Loading...
HomeMy WebLinkAboutWPO202000015 Calculations 2020-08-06SHIMP ENGINEERING, P.C. Design Focused Engineering August 6th, 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 9VAC25-870-55. This project will disturb an area of 3.58 acres. 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-213 0.79 7.43 1.59 10.33 3 0.71 6.69 0.55 5.25 If you have any questions please feel free to contact me via e-mail at michael@shimp-engineering.com or Justin Shimp at justin@shimp-engineering.com or by telephone at 434-227-5140. Sincerely, Michael Chandler Shimp Engineering, P.0 APPROVED by the Albemarle County CommunWj6eeyT8� 8epartment Date File WP0202000015 Contents: 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 Pre -Development Calculations: Pre-Dev Drainage Map Pre-Dev HydroCAD Report Time concentration Calculations REVISED: 04-20-2020 DA-1 3.06 cc Imp=0.16 cc Turf=2.17 cc Woods=0.73 cc 300 450 100_STREQ BUFFER 100' EXISTING STREAM STREAM BUFF -ER \ PERRY, ROBERT F D.B. 5084/249 52.92 AC ..� RIVANNA DISTRICT USE: ykANT RESIDENTIAL LAND ---------- 16.6 min DA-3 - OA 3 __ 4.17 cc PRE Imp=0.0 cc k*,.,:. Turf=3.41 cc /' ` 5.8 min j.... Woods=0.76 cc - /1 ...rrrr: rrrrrcrrrcrrr::cr: Stote Rout7rej ' (soo,ute 231 OA 1 PRE Predev Drainage Area Impervious Woods Managed Turf DA SF AC SF AC SF AC SF AC 1 133154.17 3.06 6833.55 0.16 3186A26 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 14852537 3.41 TOTAL 1 523365.33 12.01 6833.55 0.16 95202.01 2.19 421329.77 9.87 I I� STREAM K DIRT DRIVEWAY 0-- Flow Rates Ictsl 1-yr 10-yr 100-yr 0.78 0.79 5.66 7.43 15.25 21.22 0.71 &69 19.04 2.28 19.78 55.51 Pre -Development HydroCAD Report Perry Residence 1S 3S 5S D-1 D-2 D-3 2L 4L 6L POA 1 POA 2 POA 3 Subcat Reach On Link Drainage Diagram for Pre Dev - PERRY RESIDENCE Prepared by {enter your company name here}, Printed 6/4/2020 HydroCAD® 9.10 stn 07054 0 2011 HydroCAD Software Solutions LLC PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD09.10 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=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 1124-hr 1 yr Rainfall=2.84" Prepared by {enter your company name here) Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 02011 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 II 24-hr 1yr 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 1S: DA-1 Hydrograph �I r--- 085 _--T----r---T----r___T----T--__�----T--------r----r---r--- 0 8 0.71 cfs 0.75 T-- e l 2A 0.7----'I li ---11- ---11-- r 11- - i �taifa41 0.65 --rl- r---, 1 ---Aunbfif-Ares=3 os -------- 0.55 11 - �1----'1r --- �1----1 - -- -JI p ---Ru Po F'iVlilpme=-O Runoff a 0.5 0.45 11 1 -I111-RIJh_O0-De pf e 0.4 --- -- --- ' 0.35 0.3 11 11 11 11 11 11 11 11 11 0.25 -T __ -T 02 _y _r _r 0.15 0.1 0.05 Time (hours) it #yr= 9 92111- ■ RunoH Pre Dev - PERRY name Summary for Link 2L: POA 1 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 ' ------ -r---I - -- 1--------I--------r---i I I - ---� --- ------------T -- - I I 1 ■ Inflow r____I____r___�____I____r___________r___r____I____r___1____r___ ■Primary 0.85 1 1 o.iacis 1 1 1 0.6 ---7----1----r-------;--- o. a [ow Aire=i3.0� // -----------~---J----1----ti -I-lnf --- - 0.75 1 1 1 1 1 07 _L _J _I _L _I _L _J _I _1 _J _L 065 I____I I____I I____I 0'6 ' , ________ ___ ___I I I I I I I ___I ___I ___ ___I ___ ___ I I I I I I I 0.55 -I -I -I -I -I -I -I -I -I -I pj 0.5 " 0.45 1 1 1 1 0 0.4 1 1 1 1 , I _I _1 _J _L Oar 1 1 0.3 1 1 I I I 1 1 0.25 I I I 1 1 I 1 1 0.2 0.15 / 1 1 0.1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" name 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 II 24-hr 1yr Rainfall=2.84" Area (ac) CN Description Printed 6/4/2020 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 Description 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph 0.85 0-8 ors ais 0J5 Type 1(24-,hrJyr ---,----r---,----r---,-- --r r r r--- -r -T IRa nfall_ -84"- 0.65 0.5 -tau rrbff-ATect:A-7ftU'ac- --- L-------�--- ------ --L-- 1----L---1----L----I----L--- 0.5s Aunoff ValpmW-0.09I of 1 0.5 --- tunoffDe th>07.23" 30.45 ---T----T---T----T---T------------T----�------------T--- 0.4 ------ Tc=i7.5-Min- 0.35 0.3 YN=NV --------- -------- --- 0.25 0.2--------------------------t-- --- "----- "----f--------f--- 0.15 0.1 n ns - 10 11 12 13 Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 4L: POA 2 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 ■ Mim 685 1 0MCis ___----L-------L---J----L--_ I I I I I ■ Pfimary --'--- o.�e �i� -' 1nf�owll Aroa=4:7 Q 41c - 08 0.75 I I I I I I I I I I 0.7 6.65 0.6 , 1 1 1 0.55 1 1 1 1 1 M 0.5 , 1 1 1 1 1 0.45 , _J _L 0 04 O. , i I I I ___ I____I ___I 0.3 1 1 I I I 1 1 025 I I I 1 0.2 1 1 1 1 ---r----r---r-------r---r _. 0.15 ------------- 0.1 1 1 1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" name 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 Printed 6/4/2020 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 Description 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph -------------------------- 0.75 1 ___!____i____!____! ___!____! a.n ds ___! ___!____! 0.7---;----'r----------------- ------;----rType 1 24,l,hr- yr- 0 65 ' . -_-_-_----------J--------L------J-------L'---Ralrfa_-F_-w_-I _-�_--84 _-" 055 --�ubffea4i7Grac 0.5 31rffVuI�-0.0$0}a__# 0" 0.4 th 4,23 --- - - ------------ _thin 600.3 ON- 0.25 0.2 .---- L0.15 0.1 10 11 12 13 Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 6L: POA 3 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 / ------------- 0 IrdIOW / / ana Pflma 0.75 071 �,_ tavk�l 4.170 0.7 ---- --- --- - - -'IJnf -Area-- -�c - I I I I I I 6.65 / -y __ -I I I I I I I I I I I I 6.6 I I I I I I I I I I I I I I I I I I I I I 0'55 I I I I I I I I I I 0.5 / I 0.45 , / / 0.4 / 3 / I I I I I I I I I I I I I LL 0.35 I I I I I I I I I I I I I 0.3 I I I I I I I I I I 0.25 I I I I I 0.2 / 0.15 I 0.05 0 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 HydroCAD09.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 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 - PERRY name PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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, m S Subcatchment 1S: DA-1 Hydrograph Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 2L: POA 1 PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Link 2L: POA 1 Hydrograph I I I I r---r___r----r___�____r---r---r---- r -- r---r---r------- FEIrlHow . Primary I I I I I sss C(S I I I I I I I LL3p ' _66oInflow: Ar_eJIIIIIIIIIIIIIIIIII a -_3IIIIIIIIIIIIIIIIIII .0_61IIIIIIIIIIIIIII 0 _aJIIIIIIIIIIIIII c ------------------ ------------ ------ s I a 32 1 Pre Dev - PERRY name PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Description 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph _J _L _ _1 _I _1 _I _J _L _ I---- I _I _1 _L 8 I zaa as I I I 7 ,I ,I r Type it �4--hr-1 *- I, I, I, I I I I Rainfall:5.20" 5 Runbff Area1=4.780 'ac ---- ---- JIRuhoff'Vo1`um'--0:503Laf 5 I ��noff-Runoff- pI I}y �— I /�I r____I____T____I____y_' s 4 Tc'=17L5 Min LL 3- P � I I I I I I I I I I I T-N-60 I I I I I I — I ---J----L---1---- 1---- 1----1----1---- L---- I----1---- I----1----L--- - - 2 I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 4L: POA 2 PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Link 4L: POA 2 Hydrograph y,a a43 Cs --- -- ■ Phrryimoxa ry 743 cs --- NlfW�47 �80 ac ] 6 I I I 5 J r I I I I I 3 4 0 / I LL I I I I I I I I I I I 3 I I I I I I I I I I I I I I I I I I I 2-. ' I I 1 I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY name PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Description 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph I I I I I I I I I I % I I 5,69 cis I I I I I I I Type II 24-hr 1 dyr- 6 Rainfall:4.20" - - - ]Run6ff Areal_4.170-'ae- 5 Runoff', Vol',um�=0:,439', of —7 —Y —I —Y 4 Runoff DepthA.2�6" I I I I I I I I I I ----.-T-C=1&6Inin- 3 ' CAN='160 I I I I I I I I I I I I I --- -------------------- -- 2 I I I I I � I I Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 6L: POA 3 PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Link 6L: POA 3 Hydrograph j_i _L _I _I -------------- Inflow I I I I I I I I I I � Q.QS C(S I I I I I I I � Prima ry Infh _DW Area-I4-.1?0_ac__ 6 I I I I I I I I I I I I I I 5 I I I I I I I I I I I I I I I I I I 4 I I I I I I I 0 I I I I I I I I I I I LL I I I I I I I I I I I 3 I I I I I I I I I I I 2 ' I I I I I I I I I I I I I 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 100yr Rainfall=8.56" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD09.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 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 1124-hr 100yr Rainfall=8.56- Prepared by {enter your company name here) Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 02011 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 1S: DA-1 Hydrograph -1 1---- 1---- L___1____L---- 1 ---- I----L---J____L--- i 18 ypel1124 h 14 � - -------- ----�talnfal 13 ---J----i----'----L----L---L-- -----L---L----L--- 12 _ _II- - --Runbff_AreA=3 -i -Y -r -7 r % 10 ___ _ __ fi 9 --- - ------II- ---- _Runo_-D� t -------------- 1I I I I I I I LL T ' s 5 II II II II II II II II ---i---- ■Runoff 1 Qdyx _ A nl�Sl _ 3C - at- 5___ tFf - 52 Time (hours) Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 Link 2L: POA 1 Hydrograph --- ----- -----------I--- ----r-------- --- --------I --- ---- --- I ■Inflow 17 /' 0Pnmary ___J___-L---1--- I----L---L 15.25 c1s �I1JLJ---- L___ 16 '/ 'll----III Inflow: Area _ 4GQ,ic- 15 ---;--------+--- ----5._25d= --- r 1 r_. ___r___r 14 / / I I I I I I I I I I I 13 / 12 / I a 'O ' / ____I____I ___ I I I I I ___ ____I____ ____I____I ____I____I I I I I I I I I I - I -I - I v 9 / / 11------------------ 0 8 1 1 1 1 7 / 6 / 5 1 1 I I I 1 1 1 I I I I 1 1 1 1 1 4 1 1 1 1 I I I 1 1 I I I 1 1 3 2 1 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 Description 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrogreph _{ _F _I _h _I _{ _f 23 ----i----T----i---i----i----1----i----1----T----i----i----i----1----i---_ 22 -J _1 J _1 _L___J 21.22 ch-I____1 _ L___J____L___J____1____ i 21 -Y -T -I -Y -r -T -I -Y 2 ell ftr ,Y/r I 19 ---J-_-_-_-1-_-_--I----L----L---L-- - 18 17 -1 -T -I -T - --- -- ----I---- T--- -I -T -T -- ------I- L----RunbfFkre.-fi80c- 7----� -:R4TtoffNojumg=-1-36Y�� 13 -------L--------{---- ---{- , Runoff D 1 tlrs3.2"- v 12 ----------------------------- ----------- -- -- --- o „ I I I I --- I I I I I I I LJ,-- �'.�-rrirrr- LL I _ I ___I I ,- T--- }- I I I r----I----1----11----L- _ _d-9 9 , TT % I -1 -T -I -T 1 -T -I -I -T -r -T -T T -T s i I I I I I I I I I I I 4 -1 -T i 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ RunoH Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 / --- i 1 i I i I 1_ I I i I i i I---- ■Inflow ____1____sizcs ■Prima ry23 22 r-21Mds --Jnf16 Arc_2, I , 19 ' ___J____1____1___I____ L---L------_I____L___�____ L___ a____ L___ ,/ ,6 / , -4 -I -+ -I -h - I -4 -I -+ -I -h -Y -F 17 / / 1 16 1 -- -I -4 -J -I -- -I 15 ---,----r--- r---- r---r----I---,----r- I I --r----r---r----i-- - -r - -_ 14 I _L _ i _L _J _L 13 12 / 1____L---1___I____L 1___J____L___J____L___ 10 _______--- _________________ - 9 , _J _I _L / /' 6 '/ I I I I I I I I I I I I 7 1 1 1 1 1 1 1 1 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 Description 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph ,9 '--- I----T----- I --T----r-- -Type 11 -24--hr-10 18 ---- I - - -- T - -- - -- T - - - --- - - - ---- -I-- T ,% I T I T RainialWB.5F - 15 " -----------------'----I---------- Ftundff-Ared--4,17V-aa- ,q I -------------------Ir----II-- 13 _IIRuoi`il�V�oMum�_1�1�O;af= ___--____T____� ___T____r____I__ 12 " ------T --------+----IT---------+-RunofDth3.3'�= „ ____L___J____1____I_____I__ __I____I_ _ 010 i --J----1----1----1----L---J---1----1---- LL " 3 --------------------------,----.----�- 4_N_16_o-_- " ___ ___ ___ _ -1 -T T -T -T -T I -T -� s ____I____I____I____I____I_____I__ 1____11L___J__ 2 " ___ ___ ____ T T 10 11 12 13 14 15 16 17 18 19 Time (hours) ■ RunoH Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 Link 6L: POA 3 Hydrograph --------------- ---- -------L---I ------------ ---- ---J ---- --- ---'----'----}----'--------------'--------}---------------I--- I I I I ■Inflow 21 ' I I . Primary ' -----------T--------r---r t5.00 cfs----------T--------r-------r--- 20 ' s� ,= 1918 ---J----�----L---L----L-- nflowTArea_4.17fiat- / ,' I 17 --- r---r---r----I----r---r---�----r---r----I----r---�----r- — 16 ' L___ J____ L___ 13 ' ' pj 12 ' I / ' I LL 9 / I 6 ' I 7 / ___J____I____1___L____L___J _I _1 _J _L _J _L 6 4 / I I 3 / ___J____I____1___J____L--- -__L--- J---- L___ 2 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE DEV Pre Dev - PERRY RESIDENCE Type 1124-hr lyr Rainfall=2.84" Prepared by {enter your company name here} Printed 6/4/2020 HydroCAD09.10 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=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 1124-hr 1 yr Rainfall=2.84" Prepared by {enter your company name here) Printed 6/4/2020 HvdroCAD® 9.10 s/n 07054 02011 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 II 24-hr 1yr 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 1S: DA-1 Hydrograph �I r--- 085 _--T----r---T----r___T----T--__�----T--------r----r---r--- 0 8 0.71 cfs 0.75 T-- e l 2A 0.7----'I li ---11- ---11-- r 11- - i �taifa41 0.65 --rl- r---, 1 ---Aunbfif-Ares=3 os -------- 0.55 11 - �1----'1r --- �1----1 - -- -JI p ---Ru Po F'iVlilpme=-O Runoff a 0.5 0.45 11 1 -I111-RIJh_O0-De pf e 0.4 --- -- --- ' 0.35 0.3 11 11 11 11 11 11 11 11 11 0.25 -T __ -T 02 _y _r _r 0.15 0.1 0.05 Time (hours) it #yr= 9 92111- ■ RunoH Pre Dev - PERRY name Summary for Link 2L: POA 1 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 ' ------ -r---I - -- 1--------I--------r---i I I - ---� --- ------------T -- - I I 1 ■ Inflow r____I____r___�____I____r___________r___r____I____r___1____r___ ■Primary 0.85 1 1 o.iacis 1 1 1 0.6 ---7----1----r-------;--- o. a [ow Aire=i3.0� // -----------~---J----1----ti -I-lnf --- - 0.75 1 1 1 1 1 07 _L _J _I _L _I _L _J _I _1 _J _L 065 I____I I____I I____I 0'6 ' , ________ ___ ___I I I I I I I ___I ___I ___ ___I ___ ___ I I I I I I I 0.55 -I -I -I -I -I -I -I -I -I -I pj 0.5 " 0.45 1 1 1 1 0 0.4 1 1 1 1 , I _I _1 _J _L Oar 1 1 0.3 1 1 I I I 1 1 0.25 I I I 1 1 I 1 1 0.2 0.15 / 1 1 0.1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" name 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 II 24-hr 1yr Rainfall=2.84" Area (ac) CN Description Printed 6/4/2020 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 Description 17.5 Direct Entry, Subcatchment 3S: DA-2 Hydrograph 0.85 0-8 ors ais 0J5 Type 1(24-,hrJyr ---,----r---,----r---,-- --r r r r--- -r -T IRa nfall_ -84"- 0.65 0.5 -tau rrbff-ATect:A-7ftU'ac- --- L-------�--- ------ --L-- 1----L---1----L----I----L--- 0.5s Aunoff ValpmW-0.09I of 1 0.5 --- tunoffDe th>07.23" 30.45 ---T----T---T----T---T------------T----�------------T--- 0.4 ------ Tc=i7.5-Min- 0.35 0.3 YN=NV --------- -------- --- 0.25 0.2--------------------------t-- --- "----- "----f--------f--- 0.15 0.1 n ns - 10 11 12 13 Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 4L: POA 2 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 ■ Mim 685 1 0MCis ___----L-------L---J----L--_ I I I I I ■ Pfimary --'--- o.�e �i� -' 1nf�owll Aroa=4:7 Q 41c - 08 0.75 I I I I I I I I I I 0.7 6.65 0.6 , 1 1 1 0.55 1 1 1 1 1 M 0.5 , 1 1 1 1 1 0.45 , _J _L 0 04 O. , i I I I ___ I____I ___I 0.3 1 1 I I I 1 1 025 I I I 1 0.2 1 1 1 1 ---r----r---r-------r---r _. 0.15 ------------- 0.1 1 1 1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre Dev - PERRY PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" name 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 Printed 6/4/2020 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 Description 16.6 Direct Entry, Subcatchment 5S: DA-3 Hydrograph -------------------------- 0.75 1 ___!____i____!____! ___!____! a.n ds ___! ___!____! 0.7---;----'r----------------- ------;----rType 1 24,l,hr- yr- 0 65 ' . -_-_-_----------J--------L------J-------L'---Ralrfa_-F_-w_-I _-�_--84 _-" 055 --�ubffea4i7Grac 0.5 31rffVuI�-0.0$0}a__# 0" 0.4 th 4,23 --- - - ------------ _thin 600.3 ON- 0.25 0.2 .---- L0.15 0.1 10 11 12 13 Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 6L: POA 3 PRE DEV Type 11 24-hr 1 yr Rainfall=2.84" Printed 6/4/2020 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 / ------------- 0 IrdIOW / / ana Pflma 0.75 071 �,_ tavk�l 4.170 0.7 ---- --- --- - - -'IJnf -Area-- -�c - I I I I I I 6.65 / -y __ -I I I I I I I I I I I I 6.6 I I I I I I I I I I I I I I I I I I I I I 0'55 I I I I I I I I I I 0.5 / I 0.45 , / / 0.4 / 3 / I I I I I I I I I I I I I LL 0.35 I I I I I I I I I I I I I 0.3 I I I I I I I I I I 0.25 I I I I I 0.2 / 0.15 I 0.05 0 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 HydroCAD09.10 s/n 07054 ©2011 HydroCAD Software Solutions LLC Page 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 - PERRY name PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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, m S Subcatchment 1S: DA-1 Hydrograph Time (hours) ■ RunoH Pre Dev - PERRY name Summary for Link 2L: POA 1 PRE DEV Type 11 24-hr 10yr Rainfall=5.20" Printed 6/4/2020 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 Link 2L: POA 1 Hydrograph I I I I r---r___r----r___�____r---r---r---- r -- r---r---r------- FEIrlHow . Primary I I I I I sss C(S I I I I I I I LL3p ' _66oInflow: Ar_eJIIIIIIIIIIIIIIIIII a -_3IIIIIIIIIIIIIIIIIII .0_61IIIIIIIIIIIIIII 0 _aJIIIIIIIIIIIIII c ------------------ ------------ ------ s I a 32 1 Pre Dev - PERRY name PRE DEV Type 1124-hr 100yr Rainfall=8.56- Printed 6/4/2020 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 Link 6L: POA 3 Hydrograph --------------- ---- -------L---I ------------ ---- ---J ---- --- ---'----'----}----'--------------'--------}---------------I--- I I I I ■Inflow 21 ' I I . Primary ' -----------T--------r---r t5.00 cfs----------T--------r-------r--- 20 ' s� ,= 1918 ---J----�----L---L----L-- nflowTArea_4.17fiat- / ,' I 17 --- r---r---r----I----r---r---�----r---r----I----r---�----r- — 16 ' L___ J____ L___ 13 ' ' pj 12 ' I / ' I LL 9 / I 6 ' I 7 / ___J____I____1___L____L___J _I _1 _J _L _J _L 6 4 / I I 3 / ___J____I____1___J____L--- -__L--- J---- L___ 2 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PERRY RESIDENCE Time of Concentration Calculations EDEV 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.Ofps 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. EDEV TOC DA-2 100 ft Overland Flow 3.03% slope 0.35 C-value 11.3 min Seelye Chart 598.4ft 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. EDEV 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 "=1 REVISED: 4-20-2020 DA-3 3.45 cc Imp=0.06 cc Turf=2.69 cc Woods=0.70 cc l::{TOC=17.9 min \ 100' STREAM BUFFER 100' STREAM BUFFER \ISTING STREAM" (0,, 0 PERRY, RI � D.B. 50E 52.92 RNANNAI USE VACANT RE I I u'i IIII POA... , \�TOC=18.1 min WA TOC=1 Perry Residence Post -Development SWM DAL Map P6stlN DmInaos Arms ImpsMous Woods Manaped TUFF DA SF AC SF AC SF AC SF AC 1 122763.6 2.82 Mal cl19 963352 221 18334.2 0.42 2A 203047.8 4.66 40841 clog 5275cl0 1.21 146213.8 3.36 2B 35380.0 0.84 12475,3 0.29 0.0 000 239D.7 0.55 3 150072.3 3A5 254&6 006 30471.4 0.70 117054.4 2.09 TOTAL 512263.7 1 11.70 27201.0 &62 179556,8 412 305505.1 7.01 F row ROWS lGfV 1yr 10-yr I Wow 0.35 4.05 11.95 0.82 7.70 21.85 0.79 2.65 567 0.56 5,25 15.04 2.52 19.65 5A51 i DA-2B 0.84 cc Imp=0.29 cc Turf=0.55 cc Woods=0.0 cc =15.8 min OA 2 , io EX DIRT DRIVEWAY ELEV: 486.88 DA-2A & DA-2B POA-2 5.5 ac Imp=0.38 cc Turf=3.91 ac Woods=1.21 cc MIOI dl POA CMTRIAUTING DRAINAGE AREA Flow Rafts (d8) IF OA i.yr 10-yr 100-yr 1 DA-1 036 4.05 11.95 2 DA-2A a DA38 1.59 10.33 27.51 3 DA-3 0.55 525 1504 TOTAL 2.50 19.63 5450 SHIMPENGINEERING, PC ENGINEERING-L4ADPLANNING -PROWT MANAGEMEAT 912 E HIGH ST PHONE. (434) 227-5140 CHARLOTTESMI-IE. VA 22002 JUSTNdSHIMP—ENOINEERINO.COM REVISED: 08-06-2020 Perry Residence Ditch Drainage Map Ditch Analysis: PERRY RESIDENCE Modified LD-268 Roadside and Medan Ddch Des Farm s:m sme Mn My .ao6 ditch C A U Tc -in 0 IW O -tln O3 QM _:1 L 1 a ''� 51� AIW�e Very 19yr Ystiry 1 Type FM G Oa-acl SF AC INCR ACC F4F4 FLF( Vdmry1n 1 Q32 618900 214 INK I 1M am m 40 362 094 K-2 IYPEl Q56 150 2 1131 1 ID 63.0) t66 146 1 146 5.0 LO S.D IM LE 79 1 992 1 3 3 1 Q@ 002 7.0 lPl M K-3 WE1 &119 150 3 am 93734.00 215 065 065 5.0 LO S.D 681 0.0 3.34 4b 1 3 3 1 009 O.® 40 392 M K-2 WEI MU 100 4U Q34 =63.13) 282 Q93 093 I5b LO 338 4W 093 3.15 436 2 2 1 1102 00 40 332 Q96 K-2 1 1 LO6 200 2-yr V.Mo m"bom pefomal. aleMmts fl2yrror —10-,Q cgcWgun pel is YO sMXaxots Ype6 lo".. Culvert Analysis: CWyee9M.ysis C elwrt Oie On) Ole(t) OP(ec)_ InletEbv OutletElev LeIgM Slope IDylow(yA) OEPFX (q AV6 A £ VFLWfvlyps) 1 15 125 212 474 470 5225 0.077 9.92 0.89 1Q88 2 15 1.25 466 480 476 5988 0.067 4.36 0.55 837 150 300 450 8 100, EXISTING \I t _ 1 51-24C PERRY, ROBE II D.B. 5084/ 52.92 A( RIVANNA OSI ;USE: VACANT,RESIDI I i I I I / (/// 1 / I I 1/ DITCH - 3 I f i 2.15 AC I I L I CULVERT #2 DITCH - 2 4.66 AC DITCH - 4EX 2.82 AC CULVERT #I 714.J5, 231 LAND DITCH - 1 -- 0.14 AC 1 7F f G XISTING STREAM { DIRT DRIVEWAY Post -Development HydroCAD Report Perry Residence 1S 3S 4S 6S D -1 DA-2 A-213 D -3 2L 5L 7L a POA 1 POA 2 POA 3 Subcat Reach On Link Drainage Diagram for Post Dev - PERRY RESIDENCE Prepared by {enter your company name here}, Printed 6/4/2020 HydroCAD® 9.10 stn 07054 0 2011 HydroCAD Software Solutions LLC Post-Dev Post Dev • PERRY RESIDENCE Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 4.120 55 Woods, Good, HSG B (1S, 3S, 6S) 7.020 61 >75%Grass cover, Good, HSG B (1S, 3S, 4S, 6S) 0.630 98 Paved parking, HSG B (1S, 3S, 4S, 6S) 11.770 TOTAL AREA Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 3 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 SubcatchmentlS:DA-1 Runoff Area=2.820ac 6.74%Impervious Runoff Depth>0.21" Tc=17.9 min CN=59 Runoff=0.36 cfs 0.048 of Subcatchment3S:DA-2A Runoff Area=4.660ac 1.93%Impervious Runoff Depth>0.23" Tc=15.7 min CN=60 Runoff=0.82 cfs 0.090 of Subcatchment4S: DA-2B Runoff Area=0.840ac 34.52%Impervious RunoffDepth>0.72" Tc=15.8 min CN=74 Runoff=0.79 cfs 0.050 of Subcatchment6S:DA-3 Runoff Area=3.450ac 1.74%Impervious Runoff Depth>0.23" Tc=18.1 min CN=60 Runoff=0.55 cfs 0.066 of Link 2L: POA 1 Inflow=0.36 cfs 0.048 of Primary=0.36 cfs 0.048 of Link 5L: POA 2 Inflow=1.59 cfs 0.140 of Primary=1.59 cfs 0.140 of Link 7L: POA 3 Inflow=0.55 cfs 0.066 of Primary=0.55 cfs 0.066 of Total Runoff Area=11.770 ac Runoff Volume = 0.255 of Average Runoff Depth = 0.26" 94.65% Pervious=11.140 ac 5.35% Impervious = 0.630 ac Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 1S: DA-1 Runoff = 0.36 cfs @ 12.18 hrs, Volume= 0.048 at Depth> 0.21" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr lyr Rainfall=2.84" 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 1S: DA-1 Hydrograph — RunoH Time (hours) Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 3S: DA-2A Runoff = 0.82 cfs @ 12.14 hrs, Volume= 0.090 at Depth> 0.23" Runoff by SCS TR-20 method, 11H=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr lyr Rainfall=2.84" 0.090 98 Paved parking, HSG B 3.360 61 >75%Grass cover, Good, HSG B 1.210 55 Woods, Good, HSG B 4.660 60 Weighted Average 4.570 98.07% Pervious Area 0.090 1.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (CIS) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph — RunoH Time (hours) Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 4S: DA-2B Runoff = 0.79 cfs @ 12.10 hrs, Volume= 0.050 at Depth> 0.72" Runoff by SCS TR-20 method, 11H=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr lyr Rainfall=2.84" 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 o.w T----T--------- __ C 0.8 T r ;-- -- r - - - -I 0.7 -------'}----'�I----'�I----}----'�I---- oss - -- T 0.6 --------------------t----i---- 0.55 ---1----1----L---J----L----I---- 0.5 -------+----'i-------}----'i --- `.0.5 - -- ----T----'r---7----r-------- oa - LL 0.35 - -- III----1----L---J----L----'---_ 0.3 0.25 r---r----r---r- - -- r-- - -r--_ 0.15 0.1 ___ �r---r----'r-------r----'r-- 0.05 - -- li--------_ �r--- TgpI liyr r ;---Rain',fall4.$;4"_ -- --Runoff Area".0840-ac ---L---1----1----L---1----1----i---- ---Runoff Vo[ rne=0-W:af-- ------- 'Ifluno## Depth>D72"_ r--L--- �li----L----L ■ V.P:l5 Y----r---r----r----I------------- ___ - T--- T--- -I---- T-------- I I I I Time (hours) Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 6S: DA-3 Runoff = 0.55 cfs @ 12.18 hrs, Volume= 0.066 at Depth> 0.23" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr lyr Rainfall=2.84" 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, m 3 s w Subcatchment 6S: DA-3 Hydrograph Time (hours) — RunoH Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 8 Summary for Link 2L: POA 1 Inflow Area = 2.820 al; 6.74%Impervious Inflow Depth > 0.21" for lyr event Inflow = 0.36 cfs @ 12.18 hm Volume= 0.048 of Primary = 0.36 cfs @ 12.18 hm Volume= 0.048 af, Men= 0% Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: POA 1 Hydrograph 0.38 - -- --- -- - -'I- ------ 'r --- --C 0.36 ___ ---- ----'---- ----'r------ -- 0.34 ___Ji____ li---- 'i ___17____'i ___Ji____ 0.32 -----------'r___----'r___---- 0.3 -----------'i___---- 0.28li ---- �i ___17____�i ___Ji____ 0.26 ___ 0.24 ___J____!____I____!____I____ .. 0.22 li---- i____-ii____L___J____ 0.2 ___ LL 0.18}------------'---- 0.16 - -- 0.14 ---L----L--------L---- IL 0.12 -L 0.1 _L 0.08 _L 0.06 _L 0.04 _L 0.02 -L _L _ _' _L -L _I —Pnmary I��j 11r� I /� Irk eI� I - ---� 1VwFArOa--iL�2O-SC'-_ I I I I I____I____I____ __J____1____I____ J____ L___ J____1____ I I I I I I I __J____ 1____L___J____L___J____1____ I I I I I I I I I I I I I I I - I I I I I I I �____�____I____ �____�___ L____L____ I - I I I I I I I I I I I I I I I I ___ I___ 1____L___J____L___I____1____ I I I I I I I ___ I____I _L___J____ ___ 1____ ___J _1 _L _J _L___I____1____ I I I I I I I 12 13 14 15 16 Time (hours) Post-Dev Post Dev • PERRY RESIDENCE Type/1 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 9 Summary for Link 5L: POA 2 Inflow Area = 5.500 ac 6.91%Impervious, Inflow Depth > 0.31" for lyr event Inflow = 1.59 cfs @ 12.12 hm Volume= 0.140 of Primary = 1.59 cfs @ 12.12 hm Volume= 0.140 af, Men= 0% Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 5L: POA 2 Hydrograph I I I I I 7 i I I I I I I I I I I I I I I I I I Inflow Aroa-5.590 ;ic I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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 Tim (hours) — Inflow Primary Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 1 yr Rainfall=2.84" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 10 Summary for Link 7L: POA 3 Inflow Area = 3.450 al; 1.74%Impervious Inflow Depth > 0.23" for lyr event Inflow = 0.55 cfs @ 12.18 hm Volume= 0.066 of Primary = 0.55 cfs @ 12.18 hm Volume= 0.066 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 0.6 ___y____t____I ---- T____I ----- I ---- T---- I---- T____ I 0.55 (:r$ Irk°W �Pmldry 9.55 _J _1 _I _1 _L _I _1 _I�,,�j_1 _L/� _J _L _1 0.5 --- �''I----+----'�� A_I --- ll-lJjb-LlrOa=.YQ-- I I I I I I I I I I I I I 0.45 ___r____r____r___r____r____I____ I I I I I __ I____7____r___i____r____I____r____ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 3 0.3 ___J----li--------1i--------�____ _- - I I I I I I I LL 0.25 -T I -T -I I I -T I -r I -I -I I I I I I I I I 0.2- I I I I I -I I I I I I I I I 9.15 I I ________ I I I II________ I I I I____ ____ ___ I I I I I I I I I I I I I I I I 0.1 I -I I I -I I I - - - - I I I I I I I 0051 y I -t -I I I -4 I -F I -I I -t -F -y -t I I I I I I I I 0 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) Post-Dev Post Dev • PERRY RESIDENCE Type ll 24-hr 1Oyr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 11 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 SubcatchmentlS:DA-1 Runoff Area=2.820ac 6.74%Impervious Runoff Depth>1.20" Tc=17.9 min CN=59 Runoff=4.05 cfs 0.281 of Subcatchment3S:DA-2A Runoff Area=4.660ac 1.93%Impervious Runoff Depth>1.26" Tc=15.7 min CN=60 Runoff=7.70 cfs 0.491 of Subcatchment4S: DA-2B Runoff Area=0.840ac 34.52%Impervious RunoffDepth>2.31" Tc=15.8 min CN=74 Runoff=2.65 cfs 0.162 of Subcatchment6S:DA-3 Runoff Area=3.450ac 1.74%Impervious Runoff Depth>1.26" Tc=18.1 min CN=60 Runoff=5.25 cfs 0.363 of Link2L: POA 1 Inflow=4.05cfs 0.281 of Primary-4.05 cfs 0.281 of Link 5L: POA 2 Inflow=10.33 cfs 0.653 of Primary=10.33 cfs 0.653 of Link 7L: POA 3 Inflow=5.25 cfs 0.363 of Primary=5.25 cfs 0.363 of Total Runoff Area=11.770 ac Runoff Volume =1.297 of Average Runoff Depth =1.32" 94.65% Pervious=11.140 ac 5.35% Impervious = 0.630 ac Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 1S: DA-1 Runoff = 4.05 cfs @ 12.12 hrs, Volume= 0.281 at Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr 10yr Rainfall=5.20" 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, 1 0 LL Subcatchment 1S: DA-1 Hydrograph Type II 24-h'r 10yr Rainfall-4.x0" ---Runoff A1rea,2.820ac Ru6off;Volj mO_0.281;af Ru noff Depth>120" -'-l-,M1-l-- Tc-17;9 njin CN=59 Time (hours) — RunoH Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment 3S: DA-2A Runoff = 7.70 cfs @ 12.10 hrs, Volume= 0.491 at Depth> 1.26" Runoff by SCS TR-20 method, 11H=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfa11=5.20" 0.090 98 Paved parking, HSG B 3.360 61 >75%Grass cover, Good, HSG B 1.210 55 Woods, Good, HSG B 4.660 60 Weighted Average 4.570 98.07% Pervious Area 0.090 1.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (CIS) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph TypQ II 24 Ftir 1 Qyr a - -- ---- -- Rainfall=5.ZO" Runoff Area�4.660 ac --------------------i-f--,Ruraoff;Volumr =0.491 af- i Time (hours) Tc-.15:7 min — RunoH Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 4S: DA-2B Runoff = 2.65 cfs @ 12.08 him Volume= 0.162 at Depth> 2.31" Runoff by SCS TR-20 method, 11H=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10yr Rainfa11=5.20" 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, 0 LL Subcatchment 4S: DA-2B Hydrograph Type 1124-h,r 1 dyr Rainfall=5.x0" ;Runoff;Vol u me-0.162; of Runoff Depth>2.31" Time (hours) Tc-15:8 main — RunoH Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 6S: DA-3 Runoff = 5.25 cfs @ 12.12 hrs, Volume= 0.363 at Depth> 1.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr 10yr Rainfall=5.20" 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 5.25 cfs 11�5 airrRfa _ . 0" Runoff Aj : : : I rea�3. I I ;Runoff ;VoWm6=0.363; of c718:1 rriin -- - -- --- - -;- ----- -- - - -- - - -- CN=60 Time (hours) — RunoH Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 16 Summary for Link 2L: POA 1 Inflow Area = 2.820 ar, 6.74%Impervious Inflow Depth > 1.20" for 10yr event Inflow = 4.05 cfs @ 12.12 hm Volume= 0.281 of Primary = 4.05 cfs @ 12.12 hm Volume= 0.281 af, Atten= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: POA 1 Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Inflow Aroa 2.820 �c I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) Inflow Primary Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 17 Summary for Link 5L: POA 2 Inflow Area = 5.500 ar, 6.91%Impervious, Inflow Depth > 1.42" for 10yr event Inflow = 10.33 cfs@ 12.09 hm Volume= 0.653 of Primary = 10.33 cfs @ 12.09 hm Volume= 0.653 af, Atten= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 5L: POA 2 Hydrograph cfs T---- r----r --- T----r - ---r---T---- ---1----L---- Inflpw ---- 1----'L---- --- 'ArOa-5.5Q0 -1---- ;ic ---1----L---- 1----1----L----1---- ---- _1 _L _L _I _1 _1 _L I I _I _L _L _- I I I I _1 I -T r 1 -1 r -T Time (hours) Inflow Primary Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 10yr Rainfall=5.20" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 18 Summary for Link 7L: POA 3 Inflow Area = 3.450 ar, 1.74%Impervious Inflow Depth > 1.26" for 10yr event Inflow = 5.25 cfs @ 12.12 hm Volume= 0.363 of Primary = 5.25 cfs @ 12.12 hm Volume= 0.363 af, Atten= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 7L: POA 3 Hydrograph I I I I I I I I I I I I I I I I I I 5 r ---- ---finf O1W,Alr -3.-4 Q- c-- I I I �a -I I I I I I I I I I I I I I I I I I I I I I 4 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 3 ___ ----- �---- ------------------------------- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 2____ ---- I_--- _I____I____I____ _ __I____I____I____I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 _ I _ I _I _ I _ I _I _ I _ I _I _ I _ _ _ I _ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0 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 10Oyr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 19 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 SubcatchmentlS:DA-1 Runoff Area=2.820ac 6.74%Impervious Runoff Depth>3.31" Tc=17.9 min CN=59 Runoff=11.95 cfs 0.778 of Subcatchment3S:DA-2A Runoff Area=4.660ac 1.93%Impervious Runoff Depth>3.43" Tc=15.7 min CN=60 Runoff=21.85 cfs 1.331 of Subcatchment4S: DA-2B Runoff Area=0.840ac 34.52%Impervious RunoffDepth>5.04" Tc=15.8 min CN=74 Runoff=5.67 cfs 0.353 of Subcatchment6S:DA-3 Runoff Area=3.450ac 1.74%Impervious Runoff Depth>3.42" Tc=18.1 min CN=60 Runoff=15.04 cfs 0.984 of Link 2L: POA 1 Inflow=11.95 cfs 0.778 of Primary=11.95 cfs 0.778 of Link 5L: POA 2 Inflow=27.51 cfs 1.683 of Primary=27.51 cfs 1.683 of Link 7L: POA 3 Inflow=15.04 cfs 0.984 of Primary=15.04 cfs 0.984 of Total Runoff Area=11.770 ac Runoff Volume = 3.446 of Average Runoff Depth = 3.51" 94.65% Pervious=11.140 ac 5.35% Impervious = 0.630 ac Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 1S: DA-1 Runoff = 11.95 cfs@ 12.11 hrs, Volume= 0.778 at Depth> 3.31" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr 100yr Rainfall=8.56" 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) (fUsec) (cfs) 17.9 Direct Entry, 1 s LL Subcatchment 1S: DA-1 Hydrograph -----------------------------------------------------------*-- r--- 11.95 cis Typell 24fir; aDdyr ---- ---- ---- --- ---- ---- -- ---Rainfall;-8.5,6 --------- --- ---- ---- -- ---Runoff-Area=2.820-ac- Ruff;Voljume-8.77& of _Runoff Denth>3.31"_ _ T6:17;9 Min- 1 5, -----------i--------�--- -- Time (hours) — RunoH Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.5i Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 3S: DA-2A Runoff = 21.85 cfs@ 12.08 hrs, Volume= 1.331 at 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" 0.090 98 Paved parking, HSG B 3.360 61 >75%Grass cover, Good, HSG B 1.210 55 Woods, Good, HSG B 4.660 60 Weighted Average 4.570 98.07% Pervious Area 0.090 1.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (CIS) 15.7 Direct Entry, Subcatchment 3S: DA-2A Hydrograph 24 ----I---------r----i----I----------- ----------------------------------- 23 -___ 21.85 cis -___-J--__,____I---_J____,____�____ —Runoff 21 --_J____1____L____I____J_________ ___!_ -■/�� --Ty{�e;ll34:ir,1DQyC20 _I _J _1 _L _J _1 _J T P 19 3 ____i___-r=11aJ�fa1118 _J____1____1____r___J____I--- 'F7 CN16 -I -T -T -r -1 -t Runoff Ar-eiQ��-WVV acI I II I14--------;------------ ---- ----RuOoff;Vt�ljtxn �:13 ____I____7____r____r___-____r_______�____r____r ___�____12 ____I____1____ L____I____ �____I---_ 11 ____I______________�___y____+________�____�____�____Runoff ___10 L LL __I____1____ 1____ L___ J____ ____J____L___J-I��9r_7 III 7----r----r �----- ---�----r----r I s ____I____1____1____ L___ J____ L___ L____J____ I L____I____ J____I -___I____,____+____r___y____+___ r____y____+____,____y----,-__-r4 --------7----r----r---�----r-----------r-------- I I 3 ____I____J____L____L___J____1___ L____J____L____I____J____1____L2 ____,_____ ______________,____y____,____r____ I Time (hours) Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.5i Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 4S: DA-2B Runoff = 5.67 cfs @ 12.08 him Volume= 0.353 at 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" 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 1 5.67 cfs l i____r___ 3 LL Type) 24-hrL100yr Rainfall=8.5,6" Runoff AreaL0.840 oc ;Runoff ;Volume=0.353; of Time (hours) -Depth:6&W' - Tc�15:8 min --------CN_74- — RunoH Post-Dev Post Dev - PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 6S: DA-3 Runoff = 15.04 cfs@ 12.11 hrs, Volume= 0.984 at Depth> 3.42" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 his, dt= 0.05 his Type II 24-hr 100yr Rainfall=8.56" 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) (fUsec) (cfs) 18.1 Direct Entry, 1 s U. Subcatchment 6S: DA-3 Hydrograph ---------- Typell 24-hr� 1-OQyr- ------- ----; ---Rafinda114.56"- -------------------------------- --- --- ]Runoff-Area=3c- ---;Rur�ofif;Voljum�-i�.1�S4; -------,-lunofif Depth>3A2"- -------=---- __T_�_ #_Y__81-mm- i i T---V-1--i-__i - - --r i - - --i i Time (hours) — RunoH Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 24 Summary for Link 2L: POA 1 Inflow Area = 2.820ar, 6.74%Impervious, Inflow Depth > 3.31" for 100yr event Inflow = 11.95 cfs@ 12.11 hm Volume= 0.778 of Primary = 11.95 cfs @ 12.11 hm Volume= 0.778 af, Men= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 2L: POA 1 Hydrograph I I I I I I I I I I I I I I I I I I I 11.95 cis I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I _ I I I I I I I I _1 _L I I I I I I I - I I I I I I I I -{---- L -I -J I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Time (hours) Inflow Primary Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD® 9.10 s/n 07054 © 2010 HydroCAD Software Solutions LLC Page 25 Summary for Link 5L: POA 2 Inflow Area = 5.500 ac 6.91 %Impervious, Inflow Depth > 3.67" for 100yr event Inflow = 27.51 cfs@ 12.08 hm Volume= 1.683 of Primary = 27.51 cfs @ 12.08 hm Volume= 1.683 af, Men= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 5L: POA 2 Hydrograph 7____r____I____7____r____I____7____ r____ I____ 7____r____ 1____ 7____ I ___J____l____L___J____1____L_ 27.51 CIS-____I____-I____!____I____!-------- _ I I I I I I I I I I I I I I I I I I I I I I I I I I I I inflow-Arga;4.5Wo Oc-- r____1____ 7____ r____ ___7____7 1 7____r 1 7____ I I _J _l _L _J _1 _L _1 _L _L _J _1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 _L____I____L I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I -r -T -T - I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Time (hours) Prima Primary Post-Dev Post Dev • PERRY RESIDENCE Type // 24-hr 100yr Rainfa11=8.56" Prepared by Shimp Engineering Printed 8/6/2020 HydroCAD@ 9.10 s/n 07054 @ 2010 HydroCAD Software Solutions LLC Page 26 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 hm Volume= 0.984 of Primary = 15.04 cfs @ 12.11 hm Volume= 0.984 af, Atten= 01/4 Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 7L: POA 3 Hydrograph Primary Time (hours) PERRY RESIDENCE Modified LD-268 Roadside and Median Ditch Desi n Form Side Slope Min. Max n=0.05 Ditch C A CA To I-tin 12 110 0-1in 02 010 :1L y R Slope Slope Allowable Velocity 2-yr 10-yr Matting Type Freeboam Channel OePrn 5F AC INCR ACC FVFt FVFt Nelocily "Depth 1 0.32 6189.00 0.14 0.04 1.50 5.0 1.0 5.1] 6.81 1.50 ].]6 10.22 3 3 0.05 0.05 4.0 3.62 0.94 EC-2 TYPE 1 0.56 1.50 2 0.31 203163.00 4.66 IA6 1A6 5.0 1.0 5.17 6.81 1.46 253 1 9.92 1 3 1 3 0.02 0.07 7.0 4.07 1.01 ECA TYPE 1 0.49 1.50 3 0.30 93734.00 2.35 0.65 0.65 5.0 1.0 5.17 6.81 0.65 3.34 4.40 3 3 0.03 0.09 4.0 3.92 0.89 EC-2 TYPE 1 0.11 1.00 4EX 0.33 122763.00 2.82 0.93 0.93 35.8 1.0 3.38 4.67 0.93 3.15 4.36 2 2 0.02 0.06 4.0 3.32 0.96 EC-2 TYPE 1.04 2.00 R-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 OSTDEV TOC TO DET. DA-1 100 ft Overland Flow 3.92% slope 0.35 C-value 11.1 min Seelye Chart 152.88ft S.C. Flow 8.25% slope 2.Ofps 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. STDEV 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. STDEV 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. STDEV 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 Soil 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 M'72'N n t. 8 3 6WN Custom Soil Resource Report 3 Soil Map N M � � 743'W 7I OD 7422DD 742300 7424pD 74 742MO 742700 742i1p 742 7E M100 74320 74M 3 3 e Map SeL: 1:6,550'rf pdnbad m A lands pe(11"x 8.5')ste � N ME�s 0 W iW ZOD WO � 00 A 6 Map pi*ct n: Web Maomr Com c rdna�: WGSB4 Edge UTM Zone 17N W(SB4 9 M°]'2 N a 6WN 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, Description of Catoctin descriptions, and transects of the mapunit. 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) 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 Very low to high (0.00 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 transacts 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 iNhr) 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 it. 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 IVA 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 similarsoils: 85 percent Estimates are based on observations, Description of Dyke descriptions, and transects of the mapunit. 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) 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 Moderately high to it Custom Soil Resource Report 51C—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, Description of Bugley descriptions, and transects of the mapunit. Setting Landform: I nterfluves Landform position (two-dimensional): Backslope Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from 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 lucas and similar soils: 80 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transacts 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 Kf' 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 62B—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, Description of Buffstat descriptions, and transacts of the mapunit. Setting Landform: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from 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: Interfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Nose slope Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from greenstone Typical profile A - 0 to 4 inches: clay Bt - 4 to 48 inches: clay C - 48 to 79 inches: silty clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches 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 PA 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: Interfluves 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 transacts of the mapunit. Description of Meadowville, Occasionally Flooded Setting Landform: Drainageways Landform position (two-dimensional): Footslope Landform position (three-dimensional): Head slope Down -slope shape: Concave Across -slope shape: Convex Parent material: Colluvium derived from igneous rock Typical profile A - 0 to 18 inches: silt loam Bt - 18 to 53 inches: silty clay loam 2C - 53 to 79 inches: gravelly clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches 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 2/72020 Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Gordonsville, Virginia, USA*r.,,,,, Latitude: 38.1185°, Longitude:-78.2308° If Elevation: 492.93 ft** gIt a 3 "source: ESRI Maps j "" source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T. Parcybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps &aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)+ Average recurrence interval (years) Duration + z s +o zs soI +oo zoo soo +000 5a11in (0.3117-0.389) (03 778-0.462) (0.443-0.541) (0: 960 611) (0.559-0 686) (0.605-0. 6) (0.648-0.803) (0.686-0 856) (0: 32-0.925) (0.768 0 980) F-01 +o-min (0.5 0.621) (0.605-0..739) (0.709-0867) (0.796-0977) (0. 900-1.09) (0.964-11.19) (1.03-127) (1.09-21436) (1: 6-3136) (1.21-�54) -701 +s-rrrinF-O (0.632-0776) 7 60 (00.96) (0. 999310) (1.011224) (113-21.39) (1.22-3L50) (1.30L61) (1.37-11..71) (1.-6t84) 6 (1.5215 94) 30-rrrin (0.677-1-1.06) (1.06128) (1.2 A756) (1.6--6179) (1.67 2?05) (1.84-227) (1.9-2.47) (2.14 2z67) (2.32 2693) (2. 6--3.14) IF 1-81 IF 4.14 60-min (1.08--21.33) (1.32-�61) (1.63 2.00) (1.90 2.33) (2. 3-273) (2. 9---3.07) (2763.9) (3.0 �74) (3. 3420) 1 (3. 9-4.58) 2-hr (1.28-1.61) (1.56195) (1.93-2.43) (2.272686) (2. 93A1) (3.0�87) (33 94.34) (3. 54383) (4. 3---5.52) (a. 366.11) 5.39 3-hr (1.38---1.78) (1.67 2915) (2.08 2669) (2.44 3816) (2. 9 376) (3.27-4.8) (36 54.79) (4.045235) (a.56.11) (a. 9-66..76) 6-hr (1.73 225) (2.07 2671) (2. 6 3336) (3.02 3.96) (3. 0 4576) (4. 075.44) (4.616.17) (5.14 6995) (5.87 8606) (6. 9 9103) 12-hr (2. 5�80) (269-3.6) (3.21 4518) (3.79 4395) (a. 8 6600) (5.256.94) (59 67..95) 1 (6. 1 9A5) 1 (7.77- 0.7) 1 (8. 1012.2) 24-hr (2. 5520) (3.09-3.87) (3.944995) (4.655084) (5. 87018) (6.55-8.30) (7.48-9.55) (8. 9--810.9) (9.95- 3.0) (112314.7) 2-day (3.02-334.72) (3.664.50) (4.643.72) (5.44671) (6. 98514) p.52--9..35) (8.53-0.7) (9.60-12.1) (11.1214.2) (12.3- 6.0 6.IF 3-dey (3. 3-3593) (3.914076) (4.96 8604) (5.814209) (7. 3 8161) (8. 3 9789) (9.10-121.3) (102-12.8) (11.8-15.0) (1315 6.8) 4-day (3.43 4615) (4165.01) (5.27 6a37) (6. 88.47) 1 (7A8 9607) 1 (8.54- 0.4) 1 (9.67--111.9) 1 (10.9-13.5) 1 (12.6- 5.8) 1 (13.9-17.7) 7-day (4. 04779) (4.815576) (6. 0---7719) (6.98837) (8. 6--1.1) (9.6-11.5) (10.7- 3.0) (119-14.6) (13.6-17.0) (15.0-19.0 10-day (4.5529) (5.476.47) (6. 5 7598) (7. 8 9821) (9.22-10.9) (10.4-12.4) (11.6-13.9) (12.8-15.5) (14.5-137.8) (15.9- 9.7) 20-day (6. 2--67..0) (7.308.41) (8.80-10.2) (9.97- 1.5) (11.613.4) (128--14.8) (14.016.3) (152-17.9) (16.9- 0.0) (1821021.7) 14.4 30-day (7.5--08.61) (8.9610.2) (10.6-12.1) (11.8-13.5) (134- 5.3) (14.6-16.7) (157--18.1) (16.9-19.5) (18.3-21.3) (193722.7) 45.18y (9.50-10.7) (11.2 2.7) (131314.8) (14.5- 6.4) (16.3- 8A) (176- 9.9) (18.9)21.4) (20.022.9) (21?5-24.7) (22?6-8.1) 60 (11 2-12.6) (137-14.8) (152-17.0) (167- 8.7) (18.6- 0.9) (20A 22.5) (213-24.0) m 25.5) (242127.4) (25217 8.8) t 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) vnll 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 hftps://hdsc.nws.noaa.govlhdsctpfdstpfds_printpage.html?lat=38.1185&Ion=-78.2308&data=depth&units=english&series=pds#table 1/4