for 100yr event Inflow = 19.04 cfs @ 12.09 hrs, Volume= 1.190 of Primary = 19.04 cfs @ 12.09 hrs, Volume= 1.190 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 6L: POA 3 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary PERRY RESIDENCE Time of Concentration Calculations PREDEV TOC DA-1 100 ft Overland Flow 6.39% slope 0.35 C-value 10.1 min Seelye Chart 89.0 ft S.C. Flow 8.00% slope 2.0 fps velocity 0.7 min. NEH Figure 15-4 705.0 ft Channel 17.6 ft height 5.0 min. Kirpich Chart TOC= 15.8 min. PREDEV TOC DA-2 100 ft Overland Flow 3.03% slope 0.35 C-value 11.3 min Seelye Chart 598.4 ft S.C. Flow 6.02% slope 1.6 fps velocity 6.2 min. NEH Figure 15-4 0.0 ft Channel 0.0 ft height 0.0 min. Kirpich Chart TOC= 17.5 min. PREDEV TOC DA-3 100 ft Overland Flow 3.06% slope 0.35 C-value 10.1 min Seelye Chart 743.6 ft S.C. Flow 8.79% slope 1.9 fps velocity 6.5 min. NEH Figure 15-4 0.0 ft Channel 0.0 ft height 0.0 min. Kirpich Chart TOC= 16.6 min. Post-Dev Runoff Quantity Calculations: Post-Dev Drainage Map Post-Dev Ditch Drainage Map Post-Dev HydroCAD Report VDOT LD-268 Ditch Capacity Culvert Analysis Time concentration Calculations 150 0 150 300 450 SCALE: 1 "=150' REVISED: 4-20-2020 DA-3 3.45 cc Imp=0.06 cc Turf=2.69 cc Woods=0.70 cc 17.9 min 100' STREAM BUFFER )0' STREAM BUFFER EXISTING STREAM I I I I 51-24C % PERRY, ROB F % D.B. 5084/249 , 52.92 AC RIVANNA DISTRICT USE: VACANT RESIDENTIAL LAND J POA 3- , `TOC=18.1 min � M 5.7 min DA-2A 1 4.66 cc Ex. Imp=0.09 cc -'- TREa,NEI Turf=4.06 cc 1 Woods=0.50 cc I J 91111551 DA-1 2.82 cc Imp=0.19 cc Turf=0.42 cc Woods=2.21 cc 3 State Route ut7154.3, 1 (50 R/w) 231 Perry Residence lost -Development SWM DA Map Postdev Drainage Areas Impervious Woods Managed Turf DA SF AC SF AC SF AC SF AC 1 122763.58 2.82 8094.14 0.19 96335.21 2.21 18334.23 0.42 2A 203047.80 4.66 4084.05 0.09 21907.87 0.50 177065.88 4.06 26 36380.00 0.84 12476.27 0.29 0.00 OM 23903.73 0.55 3 150072.34 3.45 2546.58 0.06 30471.39 0.70 117054.37 2.69 TOTAL 512263.72 11.76 27201.04 0.62 148714.47 3.41 336348.21 7.72 Flow Ratos(cfs) DA-2B 0.84 cc Imp=0.29 cc - Turf=0.55 cc Woods=0.0 cc ,TOC=15.8 min �. EX DIRT DRIVEWAY lair I 30-yr 100-yr 0.36 4.05 11.95 0.99 8.16 22.53 0.79 2.65 5.67 0.55 5.25 15.04 2.69 2011. 55.19 TREELINE BENCHMARK ELEV: 486.88 DA-2A & DA-213 POA-2 5.5 cc Imp=0.38 cc Turf=4.61 cc Woods=0.50 cc STREAM POA CONTRIBUTING DRAINAGE AREA FIOw Ra to Ids) # DA 1 Yr 10-yr 100-yr 1 DA-1 0.36 4.05 11.95 2 DA-2A 8: DA-26 1.78 10.81 28.20 3 DA-3 0.55 5.25 15.04 TOTAL 2.69 20.11 55.19 SIIIIPPNGINPPRING, P, C, ENGINEERING-LANDPLANNING -PROJECT MANAGEMENT 912 E HIGH ST PHONE: (434) 227-5140 CHARLOTTESVILLE, VA 22902 JUSTIN®SHIMP-ENGINEERING.COM REVISED: 04-20-2020 Perry Residence Ditch Draina6je Map Ditch Analyses: _14- 100' STREAM I _ EXISTING STREAM \ t 51-24C r�tr I !t PERRY, ROBERT F ' \ D.B. 5084/249 52.92 AC RIVANNA DISTRICT \ USE: VACANT RESIDENTIAL LAND TFJc ♦ `'��� i � I TREELINE ---------------- ��+:+X`«`• �`.� DITCH - 3 PERRY RESIDENCE Modified LD-268 Roadside and Median Ditch Design Form Side Slope n=0.05 Ditch C A CA Tc 12 110 02 Q10 A L _1 RAllowable LFVFtFVFt Velocity*Velocity 2yr 10yr Matting Type Freeboard Charnel Deplh SF AC INCR ACC "Depth 1 0.39 6189.36 0.14 0.06 1.51 5.0 5.17 6.81 7.82 10.30 3 3 4.0 3.62 0.94 EC-2 TYPE 1 0.56 1.50 2 1 0.31 1 203084.00 1 4.66 1 1.46 1 1.46 1 5.0 1 5.17 1 6.81 1 7.53 1 9.91 1 3 3 1 0.02 1 0.07 1 7.0 1 4.07 1.01 EC-3 TYPE 1 1 0.49 1 1.50 3 1 0.30 1 89096.30 1 2.05 1 0.61 1 0.61 1 5.0 1 5.17 1 6.81 1 3.17 1 4.18 1 3 1 3 1 0.03-1 0.09 1 4.0 1 3.87 1 0.87 1 EC-2 I TYPE 1 1 0.13 1 1.00 4IX 1 0.33 1 133154.17 1 3.06 1 1.01 1 1.01 1 15.8 1 3.38 1 4.67 1 3.42 1 4.73 1 2 1 2 1 0.02 1 0.06 1 4.0 1 3.39 1 0.99 1 EC-2 I TYPE 1 1 1.01 1 2.00 `2-yr Velocity calculations performed using steepest slope & 2-yr flow " 10-yr Depth calculation performed using shallowest slope & 10yr flow Culvert Analysis: PERRY RESIDENCE CulvertAnalysis Culvert Dia (in) Di (ft) DA(ac) Inlet Elev Outlet Elev Length Len 9 Slope P e rftow cfs 10- Y ( ) ft DEPTH () AVERAGE VELOCITY (fps) 1 15 1.25 4.66 480 476 59.88 0.067 8.160 0.81 8.86 2 15 1.25 3.06 474 470 52.25 0.077 4.050 0.61 9.49 150 0 150 300 450 SCALE: 1 "=150' 0.61 AC +:':S�' +`++ `'`' ++ ` i + IMPERVIOUS I / / , I 1 I 1 ✓ I / + +. + + + .++ +'. '`'+*`*`'`'``+`*++ `� .. : + + +. +- +2 + DITCH 1 s' :+:+:+:.:+:+:':a:::+:' a'.'; ' ' « :.+.+ 's; �','+ DITCH :. 0.14 AC 1 '+ •+x+:+:aX+:+:+:+:+: + + ♦ •e��.:'::rsT4 ,yy +' ,' *:: \ `\ . . ' .,.r a ..,..,,..,,, `.*'+:+: ++ :;"..;.+ + +�`' '�;;;::: ; DITCH+-`.4EX+` 3.06 AC -.tip :• .1 + , ...+.....+.+.:. . .:.:.:.:+:+ ;_.;.. I .:•:•: .. ;' a, +++ •'+ CULVERT #2?'" ��+ +: °`°W I) - --- ---- 31235 1 714. CULVERT # I 231 �F ��Ute ) STREAM K DIRT DRIVEWAY Post -Development HydroCAD Report Perry Residence 1 S 3S 4S 6S D -1 DA-2 A-213 D 1 -3 77 2L 5L 7L POA 1 POA 2 POA 3 Subcat Reach Pon Link Drainage Diagram for Post Dev- PERRY RESIDENCE Prepared by {enter your company name here}, Printed 6/4/2020 HydroCADOO 9.10 s/n 07054 © 2011 HydroCAD Software Solutions LLC POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 1yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Paae 2 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 Subcatchment 1S: DA-1 Runoff Area=2.820 ac 6.74% Impervious Runoff Depth>0.21" Tc=17.9 min CN=59 Runoff=0.36 cfs 0.048 of Link 2L: POA 1 Inflow=0.36 cfs 0.048 of Primary=0.36 cfs 0.048 of Subcatchment 3S: DA-2A Runoff Area=4.650 ac 1.94% Impervious Runoff Depth>0.26" Tc=15.7 min CN=61 Runoff=0.99 cfs 0.100 of Subcatchment 4S: DA-2113 Runoff Area=0.840 ac 34.52% Impervious Runoff Depth>0.72" Tc=15.8 min CN=74 Runoff=0.79 cfs 0.050 of Link 5L: POA 2 Inflow=1.77 cfs 0.150 of Primary=1.77 cfs 0.150 of Subcatchment 6S: DA-3 Runoff Area=3.450 ac 1.74% Impervious Runoff Depth>0.23" Tc=18.1 min CN=60 Runoff=0.55 cfs 0.066 of Link 7L: POA 3 Inflow=0.55 cfs 0.066 of Primary=0.55 cfs 0.066 of Total Runoff Area = 11.760 ac Runoff Volume = 0.265 of Average Runoff Depth = 0.27" 94.64% Pervious = 11.130 ac 5.36% Impervious = 0.630 ac POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1 S: DA-1 Runoff = 0.36 cfs @ 12.18 hrs, Volume= 0.048 af, Depth> 0.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.190 98 Paved parking, HSG B 0.420 61 >75% Grass cover, Good, HSG B 2.210 55 Woods, Good, HSG B 2.820 59 Weighted Average 2.630 93.26% Pervious Area 0.190 6.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 0.4 - - - - - + - -I - - I- - - + - -I - - I- - - - -I - - ■Runoff 0.38 y- I�-p-� �n-A�{, -I - 0.34 - ---I---+------b--�A-'�---ri 0.32 - t - - - - �1a�-r�fQJ�2. 0.3 rt -1 - I--RunbffArec-f= 2.82G-1ac 0.28 --r - I -- -r--rt--I--I--r-rt--I-- 0.26-I F--RtlnoffiV(Aum"- -.N81 of y 0.24 11 - - - 1 0.22 Rut„^f# nne' ��1 A. '- li - - f Dj �� 0 0.2 1 I 1 - _1`71�1n- LL 0.18 1 ---1--1-- - --- 0.16 0.14 - - _I - _ _ - - _I _ - I- - - -N__-_ 0.12 0.1 1-- -- --1- - - --- 0.08 0.06 1 - - - - - I - - - - - - - - - - - - nnA L -i ------L -------L----I- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 4 Summary for Link 2L: POA 1 Inflow Area = 2.820 ac, 6.74% Impervious, Inflow Depth > 0.21" for 1yr event Inflow = 0.36 cfs @ 12.18 hrs, Volume= 0.048 of Primary = 0.36 cfs @ 12.18 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 Link 2L: POA 1 Hydrograph L — — — ■ Inflow 0.4 i L — — — — o.as �r5 — + — — ❑ Primary 0.38 i — fi — — —I — — — — 1— - osscrs rt1nfl8w1-Pie"--.829 -ae 0.36 0.34 i i 0.3 i _ I — — — — 1 1 — — — 028 i _ — — —I — —I— — I— — — —I— — I— — — — —I — 0.26 0.24 i 0.22 i L I I L 1—- 0.2 i — 4- — — �—°° 0.18 i — 4- — -4 — —1 — —1— — 1— — -4 — —1 — —1— — 1— —- 0.16 i — t — -t — —1 — - — —1 — —1— t- — t — - 0.14 i fi —I — - — —1 1— - — — — — 1 — — 0.12 0.1 i i — r _ — 0.08 i — — 1 1 • _///� 1 1 POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 3S: DA-2A Runoff = 0.99 cfs @ 12.14 hrs, Volume= 0.100 af, Depth> 0.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.090 98 Paved parking, HSG B 4.060 61 >75% Grass cover, Good, HSG B 0.500 55 Woods, Good, HSG B 4.650 61 Weighted Average 4.560 98.06% Pervious Area 0.090 1.94% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph I I I I I I I I I I I I— F - 0.99 cfs T _ r F _ ' Type II 24*hr 1yr Rainfall 2.04" Runoff Area=4.650'ac Runoffll Volllume=0.1100 of Runoff Depth;>0.26" LL Tc=151.7 min CN=61 I I I I I I I I I I I I I I I I I I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr l yr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 6 Summary for Subcatchment 4S: DA-213 Runoff = 0.79 cfs @ 12.10 hrs, Volume= 0.050 af, Depth> 0.72" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type 11 24-hr 1 yr Rainfall=2.84" Area (ac) CN Description 0.290 98 Paved parking, HSG B 0.550 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.840 74 Weighted Average 0.550 65.48% Pervious Area 0.290 34.52% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 4S: DA-213 0.85 Hydrograph ■Runoff I 0.8 T--1--1--T-T 1 0.79cfs +-I--1--r- + -I- T--1 1 T T 1 -- rt- iTyW1-24-�hr1yr- 0.75 0.7 a12�, 7 +-+--I--+ + - -- +-+ j 0.65 + - A - - I - - � - - - - - ff /y Run6l et 0.84pFV1QV 0.6 0.55 +---I--L- + - 1 - -I- - L - j 1-1--L--- 1 - >Runoffluolume--0-0501 af w ., 5 1_ I -I - -- - - -_ I1 R_ u_Wf t_h 0_ 1_I 2 0.45 _1 _D_eI„ LL 0.4 1 1 1 - - --Tc`15.8-niInrr_- 1 0.35 1 1 1 1 1 11+ 1 I P N =1 74- 0.3 0.25 -T--1 -1 --T T 0.2 —+— -�--I 0.15 - + 0.1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 7 Summary for Link 5L: POA 2 Inflow Area = 5.490 ac, 6.92% Impervious, Inflow Depth > 0.33" for 1yr event Inflow = 1.77 cfs @ 12.12 hrs, Volume= 0.150 of Primary = 1.77 cfs @ 12.12 hrs, Volume= 0.150 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 5L: POA 2 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 8 Summary for Subcatchment 6S: DA-3 Runoff = 0.55 cfs @ 12.18 hrs, Volume= 0.066 af, Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1yr Rainfall=2.84" Area (ac) CN Description 0.060 98 Paved parking, HSG B 2.690 61 >75% Grass cover, Good, HSG B 0.700 55 Woods, Good, HSG B 3.450 60 Weighted Average 3.390 98.26% Pervious Area 0.060 1.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 Direct Entry, Subcatchment 6S: DA-3 Hydrograph 0.6 0.55 cfs 0.55 — — — — — — — — — — 0.5 0.45 0.4 — L — — — — — — L — — — y 0.35 1 1 0 0.3 LL 0.25 0.2 .. —————————————— — 0.15 — 4 — — — — — — — — — — — — 0.1 1 1 Type 11 24-h r 1 yr Rainfall=2.84" Runoff Area=3.450 ac Runoff Volume=0.066 of Runoff Depth>0.23" Tc=18.1 min CN=60 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 9 Summary for Link 7L: POA 3 Inflow Area = 3.450 ac, 1.74% Impervious, Inflow Depth > 0.23" for 1yr event Inflow = 0.55 cfs @ 12.18 hrs, Volume= 0.066 of Primary = 0.55 cfs @ 12.18 hrs, Volume= 0.066 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 7L: POA 3 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 10 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 Subcatchment 1S: DA-1 Runoff Area=2.820 ac 6.74% Impervious Runoff Depth>1.20" Tc=17.9 min CN=59 Runoff=4.05 cfs 0.281 of Link 2L: POA 1 Inflow=4.05 cfs 0.281 of Primary=4.05 cfs 0.281 of Subcatchment 3S: DA-2A Runoff Area=4.650 ac 1.94% Impervious Runoff Depth>1.33" Tc=15.7 min CN=61 Runoff=8.16 cfs 0.516 of Subcatchment 4S: DA-2113 Runoff Area=0.840 ac 34.52% Impervious Runoff Depth>2.31" Tc=15.8 min CN=74 Runoff=2.65 cfs 0.162 of Link 5L: POA 2 Inflow=10.80 cfs 0.677 of Primary=10.80 cfs 0.677 of Subcatchment 6S: DA-3 Runoff Area=3.450 ac 1.74% Impervious Runoff Depth>1.26" Tc=18.1 min CN=60 Runoff=5.25 cfs 0.363 of Link 7L: POA 3 Inflow=5.25 cfs 0.363 of Primary=5.25 cfs 0.363 of Total Runoff Area = 11.760 ac Runoff Volume = 1.321 of Average Runoff Depth = 1.35" 94.64% Pervious = 11.130 ac 5.36% Impervious = 0.630 ac POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 11 Summary for Subcatchment 1 S: DA-1 Runoff = 4.05 cfs @ 12.12 hrs, Volume= 0.281 af, Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.190 98 Paved parking, HSG B 0.420 61 >75% Grass cover, Good, HSG B 2.210 55 Woods, Good, HSG B 2.820 59 Weighted Average 2.630 93.26% Pervious Area 0.190 6.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph I � I 4 I I I I 3 I I I I I I I I I I I y I I I I I I I _o I I I I I I 1 I I t11t-1 I I I I I I I I I I I I I I Type 11 24-h r 10yr Rainfall=5.20" Runoff Area=2.820 ac Runoff Volume=0.281 of Runoff Depth>1.20" Tc=17.9 min CN=59 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 12 Summary for Link 2L: POA 1 Inflow Area = 2.820 ac, 6.74% Impervious, Inflow Depth > 1.20" for 10yr event Inflow = 4.05 cfs @ 12.12 hrs, Volume= 0.281 of Primary = 4.05 cfs @ 12.12 hrs, Volume= 0.281 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 2L: POA 1 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 13 Summary for Subcatchment 3S: DA-2A Runoff = 8.16 cfs @ 12.10 hrs, Volume= 0.516 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 10yr Rainfall=5.20" Area (ac) CN Description 0.090 98 Paved parking, HSG B 4.060 61 >75% Grass cover, Good, HSG B 0.500 55 Woods, Good, HSG B 4.650 61 Weighted Average 4.560 98.06% Pervious Area 0.090 1.94% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph 9 8 I I I I I I I 7 ' - 6 —— — — ——— — —-' H I I I I I I I 5 I I I I I I o I I I I I I LL 4 -T I I F - 1 3 2 1 I I I I I I I I I Type II Q4-hr 10yr - kai6fal11-5-�0" - Hu nb#f-Aree1-4.650 'ao I I I I I I i Runoffs Voliume=0.5161 of Runoff Depth;>1.33" Tc-15'.7 afin I I I I I A' —Ic I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 14 Summary for Subcatchment 4S: DA-213 Runoff = 2.65 cfs @ 12.08 hrs, Volume= 0.162 af, Depth> 2.31" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.290 98 Paved parking, HSG B 0.550 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.840 74 Weighted Average 0.550 65.48% Pervious Area 0.290 34.52% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 4S: DA-213 Hydrograph i 1 1 1 I I I I I ❑Runoff 2.65 fs Type 11 24-h r 10yr Rainfall 5.20" -Runbff-Area -0-.840'ac 2 1 1 1 1 1 1 Runoff) Vollume=0.1162 of Runoff Depth;>2.31" LL 1 1 Tc=151.8 min 1 —-CN=174 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 15 Summary for Link 5L: POA 2 Inflow Area = 5.490 ac, 6.92% Impervious, Inflow Depth > 1.48" for 10yr event Inflow = 10.80 cfs @ 12.09 hrs, Volume= 0.677 of Primary = 10.80 cfs @ 12.09 hrs, Volume= 0.677 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs I N U 3 0 LL Link 5L: POA 2 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 16 Summary for Subcatchment 6S: DA-3 Runoff = 5.25 cfs @ 12.12 hrs, Volume= 0.363 af, Depth> 1.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfall=5.20" Area (ac) CN Description 0.060 98 Paved parking, HSG B 2.690 61 >75% Grass cover, Good, HSG B 0.700 55 Woods, Good, HSG B 3.450 60 Weighted Average 3.390 98.26% Pervious Area 0.060 1.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 Direct Entry, Subcatchment 6S: DA-3 Hydrograph I I I 4 w I I I I I I I I I I I I I V 3 o I I I I LL � I 1 I I I ❑Runoff - - (Type A -24-h r 10yr kainfallr5.�0" Runoff Area =-3:450'ao I Runoffll Vollume=0.1363 of Runoff DgPth�A-.*" I I Tc1-181.1 Min I I I -CN-60 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 10yr Rainfall=5.20" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 17 Summary for Link 7L: POA 3 Inflow Area = 3.450 ac, 1.74% Impervious, Inflow Depth > 1.26" for 10yr event Inflow = 5.25 cfs @ 12.12 hrs, Volume= 0.363 of Primary = 5.25 cfs @ 12.12 hrs, Volume= 0.363 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 7L: POA 3 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Paae 18 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 Subcatchment 1S: DA-1 Runoff Area=2.820 ac 6.74% Impervious Runoff Depth>3.31" Tc=17.9 min CN=59 Runoff=11.95 cfs 0.778 of Link 2L: POA 1 Inflow=11.95 cfs 0.778 of Primary=11.95 cfs 0.778 of Subcatchment 3S: DA-2A Runoff Area=4.650 ac 1.94% Impervious Runoff Depth>3.54" Tc=15.7 min CN=61 Runoff=22.53 cfs 1.372 of Subcatchment 4S: DA-2113 Runoff Area=0.840 ac 34.52% Impervious Runoff Depth>5.04" Tc=15.8 min CN=74 Runoff=5.67 cfs 0.353 of Link 5L: POA 2 Inflow=28.19 cfs 1.724 of Primary=28.19 cfs 1.724 of Subcatchment 6S: DA-3 Runoff Area=3.450 ac 1.74% Impervious Runoff Depth>3.42" Tc=18.1 min CN=60 Runoff=15.04 cfs 0.984 of Link 7L: POA 3 Inflow=15.04 cfs 0.984 of Primary=15.04 cfs 0.984 of Total Runoff Area = 11.760 ac Runoff Volume = 3.487 of Average Runoff Depth = 3.56" 94.64% Pervious = 11.130 ac 5.36% Impervious = 0.630 ac POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 19 Summary for Subcatchment 1 S: DA-1 Runoff = 11.95 cfs @ 12.11 hrs, Volume= 0.778 af, Depth> 3.31" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.190 98 Paved parking, HSG B 0.420 61 >75% Grass cover, Good, HSG B 2.210 55 Woods, Good, HSG B 2.820 59 Weighted Average 2.630 93.26% Pervious Area 0.190 6.74% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.9 Direct Entry, Subcatchment 1 S: DA-1 Hydrograph 13 1 1 1 1 1 — T — —1 — — — — T 11.95 cf: 12 —1—-1——I——L———-1- 11 I I I 10 9 — — —1 — — 8 1— - t 7 ——-1—-1———— -—-1— 6 �` — + 5 1 3 2 — T — — — — F T — - 1 I I I I T 1 - -1 TypeLlf 24--hr 100y-r - �tainfafl - . " - -Runoff Area-2:820sac I Runoff Norume=WMi al - 4 - l�ynof Dgpth;1>1 1" --- - I TC-171.9Min — ————+— ———I— —t— _ _C_N_-159_ I I I I I i 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 20 Summary for Link 2L: POA 1 Inflow Area = 2.820 ac, 6.74% Impervious, Inflow Depth > 3.31" for 100yr event Inflow = 11.95 cfs @ 12.11 hrs, Volume= 0.778 of Primary = 11.95 cfs @ 12.11 hrs, Volume= 0.778 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs i Link 2L: POA 1 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 21 Summary for Subcatchment 3S: DA-2A Runoff = 22.53 cfs @ 12.08 hrs, Volume= 1.372 af, Depth> 3.54" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.090 98 Paved parking, HSG B 4.060 61 >75% Grass cover, Good, HSG B 0.500 55 Woods, Good, HSG B 4.650 61 Weighted Average 4.560 98.06% Pervious Area 0.090 1.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph - - - - - - - - - - - t t I - - - - - - - - - 25 24 T T T 7 T T 22 1 — — + — — — — — L — 4- — — E5S3 cfs — 1 — — — — L — 1 — — — — — — L — � I - -Types 1U 24-h rl l OGyr 21 20 -T----1-- -T--1- - 1 7--1--r --I-�-A-I-Q- a-i IQNw q0-r 19 18 -----1--I � - 1 I 4- --- A 1 - ---1---------r--- - 4 -Runbff Arezi= F-65fl tc 17 t--1--I- fi ' 1 1 -1 I 1 1 I 1 r--t- 1 +Ig t- 1 Runoffl�olume=1-37 15 14 - ra cY �"Ipt�"14tr 13 + 1 I t -1 I 11 -1 - - - - -1 ' 1 Tc'�1511Min 10 9 -1--1--1--L----1- + 1 1 - � 1 1--1--L-1--1--�I+-w'--LG- - 4 I + I GN--61 8 7 - T - - - - -1 - - 1- - -7 - - - - - - - -1 1- - - - 7 - -1 - - T - T - -1 - -1- - T - - - - - - - - - - - - - - - - - 6II-II 5 ---1--1-- - -- --1---4---1--I--T- 4 ^ - - - - -1- - - - - - - - - - - - - - - - - - - - - 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 22 Summary for Subcatchment 4S: DA-213 Runoff = 5.67 cfs @ 12.08 hrs, Volume= 0.353 af, Depth> 5.04" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.290 98 Paved parking, HSG B 0.550 61 >75% Grass cover, Good, HSG B 0.000 55 Woods, Good, HSG B 0.840 74 Weighted Average 0.550 65.48% Pervious Area 0.290 34.52% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 15.8 Direct Entry, Subcatchment 4S: DA-213 Hydrograph I I I I 6 5.67 cfs Type II 24-hrl 100yr 5 air�fall8.6" Runoff Areal=0.840'ac 4 1 1 1 1 1 1 1 Runoff) Vollume=0.1353 of y 1 1 R-unoff Depth;>5.04" ° 3 1 1 1 Tc=151.8 min LL - - - -CN=74 2 a _1 1 I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 23 Summary for Link 5L: POA 2 Inflow Area = 5.490 ac, 6.92% Impervious, Inflow Depth > 3.77" for 100yr event Inflow = 28.19 cfs @ 12.08 hrs, Volume= 1.724 of Primary = 28.19 cfs @ 12.08 hrs, Volume= 1.724 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs N U 3 0 LL Link 5L: POA 2 Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Inflow ❑ Primary POST DEV Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 ©2011 HvdroCAD Software Solutions LLC Paae 24 Summary for Subcatchment 6S: DA-3 Runoff = 15.04 cfs @ 12.11 hrs, Volume= 0.984 af, Depth> 3.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100yr Rainfall=8.56" Area (ac) CN Description 0.060 98 Paved parking, HSG B 2.690 61 >75% Grass cover, Good, HSG B 0.700 55 Woods, Good, HSG B 3.450 60 Weighted Average 3.390 98.26% Pervious Area 0.060 1.74% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 18.1 Direct Entry, Subcatchment 6S: DA-3 Hydrograph I I I I T T I I I I 16 n—,I�— 15—4—-1—-1— 4- A I-——Type1124-hr104yr 14 _ L _ —1 _ _ 1— _ L — J — —1— —1 _ _ L _ H 13 1 0air�faw-46- — — — — — — — — — — — — — — — — 12-!-----------'--%nb#Arezi=3.450hc 11 I I I I I I I I I I I I I 1- -1- - - - -1 1 Runaffl otume_-0�9$4� of 10 1— R'' n f f _ p _ 9-1— rt — —1 — — — � -11 � —1 — J �"oY D'''Ipth�3-0;r + — —I — — I— — t - — —I 0 8 --1--- LL Ta-1$1.I in 7 1 1 ---------------------N=i6 5 ———-1—-1—- - ———.— — 41—— — T 1 1 — 3 2 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff POST DEV Post Dev - PERRY RESIDENCE Type 1124-hr 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD® 9.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 25 Summary for Link 7L: POA 3 Inflow Area = 3.450 ac, 1.74% Impervious, Inflow Depth > 3.42" for 100yr event Inflow = 15.04 cfs @ 12.11 hrs, Volume= 0.984 of Primary = 15.04 cfs @ 12.11 hrs, Volume= 0.984 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 7L: POA 3 Hydrograph ■ Inflow ■ Primary 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PERRY RESIDENCE Modified LD-268 Roadside and Median Ditch Design Form Side Slope Min. Max n=0.05 Ditch C A CA Tc 12 110 C!2 Q10 1 L :1 R Slope Slope Allowable Velocity 2-yr 10-yr Matting Type =FreeboardChannel SF AC INCR ACC Ft/Ft Ft/Ft *Velocity **Depth 1 0.32 36590.40 0.84 0.27 1.72 5.0 5.17 6.81 8.90 11.72 3 3 0.05 0.05 4.0 3.62 0.94 EC-2 TYPE 1 2 0.31 203084.00 4.66 1.46 1.46 5.0 5.17 6.81 7.53 9.91 3 3 0.02 0.07 7.0 4.07 1.01 EC-3 TYPE 1 0.49 1.50 3 0.30 150282.00 3.45 1.04 1.04 5.0 5.17 6.81 5.35 7.05 3 3 0.03 0.09 4.0 3.87 0.87 EC-2 TYPE 1 0.13 1.00 4 EX 0.33 133154.17 3.06 1.01 1.01 15.8 3.38 4.67 3.42 4.73 2 2 0.02 0.06 4.0 3.39 0.99 EC-2 TYPE 1 1.01 2.00 *2-yr Velocity calculations performed using steepest slope & 2-yr flow ** 10-yr Depth calculation performed using shallowest slope & 10-yr flow Outlet Protection Details Culvert Area (ac) Flow (cfs) Dia. (in) Do (ft) 3Do (ft) La (ft) W (ft) 1 2.82 4.05 15 1.25 3.75 9 10.25 2 4.66 8.16 15 1.25 3.75 10 11.25 PERRY RESIDENCE Time of Concentration Calculations POSTDEV TOC TO DET. DA-1 100 ft Overland Flow 3.92% slope 0.35 C-value 11.1 min Seelye Chart 152.88 ft S.C. Flow 8.25% slope 2.0 fps velocity 1.3 min. NEH Figure 15-4 750.45 ft Channel 17.6 ft height 5.5 min. Kirpich Chart TOC= 17.9 min. POSTDEV TOC TO DET. DA-2 100 ft Overland Flow 3.51% slope 0.35 C-value 11.0 min Seelye Chart 465.5 ft S.C. Flow 6.01% slope 1.7 fps velocity 4.7 min. NEH Figure 15-4 0.0 ft Channel 0.0 ft height 0.0 min. Kirpich Chart TOC= 15.7 min. POSTDEV TOC TO DET. DA-3 100 ft Overland Flow 1.56% slope 0.35 C-value 13.0 min Seelye Chart 333.2 ft S.C. Flow 8.40% slope 2.0 fps velocity 2.8 min. NEH Figure 15-4 0.0 ft Channel 0.0 ft height 0.0 min. Kirpich Chart TOC= 15.8 min. POSTDEV TOC TO DET. DA-4 100 ft Overland Flow 3.98% slope 0.35 C-value 10.9 min Seelye Chart 700.4 ft S.C. Flow 7.57% slope 1.9 fps velocity 6.1 min. NEH Figure 15-4 102.6 ft Channel 4.0 ft height 1.1 min. Kirpich Chart TOC= 18.1 min. Independent Reports: Excerpt from NRCS Soils Report NOAA Precipitation Report 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 January 14, 2020 Custom Soil Resource Report Soil Map 'a M Ik Ik 742000 742100 742200 742300 742400 742500 742600 742700 742800 742900 743000 743100 743200 743300 38' 725" N g e v g c a 38' 6 55" N 742000 742100 742200 742300 742400 742500 742600 742700 742800 742900 743000 743100 743200 743300 3 3 Map Scale: 1:6,550 if printed on A landscape (11" x 8.5") sheet. M Meters N 0 50 100 200 300 rat 0 300 600 1200 1800 Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 17N WGSS84 9 38° 725" N 8 K e v v 38° 655" N Custom Soil Resource Report Albemarle County, Virginia 12C—Catoctin silt loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2xxxk 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 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: 7 to 15 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural 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 storage in profile: 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 14 Custom Soil Resource Report 19C—Minnieville loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2v7hr 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: Farmland of statewide importance Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Minnieville 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 acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No 15 Custom Soil Resource Report 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. 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 Natural 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 storage in profile: 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 16 Custom Soil Resource Report 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 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: 7 to 15 percent Depth to restrictive feature: More than 80 inches Natural 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 storage in profile: 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 17 Custom Soil Resource Report 2513—Dyke silt loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2xxxt 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 Dyke and similar soils: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Dyke Setting Landform: Fans Landform position (two-dimensional): Footslope Landform position (three-dimensional): Base slope Down -slope shape: Concave Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile Ap - 0 to 8 inches: silt 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 Natural 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 storage in profile: High (about 9.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 18 Custom Soil Resource Report 51 C—Bugley channery silt loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2v7jh 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 Bugley and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Bugley 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 serecite schist Typical profile Ap - 0 to 6 inches: channery silt loam Bw - 6 to 18 inches: very channery silt loam R - 18 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 10 to 20 inches to lithic bedrock Natural drainage class: Somewhat excessively 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 storage in profile: Very low (about 2.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: D Hydric soil rating: No 19 Custom Soil Resource Report 5713—Mount Lucas silt loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2xxyf 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 Map Unit Composition Mount /ucas and similar soils: 80 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Mount Lucas Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum and alluvium weathered from greenstone Typical profile A - 0 to 10 inches: silt loam Bt - 10 to 48 inches: silty clay loam C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 48 to 80 inches to lithic bedrock Natural drainage class: Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.57 in/hr) Depth to water table: About 12 to 24 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 8.3 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C/D Hydric soil rating: No Minor Components Delila Percent of map unit: 5 percent 20 Custom Soil Resource Report Landform: Drainageways Landform position (two-dimensional): Footslope Landform position (three-dimensional): Head slope, tread Down -slope shape: Concave Across -slope shape: Convex Hydric soil rating: Yes 6213—Buffstat silt loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2v7jt 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 Buffstat and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Buffstat 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 serecite schist Typical profile Ap - 0 to 8 inches: silt loam Bt - 8 to 39 inches: silty clay loam C - 39 to 50 inches: channery silt loam R - 50 to 79 inches: bedrock Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 40 to 60 inches to paralithic bedrock Natural 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 storage in profile: Moderate (about 8.3 inches) Interpretive groups Land capability classification (irrigated): None specified 21 Custom Soil Resource Report Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 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: I nterfluves 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 Natural 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 storage in profile: 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 22 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 Natural 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 storage in profile: 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 23 Custom Soil Resource Report 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 transects 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 Natural 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: Occasional Frequency of ponding: None Available water storage in profile: 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 24 2/7/2020 Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Gordonsville, Virginia, USA* ' Latitude: 38.1185°, Longitude:-78.2308° Elevation: 492.93 ft** " source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, 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)1 Average recurrence interval (years) Duration 1 ���������� 2 5 10 25 50 100 200 500 1000 0.351 0.418 0.490 0.553 0.623 0.678 0.730 0.779 IF 0.838 0.887 5-min (0.317-0.389) (0.378-0.462) (0.443-0.541) (0.498-0.611) (0.559-0.686) (0.605-0.746) (0.648-0.803) (0.686-0.856) (0.732-0.925) 0.669 0.785 0.885 0.993 1.08 1.16 1.24 1.33 (0.768-0.980) 0.561 1.40 1 0-min (0.506-0.621) (0.605-0.739) (0.709-0.867) (0.796-0.977) (0.890-1.09) (0.964-1.19) 1 (1.03-1.27) 1 (1.09-1.36) 1 (1.16-1.46) 0.841 0.993 IF 1.12 1.26 1.37 1.47 1.56 1.67 1 (1.21-1.54) 0.701 1.75 1 5-min (0.632-0.776) (0.760-0.930) (0.897-1.10) (1.01-1.24) (1.13-1.39) (1.22-1.50) (1.30-1.61) 1 (1.37-1.71) (1.46-1.84) 1 (1.52-1.94) 0.962 1.16 1.41 1.62 1.87 2.06 2.25 2.42 2.66 2.84 30-min (0.867-1.06) (1.05-1.28) (1.27-1.56) (1.46-1.79) (1.67-2.05) (1.84-2.27) (1.99-2.47) (2.14-2.67) 11 (2.32-2.93) 1.46 1.81 2.11 2.48 F 2.79 F 3.10 3.40 F 3.81 1 (2.46-3.14) 1.20 4.14 60-min (1.08-1.33) (1.32-1.61) (1.63-2.00) (1.90-2.33) 1 (2.23-2.73 2.49-3.07) (2.75-3.40) (3.00-3.74 ( ) 11 (3.33-4.20) 1 (3.59-4.58) 1.43 1.74 2.17 2.56 3.05 3.46 3.89 4.33 4.94 5.46 2-hr (1.28-1.61) (1.55-1.95) (1.93-2.43) (2.27-2.86) 1 (2.69-3.41) 11 (3.04-3.87) (3.39-4.34) 1 (3.75-4.83) 1 (4.23-5.52) 1.89 2.36 2.78 3.31 3.77 4.23 4.72 5.39 1 (4.63-6.11) 1.56 5.96 3-hr (1.38 -1.78) (1.67-2.15) (2.08-2.69) (2.44-3.16) (2.89-3.76) (3.27-4.26) (3.65 4.79) (4.04-5.35) (4.56-6.11) 2.36 2.93 3.45 4.15 4.76 5.40 6.09 IF 7.06 (4.99-6.76) 1.96 7.91 6-hr (1.73-2.25) (2.07-2.71) (2.56-3.36) (3.02-3.96) (3.60-4.76) (4.10-5.44) (4.61-6.17) (5.14-6.95) 1 (5.87-8.06) (6.49-9.03) 2.43 2.93 3.65 4.33 5.26 6.10 7.00 7.99 9.43 10.7 12-hr (2.15-2.80) 1 (2.59-3.36) (3.21-4.18) (3.79-4.95) (4.58-6.00) (5.25-6.94) (5.95-7.95) (6.71-9.05) 1 (7.77-10.7) 3.44 4.39 5.20 6.40 7.43 8.56 9.81 11.7 1 (8.71-12.2) 2.84 13.2 24-hr (2.55-3.20) 1 (3.09-3.87) (3.94-4.95) (4.65-5.84) 1 (5.68-7.18) (6.55-8.30) 1 (7.48-9.55) 1 (8.49-10.9) 1 (9.95-13.0) 4.04 5.14 6.04 7.35 8.45 9.64 10.9 12.8 1 (11.2-14.7) 3.34 14.4 2-day (3.02-3.72) 1 (3.66-4.50) 1 (4.64-5.72) (5.44-6.71) 1 (6.59-8.14) (7.52-9.35) (8.53-10.7) (9.60-12.1) (11.1-14.2) 4.30 5.46 6.42 7.81 8.97 10.2 11.6 13.6 (12.3-16.0) 3.55 15.2 3-day (3.23-3.93) 1 (3.91-4.76) 1 (4.96-6.04) (5.81-7.09) 1 (7.03-8.61) (8.03-9.89) (9.10-11.3) (10.2-12.8) (11.8-15.0) (13.1-16.8) 3.76 4.55 5.78 6.80 8.26 7 F 9.49 00.8 12.3 F 14.3 16.1 4-day (3.43-4.15) 1 (4.15-5.01) 1 (5.27-6.37) (6.18-7.47) 1 (7.48-9.07) 1 (8.54-10.4) (9.67-11.9) (10.9-13.5) (12.6-15.8) 5.25 6.57 7.65 .2 90 10.5 11.9 13.4 15.5 (13.9-17.7) 4.37 17.3 7-day (4.00-4.79) 1 (4.81-5.76) 1 (6.00-7.19) (6.98-8.37)J (8.36-10.1) 1 (9.48-11.5) (10.7 13.0) (11.9-14.6) (13.6-17.0) 5.95 7.35 8.48 10.1 11.4 12.8 14.3 16.3 (15.0-19.0) 4.96 18.0 10-day (4.56-5.39) 1 (5.47-6.47) 1 (6.75-7.98) 1 (7.78-9.21) 1 (9.22-10.9) 11 (10.4-12.4) (11.6-13.9) (12.8-15.5) 1 (14.5-17.8) 7.82 9.45 10.7 12.5 13.8 15.2 16.7 18.6 1 (15.9-19.7) 6.56 20.1 20-day (6.12-7.06) (7.30-8.41) 1 (8.80-10.2) (9.97-11.5) (11.6-13.4) (12.8-14.8) (14.016.3) (15.2-17.9) 1 (16.9-20.0) (18.1-21.7) 8.06 9.55 IF 11.3 12.6 14.4 15.7 17.0 18.2 IF 19.9 21.2 30-day (7 .55-8.61) (8.95-10.2) 1 (10.6-12.1) (11.8-13.5) (13.4-15.3) (14.6-16.7) (15.7-18.1) (16.9-19.5) 1 (18.3-21.3) (19.3-22.7) 10.1 11.9 13.9 15.4 17.4 18.8 20.2 21.5 IF 23.2 24.4 45-day (9.50-10.7) 1 (11.2-12.7) 11 (13.1-14.8) 1 (14.5-16.4) 1 (16.3-18.4) 11 (17.6-19.9) 1 (18.9-21.4) 1 (20.0-22.9) 1 (21.5-24.7) 1 (22.6-26.1) 11.9 14.0 16.1 IF 17.7 19.8 21.3 22.724.0) 24.1 25.8 27.0 60-day (11.2-12.6) (13.2-14.8) (15.2-17.0) (16.7-18.7) (18.6-20.9) (20.0-22.5) (21.3 (22.5-25.5) (24.1-27.4) (25.1-28.8) 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 https:Hhdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=38.1185&Ion=-78.2308&data=depth&units=english&series=pds#table 1/4