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HomeMy WebLinkAboutWPO201100071 Calculations 2023-03-08Re-Store'N Station WPO Amendment ALBEMARLE COUNTY, VIRGINIA HYDROCAD CALCULATIONS MARCH 2, 2023 • �a TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Jonathan Showalter, PE Timmons Group 608 Preston Ave STE 200 Charlottesville, VA 22903 434.327.1681 o : u'�ATHA\ M. SHOWALTER 9 I.Ic. No. 040=057151 03/02/2023 ksSIO,YA L LQ 13S PR-4�Inpea Min Tc G IW Won i4S POM- 4vOnpM Min Tc BS 10S 9S 5S uoai a 2 opaa UM Mai- 11S udlmN�a1 poot - PR ap¢a U Mw[M Naa 3- U l Pre ceWaps� alaWa�eaM 1S 4P O PR . ZS 4�Pea Pont of M8h34 PR-02v¢IOp.`a Subcat Reach Aon Llnk Post oMd PI t O 7L Unal¢WavclMaJ - P. 4vMopW Pdnlof PoM uevaopea �7,b Storm Calcs - Restore N Station Prepared by Timmons Group Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1 Year Type II 24-hr Default 24.00 1 3.06 2 2 10 Year Type II 24-hr Default 24.00 1 5.56 2 3 100 Year Type II 24-hr Default 24.00 1 9.05 2 Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 3.390 98 (1S, 2S, 5S, 11S, 13S, 14S) 7.840 69 (1S, 2S, 6S, 8S, 9S, 10S, 13S, 14S) 11.230 78 TOTAL AREA Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 11.230 Other 1S, 2S, 5S, 6S, 8S, 9S, 10S, 11S, 13S, 14S 11.230 TOTAL AREA Printed 3/2/2023 Storm Caics - Restore N Station Prepared by Timmons Group Ground Covers (all nodes) Printed 3/2/2023 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 11.230 11.230 1S, 2S, 5S, 6S, 8S, 9S, 10S, 11 S, 13S, 14S 0.000 0.000 0.000 0.000 11.230 11.230 TOTAL AREA Storm Calcs - Restore N Station Prepared by Timmons Group Pipe Listing (all nodes) Printed 3/2/2023 Line# Node In -Invert Out -Invert Length Slope n Width Diam/Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 4P 671.00 670.00 100.0 0.0100 0.013 0.0 15.0 0.0 Storm Calcs - Restore N Station Type 11 24-hr 1 Year Rainfall=3.06" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 7 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>1.51" Tc=6.0 min CN=85 Runoff=6.80 cfs 0.305 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>0.71" Tc=6.0 min CN=71 Runoff=2.97 cfs 0.131 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 Runoff=1.76 cfs 0.094 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.70 cfs 0.032 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.16 cfs 0.007 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.16 cfs 0.007 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.70 cfs 0.032 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.13 cfs 0.007 of Subcatchmentl3S: Pre -Developed Min Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>0.71" Flow Length=615' Tc=4.0 min CN=71 Runoff=3.22 cfs 0.131 of Subcatchmentl4S: Post -Developed Min Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>1.51" Flow Length=830' Tc=4.8 min CN=85 Runoff=7.17 cfs 0.305 of Pond 4P: Pond 1 Peak Elev=675.45' Storage=6,315 cf Inflow=9.24 cfs 0.431 of Primary=1.89 cfs 0.430 of Secondary=0.00 cfs 0.000 of Outflow=1.89 cfs 0.430 of Link 7L: Post Developed Point of Analysis Inflow=1.95 cfs 0.437 of Primary=1.95 cfs 0.437 of Link 12L: Pre Developed Point of Analysis Inflow=3.96 cfs 0.177 of Primary=3.96 cfs 0.177 of Total Runoff Area = 11.230 ac Runoff Volume = 1.051 of Average Runoff Depth = 1.12" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 6.80 cfs @ 11.97 hrs, Volume= 0.305 af, Depth> 1.51" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length 0 Capacity Description Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph I ----r--'------'---I---' I I I I I I B.W ch Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=2.420 ac Runoff Volume=0.305 of Runoff Depth>1.51" I I I I Tc=6.0 min_I 1 __J___L__1___I___1__I. I I I I I I I CN=85 I I I I I I I I Time (houm) I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I -- I I I I I I I I I I I I I I I I I I I I I - ------------------------- I I I I I G Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 2S: Pre - Developed Runoff = 2.97 cfs @ 11.98 hrs, Volume= 0.131 af, Depth> 0.71" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description lmin) lfPPfi /ff/ff1 !ff/carl /rfcl 6.0 Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph 297 cN 3 Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=2.220 ac 2 Runoff Volume=0.131 of Runoff Depth>0.71" LL Tc=6.0 min C N=71 r ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 1.76 cfs @ 11.96 hrs, Volume= 0.094 af, Depth> 2.68" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph ■ Runoff Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=0.420 ac Runoff Volume=0.094 of 1 Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 0.70 cfs @ 11.99 hrs, Volume= 0.032 af, Depth> 0.62" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph 0.75 I 07 T e1124-hr yp 0.65 1 �, --i 1-Year RainfallT3.06"------ Runoff Area--�OJ610- --- --- ac 0.55 0.5 Runoff VoluMe==0.032 of- 045 Runoff Depth>0.62"---r--? 0.4 LL 0.35 n Flow Leth 00 g =1 r 0.3 I I i i Tc=6.0 min 0.25 I I CN=69i r , 02 �-' I I i I 0.15 i i i i I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 0.16 cfs @ 11.99 hrs, Volume= 0.007 af, Depth> 0.62" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph 0.18 I ._-___I__ - 0.17.' IL--;-- o.16 hlrl--- I I Type 11124- --i---I , 0.15 1 I I I 1 I I j.yerR'alnfaljT06-I-----T0.14 I .-II___�_�_pr_w_y,___r_//_-�7__,,��_//1_-�__r__,___r__7 0.13 -RunlofF*Area^V77W ac-7---r--r 0.12 _ F__,_ I Run:ofFVglumel=U:O07�f=_1___; 0.11 01 Runoff Depth>0.62" 0.09 ---i-----1---iI ° 0.08 LL Flow Length_=1Q0' 1 1 - 0.07 Y r r__r .r--- 1___r I� �; MIM-11 //_ma�y _1r--r---r--i-----r---1---T 0.05 _ - C _69:-- --- --;-- - -----1---i 0.04 0.03 �I 1 __J___I_ 0.02 _}-----IF __ -------- -- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 0.16 cfs @ 11.99 hrs, Volume= 0.007 af, Depth> 0.62" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph 0.18 - T, 'r--;-- o.16 - Type II'24-hlr__--- ', --- 'i' 1 j.yearR'alnfaljT3.06"- I ---I --T 0.14 .-II___�_�_pr_w_y,___r_//_-�7__,,��--- 0.13 -�__r__,___r__7 -Run:ofF*Area^V77W ac-7---r--r 0.12 _ F__,_ + Run�ofFVglume,=U:O07�f=_,___; 0.11 01 Runoff Depth>0.62" J, 0.09 ---i--------'i ° 0.08 LL Flow Length_=1Q0' - - 0.07 Y r r__r .r--- r__r I� �; MIM-; 0.06 r--r---r--i-----r---i---T -C _ -1 i 0.02 -----�F __ T ------ --- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 0.70 cfs @ 11.99 hrs, Volume= 0.032 af, Depth> 0.62" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph 0.75 I 07 T e1124-hr yp 0.65 1 �, --i 1-Year RainfallT3.06"------ Runoff Area--�OJ610- --- --- ac 0.55 0.5 Runoff VoluMe==0.032 of- 045 Runoff Depth>0.62"---r--? 0.4 LL 0.35 n Flow Leth 00 g =1 r 0.3 I I i i Tc=6.0 min 0.25 I I CN=69i r , 02 �-' I I i I 0.15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.13 cfs @ 11.96 hrs, Volume= 0.007 af, Depth> 2.68" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 0.14 0.13 rr Y Type II, 24-hr _1----- -- T 1 i i 0.12 1 all=3.06" 0.11 ° ------ -A--f ------- A ___ Runoff Area=0 030 ac 009 Runoffl VpluMe==0.007 of II — 0.08 I I I Rtmoff Depth>2.68" 0.07 ° v 0.06 1 1 1 1 Flow t0ngth1=1001--- `--A --- ' I I 0.05 ' Tc=6.011 m,n 1 1 0.04 ' CN=981 0.03 1 I I I I I 1 0.02 1 i I I i I I 1 --JI -- -;L 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 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 13S: Pre - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt Runoff = 3.22 cfs @ 11.96 hrs, Volume= 0.131 af, Depth> 0.71" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Min Tc Calculation Hydrograph ❑ Runaff 3 Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=2.220 ac Runoff Volume=0.131 of 2—Runoff Depth>0.71" Flow Length=615' Tc=4.0 min CN=71 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 14S: Post - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt Runoff = 7.17 cfs @ 11.95 hrs, Volume= 0.305 af, Depth> 1.51" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, Area= 0.8 sf Perim= 3.1' r= 0.26' n= 0.013 Subcatchment 14S: Post - Developed Min Tc Calculation 8 Type 11 24-h r 1 Year Rainfall=3.06'" + 6 Runoff Area=2.420 at Rune 5 " ,off Volume=0.305 of Runoff Depth>1.51" ----- 4 Flow Length=830' 3 Tc=4.8 min CN=85 - --- ;-- 2 1 � � ❑Runoff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 1.50" for 1 Year event Inflow = 9.24 cfs @ 11.97 hrs, Volume= 0.431 of Outflow = 1.89 cfs @ 12.16 hrs, Volume= 0.430 af, Atten= 80%, Lag= 11.2 min Primary = 1.89 cfs @ 12.16 hrs, Volume= 0.430 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 675.45' @ 12.16 hrs Surf.Area= 2,377 sf Storage= 6,315 cf Plug -Flow detention time= 26.9 min calculated for 0.430 of (100% of inflow) Center -of -Mass det. time= 26.2 min ( 799.5 - 773.3 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Type ll 24-hr 1 Year Rainfall=3.06" Prepared by Timmons Group Printed 3/2/2023 Primary OutFlow Max=1.89 cfs @ 12.16 hrs HW=675.45' (Free Discharge) L1=Culvert (Passes 1.89 cfs of 8.66 cfs potential flow) �2=Orifice (Orifice Controls 1.89 cfs @ 9.62 fps) 3=Grate ( Controls 0.00 cfs) 5=10 yr Orifice ( Controls 0.00 cfs) econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=671.20' (Free Discharge) =Spillway ( Controls 0.00 cfs) Pond 4P: Pond 1 Hydrograph rt__ t__y__ y__ y___ I I I I I I I I I sea Inflow Area=3.450 ac Peak Elev=675,45' Storage�-6)315 cf, I I I I I I I I I I I I I I I I I I I I I I I 1__J__.. I I I I I I I I I 1 89 d --r--r--r--r--r--r--�------- �a�� 7 8 9 10 11 Time (hours) I I I I I I I I I I I - - - I I I - - - 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 ■ outflow ■ Primary ■ Secondary Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 1.46" for 1 Year event Inflow = 1.95 cfs @ 12.07 hrs, Volume= 0.437 of Primary = 1.95 cfs @ 12.07 hrs, Volume= 0.437 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 0.71" for 1 Year event Inflow = 3.96 cfs @ 11.98 hrs, Volume= 0.177 of Primary = 3.96 cfs @ 11.98 hrs, Volume= 0.177 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs - Restore N Station Type 1124-hr 10 Year Rainfall=5.56" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 22 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>3.64" Tc=6.0 min CN=85 Runoff=15.61 cfs 0.733 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>2.34" Tc=6.0 min CN=71 Runoff=9.76 cfs 0.432 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 Runoff=3.24 cfs 0.177 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=2.52 cfs 0.110 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.58 cfs 0.025 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.58 cfs 0.025 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=2.52 cfs 0.110 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.23 cfs 0.013 of Subcatchmentl3S: Pre -Developed Min Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>2.34" Flow Length=615' Tc=4.0 min CN=71 Runoff=10.66 cfs 0.433 of Subcatchmentl4S: Post -Developed Min Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>3.64" Flow Length=830' Tc=4.8 min CN=85 Runoff=16.40 cfs 0.733 of Pond 4P: Pond 1 Peak Elev=677.66' Storage=12,798 cf Inflow=21.33 cfs 1.020 of Primary=10.93 cfs 1.019 of Secondary=0.00 cfs 0.000 of Outflow=10.93 cfs 1.019 of Link 7L: Post Developed Point of Analysis Inflow=11.24 cfs 1.044 of Primary=11.24 cfs 1.044 of Link 12L: Pre Developed Point of Analysis Inflow=13.06 cfs 0.581 of Primary=13.06 cfs 0.581 of Total Runoff Area = 11.230 ac Runoff Volume = 2.792 of Average Runoff Depth = 2.98" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 15.61 cfs @ 11.97 hrs, Volume= 0.733 af, Depth> 3.64" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph 17 16 15 Type 11 24-hr ---I -I I I I I I I I 10. 10 Year Rainfall=5.56" r 13 12 Runoff Area=2.420 ac ---- -- -- r 11 Runoff Volume=0.733 of 10 Runoff Depth>3.64'�---, - ------I, ° 8 Tc=6.0 min -- __ __ _ I_ _ • - f -y -F -i -I -I -+ -I -4 -y LL N-85 -- L--,---I ---L-- L--L L s — I I I I I I I I I I 5 I I I 4 I L 3 II -I -----I_I __I -I -I -I2 IL___ I___ L___I___L__J___L__�___I L__J___I III I I00 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Summary for Subcatchment 2S: Pre - Developed Runoff = 9.76 cfs @ 11.97 hrs, Volume= 0.432 af, Depth> 2.34" Routed to Link 12L : Pre Developed Point of Analysis Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph I I I I C Type-u1244 11 , ---'I--- --- -10Year -Rainfaffi=&56" - I I I I Runoff AreaI=2.220 at. --,---r--T---I T---I---r--,---- _Run'off,Vglum, 00.L432 of... Runoft Deptfi>iW' - r--r-T---r--r---r--r- T'c=6.0:min I CN=;71 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I J 1 011121314151617181920 G Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 3.24 cfs @ 11.96 hrs, Volume= 0.177 af, Depth> 5.05" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length Slope Velocity Capacity Description in\ If --A /f1/f1\ /f1loon\ Info\ 6.0 100 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph 0 Runoff Type II 24-hr 3 10 Year Rainfall=5.56" Runoff Area=0.420 ac Runoff Volume=0.177 of 2—Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 2.52 cfs @ 11.98 hrs, Volume= 0.110 af, Depth> 2.17" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A /f1/f1\ /f1loon\ Info\ 6.0 100 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph Type II 24-hr 10 Year Rainfall=5.56" 2 Runoff Area=0.610 ac Runoff Volume=0.110 of Runoff Depth>2.17" Flow Length=100' 1 Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 0.58 cfs @ 11.98 hrs, Volume= 0.025 af, Depth> 2.17" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN ' 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph 1 i i I I I 1 i I I I 1 i i I I I 1 i 0.6 1 1 1 01.se as 1 T e-H' YID ht�- ,---- --r----r--,---�--r--,---�--,-- _ -r 0.55 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10 Year Rainfall=5.56 T r r ' 0.5 1 1 1 1 i 0.45 RunoffAeea=0]140 ac 1 Runoff Volume=0.025 of 1 r ' oa 1 1 1 1 0 0.35 Runoff Depth>2.17" j j r 1 I 1I 1 1 1 1 i i 1 1 1 1 i LL 03 Flow Length1=100' 1 1 r __r__l___i __7__7___r__7__ 025 — n 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 oz CN=69 -- 1 I i 1 0.15 1 1 1 1 1 1 1 01 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.05 1 1 1 1 1 1 1 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 0.58 cfs @ 11.98 hrs, Volume= 0.025 af, Depth> 2.17" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" a (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length Slope Velocity Capacity Description 6.0 100 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph 1 i i I I I 1 i I I 1 0.6 1 0.55 + Mp' 1 1 I 1 I I 1 u 1 i� _-T---------r---1- --T I I I 1 0.5 10 Year Rainfall=5.56 T 0.45unoff RAfeal_ _ �=OJ140 ac 0.4 Runoff Volume=0.025 of u 0.35 Runoff Depth>2.17" ° 03 Flow Length1=100' LL T 025 I 1 Tc=6.0 min --1 I 02 1 1 1 1 CN=69 -- 1 1 0.15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 01 1 1 1 1i 1i 1 1 1 1 1 r 1 1 T r___r--r, 0.05 ! ,JI 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 2.52 cfs @ 11.98 hrs, Volume= 0.110 af, Depth> 2.17" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A Mtf1\ /f l.o \ Info\ 6.0 100 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph ■ Runoff Type II 24-hr 10 Year Rainfall=5.56" 2 Runoff Area=0.610 ac Runoff Volume=0.110 of Runoff Depth>2.17" Flow Length=100' 1 Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.23 cfs @ 11.96 hrs, Volume= 0.013 af, Depth> 5.05" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 1 0.25 I 1 1 I I I I 0.24 0.23 1---`--+------`--+---I-- Type II}24-hrr- --- 1--- 0.22 --y11 02 10 Year Rainfall=5.56" ]---i---i 0.2 ' 019 Rwhoff A�`ea=�0..,030-ac -- 0.18 1 0.17 0.16 ' 1 1 -Runoff VglUrne=O'01a of 0.15 ... 0.14 -----------------------------r---Ii--r Runoff De 5.05" �I p-t1h > 1 0.13 -- - - - - -- - ____-----r---i---r --r 0 0.12---`--+---I---+ Length_=1Q0_--_; LL 0.11 -F1oW -----'r 0.1 0.09 I r r--1---I---r---I---r--r 0.08 + -J -L -+ _I _I 1 1 1 0.06 -+ _J _L _+ _I _L 0.041 _a______+__+___+__;___I___F__�___I___ 1 1 I 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 13S: Pre - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt Runoff = 10.66 cfs @ 11.95 hrs, Volume= 0.433 af, Depth> 2.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Min Tc Calculation Hydrograph __ �___ ■Runoff 11 —— ————— 1066 cfs Type II 24-hr ---- 0 10 Year Rainfall=5.56" - 9 Runoff Area=2.220 ac - 8 Runoff Volume=0.433 of - Runoff Depth>2.34" - 5 Flow Length=615' - 4 Tc=4.0 min --- 3 CN=71 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 14S: Post - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt [471 Hint: Peak is 227% of capacity of segment #3 Runoff = 16.40 cfs @ 11.95 hrs, Volume= 0.733 af, Depth> 3.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, 4.8 830 Total Subcatchment 14S: Post - Developed Min Tc Calculation Hydrograph 18 __' __J__ ❑Runoff I r---I- --1 __' 17 I i8A0 de � _ I___r___'I______ r__ 1___ r__ l___ I I I I I I I I I I I I I TXRe u;24�hr 16 15 -10 )!eaiRahifalk-&5-6i`r__; __ ;___,_ ,___-__ ___; __ ___, __ ;___ 14 13 I_,_nei//_�///_���q_J(l�___L__J___L -RunafFAeea�' x2.0at-_L__J___L ___I___1___I___ L__I___ L__J___ 12 Runoff VolI urne0.73-- ----F --I- - -- ----7 - V 16 r „ 4rr II I I I I I I I I I I Runoff De th>3.61 3 g I I I I I I I I I I I I-- ° Flow Len th=830'1--,I---, --, - -----------r--,I---Ir--,--- LL8 g 7 Tc=4.8min ----' 6 5 CN=85i-------L------ -- --- -- ---1 ------------L-----'L-- 4 11I I I 1___I___L--- I--- L __J___I ___ I___ 1__I--- L__I--- L__J_ 3 I 21 I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 3.55" for 10 Year event Inflow = 21.33 cfs @ 11.97 hrs, Volume= 1.020 of Outflow = 10.93 cfs @ 12.07 hrs, Volume= 1.019 af, Atten= 49%, Lag= 6.2 min Primary = 10.93 cfs @ 12.07 hrs, Volume= 1.019 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 677.66' @ 12.07 hrs Surf.Area= 3,541 sf Storage= 12,798 cf Plug -Flow detention time= 24.0 min calculated for 1.019 of (100% of inflow) Center -of -Mass det. time= 23.4 min ( 781.7 - 758.4 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Primary OutFlow Max=10.85 cfs @ 12.07 hrs HW=677.62' (Free Discharge) L1=Culvert (Inlet Controls 10.85 cfs @ 8.84 fps) �2=Orifice (Passes < 2.35 cfs potential flow) 3=Grate ( Controls 0.00 cfs) 5=10 yr Orifice (Passes < 8.70 cfs potential flow) econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=671.20' (Free Discharge) =Spillway ( Controls 0.00 cfs) Pond 4P: Pond 1 Hydrograph Inflow Area=;3.450 ac 22 --- I 20 --r--*-- Storati"12,798_d 18 I I I I I I I I I I I I I I I I I I I I I I 16 I I I I I I I I I I I I I I I I I I I 14--i--i--T--T--T--T--i' 1093 10 93 01 V __ I___I__I __I__I__I__I__ _ 12 I I I I I I I 3 I I I I I I I O ' L__L__L__1__1__1__1__1_ u_ 10 I I I I I I I I I I I 8 I I I I 7 8 9 10 11 Time (hours) Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 3.49" for 10 Year event Inflow = 11.24 cfs @ 12.06 hrs, Volume= 1.044 of Primary = 11.24 cfs @ 12.06 hrs, Volume= 1.044 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph ___________________I___I� - ❑Inflow n2a �N �J__ �_ ❑Primary 12 I I I I I I I ii2a ots Inflow Area-3.59 a 11- I I I I I I I I 10 I I I I I I L__J___I___L__ I I I I I I I I I I I 9 I I I I I I J___IL__1__J___L__L__J___L__1__ ._L__J__J___L__J___I___L__ I I I I I I I I I I I I I I I I I L__ I I I I I I I I I I I I I I I I I y I I I I I I I I I I I I I I I I I p6 I I I I I I I I I I I LL I I I I I I I I 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 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 2.32" for 10 Year event Inflow = 13.06 cfs @ 11.97 hrs, Volume= 0.581 of Primary = 13.06 cfs @ 11.97 hrs, Volume= 0.581 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph -- _-_� __�__;---i __�__�___�__ ■Inflow 14 --r- +s.oe as—*-------r--7---r--r-- ■Primary Inflow Area=&000-ate '-- 1 --- -- i-- I - - I I I 1z I I I I I I I T -� � II I I I I I I I r r r 8 I I I I 7 , r---r--r--r---r--r-r--r---r--r-----------r-- r--r - - -r - -r 6 -- LL I I I I I I I I I 5__*___---r--t------r--*-----r--*__ __*__-___�___*--------r-- q I I 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___�___r__•__y___r__t_ -''--------*--r------r-- 3 - --� o -I 7 8 9 10 11 Time (hours) Storm Calcs - Restore N Station Type 1124-hr 100 Year Rainfall=9.05" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 37 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>6.80" Tc=6.0 min CN=85 Runoff=27.96 cfs 1.371 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>5.11" Tc=6.0 min CN=71 Runoff=20.73 cfs 0.946 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>8.37" Flow Length=100' Tc=6.0 min CN=98 Runoff=5.28 cfs 0.293 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=5.47 cfs 0.248 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=1.25 cfs 0.057 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=1.25 cfs 0.057 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=5.47 cfs 0.248 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>8.37" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.38 cfs 0.021 of Subcatchmentl3S: Pre -Developed Min Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>5.11" Flow Length=615' Tc=4.0 min CN=71 Runoff=22.51 cfs 0.946 of Subcatchmentl4S: Post -Developed Min Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>6.80" Flow Length=830' Tc=4.8 min CN=85 Runoff=29.34 cfs 1.372 of Pond 4P: Pond 1 Peak Elev=679.78' Storage=21,765 cf Inflow=38.70 cfs 1.912 of Primary=12.65 cfs 1.761 of Secondary=15.39 cfs 0.148 of Outflow=28.04 cfs 1.909 of Link 7L: Post Developed Point of Analysis Inflow=13.75 cfs 1.818 of Primary=13.75 cfs 1.818 of Link 12L: Pre Developed Point of Analysis Inflow=27.82 cfs 1.271 of Primary=27.82 cfs 1.271 of Total Runoff Area = 11.230 ac Runoff Volume = 5.558 of Average Runoff Depth = 5.94" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 27.96 cfs @ 11.96 hrs, Volume= 1.371 af, Depth> 6.80" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph ———————————————————- 1___L__J--- L__1--- L——L --- ---------- L__J--- L------ 30 I ,___r___I___r___I___�__�__ 2)96 cfs 28 I -T�p�*246I I hr1___I___L__ 26 I I 11- 24 22 Run'off! Area=2.420 at 20 Runoff Volume=1.371 of 18 - I---r -- r -- 1--- V 16 Runoff Depth>6.80" r 3 _ _IL _1 _I. _L _J _L _J _L _J ° 14 LL Tc=6.0 min I I I I I I I I I I I I 12 CN=Q5I 9 10 I I I I I I I I I I I I I I I I I I I I I I 8 I 6 I I I I I I I I I I I I I I 4 I I I I I I I 2 I I I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ RunoH Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 100 Year Rainfall=9.05" Summary for Subcatchment 2S: Pre - Developed Runoff = 20.73 cfs @ 11.97 hrs, Volume= 0.946 af, Depth> 5.11" Routed to Link 12L : Pre Developed Point of Analysis Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description " 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41% Impervious Area Tc Length Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph 23 , _ 22 I --I---I ---I---I---I i___L__i____ 20."$ __________ ------ --- --- 21 ' `I - 20 -T-;�j1E-IIT��!6`•'T---�'I---r------- - - -'r ---I---r------r-----'r--;--- '9 IN Year RainfaIN:9-057 18 ,7 p' y� pI-Ins�/I� 71� '_ ---I---r---;---r---II---ir--;--- 16 =rYun1dff rtW#2.220_aL.____1 =--- I I I I I I I I --I--- �---I--- I--, ---I---I--- 12 ' 0 11 I I I I I I I I - r -. I I I I I I I M 10 C • � limi ---I I I I I I I -- I I I 9 CN =71' - - - -; -- L- ;-I -- 8 --'-r--T---I---r--_i___r__�___�__T___i_ 6 i 5 __Y___r__y___I___t___I___r__y___r__y___I ' q I __!___L__1_______I ___ I I _______ I__________. I I I I I I 3 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 5.28 cfs @ 11.96 hrs, Volume= 0.293 af, Depth> 8.37" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph I 5 Type II 24-hr 100 Year Rainfall=9.05" 4 Runoff Area=0.420 ac i Runoff Volume=0.293 of 3 Runoff Depth>8.37"t ° Flow Length=100'I LL i 2 Tc=6.0 min ' I I I II CN=98 I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 rl— A A Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 5.47 cfs @ 11.97 hrs, Volume= 0.248 af, Depth> 4.87" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 100 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph 1 Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.610 ac Runoff Volume=0.248 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 1.25 cfs @ 11.97 hrs, Volume= 0.057 af, Depth> 4.87" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph ■ Runoff Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.140 ac Runoff Volume=0.057 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 1.25 cfs @ 11.97 hrs, Volume= 0.057 af, Depth> 4.87" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A Mtf1\ /f l.o \ Info\ 6.0 100 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph ■ Runoff Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.140 ac Runoff Volume=0.057 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 rl— A A Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 5.47 cfs @ 11.97 hrs, Volume= 0.248 af, Depth> 4.87" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 100 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph 1 Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.610 ac Runoff Volume=0.248 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.38 cfs @ 11.96 hrs, Volume= 0.021 af, Depth> 8.37" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 0.42 -r -r r -T 0.4 0.38 Type 11' 24-hlrf-- - 7 o.3s -------- 034 : 100 Year Rainfal"- 51 ---I- --t 0.32 . 1 __---'---` 0.3 Runoff Area=0.030 ac ----, 0.28 0.26 Runoff Volume=0.021 of 0.22 Runoff Depth>8.37"__== ° 02 Flow Length=100'-- ` 0.16 Tc=6.0 min 0.14 0.12 '' CN=98'---11---'I-1------=--=---I -- 0.06 I _l _I _L _J _L _1 _I _L _J _I _1 0.06 -r -- -; I 0.04 I- I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) I ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 13S: Pre - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt Runoff = 22.51 cfs @ 11.94 hrs, Volume= 0.946 af, Depth> 5.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Min Tc Calculation Hydrograph ___ u 23 22 Type II 24-hr '--- 21 20 -r , -100 Year Rainfall--;-9 06', -- ---L 19 -----I--- r---r--r------r--�---r 18 -Runoff Aeea-2.220 ad -- --;-__I, 16 Vo-lume-0.940 of 15 -Runoff ....... 14 rrl---;--- k%&111__a___L____ .�".. 13 _R(Muffi D--- 3 0 12 I rr__,___r FlovV Lrengfh=6T5-L---;--- 11 --;--- 10 --r--r__,___r--�---r 9 Tc=4.0 min ---I--- L__J___ L__J___I_ I I 7 �j _^IN-I______I___L___I___L__1___I_ I I I I 5 ___________ 1___'___L__J___L__1__ 1'1' I I I 1 4 1___ I _- _______rr____y_i__ 3 _______ I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ RunoH Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 14S: Post - Developed Min Tc Calculation [491 Hint: Tc<2dt may require smaller dt [471 Hint: Peak is 406% of capacity of segment #3 Runoff = 29.34 cfs @ 11.95 hrs, Volume= 1.372 af, Depth> 6.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, M 32 30 28 26 24 22 20 L 18 16 0 14 12 830 Total Subcatchment 14S: Post - Developed Min Tc Calculation Hydrograph Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=2.420 ac Runoff Volume=1.37? of Runoff Depth>6.80"-- - Flow Length=830' - Tc=4.8 min --- -I---I--------- 7 CN=85- I I I i I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 6.65" for 100 Year event Inflow = 38.70 cfs @ 11.96 hrs, Volume= 1.912 of Outflow = 28.04 cfs @ 12.04 hrs, Volume= 1.909 af, Atten= 28%, Lag= 4.7 min Primary = 12.65 cfs @ 12.04 hrs, Volume= 1.761 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 15.39 cfs @ 12.04 hrs, Volume= 0.148 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 679.78' @ 12.04 hrs Surf.Area= 5,013 sf Storage= 21,765 cf Plug -Flow detention time= 23.7 min calculated for 1.909 of (100% of inflow) Center -of -Mass det. time= 23.0 min ( 769.2 - 746.2 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Primary OutFlow Max=12.63 cfs @ 12.04 hrs HW=679.75' (Free Discharge) L1=Culvert (Inlet Controls 12.63 cfs @ 10.29 fps) 2=Orifice (Passes < 2.72 cfs potential flow) 3=Grate (Passes < 27.58 cfs potential flow) 5=10 yr Orifice (Passes < 13.09 cfs potential flow) econdary OutFlow Max=14.56 cfs @ 12.04 hrs HW=679.75' (Free Discharge) =Spillway (Weir Controls 14.56 cfs @ 2.66 fps) Pond 4P: Pond 1 Hydrograph -inflow Arir_ea_=3_.450-aC--- 42 41 38 36 34 a3forr je-4`CrZg5 of -- se.oa ors 32 30 28 I I I 26 L^ 24L--L--L --L--L--L--L--i--J--J-- .V.. 22 020 ' / 14 __L__L__L__1__1__1__1__1__J_ 12 10-L--L--L- 8 / 7 8 9 10 11 Time (hours) Printed 3/2/2023 __ --------------- ■Inflow ■ Primary ■Secondary I ------------ I I I I I I I I__ I__ I___I___I___I___ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 6.08" for 100 Year event Inflow = 13.75 cfs @ 12.01 hrs, Volume= 1.818 of Primary = 13.75 cfs @ 12.01 hrs, Volume= 1.818 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph --r---r--r--�-- - I I I I ' ' ' ' ' ' ' ' ' ❑ Inflow -J---L--L-- 15 ---_____------`--------`--❑Primar y Inflow Area=3.890-ate 13. ch 14 I I I I 13 I i I I I I 12 I I I I i i i I I I i i I I I I 1a I I I I I I I I I I I 8 I I I I I I I I I I I p 7 __ __ ___ __ ___i___i___ i___I___ I I__II—II II I II i i i I LL I I I I i i i I I I i i i I I 6 I I I I I I I I I I I 5 I I I I I I I I I I I a __7__-I___'7 __7___r___r__r_ _______r__r___I___r__ L__1__J___L__L__J___L__L_-__J___I___L- 3 2 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 5.08" for 100 Year event Inflow = 27.82 cfs @ 11.97 hrs, Volume= 1.271 of Primary = 27.82 cfs @ 11.97 hrs, Volume= 1.271 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph I nflowr Area=3.006- ac - E 28 --1--L---'---1--J---L--L--J---L--L- 26 I I I I I I I I I I I I I I I I I I I I 24 __T___I___T--T---r--r--r--T---r--r- I I I 22 I I I I I I I I I 20 I I I I I I I I I I I I I I '-' 16 I I I I I I I I c I I I I _T 14 T T LL I I I I I 12 I I I I I I I I I 10 - __ I_________ ___I___I___I __ I___I___ _ I I I I I I I I I I I I I I I I I B I _1 _I _I _1 _J _L _L g I I I I I I I I I I 4 -I T 2 6 0 1 2 3 4 5 6 7 8 9 10 11 Time (hours) FE ]—I n—fl.—. ---I-I ❑ Primary -II IF I I I I I I I I I I I I I I I I I I I I I I I I I __I__ I__ I___I __ I_________ I I _T _T I _1 I 13S PR-02v IoMd Tc i4S Ppq-4v¢Iap¢G TC BS 10S 9S 5S uml a 2 \ oam um Nea 3- UnEIeWMONeat- 11S PR ap¢p U slw[M Naa 3- dlwo d l Pre ceWtgm alawro aae 1S 4P O PR . ZS 4�oPm PdM of M8h34 PR-DevelOpm Subcat Reach Aon Llnk Post olxe plot O7dIIIIL U.dKWNmN .3- Posl4ve4oP IPoint of PoM l3e.*Wen / "K Storm Calcs - Restore N Station Prepared by Timmons Group Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1 Year Type II 24-hr Default 24.00 1 3.06 2 2 10 Year Type II 24-hr Default 24.00 1 5.56 2 3 100 Year Type II 24-hr Default 24.00 1 9.05 2 Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 3.390 98 (1S, 2S, 5S, 11S, 13S, 14S) 7.840 69 (1S, 2S, 6S, 8S, 9S, 10S, 13S, 14S) 11.230 78 TOTAL AREA Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 11.230 Other 1S, 2S, 5S, 6S, 8S, 9S, 10S, 11S, 13S, 14S 11.230 TOTAL AREA Printed 3/2/2023 Storm Caics - Restore N Station Prepared by Timmons Group Ground Covers (all nodes) Printed 3/2/2023 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 11.230 11.230 1S, 2S, 5S, 6S, 8S, 9S, 10S, 11 S, 13S, 14S 0.000 0.000 0.000 0.000 11.230 11.230 TOTAL AREA Storm Calcs - Restore N Station Prepared by Timmons Group Pipe Listing (all nodes) Printed 3/2/2023 Line# Node In -Invert Out -Invert Length Slope n Width Diam/Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 4P 671.00 670.00 100.0 0.0100 0.013 0.0 15.0 0.0 Storm Calcs - Restore N Station Type 11 24-hr 1 Year Rainfall=3.06" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 7 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>1.51" Tc=6.0 min CN=85 Runoff=6.80 cfs 0.305 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>0.71" Tc=6.0 min CN=71 Runoff=2.97 cfs 0.131 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 Runoff=1.76 cfs 0.094 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.70 cfs 0.032 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.16 cfs 0.007 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.16 cfs 0.007 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>0.62" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.70 cfs 0.032 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.13 cfs 0.007 of Subcatchmentl3S: Pre -Developed Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>0.71" Flow Length=615' Tc=4.0 min CN=71 Runoff=3.22 cfs 0.131 of Subcatchmentl4S: Post- DevelopedTc Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>1.51" Flow Length=830' Tc=4.8 min CN=85 Runoff=7.17 cfs 0.305 of Pond 4P: Pond 1 Peak Elev=675.45' Storage=6,315 cf Inflow=9.24 cfs 0.431 of Primary=1.89 cfs 0.430 of Secondary=0.00 cfs 0.000 of Outflow=1.89 cfs 0.430 of Link 7L: Post Developed Point of Analysis Inflow=1.95 cfs 0.437 of Primary=1.95 cfs 0.437 of Link 12L: Pre Developed Point of Analysis Inflow=3.96 cfs 0.177 of Primary=3.96 cfs 0.177 of Total Runoff Area = 11.230 ac Runoff Volume = 1.051 of Average Runoff Depth = 1.12" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 6.80 cfs @ 11.97 hrs, Volume= 0.305 af, Depth> 1.51" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length 0 Capacity Description Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph I ----r--'------'---I---' I I I I I I B.W ch Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=2.420 ac Runoff Volume=0.305 of Runoff Depth>1.51" I I I I Tc=6.0 min_I 1 __J___L__1___I___1__I. I I I I I I I CN=85 I I I I I I I I Time (houm) I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I -- I I I I I I I I I I I I I I I I I I I I I - ------------------------- I I I I I G Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 2S: Pre - Developed Runoff = 2.97 cfs @ 11.98 hrs, Volume= 0.131 af, Depth> 0.71" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description lmin) lfPPfi /ff/ff1 !ff/carl /rfcl 6.0 Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph 297 cN 3 Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=2.220 ac 2 Runoff Volume=0.131 of Runoff Depth>0.71" LL Tc=6.0 min C N=71 r ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 1.76 cfs @ 11.96 hrs, Volume= 0.094 af, Depth> 2.68" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph ■ Runoff Type II 24-hr 1 Year Rainfall=3.06" Runoff Area=0.420 ac Runoff Volume=0.094 of 1 Runoff Depth>2.68" Flow Length=100' Tc=6.0 min CN=98 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 0.70 cfs @ 11.99 hrs, Volume= 0.032 af, Depth> 0.62" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph 0.75 I 07 T e1124-hr yp 0.65 1 �, --i 1-Year RainfallT3.06"------ Runoff Area--�OJ610- --- --- ac 0.55 0.5 Runoff VoluMe==0.032 of- 045 Runoff Depth>0.62"---r--? 0.4 LL 0.35 n Flow Leth 00 g =1 r 0.3 I I i i Tc=6.0 min 0.25 I I CN=69i r , 02 �-' I I i I 0.15 i i i i I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 0.16 cfs @ 11.99 hrs, Volume= 0.007 af, Depth> 0.62" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph 0.18 I ._-___I__ - 0.17.' IL--;-- o.16 hlrl--- I I Type 11124- --i---I , 0.15 1 I I I 1 I I j.yerR'alnfaljT06-I-----T0.14 I .-II___�_�_pr_w_y,___r_//_-�7__,,��_//1_-�__r__,___r__7 0.13 -RunlofF*Area^V77W ac-7---r--r 0.12 _ F__,_ I Run:ofFVglumel=U:O07�f=_1___; 0.11 01 Runoff Depth>0.62" 0.09 ---i-----1---iI ° 0.08 LL Flow Length_=1Q0' 1 1 - 0.07 Y r r__r .r--- 1___r I� �; MIM-11 //_ma�y _1r--r---r--i-----r---1---T 0.05 _ - C _69:-- --- --;-- - -----1---i 0.04 0.03 �I 1 __J___I_ 0.02 _}-----IF __ -------- -- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 0.16 cfs @ 11.99 hrs, Volume= 0.007 af, Depth> 0.62" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph 0.18 - T, 'r--;-- o.16 - Type II'24-hlr__--- ', --- 'i' 1 j.yearR'alnfaljT3.06"- I ---I --T 0.14 .-II___�_�_pr_w_y,___r_//_-�7__,,��--- 0.13 -�__r__,___r__7 -Run:ofF*Area^V77W ac-7---r--r 0.12 _ F__,_ + Run�ofFVglume,=U:O07�f=_,___; 0.11 01 Runoff Depth>0.62" J, 0.09 ---i--------'i ° 0.08 LL Flow Length_=1Q0' - - 0.07 Y r r__r .r--- r__r I� �; MIM-; 0.06 r--r---r--i-----r---i---T -C _ -1 i 0.02 -----�F __ T ------ --- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 0.70 cfs @ 11.99 hrs, Volume= 0.032 af, Depth> 0.62" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph 0.75 I 07 T e1124-hr yp 0.65 1 �, --i 1-Year RainfallT3.06"------ Runoff Area--�OJ610- --- --- ac 0.55 0.5 Runoff VoluMe==0.032 of- 045 Runoff Depth>0.62"---r--? 0.4 LL 0.35 n Flow Leth 00 g =1 r 0.3 I I i i Tc=6.0 min 0.25 I I CN=69i r , 02 �-' I I i I 0.15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.13 cfs @ 11.96 hrs, Volume= 0.007 af, Depth> 2.68" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 0.14 0.13 rr Y Type II, 24-hr _1----- -- T 1 i i 0.12 1 all=3.06" 0.11 ° ------ -A--f ------- A ___ Runoff Area=0 030 ac 009 Runoffl VpluMe==0.007 of II — 0.08 I I I Rtmoff Depth>2.68" 0.07 ° v 0.06 1 1 1 1 Flow t0ngth1=1001--- `--A --- ' I I 0.05 ' Tc=6.011 m,n 1 1 0.04 ' CN=981 0.03 1 I I I I I 1 0.02 1 i I I i I I 1 --JI -- -;L 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 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Summary for Subcatchment 13S: Pre - Developed Tc [491 Hint: Tc<2dt may require smaller dt Runoff = 3.22 cfs @ 11.96 hrs, Volume= 0.131 af, Depth> 0.71" Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Tc Hydrograph ❑ Runaff Type II 24-hr 3 1 Year Rainfall=3.06" Runoff Area=2.220 ac Runoff Volume=0.131 of 2—Runoff Depth>0.71" Flow Length=615' Tc=4.0 min CN=71 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Summary for Subcatchment 14S: Post - Developed Tc [491 Hint: Tc<2dt may require smaller dt Runoff = 7.17 cfs @ 11.95 hrs, Volume= 0.305 af, Depth> 1.51" Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.06" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, Area= 0.8 sf Perim= 3.1' r= 0.26' n= 0.013 !��icZiit.Ii1 Subcatchment 14S: Post - Developed Tc 8 Type 11 24-h r 1 Year Rainfall=3.06'" + 6 Runoff Area=2.420 at Rune 5 " ,off Volume=0.305 of Runoff Depth>1.51" ----- 4 Flow Length=830' 3 Tc=4.8 min CN=85 - --- ;-- 2 1 � � ■Runoff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 1.50" for 1 Year event Inflow = 9.24 cfs @ 11.97 hrs, Volume= 0.431 of Outflow = 1.89 cfs @ 12.16 hrs, Volume= 0.430 af, Atten= 80%, Lag= 11.2 min Primary = 1.89 cfs @ 12.16 hrs, Volume= 0.430 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 675.45' @ 12.16 hrs Surf.Area= 2,377 sf Storage= 6,315 cf Plug -Flow detention time= 26.9 min calculated for 0.430 of (100% of inflow) Center -of -Mass det. time= 26.2 min ( 799.5 - 773.3 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Type ll 24-hr 1 Year Rainfall=3.06" Prepared by Timmons Group Printed 3/2/2023 Primary OutFlow Max=1.89 cfs @ 12.16 hrs HW=675.45' (Free Discharge) L1=Culvert (Passes 1.89 cfs of 8.66 cfs potential flow) �2=Orifice (Orifice Controls 1.89 cfs @ 9.62 fps) 3=Grate ( Controls 0.00 cfs) 5=10 yr Orifice ( Controls 0.00 cfs) econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=671.20' (Free Discharge) =Spillway ( Controls 0.00 cfs) Pond 4P: Pond 1 Hydrograph rt__ t__y__ y__ y___ I I I I I I I I I sea Inflow Area=3.450 ac Peak Elev=675,45' Storage�-6)315 cf, I I I I I I I I I I I I I I I I I I I I I I I 1__J__.. I I I I I I I I I 1 89 d --r--r--r--r--r--r--�------- �a�� 7 8 9 10 11 Time (hours) I I I I I I I I I I I - - - I I I - - - 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 ■ outflow ■ Primary ■ Secondary Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 1.46" for 1 Year event Inflow = 1.95 cfs @ 12.07 hrs, Volume= 0.437 of Primary = 1.95 cfs @ 12.07 hrs, Volume= 0.437 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 11 24-hr 1 Year Rainfall=3.06" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 0.71" for 1 Year event Inflow = 3.96 cfs @ 11.98 hrs, Volume= 0.177 of Primary = 3.96 cfs @ 11.98 hrs, Volume= 0.177 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs - Restore N Station Type 1124-hr 10 Year Rainfall=5.56" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 22 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>3.64" Tc=6.0 min CN=85 Runoff=15.61 cfs 0.733 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>2.34" Tc=6.0 min CN=71 Runoff=9.76 cfs 0.432 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 Runoff=3.24 cfs 0.177 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=2.52 cfs 0.110 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.58 cfs 0.025 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=0.58 cfs 0.025 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>2.17" Flow Length=100' Tc=6.0 min CN=69 Runoff=2.52 cfs 0.110 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.23 cfs 0.013 of Subcatchmentl3S: Pre -Developed Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>2.34" Flow Length=615' Tc=4.0 min CN=71 Runoff=10.66 cfs 0.433 of Subcatchmentl4S: Post - Developed Tc Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>3.64" Flow Length=830' Tc=4.8 min CN=85 Runoff=16.40 cfs 0.733 of Pond 4P: Pond 1 Peak Elev=677.66' Storage=12,798 cf Inflow=21.33 cfs 1.020 of Primary=10.93 cfs 1.019 of Secondary=0.00 cfs 0.000 of Outflow=10.93 cfs 1.019 of Link 7L: Post Developed Point of Analysis Inflow=11.24 cfs 1.044 of Primary=11.24 cfs 1.044 of Link 12L: Pre Developed Point of Analysis Inflow=13.06 cfs 0.581 of Primary=13.06 cfs 0.581 of Total Runoff Area = 11.230 ac Runoff Volume = 2.792 of Average Runoff Depth = 2.98" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 15.61 cfs @ 11.97 hrs, Volume= 0.733 af, Depth> 3.64" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph 17 16 15 Type 11 24-hr ---I -I I I I I I I I 10. 10 Year Rainfall=5.56" r 13 12 Runoff Area=2.420 ac ---- -- -- r 11 Runoff Volume=0.733 of 10 Runoff Depth>3.64'�---, - ------I, ° 8 Tc=6.0 min -- __ __ _ I_ _ • - f -y -F -i -I -I -+ -I -4 -y LL N-85 -- L--,---I ---L-- L--L L s — I I I I I I I I I I 5 I I I 4 I L 3 II -I -----I_I __I -I -I -I2 IL___ I___ L___I___L__J___L__�___I L__J___I III I I00 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Summary for Subcatchment 2S: Pre - Developed Runoff = 9.76 cfs @ 11.97 hrs, Volume= 0.432 af, Depth> 2.34" Routed to Link 12L : Pre Developed Point of Analysis Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph I I I I C Type-u1244 11 , ---'I--- --- -10Year -Rainfaffi=&56" - I I I I Runoff AreaI=2.220 at. --,---r--T---I T---I---r--,---- _Run'off,Vglum, 00.L432 of... Runoft Deptfi>iW' - r--r-T---r--r---r--r- T'c=6.0:min I CN=;71 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I J 1 011121314151617181920 G Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 3.24 cfs @ 11.96 hrs, Volume= 0.177 af, Depth> 5.05" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length Slope Velocity Capacity Description in\ If --A /f1/f1\ /f1loon\ Info\ 6.0 100 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph 0 Runoff Type II 24-hr 3 10 Year Rainfall=5.56" Runoff Area=0.420 ac Runoff Volume=0.177 of 2—Runoff Depth>5.05" Flow Length=100' Tc=6.0 min CN=98 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 2.52 cfs @ 11.98 hrs, Volume= 0.110 af, Depth> 2.17" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A /f1/f1\ /f1loon\ Info\ 6.0 100 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph Type II 24-hr 10 Year Rainfall=5.56" 2 Runoff Area=0.610 ac Runoff Volume=0.110 of Runoff Depth>2.17" Flow Length=100' 1 Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 0.58 cfs @ 11.98 hrs, Volume= 0.025 af, Depth> 2.17" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN ' 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph 1 i i I I I 1 i I I I 1 i i I I I 1 i 0.6 1 1 1 01.se as 1 T e-H' YID ht�- ,---- --r----r--,---�--r--,---�--,-- _ -r 0.55 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10 Year Rainfall=5.56 T r r ' 0.5 1 1 1 1 i 0.45 RunoffAeea=0]140 ac 1 Runoff Volume=0.025 of 1 r ' oa 1 1 1 1 0 0.35 Runoff Depth>2.17" j j r 1 I 1I 1 1 1 1 i i 1 1 1 1 i LL 03 Flow Length1=100' 1 1 r __r__l___i __7__7___r__7__ 025 — n 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 oz CN=69 -- 1 I i 1 0.15 1 1 1 1 1 1 1 01 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.05 1 1 1 1 1 1 1 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 0.58 cfs @ 11.98 hrs, Volume= 0.025 af, Depth> 2.17" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" a (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length Slope Velocity Capacity Description 6.0 100 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph 1 i i I I I 1 i I I 1 0.6 1 0.55 + Mp' 1 1 I 1 I I 1 u 1 i� _-T---------r---1- --T I I I 1 0.5 10 Year Rainfall=5.56 T 0.45unoff RAfeal_ _ �=OJ140 ac 0.4 Runoff Volume=0.025 of u 0.35 Runoff Depth>2.17" ° 03 Flow Length1=100' LL T 025 I 1 Tc=6.0 min --1 I 02 1 1 1 1 CN=69 -- 1 1 0.15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 01 1 1 1 1i 1i 1 1 1 1 1 r 1 1 T r___r--r, 0.05 ! ,JI 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 2.52 cfs @ 11.98 hrs, Volume= 0.110 af, Depth> 2.17" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A Mtf1\ /f l.o \ Info\ 6.0 100 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph ■ Runoff Type II 24-hr 10 Year Rainfall=5.56" 2 Runoff Area=0.610 ac Runoff Volume=0.110 of Runoff Depth>2.17" Flow Length=100' 1 Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.23 cfs @ 11.96 hrs, Volume= 0.013 af, Depth> 5.05" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 1 0.25 I 1 1 I I I I 0.24 0.23 1---`--+------`--+---I-- Type II}24-hrr- --- 1--- 0.22 --y11 02 10 Year Rainfall=5.56" ]---i---i 0.2 ' 019 Rwhoff A�`ea=�0..,030-ac -- 0.18 1 0.17 0.16 ' 1 1 -Runoff VglUrne=O'01a of 0.15 ... 0.14 -----------------------------r---Ii--r Runoff De 5.05" �I p-t1h > 1 0.13 -- - - - - -- - ____-----r---i---r --r 0 0.12---`--+---I---+ Length_=1Q0_--_; LL 0.11 -F1oW -----'r 0.1 0.09 I r r--1---I---r---I---r--r 0.08 + -J -L -+ _I _I 1 1 1 0.06 -+ _J _L _+ _I _L 0.041 _a______+__+___+__;___I___F__�___I___ 1 1 I 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Subcatchment 13S: Pre - Developed Tc [491 Hint: Tc<2dt may require smaller dt Runoff = 10.66 cfs @ 11.95 hrs, Volume= 0.433 af, Depth> 2.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Tc Hydrograph __ . ' - - ___ ■Runoff 11 -- ----- 1066c6 Type II 24-hr ---- 0 10 Year Rainfall=5.56" - 9 Runoff Area=2.220 ac - 8 Runoff Volume=0.433 of - Runoff Depth>2.34" - 5 Flow Length=615' - 4 Tc=4.0 min --- 3 CN=71 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Summary for Subcatchment 14S: Post - Developed Tc [491 Hint: Tc<2dt may require smaller dt [471 Hint: Peak is 227% of capacity of segment #3 Runoff = 16.40 cfs @ 11.95 hrs, Volume= 0.733 af, Depth> 3.64" Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.56" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, 4.8 830 Total Subcatchment 14S: Post - Developed Tc Hydrograph 18 17 -T 16 -TypeUi2-46 ..... --.-- .'I---1,-- ---I- 151_10I Y_!Le_a_ 1rRiff i_iaf_a 14 13 RunWAeea;2_AM_5_Lr.a_s_8Jtlu_-__ 1211 Runoff Wuine--imQ.733-af -- �---�- 10 no „ Ruff De th>3.61 Orr II I I I 3 g I I I I LL B Flow Length=830' 7 Tc=4.8 min ---_ _ 6 I I I I I I 5 C N=85i------ ------ -- -----�---I I I I I I I I I 3 I I 2------�------�---I 1 I I I I I ❑Runoff way I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 3.55" for 10 Year event Inflow = 21.33 cfs @ 11.97 hrs, Volume= 1.020 of Outflow = 10.93 cfs @ 12.07 hrs, Volume= 1.019 af, Atten= 49%, Lag= 6.2 min Primary = 10.93 cfs @ 12.07 hrs, Volume= 1.019 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 677.66' @ 12.07 hrs Surf.Area= 3,541 sf Storage= 12,798 cf Plug -Flow detention time= 24.0 min calculated for 1.019 of (100% of inflow) Center -of -Mass det. time= 23.4 min ( 781.7 - 758.4 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Primary OutFlow Max=10.85 cfs @ 12.07 hrs HW=677.62' (Free Discharge) L1=Culvert (Inlet Controls 10.85 cfs @ 8.84 fps) �2=Orifice (Passes < 2.35 cfs potential flow) 3=Grate ( Controls 0.00 cfs) 5=10 yr Orifice (Passes < 8.70 cfs potential flow) econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=671.20' (Free Discharge) =Spillway ( Controls 0.00 cfs) Pond 4P: Pond 1 Hydrograph Inflow Area=;3.450 ac 22 --- I 20 --r--*-- Storati"12,798_d 18 I I I I I I I I I I I I I I I I I I I I I I 16 I I I I I I I I I I I I I I I I I I I 14--i--i--T--T--T--T--i' 1093 10 93 01 V __ I___I__I __I__I__I__I__ _ 12 I I I I I I I 3 I I I I I I I O ' L__L__L__1__1__1__1__1_ u_ 10 I I I I I I I I I I I 8 I I I I 7 8 9 10 11 Time (hours) Printed 3/2/2023 Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 3.49" for 10 Year event Inflow = 11.24 cfs @ 12.06 hrs, Volume= 1.044 of Primary = 11.24 cfs @ 12.06 hrs, Volume= 1.044 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph ___________________I___I� - ❑Inflow n2a �N �J__ �_ ❑Primary 12 I I I I I I I ii2a ots Inflow Area-3.59 a 11- I I I I I I I I 10 I I I I I I L__J___I___L__ I I I I I I I I I I I 9 I I I I I I J___IL__1__J___L__L__J___L__1__ ._L__J__J___L__J___I___L__ I I I I I I I I I I I I I I I I I L__ I I I I I I I I I I I I I I I I I y I I I I I I I I I I I I I I I I I p6 I I I I I I I I I I I LL I I I I I I I I 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 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 10 Year Rainfall=5.56" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 2.32" for 10 Year event Inflow = 13.06 cfs @ 11.97 hrs, Volume= 0.581 of Primary = 13.06 cfs @ 11.97 hrs, Volume= 0.581 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph -- _-_� __�__;---i __�__�___�__ ■Inflow 14 --r- +s.oe as—*-------r--7---r--r-- ■Primary Inflow Area=&000-ate '-- 1 --- -- i-- I - - I I I 1z I I I I I I I T -� � II I I I I I I I r r r 8 I I I I 7 , r---r--r--r---r--r-r--r---r--r-----------r-- r--r - - -r - -r 6 -- LL I I I I I I I I I 5__*___---r--t------r--*-----r--*__ __*__-___�___*--------r-- q I I 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___�___r__•__y___r__t_ -''--------*--r------r-- 3 - --� o -I 7 8 9 10 11 Time (hours) Storm Calcs - Restore N Station Type 1124-hr 100 Year Rainfall=9.05" Prepared by Timmons Group Printed 3/2/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 37 Time span=0.00-20.00 hrs, dt=0.05 hrs, 401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post - Developed Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>6.80" Tc=6.0 min CN=85 Runoff=27.96 cfs 1.371 of Subcatchment2S: Pre - Developed Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>5.11" Tc=6.0 min CN=71 Runoff=20.73 cfs 0.946 of Subcatchment5S: Undisturbed Area 1 - Runoff Area=0.420 ac 100.00% Impervious Runoff Depth>8.37" Flow Length=100' Tc=6.0 min CN=98 Runoff=5.28 cfs 0.293 of Subcatchment6S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=5.47 cfs 0.248 of Subcatchment8S: Undisturbed Area 3 - Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=1.25 cfs 0.057 of Subcatchment9S: Undisturbed Area 3 -Pre Runoff Area=0.140 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=1.25 cfs 0.057 of Subcatchment10S: Undisturbed Area 2 - Runoff Area=0.610 ac 0.00% Impervious Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 Runoff=5.47 cfs 0.248 of Subcatchmentl 1 S: Undisturbed Areal - Runoff Area=0.030 ac 100.00% Impervious Runoff Depth>8.37" Flow Length=100' Tc=6.0 min CN=98 Runoff=0.38 cfs 0.021 of Subcatchmentl3S: Pre -Developed Tc Runoff Area=2.220 ac 5.41 % Impervious Runoff Depth>5.11" Flow Length=615' Tc=4.0 min CN=71 Runoff=22.51 cfs 0.946 of Subcatchmentl4S: Post - Developed Tc Runoff Area=2.420 ac 55.79% Impervious Runoff Depth>6.80" Flow Length=830' Tc=4.8 min CN=85 Runoff=29.34 cfs 1.372 of Pond 4P: Pond 1 Peak Elev=679.78' Storage=21,765 cf Inflow=38.70 cfs 1.912 of Primary=12.65 cfs 1.761 of Secondary=15.39 cfs 0.148 of Outflow=28.04 cfs 1.909 of Link 7L: Post Developed Point of Analysis Inflow=13.75 cfs 1.818 of Primary=13.75 cfs 1.818 of Link 12L: Pre Developed Point of Analysis Inflow=27.82 cfs 1.271 of Primary=27.82 cfs 1.271 of Total Runoff Area = 11.230 ac Runoff Volume = 5.558 of Average Runoff Depth = 5.94" 69.81% Pervious = 7.840 ac 30.19% Impervious = 3.390 ac Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 1S: Post -Developed Runoff = 27.96 cfs @ 11.96 hrs, Volume= 1.371 af, Depth> 6.80" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 1S: Post - Developed Hydrograph ———————————————————- 1___L__J--- L__1--- L——L --- ---------- L__J--- L------ 30 I ,___r___I___r___I___�__�__ 2)96 cfs 28 I -T�p�*246I I hr1___I___L__ 26 I I 11- 24 22 Run'off! Area=2.420 at 20 Runoff Volume=1.371 of 18 - I---r -- r -- 1--- V 16 Runoff Depth>6.80" r 3 _ _IL _1 _I. _L _J _L _J _L _J ° 14 LL Tc=6.0 min I I I I I I I I I I I I 12 CN=Q5I 9 10 I I I I I I I I I I I I I I I I I I I I I I 8 I 6 I I I I I I I I I I I I I I 4 I I I I I I I 2 I I I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ RunoH Storm Calcs - Restore N Station Prepared by Timmons Group Type II 24-hr 100 Year Rainfall=9.05" Summary for Subcatchment 2S: Pre - Developed Runoff = 20.73 cfs @ 11.97 hrs, Volume= 0.946 af, Depth> 5.11" Routed to Link 12L : Pre Developed Point of Analysis Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description " 2.100 69 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41% Impervious Area Tc Length Description 6.0 Direct Entry, (6 minutes minimum) Subcatchment 2S: Pre - Developed Hydrograph 23 , _ 22 I --I---I ---I---I---I i___L__i____ 20."$ __________ ------ --- --- 21 ' `I - 20 -T-;�j1E-IIT��!6`•'T---�'I---r------- - - -'r ---I---r------r-----'r--;--- '9 IN Year RainfaIN:9-057 18 ,7 p' y� pI-Ins�/I� 71� '_ ---I---r---;---r---II---ir--;--- 16 =rYun1dff rtW#2.220_aL.____1 =--- I I I I I I I I --I--- �---I--- I--, ---I---I--- 12 ' 0 11 I I I I I I I I - r -. I I I I I I I M 10 C • � limi ---I I I I I I I -- I I I 9 CN =71' - - - -; -- L- ;-I -- 8 --'-r--T---I---r--_i___r__�___�__T___i_ 6 i 5 __Y___r__y___I___t___I___r__y___r__y___I ' q I __!___L__1_______I ___ I I _______ I__________. I I I I I I 3 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 5S: Undisturbed Area 1 - Post Developed Runoff = 5.28 cfs @ 11.96 hrs, Volume= 0.293 af, Depth> 8.37" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.420 98 0.420 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, assumed Subcatchment 5S: Undisturbed Area 1 - Post Developed Hydrograph I 5 Type II 24-hr 100 Year Rainfall=9.05" 4 Runoff Area=0.420 ac i Runoff Volume=0.293 of 3 Runoff Depth>8.37"t ° Flow Length=100'I LL i 2 Tc=6.0 min ' I I I II CN=98 I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoft Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 rl— A A Summary for Subcatchment 6S: Undisturbed Area 2 - Post Developed Runoff = 5.47 cfs @ 11.97 hrs, Volume= 0.248 af, Depth> 4.87" Routed to Pond 4P : Pond 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 100 0.28 Direct Entry, assumed Subcatchment 6S: Undisturbed Area 2 - Post Developed Hydrograph 1 Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.610 ac Runoff Volume=0.248 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 8S: Undisturbed Area 3 - Post Developed Runoff = 1.25 cfs @ 11.97 hrs, Volume= 0.057 af, Depth> 4.87" Routed to Link 7L : Post Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 8S: Undisturbed Area 3 - Post Developed Hydrograph ■ Runoff Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.140 ac Runoff Volume=0.057 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 9S: Undisturbed Area 3 - Pre Developed Runoff = 1.25 cfs @ 11.97 hrs, Volume= 0.057 af, Depth> 4.87" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN 0.140 69 0.140 100.00% Pervious Area Tc Length Slope Velocity Capacity Description in\ If --A Mtf1\ /f l.o \ Info\ 6.0 100 0.28 Direct Entry, Subcatchment 9S: Undisturbed Area 3 - Pre Developed Hydrograph ■ Runoff Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.140 ac Runoff Volume=0.057 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 rl— A A Summary for Subcatchment 10S: Undisturbed Area 2 - Pre Developed Runoff = 5.47 cfs @ 11.97 hrs, Volume= 0.248 af, Depth> 4.87" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 0.610 69 0.610 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 100 0.28 Direct Entry, Subcatchment 10S: Undisturbed Area 2 - Pre Developed Hydrograph 1 Type II 24-hr 100 Year Rainfall=9.05" Runoff Area=0.610 ac Runoff Volume=0.248 of Runoff Depth>4.87" Flow Length=100' Tc=6.0 min CN=69 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Subcatchment 11S: Undisturbed Area 1 - Pre Developed Runoff = 0.38 cfs @ 11.96 hrs, Volume= 0.021 af, Depth> 8.37" Routed to Link 12L : Pre Developed Point of Analysis Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN 0.030 98 0.030 100.00% Impervious Area Tc Length iin) (feet) 6.0 100 Description 0.28 Direct Entry, Subcatchment 11S: Undisturbed Area 1 - Pre Developed Hydrograph 0.42 -r -r r -T 0.4 0.38 Type 11' 24-hlrf-- - 7 o.3s -------- 034 : 100 Year Rainfal"- 51 ---I- --t 0.32 . 1 __---'---` 0.3 Runoff Area=0.030 ac ----, 0.28 0.26 Runoff Volume=0.021 of 0.22 Runoff Depth>8.37"__== ° 02 Flow Length=100'-- ` 0.16 Tc=6.0 min 0.14 0.12 '' CN=98'---11---'I-1------=--=---I -- 0.06 I _l _I _L _J _L _1 _I _L _J _I _1 0.06 -r -- -; I 0.04 I- I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) I ❑ Runoff Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Summary for Subcatchment 13S: Pre - Developed Tc [491 Hint: Tc<2dt may require smaller dt Runoff = 22.51 cfs @ 11.94 hrs, Volume= 0.946 af, Depth> 5.11" Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05" Area (ac) CN Description * 2.100 69 * 0.120 98 2.220 71 Weighted Average 2.100 94.59% Pervious Area 0.120 5.41 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0200 0.69 Sheet Flow, n= 0.030 P2= 4.00" 1.3 300 0.0630 3.76 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.3 215 0.0740 11.93 119.32 Channel Flow, Area= 10.0 sf Perim= 12.0' r= 0.83' n= 0.030 Earth, grassed & windinq 4.0 615 Total Subcatchment 13S: Pre - Developed Tc Hydrograph 25 - I I I I I I I I I I I I I I I I -----------------r--r------------------r--r------r------r-----_ ■ RunoH 23 2251 qs 22 Type 11124-hr 21 20 ; -100 Year Rainfall:*.W', ; --L--- ---t--- ---L--J--- L--J--- 19 __I I___I___rr___I___r___I___r__-___ 19 , -RunoffAeea-Runoff ad -----;___I, ___,___;___,___; 2 17- 16 ; -Runoff Vo-Iume=0.940 of---- II ---- LI r w 14R(MuffQeJjtk>&11"�---' 13 ----11--- ---- -- ---1-- --- 3 11 0120 . __ - 1 - rr--�--- -----r--r------r--r- r-- I--- FIovV Lien fh-6T5-L___I___L__�___I. LL 11 L v __I___L__J___L___I___ L__J___ ------------------------- 9 Tc=4.0 min ______L_J _L_1 _ I ___L--- I --- L__L--- L__J--- I I I 7 �j -^N--171 ______I___L___I___L__1___I_ I I I I I I I I I I I I I I � 5. -----I------I------I---L---I---I -_ _ I I I I I I I I I I __II ______r ___I___r _____. 4 _______�___I___t___I___�__y___r__y___I ___I___ T___I___ f__y___r__y__. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Summary for Subcatchment 14S: Post - Developed Tc [491 Hint: Tc<2dt may require smaller dt [471 Hint: Peak is 406% of capacity of segment #3 Runoff = 29.34 cfs @ 11.95 hrs, Volume= 1.372 af, Depth> 6.80" Printed 3/2/2023 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=9.05 Area (ac) CN Description 1.350 98 1.070 69 2.420 85 Weighted Average 1.070 44.21 % Pervious Area 1.350 55.79% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.4 100 0.0050 0.69 Sheet Flow, n= 0.015 P2= 4.00" 1.2 100 0.0050 1.44 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.2 630 0.0380 9.03 7.23 Channel Flow, 4.8 830 Total Subcatchment 14S: Post - Developed Tc Hydrograph 32-11 3 E2 -Typ tl 241 hr; ---I -- 26 ` I 26 lQO_�fe'ar Rainfall _ 9�dv 24 ' -R nl'dffTAr'eat:-2.�2®-at--- 22 2 _Run lofFVolurne=�.37� af__ --- 18 Rnnlo*Depth>�86"-;-- - i6 ' 14 12 F1OvVtn�th�830'L-- -- - _Tc=-8! ml� I I I I I I I 6 I I 6 _ __ _ _____ I I _Y _r _7 _r ' I I I I I I I 4 2 I I 6 7 6 9 10 11 Time (hours) 12 13 14 15 16 17 16 19 20 Storm Caics - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Summary for Pond 4P: Pond 1 Printed 3/2/2023 Inflow Area = 3.450 ac, 51.30% Impervious, Inflow Depth > 6.65" for 100 Year event Inflow = 38.70 cfs @ 11.96 hrs, Volume= 1.912 of Outflow = 28.04 cfs @ 12.04 hrs, Volume= 1.909 af, Atten= 28%, Lag= 4.7 min Primary = 12.65 cfs @ 12.04 hrs, Volume= 1.761 of Routed to Link 7L : Post Developed Point of Analysis Secondary = 15.39 cfs @ 12.04 hrs, Volume= 0.148 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 679.78' @ 12.04 hrs Surf.Area= 5,013 sf Storage= 21,765 cf Plug -Flow detention time= 23.7 min calculated for 1.909 of (100% of inflow) Center -of -Mass det. time= 23.0 min ( 769.2 - 746.2 ) Volume Invert Avail.Storage Storage Description #1 671.20' 28,478 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 671.20 1 0 0 672.00 1,125 450 450 673.00 1,400 1,263 1,713 674.00 1,785 1,593 3,305 675.00 2,185 1,985 5,290 676.00 2,613 2,399 7,689 677.00 3,156 2,885 10,574 678.00 3,736 3,446 14,020 679.00 4,422 4,079 18,099 680.00 5,183 4,803 22,901 681.00 5,970 5,577 28,478 Device Routing Invert Outlet Devices #1 Primary 671.00' 15.0" Round Culvert L= 100.0' Ke= 1.000 Inlet / Outlet Invert= 671.00' / 670.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 671.20' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 677.70' 24.0" x 24.0" Horiz. Grate C= 0.600 #4 Secondary 679.00' Spillway, Cv= 2.62 (C= 3.28) Elev. (feet) 679.00 680.00 Width (feet) 5.00 11.00 #5 Device 1 675.50' 20.0" W x 10.0" H Vert. 10 yr Orifice C= 0.600 Limited to weir flow at low heads Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Primary OutFlow Max=12.63 cfs @ 12.04 hrs HW=679.75' (Free Discharge) L1=Culvert (Inlet Controls 12.63 cfs @ 10.29 fps) 2=Orifice (Passes < 2.72 cfs potential flow) 3=Grate (Passes < 27.58 cfs potential flow) 5=10 yr Orifice (Passes < 13.09 cfs potential flow) econdary OutFlow Max=14.56 cfs @ 12.04 hrs HW=679.75' (Free Discharge) =Spillway (Weir Controls 14.56 cfs @ 2.66 fps) Pond 4P: Pond 1 Hydrograph -inflow Arir_ea_=3_.450-aC--- 42 41 38 36 34 a3forr je-4`CrZg5 of -- se.oa ors 32 30 28 I I I 26 L^ 24L--L--L --L--L--L--L--i--J--J-- .V.. 22 020 ' / 14 __L__L__L__1__1__1__1__1__J_ 12 10-L--L--L- 8 / 7 8 9 10 11 Time (hours) Printed 3/2/2023 __ --------------- ■Inflow ■ Primary ■Secondary I ------------ I I I I I I I I__ I__ I___I___I___I___ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Link 7L: Post Developed Point of Analysis Inflow Area = 3.590 ac, 49.30% Impervious, Inflow Depth > 6.08" for 100 Year event Inflow = 13.75 cfs @ 12.01 hrs, Volume= 1.818 of Primary = 13.75 cfs @ 12.01 hrs, Volume= 1.818 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 7L: Post Developed Point of Analysis Hydrograph --r---r--r--�-- - I I I I ' ' ' ' ' ' ' ' ' ❑ Inflow -J---L--L-- 15 ---_____------`--------`--❑Primar y Inflow Area=3.890-ate 13. ch 14 I I I I 13 I i I I I I 12 I I I I i i i I I I i i I I I I 1a I I I I I I I I I I I 8 I I I I I I I I I I I p 7 __ __ ___ __ ___i___i___ i___I___ I I__II—II II I II i i i I LL I I I I i i i I I I i i i I I 6 I I I I I I I I I I I 5 I I I I I I I I I I I a __7__-I___'7 __7___r___r__r_ _______r__r___I___r__ L__1__J___L__L__J___L__L_-__J___I___L- 3 2 Time (hours) Storm Calcs - Restore N Station Prepared by Timmons Group Type 1124-hr 100 Year Rainfall=9.05" Printed 3/2/2023 Summary for Link 12L: Pre Developed Point of Analysis Inflow Area = 3.000 ac, 5.00% Impervious, Inflow Depth > 5.08" for 100 Year event Inflow = 27.82 cfs @ 11.97 hrs, Volume= 1.271 of Primary = 27.82 cfs @ 11.97 hrs, Volume= 1.271 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Link 12L: Pre Developed Point of Analysis Hydrograph I nflowr Area=3.006- ac - E 28 --1--L---'---1--J---L--L--J---L--L- 26 I I I I I I I I I I I I I I I I I I I I 24 __T___I___T--T---r--r--r--T---r--r- I I I 22 I I I I I I I I I 20 I I I I I I I I I I I I I I '-' 16 I I I I I I I I c I I I I _T 14 T T LL I I I I I 12 I I I I I I I I I 10 - __ I_________ ___I___I___I __ I___I___ _ I I I I I I I I I I I I I I I I I B I _1 _I _I _1 _J _L _L g I I I I I I I I I I 4 -I T 2 6 0 1 2 3 4 5 6 7 8 9 10 11 Time (hours) FE ]—I n—fl.—. ---I-I ❑ Primary -II IF I I I I I I I I I I I I I I I I I I I I I I I I I __I__ I__ I___I __ I_________ I I _T _T I _1 I