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WPO201500038 Calculations 2016-02-05
DUNLORA V COUNTY OF ALBEMARLE, VIRGINIA WPO PLAN DESIGN CALCULATIONS & NARRATIVE JUNE 229 2015 REVISED SEPTEMBER 9, 2015 REVISED NOVEMBER 11, 2015 REVISED DECEMBER 17, 2015 REVISED FEBRUARY 5, 2016 TIMMONS GROUP YOUR VISION ACHIEVED "THROUGH OURS Prepared by: Craig Kotarski, PE Timmons Group 111 W. High Street Charlottesville, VA 22902 434.962.4337 CRAJG V4 J. KG FARSKI � Lic. No. 040204807 1511 G ,ty NAL � Table of Contents Section Title Project Narrative 2 LD 229 — Storm Sewer Design Computations 3 LD 204 — Storm Inlet Design Computations 4 LD 347 — Hydraulic Grade Line Computations 5 Virginia Runoff Reduction Method Worksheet Summary 6 Pre -Developed HyrdoCAD Calculations 7 Post -Developed HydroCAD Calculations Project Narrative: This project is a residential development that includes the addition of 20 single family lots with associated roads, sidewalks, and utilities. Limits of clearing and grading is 4.17 acres. Water Quality: In the proposed condition there will be 2.62 acres of managed turf, 1.80 acres of impervious cover, and 0.53 acres of forest. Per the Virginia Runoff Reduction Spreadsheet, this will require that 3. 10 lbs. of phosphorus be removed per year. Phosphorous credits will be purchased. Water Quantity The site consists of two drainage areas. Drainage area 1 drains to the North where it ultimately outfalls into the Dunlora pond. An underground pipe storage system is being provided to reduce flow back to pre -developed rates. From the storage pipes, the storm sewer system connects to an existing drop inlet on Shepherds Ridge Road. The existing pond drains to Town Branch, eventually making its way eastward to the Rivanna River. Drainage area 2 drains to the south. An underground pipe storage system is being provided to reduce flow back to pre -developed rates. From the storage pipe, the storm sewer system connects an existing drop inlet located within the Rio Road right-of-way. This structure drains across the road through CATEC, eventually discharging into Meadow Creek. N Z O H Q F a f O U 0 O U) U W w w d U) w LL N O O J y y 3 W 02 y � � - - - a N o .-.. W IL rn e n h T N V� n V a G v v o n w v 1i 14 oQO 3 O C O O p VJ d G O G a C G O C O C O O a v. o � _ �. O O O O O O O O O O O O O O - O c a o d r d d d d d N 616 N d d r d m d O d O d n w - ,� U c r4Q ------ - - - z `a 'm `d .aT > > > > 7 > > > > 7 N U U U U U U U U U U U U U U U U U U U U U w fa �3 a g r o N o o o o v°Oi r ti C G G O O O G O C O G C G C 0� z 6- O a_ d • a _ a o - i� a 30 z � d d Q > W a ZOmo = e o 7a r r a ai a d V d' V a U •-' � O V b N N O M O r O vj N V N Q ry Q -6 h q O N F N w O o O 0 O 0 O O 0 O 0 O 0 O 0 O O O 0 O 0 O 0 0 O 0 O 0 O 0 O d O d O d . V vQi 6 6 �p c Z O d a �a. 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Pond routing by Stor-Ind method Subcatchment 1S: PreDev #1 Runoff Area=1.610 ac 7.45% Impervious Runoff Depth>1.23" Flow Length=201' Tc=13.2 min CN=72 Runoff=2.67 cfs 0.166 of Subcatchment 2S: PreDev #2 Runoff Area=3.330 ac 4.80% Impervious Runoff Depth>1.23" Flow Length=351' Tc=19.7 min CN=72 Runoff=4.43 cfs 0.342 of Total Runoff Area = 4.940 ac Runoff Volume = 0.508 of Average Runoff Depth =1.23" 94.33% Pervious = 4.660 ac 5.67% Impervious = 0.280 ac Pre Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Pace 5 Summary for Subcatchment 1 S: PreDev #1 Runoff = 2.67 cfs @ 12.06 hrs, Volume= 0.166 af, Depth> 1.23" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 2 -Year Rainfall=3.68" Area (ac) CN Description 0.120 98 Paved parking, HSG C 1.380 70 Woods, Good, HSG C 0.110 74 >75% Grass cover, Good, HSG C 1.610 72 Weighted Average 1.490 92.55% Pervious Area 0.120 0.7 7.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 100 0.0650 _ 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 0.7 101 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 13.2 201 Total Subcatchment 1S: PreDev #1 Hydrograph 2.67 cfs Type II 24 -hr 2 -Year Rainfall=3.68" Runoff Area=1.610 ac 2 Runoff Volume=0.166 of Runoff Depth>1.23" 3 Flow Length=201' ° Tc=13.2 min u. 1 CN=72 �, moi//}%/I//!/f/////J/J//J//!/:•: - r -i�rfiffiirr. ifr 6 8 10 12 14 16 18 20 22 24 ■ Runoff Pre Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCA❑ Software Solutions LLC Page 6 Hydrograph for Subcatchment 1S: PreDev 01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.03 0.00 0.00 1.20 0.05 0.00 0.00 1.60 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.40 0.10 0.00 0.00 2.80 0.12 0.00 0.00 3.20 0.14 0.00 0.00 3.60 0.16 0.00 0.00 4.00 0.18 0.00 0.00 4.40 0.20 0.00 0.00 4.80 0.22 0.00 0.00 5.20 0.24 0.00 0.00 5.60 0.27 0.00 0.00 6.00 0.29 0.00 0.00 6.40 0.32 0.00 0.00 6.80 0.35 0.00 0.00 7.20 0.38 0.00 0.00 7.60 0.41 0.00 0.00 8.00 0.44 0.00 0.00 8.40 0.48 0.00 0.00 8.80 0.52 0.00 0.00 9.20 0.56 0.00 0.00 9.60 0.61 0.00 0.00 10.00 0.67 0.00 0.00 10.40 0.73 0.00 0.00 10.80 0.81 0.00 0.00 11.20 0.92 0.01 0.02 11.60 1.13 0.03 0.07 12.00 2.44 0.50 2.25 12.40 2.67 0.62 0.58 12.80 2.79 0.69 0.28 13.20 2.88 0.74 0.21 13.60 2.96 0.78 0.17 14.00 3.02 0.82 0.15 14.40 3.07 0.85 0.13 14.80 3.12 0.88 0.12 15.20 3.16 0.91 0.11 15.60 3.20 0.93 0.10 16.00 3.24 0.95 0.09 16.40 3.27 0.97 0.08 16.80 3.30 0.99 0.08 17.20 3.33 1.01 0.08 17.60 3.36 1.03 0.07 18.00 3.39 1.05 0.07 18.40 3.42 1.07 0.07 18.80 3.44 1.08 0.06 19.20 3.46 1.10 0.06 19.60 3.48 1.11 0.06 20.00 3.50 1.12 0.05 20.40 3.52 1.14 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 3.54 1.15 0.05 21.20 3.56 1.16 0.05 21.60 3.58 1.17 0.05 22.00 3.60 1.18 0.05 22.40 3.61 1.20 0.05 22.80 3.63 1.21 0.05 23.20 3.65 1.22 0.05 23.60 3.66 1.23 0.05 24.00 3.68 1.24 0.04 Pre Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Pana 7 Summary for Subcatchment 2S: PreDev #2 Runoff = 4.43 cfs @ 12.14 hrs, Volume= 0.342 af, Depth> 1.23" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 2 -Year Rainfall=3.68" Area (ac) CN Description 0.160 98 Impervious 0.260 74 Pasture/grassland/range, Good, HSG C 2.910 70 Woods, Good, HSG C 3.330 72 Weighted Average 3.170 95.20% Pervious Area 0.160 4.80% Impervious Area Tc Length Slope Velocity Capacity Description min feet ft/ft (ft/sec) (cfs) 15.6 100 0.0375 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 4.1 251 0.0420 1.02 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 19.7 351 Total Subcatchment 2S: PreDev #2 Hydrograph 4.43_cfs 1 Type II 24 -hr 2 -Year 4 Rainfall=3.68" Runoff Area=3.330 ac N 3 Runoff Volume=0.342 of Runoff Depth>1.23" 3 Flow Length=351' 2 Tc=19.7 min CN=72 1 1 rrr ..•r 0 2 4 6 8 10 12 14 16 18 20 22 24 Runoff Pre Type 11 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 @2010 H droCAD Software Solutions LLC Paae 8 Hydrograph for Subcatchment 2S: PreDev 92 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.03 0.00 0.00 1.20 0.05 0.00 0.00 1.60 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.40 0.10 0.00 0.00 2.80 0.12 0.00 0.00 3.20 0.14 0.00 0.00 3.60 0.16 0.00 0.00 4.00 0.18 0.00 0.00 4.40 0.20 0.00 0.00 4.80 0.22 0.00 0.00 5.20 0.24 0.00 0.00 5.60 0.27 0.00 0.00 6.00 0.29 0.00 0.00 6.40 0.32 0.00 0.00 6.80 0.35 0.00 0.00 7.20 0.38 0.00 0.00 7.60 0.41 0.00 0.00 8.00 0.44 0.00 0.00 8.40 0.48 0.00 0.00 8.80 0.52 0.00 0.00 9.20 0.56 0.00 0.00 9.60 0.61 0.00 0.00 10.00 0.67 0.00 0.00 10.40 0.73 0.00 0.00 10.80 0.81 0.00 0.00 11.20 0.92 0.01 0.03 11.60 1.13 0.03 0.12 12.00 2.44 0.50 2.65 12.40 2.67 0.62 1.83 12.80 2.79 0.69 0.70 13.20 2.88 0.74 0.47 13.60 2.96 0.78 0.38 14.00 3.02 0.82 0.32 14.40 3.07 0.85 0.27 14.80 3.12 0.88 0.25 15.20 3.16 0.91 0.23 15.60 3.20 0.93 0.21 16.00 3.24 0.95 0.19 16.40 3.27 0.97 0.18 16.80 3.30 0.99 0.17 17.20 3.33 1.01 0.16 17.60 3.36 1.03 0.16 18.00 3.39 1.05 0.15 18.40 3.42 1.07 0.14 18.80 3.44 1.08 0.13 19.20 3.46 1.10 0.13 19.60 3.48 1.11 0.12 20.00 3.50 1.12 0.11 20.40 3.52 1.14 0.11 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 3.54 1.15 0.10 21.20 3.56 1.16 0.10 21.60 3.58 1.17 0.10 22.00 3.60 1.18 0.10 22.40 3.61 1.20 0.10 22.80 3.63 1.21 0.10 23.20 3.65 1.22 0.10 23.60 3.66 1.23 0.09 24.00 3.68 1.24 0.09 Pre Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCADO 9.10 s/n 06538 @2010 H droCAD Software Solutions LLC Page 9 Time span=0.00-24.00 hrs, dt=0.02 hrs, 1201 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: PreDev #1 Runoff Area=1.610 ac 7.45% Impervious Runoff Depth>2.63" Flow Length=201' Tc=13.2 min CN=72 Runoff=5.84 cfs 0.353 of Subcatchment 2S: PreDev 02 Runoff Area=3.330 ac 4.80% Impervious Runoff Depth>2.62" Flow Length=351' Tc=19.7 min CN=72 Runoff=9.80 cfs 0.728 of Total Runoff Area = 4.940 ac Runoff Volume =1.080 of Average Runoff Depth = 2.62" 94.33% Pervious = 4.660 ac 5.67% Impervious = 0.280 ac Pre Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCADD 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 10 Summary for Subcatchment 1 S: PreDev #1 Runoff = 5.84 cfs @ 12.05 hrs, Volume= 0.353 af, Depth> 2.63" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area (ac) CN Description 0.120 98 Paved parking, HSG C 1.380 70 Woods, Good, HSG C 0.110 74 >75% Grass cover. Good, HSG C 1.610 72 Weighted Average 1.490 92.55% Pervious Area 0.120 Woods: Light underbrush n= 0.400 P2= 3.68" 7.45% Impervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) 12.5 100 0.0650 _(cfs) 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 0.7 101 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 13.2 201 Total Subcatchment IS: PreDev #1 Hydrograph 5.84 cfs 6 Type II 24 -hr 10 -Year 5 Rainfall=5.56" Runoff Area=1.610 ac N 4 Runoff Volume=0.353 of Runoff Depth>2.63" c 3 Flow Length=201' Tc=13.2 min 2 CN=72 1 0 0 2 4 6 8 10 12 14 Time (hours) 16 18 20 22 24 ■ Runoff Pre Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADa 9.10 s/n 06538 Q 2010 M droCAD Software Solutions LLC Page 11 Hydrograph for Subcatchment 1S: PreDev #1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.05 0.00 0.00 1.20 0.07 0.00 0.00 1.60 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.40 0.15 0.00 0.00 2.80 0.18 0.00 0.00 3.20 0.21 0.00 0.00 3.60 0.24 0.00 0.00 4.00 0.27 0.00 0.00 4.40 0.30 0.00 0.00 4.80 0.33 0.00 0.00 5.20 0.37 0.00 0.00 5.60 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.40 0.49 0.00 0.00 6.80 0.53 0.00 0.00 7.20 0.57 0.00 0.00 7.60 0.62 0.00 0.00 8.00 0.67 0.00 0.00 8.40 0.72 0.00 0.00 8.80 0.78 0.00 0.00 9.20 0.85 0.00 0.01 9.60 0.92 0.01 0.02 10.00 1.01 0.01 0.03 10.40 1.11 0.03 0.05 10.80 1.23 0.05 0.09 11.20 1.40 0.09 0.15 11.60 1.71 0.18 0.31 12.00 3.69 1.24 5.13 12.40 4.03 1.48 1.15 12.80 4.22 1.62 0.54 13.20 4.36 1.72 0.41 13.60 4.47 1.80 0.33 14.00 4.56 1.86 0.27 14.40 4.64 1.92 0.24 14.80 4.71 1.98 0.22 15.20 4.78 2.03 0.20 15.60 4.84 2.07 0.19 16.00 4.89 2.12 0.17 16.40 4.94 2.15 0.16 16.80 4.99 2.19 0.15 17.20 5.04 2.23 0.14 17.60 5.08 2.26 0.14 18.00 5.12 2.29 0.13 18.40 5.16 2.32 0.12 18.80 5.20 2.35 0.12 19.20 5.23 2.38 0.11 19.60 5.26 2.40 0.10 20.00 5.29 2.43 0.10 20.40 5.32 2.45 0.09 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 5.35 2.47 0.09 21.20 5.38 2.49 0.09 21.60 5.41 2.51 0.09 22.00 5.43 2.54 0.09 22.40 5.46 2.56 0.09 22.80 5.48 2.58 0.08 23.20 5.51 2.60 0.08 23.60 5.54 2.62 0.08 24.00 5.56 2.64 0.08 Pre Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCADO 9.10 s/n 06538 @2010 HvdroCAD Software Solutions LLC Page 12 Summary for Subcatchment 2S: PreDev #2 Runoff = 9.80 cfs @ 12.13 hrs, Volume= 0.728 af, Depth> 2.62" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area (ac) CN Description 0.160 98 Impervious 0.260 74 Pasture/grassland/range, Good, HSG C 2.910 70 Woods. Good. HSG C 3.330 72 Weighted Average 3.170 95.20% Pervious Area 0.160 4.1 251 4.80% Impervious Area Tc Length Slope Velocity Capacity Description —(min)_ (feet) (ft/ft) (ft/sec) (cfs) 15.6 100 0.0375 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 4.1 251 0.0420 1.02 Shallow Concentrated Flow, Woodland Kv= 5.0 fqs 19.7 10 9 8 .. 7 H 6 _0 5 u. 4 3 2 1 0 0 351 Total Subcatchment 2S: PreDev #2 Hydrograph 9.80 cfs Type II 24 -hr 10 -Year Rainfall=5.56" Runoff Area=3.330 ac Runoff Volume=0.728 of Runoff Depth>2.62" Flow Length=351' Tc=19.7 min CN=72 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Runoff Pre Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Pae 13 Hydrograph for Subcatchment 2S: PreDev #2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.05 0.00 0.00 1.20 0.07 0.00 0.00 1.60 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.40 0.15 0.00 0.00 2.80 0.18 0.00 0.00 3.20 0.21 0.00 0.00 3.60 0.24 0.00 0.00 4.00 0.27 0.00 0.00 4.40 0.30 0.00 0.00 4.80 0.33 0.00 0.00 5.20 0.37 0.00 0.00 5.60 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.40 0.49 0.00 0.00 6.80 0.53 0.00 0.00 7.20 0.57 0.00 0.00 7.60 0.62 0.00 0.00 8.00 0.67 0.00 0.00 8.40 0.72 0.00 0.00 8.80 0.78 0.00 0.00 9.20 0.85 0.00 0.01 9.60 0.92 0.01 0.03 10.00 1.01 0.01 0.05 10.40 1.11 0.03 0.09 10.80 1.23 0.05 0.16 11.20 1.40 0.09 0.27 11.60 1.71 0.18 0.53 12.00 3.69 1.24 6.48 12.40 4.03 1.48 3.79 12.80 4.22 1.62 1.36 13.20 4.36 1.72 0.90 13.60 4.47 1.80 0.72 14.00 4.56 1.86 0.59 14.40 4.64 1.92 0.51 14.80 4.71 1.98 0.47 15.20 4.78 2.03 0.43 15.60 4.84 2.07 0.40 16.00 4.89 2.12 0.36 16.40 4.94 2.15 0.33 16.80 4.99 2.19 0.31 17.20 5.04 2.23 0.30 17.60 5.08 2.26 0.28 18.00 5.12 2.29 0.27 18.40 5.16 2.32 0.26 18.80 5.20 2.35 0.24 19.20 5.23 2.38 0.23 19.60 5.26 2.40 0.22 20.00 5.29 2.43 0.20 20.40 5.32 2.45 0.19 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 5.35 2.47 0.19 21.20 5.38 2.49 0.18 21.60 5.41 2.51 0.18 22.00 5.43 2.54 0.18 22.40 5.46 2.56 0.18 22.80 5.48 2.58 0.17 23.20 5.51 2.60 0.17 23.60 5.54 2.62 0.17 24.00 5.56 2.64 0.17 4S Z L2\P PostDev #1 to Storage Storage system #1 System #1 �5L 1 a 3S Outfall PostDev #1 Unrouted OSubcat Reach on ''Link Post Area #1 Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.220 70 Woods, Good, HSG C (3S) 0.980 74 >75% Grass cover, Good, HSG C (3S, 4S) 0.530 98 Paved parking, HSG C (3S, 4S) 1.730 TOTAL AREA Post Area #1 Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD(b 9.10 s/n 05538 © 2010 H droCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 1.730 HSG C 3S, 4S 0.000 HSG D 0.000 Other 1.730 TOTAL AREA Post Area #1 Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD@) 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 4 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 213 451.50 450.70 30.3 0.0264 0.013 15.0 0.0 0.0 Post Area #1 Type l/ 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 C7 2010 H droCAD Software Solutions LLC Page 5 Time span=0.00-24.00 hrs, dt=0.02 hrs, 1201 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S: PostDev #1 Unrouted Runoff Area=1.040 ac 21.15% Impervious Runoff Depth>1.63" Flow Length=200' Tc=13.4 min CN=78 Runoff=2.31 cfs 0.141 of Subcatchment 4S: PostDev #1 to Storage Runoff Area=0.690 ac 44.93% Impervious Runoff Depth>2.17" Flow Length=200' Tc=9.4 min CN=85 Runoff=2.34 cfs 0.125 of Pond 213: Storage System #1 Peak Elev=456.02' Storage=0.042 of Inflow=2.34 cfs 0.125 of Outflow=0.63 cfs 0.125 of Link 5L: Outfall Inflow=2.67 cfs 0.266 of Primary=2.67 cfs 0.266 of Total Runoff Area =1.730 ac Runoff Volume = 0.266 of Average Runoff Depth =1.84" 69.36% Pervious =1.200 ac 30.64% Impervious = 0.530 ac Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 Hyo roCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Paoe 6 Summary for Subcatchment 3S: PostDev #1 Unrouted Runoff = 2.31 cfs @ 12.06 hrs, Volume= 0.141 af, Depth> 1.63" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type 11 24 -hr 2 -Year Rainfall=3.68" Area (ac) CN Description 0.220 98 Paved parking, HSG C 0.600 74 >75% Grass cover, Good, HSG C 0.220 70 Woods. Good, HSG C 1.040 78 Weighted Average 0.820 0.13 78.85% Pervious Area 0.220 21.15% Impervious Area Tc Length Slope Velocity Capacity Description _(min) (feet) _ (ft/ft) (ft/sec) cfs) 12.5 100 0.0650 0.13 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 0.9 100 0.1300 1.80 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 13.4 200 Total Subcatchment 3S: PostDev #1 Unrouted Hydrograph 2.31 ds Type II 24 -hr 2 -Year 2 Rainfall=3.68" Runoff Area=1.040 ac Runoff Volume=0.141 of Runoff Depth>1.63" 3 Flow Length=200' 1 Tc=13.4 min CN=78 1 F/!/J!f!!!!/!!J/ff!/J�I/�//ir!/!!!!J�/J/rte' - -_ -+••�•»�rr�irirr�rri�riri 0 2 4 6 8 10 12 14 16 18 20 22 24 Runoff Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 N droCADQ 9.10 s/n 06538 (D 2010 HAFOCAD Software Solutions LLC _ Page 7 Hydrograph for Subcatchment 3S: PostDev #1 Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.03 0.00 0.00 1.20 0.05 0.00 0.00 1.60 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.40 0.10 0.00 0.00 2.80 0.12 0.00 0.00 3.20 0.14 0.00 0.00 3.60 0.16 0.00 0.00 4.00 0.18 0.00 0.00 4.40 0.20 0.00 0.00 4.80 0.22 0.00 0.00 5.20 0.24 0.00 0.00 5.60 0.27 0.00 0.00 6.00 0.29 0.00 0.00 6.40 0.32 0.00 0.00 6.80 0.35 0.00 0.00 7.20 0.38 0.00 0.00 7.60 0.41 0.00 0.00 8.00 0.44 0.00 0.00 8.40 0.48 0.00 0.00 8.80 0.52 0.00 0.00 9.20 0.56 0.00 0.00 9.60 0.61 0.00 0.00 10.00 0.67 0.00 0.01 10.40 0.73 0.01 0.02 10.80 0.81 0.02 0.03 11.20 0.92 0.04 0.05 11.60 1.13 0.09 0.11 12.00 2.44 0.75 2.01 12.40 2.67 0.90 0.48 12.80 2.79 0.98 0.22 13.20 2.88 1.05 0.17 13.60 2.96 1.10 0.14 14.00 3.02 1.14 0.11 14.40 3.07 1.18 0.10 14.80 3.12 1.21 0.09 15.20 3.16 1.25 0.08 15.60 3.20 1.28 0.08 16.00 3.24 1.30 0.07 16.40 3.27 1.33 0.06 16.80 3.30 1.35 0.06 17.20 3.33 1.37 0.06 17.60 3.36 1.39 0.06 18.00 3.39 1.41 0.05 18.40 3.42 1.43 0.05 18.80 3.44 1.45 0.05 19.20 3.46 1.47 0.05 19.60 3.48 1.48 0.04 20.00 3.50 1.50 0.04 20.40 3.52 1.51 0.04 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 3.54 1.53 0.04 21.20 3.56 1.54 0.04 21.60 3.58 1.56 0.04 22.00 3.60 1.57 0.04 22.40 3.61 1.58 0.04 22.80 3.63 1.60 0.03 23.20 3.65 1.61 0.03 23.60 3.66 1.62 0.03 24.00 3.68 1.64 0.03 Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 n 2010 H droCAD Software Solutions LLC Page 8 Summary for Subcatchment 4S: PostDev #1 to Storage System #1 Runoff = 2.34 cfs @ 12.01 hrs, Volume= 0.125 af, Depth> 2.17" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 2 -Year Rainfall=3.68" Area (ac) CN Description 0.310 98 Paved parking, HSG C 0.380 74 >75% Grass cover. Good, HSG C 0.690 85 Weighted Average 0.380 55.07% Pervious Area 0.310 44.93% Impervious Area Tc Length Slope Velocity Capacity Description min feet (ft/ft) (ft/sec) cfs) 9.1 100 0.0200 0.18 _ Sheet Flow, Grass: Short n=0.150 P2=3.68" 0.3 100 0.0750 5.56 Shallow Concentrated Flow, Paved Kv= 20.3 fps 9.4 2 w 3 0 U- 1 200 Total Subcatchment 4S: PostDev #1 to Storage System #1 Hydrograph 2.34 c_f_s_ Type II 24 -hr 2 -Year Rainfall=3.68" Runoff Area=0.690 ac Runoff Volume=0.125 of Runoff Depth>2.17" Flow Length=200' Tc=9.4 min CN=85 ' "V 6 8 10 12 14 16 18 20 22 24 Runoff Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 sln 06538 © 2010 H droCAD Software Solutions LLC Page 9 Hydrograph for Subcatchment 4S: PostDev #1 to Storage System #1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.03 0.00 0.00 1.20 0.05 0.00 0.00 1.60 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.40 0.10 0.00 0.00 2.80 0.12 0.00 0.00 3.20 0.14 0.00 0.00 3.60 0.16 0.00 0.00 4.00 0.18 0.00 0.00 4.40 0.20 0.00 0.00 4.80 0.22 0.00 0.00 5.20 0.24 0.00 0.00 5.60 0.27 0.00 0.00 6.00 0.29 0.00 0.00 6.40 0.32 0.00 0.00 6.80 0.35 0.00 0.00 7.20 0.38 0.00 0.00 7.60 0.41 0.00 0.00 8.00 0.44 0.00 0.00 8.40 0.48 0.01 0.01 8.80 0.52 0.01 0.01 9.20 0.56 0.02 0.02 9.60 0.61 0.03 0.02 10.00 0.67 0.05 0.03 10.40 0.73 0.07 0.04 10.80 0.81 0.10 0.05 11.20 0.92 0.14 0.08 11.60 1.13 0.24 0.16 12.00 2.44 1.13 2.33 12.40 2.67 1.31 0.30 12.80 2.79 1.42 0.17 13.20 2.88 1.49 0.13 13.60 2.96 1.55 0.10 14.00 3.02 1.60 0.09 14.40 3.07 1.65 0.08 14.80 3.12 1.69 0.07 15.20 3.16 1.73 0.06 15.60 3.20 1.76 0.06 16.00 3.24 1.79 0.05 16.40 3.27 1.82 0.05 16.80 3.30 1.85 0.05 17.20 3.33 1.87 0.04 17.60 3.36 1.90 0.04 18.00 3.39 1.92 0.04 18.40 3.42 1.94 0.04 18.80 3.44 1.96 0.04 19.20 3.46 1.98 0.03 19.60 3.48 2.00 0.03 20.00 3.50 2.02 0.03 20.40 3.52 2.04 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 3.54 2.05 0.03 21.20 3.56 2.07 0.03 21.60 3.58 2.08 0.03 22.00 3.60 2.10 0.03 22.40 3.61 2.12 0.03 22.80 3.63 2.13 0.03 23.20 3.65 2.14 0.03 23.60 3.66 2.16 0.03 24.00 3.68 2.17 0.02 Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9,10 s/n 06538 ©2010 H droCAQ Software Solutions LLC Page 10 Summary for Pond 2P: Storage System #1 Inflow Area = 0.690 ac, 44.93% Impervious, Inflow Depth > 2.17" for 2 -Year event Inflow = 2.34 cfs @ 12.01 hrs, Volume= 0.125 of Outflow = 0.63 cfs @ 12.19 hrs, Volume= 0.125 af, Atten= 73%, Lag= 11.1 min Primary = 0.63 cfs @ 12.19 hrs, Volume= 0.125 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Peak Elev= 456.02' @ 12.19 hrs Surf.Area= 0.012 ac Storage= 0.042 of Plug -Flow detention time= 38.6 min calculated for 0.125 of (100% of inflow) Center -of -Mass det. time= 38.4 min ( 857.0 - 818.7 ) Volume Invert Avail.Stora. a storage Description #1 451.50' 0.076 of 96.0" D x 66.0'L Pipe Storage S= 0.0050T Device Routing Invert Outlet Devices #1 Primary 451.50' 15.0" Round Culvert L= 30.3' Ke= 0.500 Inlet / Outlet Invert= 451.50'/ 450.70' S= 0.0264'/' Cc= 0.900 n= 0.013 #2 Device 1 451.50' 2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 455.46' 4.2" Vert. Orifice/Grate C= 0.600 #4 Device 1 458.90' 4.2' long Sharp -Crested Rectangular Weir 2 End Contractions) Primary OutFlow Max=0.63 cfs @ 12.19 hrs HW=456.02' (Free Discharge) Ll =Culvert (Passes 0.63 cfs of 11.66 cfs potential flow) U4=Sharp-Crested Orifice/Grate (Orifice Controls 0.34 cfs @ 10.12 fps) Orifice/Grate (Orifice Controls 0.29 cfs @ 2.99 fps) Rectangular Weir ( Controls 0.00 cfs) Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Paae 11 Pond 2P: Storage System #1 Hydrograph 2 v 3 0 FL 1 W �Mel 458 a 457 c 456 0 as 455 u' 454 453 452 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Pond 2P: Storage System #1 Stage -Discharge 0 2 4 6 8 10 12 Discharge (cfs) ■ Inflow ■ Primary ■ Primary Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Pape 12 459 • 457 c 456 0 455 w 454 453 452 Pond 2P: Storage System #1 Stage -Area -Storage 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 Storage (acre-feet) ■ Storage Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 @2010 HvdroCAD Software Solutions LLC Paae 13 Hydrograph for Pond 2P: Storage System #1 Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 451.50 0.00 1.00 0.00 0.000 451.50 0.00 2.00 0.00 0.000 451.50 0.00 3.00 0.00 0.000 451.50 0.00 4.00 0.00 0.000 451.50 0.00 5.00 0.00 0.000 451.50 0.00 6.00 0.00 0.000 451.50 0.00 7.00 0.00 0.000 451.50 0.00 8.00 0.00 0.000 451.53 0.00 9.00 0.01 0.000 451.58 0.01 10.00 0.03 0.000 451.62 0.02 11.00 0.06 0.000 451.74 0.06 12.00 2.33 0.026 454.63 0.29 13.00 0.14 0.032 455.14 0.31 14.00 0.09 0.018 453.92 0.25 15.00 0.07 0.006 452.75 0.18 16.00 0.05 0.000 451.83 0.08 17.00 0.05 0.000 451.69 0.05 18.00 0.04 0.000 451.67 0.04 19.00 0.04 0.000 451.65 0.04 20.00 0.03 0.000 451.63 0.03 21.00 0.03 0.000 451.63 0.03 22.00 0.03 0.000 451.63 0.03 23.00 0.03 0.000 451.62 0.03 24.00 0.02 0.000 451.62 0.02 Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 14 Elevation Primary (feet) _ (ds) 451.50 0.00 451.60 0.02 451.70 0.05 451.80 0.07 451.90 0.09 452.00 0.10 452.10 0.12 452.20 0.13 452.30 0.14 452.40 0.15 452.50 0.16 452.60 0.16 452.70 0.17 452.80 0.18 452.90 0.19 453.00 0.19 453.10 0.20 453.20 0.21 453.30 0.21 453.40 0.22 453.50 0.23 453.60 0.23 453.70 0.24 453.80 0.24 453.90 0.25 454.00 0.25 454.10 0.26 454.20 0.26 454.30 0.27 454.40 0.27 454.50 0.28 454.60 0.28 454.70 0.29 454.80 0.29 454.90 0.30 455.00 0.30 455.10 0.31 455.20 0.31 455.30 0.32 455.40 0.32 455.50 0.33 455.60 0.37 455.70 0.45 455.80 0.53 455.90 0.58 456.00 0.62 456.10 0.66 456.20 0.70 456.30 0.73 456.40 0.76 456.50 0.79 456.60 0.82 Stage -Discharge for Pond 2P: Storage System #1 Elevation Primary (feet) (cfs) 456.70 0.85 456.80 0.87 456.90 0.90 457.00 0.92 457.10 0.95 457.20 0.97 457.30 0.99 457.40 1.01 457.50 1.03 457.60 1.05 457.70 1.07 457.80 1.09 457.90 1.11 458.00 1.13 458.10 1.15 458.20 1.16 458.30 1.18 458.40 1.20 458.50 1.22 458.60 1.23 458.70 1.25 458.80 1.26 458.90 1.28 459.00 1.73 459.10 2.53 459.20 3.55 459.30 4.75 459.40 6.10 459.50 7.57 459.60 9.16 459.70 10.85 459.80 12.64 Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 D 2010 H droCAl7 Software Solutions LLC Pae 15 Stage -Area -Storage for Pond 2P: Storage System #1 Elevation Storage (feet) (acre-feet) 451.50 0.000 451.60 0.000 451.70 0.000 451.80 0.000 451.90 0.001 452.00 0.001 452.10 0.002 452.20 0.002 452.30 0.003 452.40 0.004 452.50 0.004 452.60 0.005 452.70 0.006 452.80 0.007 452.90 0.007 453.00 0.008 453.10 0.009 453.20 0.010 453.30 0.011 453.40 0.012 453.50 0.013 453.60 0.014 453.70 0.015 453.80 0.016 453.90 0.017 454.00 0.019 454.10 0.020 454.20 0.021 454.30 0.022 454.40 0.023 454.50 0.024 454.60 0.025 454.70 0.027 454.80 0.028 454.90 0.029 455.00 0.030 455.10 0.031 455.20 0.032 455.30 0.034 455.40 0.035 455.50 0.036 455.60 0.037 455.70 0.039 455.80 0.040 455.90 0.041 456.00 0.042 456.10 0.043 456.20 0.045 456.30 0.046 456.40 0.047 456.50 0.048 456.60 0.049 Elevation Storage (feet) (acre-feet) 456.70 0.050 456.80 0.052 456.90 0.053 457.00 0.054 457.10 0.055 457.20 0.056 457.30 0.057 457.40 0.058 457.50 0.060 457.60 0.061 457.70 0.062 457.80 0.063 457.90 0.064 458.00 0.065 458.10 0.066 458.20 0.067 458.30 0.068 458.40 0.068 458.50 0.069 458.60 0.070 458.70 0.071 458.80 0.072 458.90 0.072 459.00 0.073 459.10 0.074 459.20 0.074 459.30 0.075 459.40 0.075 459.50 0.076 459.60 0.076 459.70 0.076 459.80 0.076 Post Area 01 Type 1124 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 16 Summary for Link 5L: Outfall Inflow Area = 1.730 ac, 30.64% Impervious, Inflow Depth > 1.84" for 2 -Year event Inflow = 2.67 cfs @ 12.09 hrs, Volume= 0.266 of Primary = 2.67 cfs @ 12.09 hrs, Volume= 0.266 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs FA 3 0 1 X Link 5L: Outfall Hydrograph 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Inflow ■ Primary Post Area #1 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Pae 17 Hydrograph for Link 5L: Outfall Time Inflow Elevation Primary hours) (cfs) (fEet efs 0.00 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.60 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.60 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.80 0.00 0.00 0.00 5.20 0.00 0.00 0.00 5.60 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.40 0.00 0.00 0.00 6.80 0.00 0.00 0.00 7.20 0.00 0.00 0.00 7.60 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.40 0.01 0.00 0.01 8.80 0.01 0.00 0.01 9.20 0.02 0.00 0.02 9.60 0.02 0.00 0.02 10.00 0.03 0.00 0.03 10.40 0.05 0.00 0.05 10.80 0.08 0.00 0.08 11.20 0.12 0.00 0.12 11.60 0.22 0.00 0.22 12.00 2.29 0.00 2.29 12.40 0.99 0.00 0.99 12.80 0.54 0.00 0.54 13.20 0.46 0.00 0.46 13.60 0.41 0.00 0.41 14.00 0.36 0.00 0.36 14.40 0.32 0.00 0.32 14.80 0.28 0.00 0.28 15.20 0.24 0.00 0.24 15.60 0.20 0.00 0.20 16.00 0.15 0.00 0.15 16.40 0.11 0.00 0.11 16.80 0.11 0.00 0.11 17.20 0.10 0.00 0.10 17.60 0.10 0.00 0.10 18.00 0.09 0.00 0.09 18.40 0.09 0.00 0.09 18.80 0.08 0.00 0.08 19.20 0.08 0.00 0.08 19.60 0.07 0.00 0.07 20.00 0.07 0.00 0.07 20.40 0.07 0.00 0.07 Time Inflow Elevation Primary hours cfs feet cfs 20.80 0.07 0.00 0.07 21.20 0.06 0.00 0.06 21.60 0.06 0.00 0.06 22.00 0.06 0.00 0.06 22.40 0.06 0.00 0.06 22.80 0.06 0.00 0.06 23.20 0.06 0.00 0.06 23.60 0.06 0.00 0.06 24.00 0.06 0.00 0.06 Post Area #1 Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Pa a 18 Time span=0.00-24.00 hrs, dt=0.02 hrs, 1201 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 3S: PostDev #1 Unrouted Runoff Area=1.040 ac 21.15% Impervious Runoff Depth>3.18" Flow Length=200' Tc=13.4 min CN=78 Runoff=4.52 cfs 0.276 of Subcatchment 4S: PostDev #1 to Storage Runoff Area=0.690 ac 44.93% Impervious Runoff Depth>3.88" Flow Length=200' Tc=9.4 min CN=85 Runoff=4.09 cfs 0.223 of Pond 2P: Storage System #1 Peak Elev=459.01' Storage=0.073 of Inflow=4.09 cfs 0.223 of Outflow=1.82 cfs 0.223 of Link 5L: Outfall Inflow=5.66 cfs 0.499 of Primary=5.66 cfs 0.499 of Total Runoff Area = 1.730 ac Runoff Volume = 0.499 of Average Runoff Depth = 3.46" 69.36% Pervious =1.200 ac 30.640/6 Impervious = 0.530 ac Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Paae 19 Summary for Subcatchment 3S: PostDev #1 Unrouted Runoff = 4.52 cfs @ 12.05 hrs, Volume= 0.276 af, Depth> 3.18" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area (ac) CN Descriotion 0.220 98 Paved parking, HSG C 0.600 74 >75% Grass cover, Good, HSG C 0.220 70 Woods. Good. HSG C 1.040 78 Weighted Average 0.820 0.13 78.85% Pervious Area 0.220 21.15% Impervious Area Tc Length Slope Velocity Capacity Description _(min) (_feet) (ft/ft) ft/sec (cfs) 12.5 100 0.0650 0.13 _ Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 0.9 100 0.1300 1.80 Shallow Concentrated Flow, Woodland Kv= 5.0 fns 13.4 200 Total Subcatchment 3S: PostDev #1 Unrouted Hydrograph 5 14.52 cfs Type 1124 -hr 10 -Year 4 Rainfall=5.56" Runoff Area=1.040 ac Runoff Volume=0.276 of 3 Runoff Depth>3.18" 3 Flow Length=200' 2 Tc=13.4 min CN=78 1 ' plr.%!////IJ//!///////!//!/ff//J/I///i .. �rarf�rri�Fr�r Err�rr r 0 2 4 6 8 10 12 14 16 18 Runoff Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Page 20 Hydrograph for Subcatchment 3S: PostDev #1 Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.05 0.00 0.00 1.20 0.07 0.00 0.00 1.60 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.40 0.15 0.00 0.00 2.80 0.18 0.00 0.00 3.20 0.21 0.00 0.00 3.60 0.24 0.00 0.00 4.00 0.27 0.00 0.00 4.40 0.30 0.00 0.00 4.80 0.33 0.00 0.00 5.20 0.37 0.00 0.00 5.60 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.40 0.49 0.00 0.00 6.80 0.53 0.00 0.00 7.20 0.57 0.00 0.00 7.60 0.62 0.00 0.00 8.00 0.67 0.00 0.01 8.40 0.72 0.01 0.01 8.80 0.78 0.02 0.02 9.20 0.85 0.03 0.03 9.60 0.92 0.04 0.04 10.00 1.01 0.06 0.05 10.40 1.11 0.09 0.07 10.80 1.23 0.13 0.10 11.20 1.40 0.19 0.16 11.60 1.71 0.33 0.30 12.00 3.69 1.64 4.03 12.40 4.03 1.91 0.87 12.80 4.22 2.06 0.40 13.20 4.36 2.18 0.30 13.60 4.47 2.27 0.24 14.00 4.56 2.34 0.20 14.40 4.64 2.41 0.17 14.80 4.71 2.47 0.16 15.20 4.78 2.52 0.15 15.60 4.84 2.58 0.13 16.00 4.89 2.62 0.12 16.40 4.94 2.66 0.11 16.80 4.99 2.70 0.11 17.20 5.04 2.74 0.10 17.60 5.08 2.78 0.10 18.00 5.12 2.81 0.09 18.40 5.16 2.85 0.09 18.80 5.20 2.88 0.08 19.20 5.23 2.91 0.08 19.60 5.26 2.94 0.07 20.00 5.29 2.96 0.07 20.40 5.32 2.99 0.06 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 5.35 3.01 0.06 21.20 5.38 3.04 0.06 21.60 5.41 3.06 0.06 22.00 5.43 3.08 0.06 22.40 5.46 3.11 0.06 22.80 5.48 3.13 0.06 23.20 5.51 3.15 0.06 23.60 5.54 3.17 0.06 24.00 5.56 3.19 0.06 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HvdroCAD Snflvrwo Solutions LLC _ P_ aqe 21 Summary for Subcatchment 4S: PostDev #1 to Storage System #1 Runoff = 4.09 cfs @ 12.01 hrs, Volume= 0.223 af, Depth> 3.88" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area (ac) CN Description 0.310 98 Paved parking, HSG C 0.380 74 >75% Grass cover, Good. HSG C 0.690 85 Weighted Average 0.380 55.07% Pervious Area 0.310 44.93% Impervious Area Tc Length Slope Velocity Capacity Description __(min) (feet) (ft/ft) (ft/sec)- (cfs) 9.1 100 0.0200 _ 0.18 Sheet Flow, Grass: Short n=0.150 P2=3.68" 0.3 100 0.0750 5.56 Shallow Concentrated Flow, Paved Kv= 20.3 fps 9.4 200 Total Subcatchment 4S: PostDev #1 to Storage System #1 Hydrograph 14.09 cfs Runoff 4 Type II 24 -hr 10 -Year Rainfall=5.56" Runoff Area=0.690 ac 3 Runoff Volume=0.223 of Runoff Depth>3.88" 3 Flow Length=200' U.° 2 Tc=9.4 min CN=85 1 1 ► -: �. ir��irf�i�irrf�ir�rir:rr�• rte- - - - �� ..r„s,, f, ..r „� . �,, t �, 0 2 4 6 8 10 12 14 16 18 20 22 24 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCADO 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 22 Hydrograph for Subcatchment 4S: PostDev #1 to Storage System #1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.80 0.05 0.00 0.00 1.20 0.07 0.00 0.00 1.60 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.40 0.15 0.00 0.00 2.80 0.18 0.00 0.00 3.20 0.21 0.00 0.00 3.60 0.24 0.00 0.00 4.00 0.27 0.00 0.00 4.40 0.30 0.00 0.00 4.80 0.33 0.00 0.00 5.20 0.37 0.00 0.00 5.60 0.41 0.00 0.00 6.00 0.44 0.00 0.01 6.40 0.49 0.01 0.01 6.80 0.53 0.02 0.01 7.20 0.57 0.02 0.02 7.60 0.62 0.03 0.02 8.00 0.67 0.05 0.02 8.40 0.72 0.06 0.03 8.80 0.78 0.08 0.04 9.20 0.85 0.11 0.05 9.60 0.92 0.14 0.05 10.00 1.01 0.18 0.07 10.40 1.11 0.23 0.09 10.80 1.23 0.29 0.12 11.20 1.40 0.39 0.18 11.60 1.71 0.59 0.33 12.00 3.69 2.18 4.08 12.40 4.03 2.49 0.51 12.80 4.22 2.65 0.28 13.20 4.36 2.78 0.21 13.60 4.47 2.88 0.17 14.00 4.56 2.96 0.14 14.40 4.64 3.04 0.12 14.80 4.71 3.10 0.11 15.20 4.78 3.16 0.11 15.60 4.84 3.22 0.10 16.00 4.89 3.27 0.09 16.40 4.94 3.32 0.08 16.80 4.99 3.36 0.08 17.20 5.04 3.40 0.07 17.60 5.08 3.44 0.07 18.00 5.12 3.48 0.07 18.40 5.16 3.52 0.06 18.80 5.20 3.55 0.06 19.20 5.23 3.58 0.06 19.60 5.26 3.61 0.05 20.00 5.29 3.64 0.05 20.40 5.32 3.67 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 20.80 5.35 3.69 0.05 21.20 5.38 3.72 0.04 21.60 5.41 3.74 0.04 22.00 5.43 3.77 0.04 22.40 5.46 3.79 0.04 22.80 5.48 3.82 0.04 23.20 5.51 3.84 0.04 23.60 5.54 3.87 0.04 24.00 5.56 3.89 0.04 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCADO 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 23 Summary for Pond 2P: Storage System #1 Inflow Area = 0.690 ac, 44.93% Impervious, Inflow Depth > 3.88" for 10 -Year event Inflow = 4.09 cfs @ 12.01 hrs, Volume= 0.223 of Outflow = 1.82 cfs @ 12.14 hrs, Volume= 0.223 af, Atten= 56%, Lag= 8.0 min Primary = 1.82 cfs @ 12.14 hrs, Volume= 0.223 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs Peak Elev= 459.01'@ 12.14 hrs Surf.Area= 0.007 ac Storage= 0.073 of Plug -Flow detention time= 36.9 min calculated for 0.223 of (100% of inflow) Center -of -Mass det. time= 36.6 min ( 838.9 - 802.2 ) Volume Invert Avail.Storage Storage Description #1 451.50' 0.076 of 96.0" D x 66.0'L Pipe Storage S= 0.0050T Device Routing Invert Outlet Devices #1 Primary 451.50' 15.0" Round Culvert L= 30.3' Ke= 0.500 Inlet / Outlet Invert= 451.50'/ 450.70' S= 0.0264'/' Cc= 0.900 n= 0.013 #2 Device 1 451.50' 2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 455.46' 4.2" Vert. Orifice/Grate C= 0.600 #4 Device 1 458.90' 4.2' long Sharp -Crested Rectangular Weir 2 End Contraction (s) Primary OutFlow Max=1.80 cfs @ 12.14 hrs HW=459.01' (Free Discharge) '�-- =Culvert (Passes 1.80 cfs of 15.50 cfs potential flow) 2=Orifice1Grate (Orifice Controls 0.45 cfs @ 13.10 fps) 3=Orifice/Grate (Orifice Controls 0.85 cfs @ 8.85 fps) -4--Sharp-Crested Rectangular Weir (Weir Controls 0.50 cfs @ 1.09 fps) Post Area 01 Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 sln 06538 © 2010 H droCAD Software Solutions LLC Page 24 Pond 2P: Storage System #1 Hydrograph 4 3 0 2 ic 1 W 458 a 457 w c 456 0 as 455 °J 454 453 452 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Pond 2P: Storage System #1 Stage -Discharge Sharp -Crested Rectangular Weir Orifice/Grate Culvert + Orifice/Grate 0 2 4 6 8 10 12 Discharge (cfs) ■ Inflow ■ Primary LE Primary Post Area 01 Type 1124 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC _ Paae 25 459 458 d 457 w v c 456 0 a. 455 w 454 453 452 Pond 2P: Storage System #1 Stage -Area -Storage 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 Storage (acre-feet) ■ Storage Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 26 Hydrograph for Pond 2P: Storage System #1 Time Inflow Storage Elevation Primary (hours) �Cfs] (acre-feet) (feet) cfs) 0.00 0.00 0.000 451.50 0.00 1.00 0.00 0.000 451.50 0.00 2.00 0.00 0.000 451.50 0.00 3.00 0.00 0.000 451.50 0.00 4.00 0.00 0.000 451.50 0.00 5.00 0.00 0.000 451.50 0.00 6.00 0.01 0.000 451.54 0.01 7.00 0.01 0.000 451.59 0.01 8.00 0.02 0.000 451.61 0.02 9.00 0.04 0.000 451.67 0.04 10.00 0.07 0.000 451.75 0.06 11.00 0.14 0.001 452.06 0.11 12.00 4.08 0.052 456.80 0.87 13.00 0.24 0.039 455.77 0.50 14.00 0.14 0.027 454.77 0.29 15.00 0.11 0.015 453.72 0.24 16.00 0.09 0.006 452.76 0.18 17.00 0.07 0.001 452.02 0.11 18.00 0.07 0.000 451.78 0.07 19.00 0.06 0.000 451.73 0.06 20.00 0.05 0.000 451.70 0.05 21.00 0.05 0.000 451.68 0.05 22.00 0.04 0.000 451.68 0.04 23.00 0.04 0.000 451.67 0.04 24.00 0.04 0.000 451.67 0.04 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 27 Elevation Primary (feet) (cfs) 451.50 0.00 451.60 0.02 451.70 0.05 451.80 0.07 451.90 0.09 452.00 0.10 452.10 0.12 452.20 0.13 452.30 0.14 452.40 0.15 452.50 0.16 452.60 0.16 452.70 0.17 452.80 0.18 452.90 0.19 453.00 0.19 453.10 0.20 453.20 0.21 453.30 0.21 453.40 0.22 453.50 0.23 453.60 0.23 453.70 0.24 453.80 0.24 453.90 0.25 454.00 0.25 454.10 0.26 454.20 0.26 454.30 0.27 454.40 0.27 454.50 0.28 454.60 0.28 454.70 0.29 454.80 0.29 454.90 0.30 455.00 0.30 455.10 0.31 455.20 0.31 455.30 0.32 455.40 0.32 455.50 0.33 455.60 0.37 455.70 0.45 455.80 0.53 455.90 0.58 456.00 0.62 456.10 0.66 456.20 0.70 456.30 0.73 456.40 0.76 456.50 0.79 456.60 0.82 Stage -Discharge for Pond 2P: Storage System 91 Elevation Primary (feet) (cfs) 456.70 0.85 456.80 0.87 456.90 0.90 457.00 0.92 457.10 0.95 457.20 0.97 457.30 0.99 457.40 1.01 457.50 1.03 457.60 1.05 457.70 1.07 457.80 1.09 457.90 1.11 458.00 1.13 458.10 1.15 458.20 1.16 458.30 1.18 458.40 1.20 458.50 1.22 458.60 1.23 458.70 1.25 458.80 1.26 458.90 1.28 459.00 1.73 459.10 2.53 459.20 3.55 459.30 4.75 459.40 6.10 459.50 7.57 459.60 9.16 459.70 10.85 459.80 12.64 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD@) 9.10 s/n 06538 © 2010 N droCAD Software Solutions LLC Pace 28 Stage -Area -Storage for Pond 2P: Storage System #1 Elevation Storage (feet) (acre-feet) 451.50 0.000 451.60 0.000 451.70 0.000 451.80 0.000 451.90 0.001 452.00 0.001 452.10 0.002 452.20 0.002 452.30 0.003 452.40 0.004 452.50 0.004 452.60 0.005 452.70 0.006 452.80 0.007 452.90 0.007 453.00 0.008 453.10 0.009 453.20 0.010 453.30 0.011 453.40 0.012 453.50 0.013 453.60 0.014 453.70 0.015 453.80 0.016 453.90 0.017 454.00 0.019 454.10 0.020 454.20 0.021 454.30 0.022 454.40 0.023 454.50 0.024 454.60 0.025 454.70 0.027 454.80 0.028 454.90 0.029 455.00 0.030 455.10 0.031 455.20 0.032 455.30 0.034 455.40 0.035 455.50 0.036 455.60 0.037 455.70 0.039 455.80 0.040 455.90 0.041 456.00 0.042 456.10 0.043 456.20 0.045 456.30 0.046 456.40 0.047 456.50 0.048 456.60 0.049 Elevation Storage (feet) (acre-feet) 456.70 0.050 456.80 0.052 456.90 0.053 457.00 0.054 457.10 0.055 457.20 0.056 457.30 0.057 457.40 0.058 457.50 0.060 457.60 0.061 457.70 0.062 457.80 0.063 457.90 0.064 458.00 0.065 458.10 0.066 458.20 0.067 458.30 0.068 458.40 0.068 458.50 0.069 458.60 0.070 458.70 0.071 458.80 0.072 458.90 0.072 459.00 0.073 459.10 0.074 459.20 0.074 459.30 0.075 459.40 0.075 459.50 0.076 459.60 0.076 459.70 0.076 459.80 0.076 Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Page 29 Summary for Link 5L: Outfall Inflow Area = 1.730 ac, 30.64% Impervious, Inflow Depth > 3.46" for 10 -Year event Inflow = 5.66 cfs @ 12.06 hrs, Volume= 0.499 of Primary = 5.66 cfs @ 12.06 hrs, Volume= 0.499 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.02 hrs 4 v 0 3 a 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Link 5L: Outfall Hydrograph Inflow ■ Primary Post Area #1 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 30 Hydrograph for Link 5L: Outfall Time Inflow Elevation Primary (hours) {Cfs) (feet) (Cfs) 0.00 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.60 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.60 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.80 0.00 0.00 0.00 5.20 0.00 0.00 0.00 5.60 0.00 0.00 0.00 6.00 0.01 0.00 0.01 6.40 0.01 0.00 0.01 6.80 0.01 0.00 0.01 7.20 0.02 0.00 0.02 7.60 0.02 0.00 0.02 8.00 0.03 0.00 0.03 8.40 0.04 0.00 0.04 8.80 0.06 0.00 0.06 9.20 0.07 0.00 0.07 9.60 0.09 0.00 0.09 10.00 0.11 0.00 0.11 10.40 0.15 0.00 0.15 10.80 0.20 0.00 0.20 11.20 0.28 0.00 0.28 11.60 0.46 0.00 0.46 12.00 4.90 0.00 4.90 12.40 1.98 0.00 1.98 12.80 1.12 0.00 1.12 13.20 0.63 0.00 0.63 13.60 0.55 0.00 0.55 14.00 0.49 0.00 0.49 14.40 0.44 0.00 0.44 14.80 0.41 0.00 0.41 15.20 0.37 0.00 0.37 15.60 0.34 0.00 0.34 16.00 0.30 0.00 0.30 16.40 0.26 0.00 0.26 16.80 0.23 0.00 0.23 17.20 0.19 0.00 0.19 17.60 0.17 0.00 0.17 18.00 0.16 0.00 0.16 18.40 0.15 0.00 0.15 18.80 0.14 0.00 0.14 19.20 0.13 0.00 0.13 19.60 0.13 0.00 0.13 20.00 0.12 0.00 0.12 20.40 0.11 0.00 0.11 Time Inflow Elevation Primary (hours) (Cfs) (feet) (Cfs) 20.80 0.11 0.00 0.11 21.20 0.11 0.00 0.11 21.60 0.11 0.00 0.11 22.00 0.10 0.00 0.10 22.40 0.10 0.00 0.10 22.80 0.10 0.00 0.10 23.20 0.10 0.00 0.10 23.60 0.10 0.00 0.10 24.00 0.10 0.00 0.10 is PostDev #2 Unrouted 7 3L Q-- 42P o----- 3S Outfall Storage System #2 (Sutcat (Reach on Link PostDev #2 to Storage System #2 Post Area 02 Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 @2010 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.040 55 Woods, Good, HSG B (3S) 0.270 70 Woods, Good, HSG C (1 S) 1.640 74 >75% Grass cover, Good, HSG C (1S, 3S) 0.250 98 Impervious (1S) 1.020 98 Paved parking, HSG B (3S) 3.220 TOTAL AREA Post Area 02 Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 1.060 HSG B 3S 1.910 HSG C 1 S, 3S 0.000 HSG D 0.250 Other is 3.220 TOTAL AREA Post Area #2 Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 4 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n DiamMidth Height Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 2P 463.50 462.50 73.2 0.0137 0.013 15.0 0.0 0.0 Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADC& 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 5 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: PostDev #2 Unrouted Runoff Area=1.640 ac 15.24% Impervious Runoff Depth>1.56" Flow Length=380' Tc=21.0 min CN=77 Runoff=2.74 cfs 0.213 of Subcatchment 3S: PostDev #2 to Storage Runoff Area=1.580 ac 64.56% Impervious Runoff Depth>2.52" Tc=6.5 min CN=89 Runoff=6.75 cfs 0.332 of Pond 2P: Storage System 92 Peak Elev=468.72' Storage=0.109 of Inflow=6.75 cfs 0.332 of Outflow=1.70 cfs 0.332 of Link 3L: Outfall Inflow=4.43 cfs 0.544 of Primary=4.43 cfs 0.544 of Total Runoff Area = 3.220 ac Runoff Volume = 0.544 of Average Runoff Depth = 2.03" 60.56% Pervious =1.950 ac 39.44% Impervious =1.270 ac Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H ciroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1 S: PostDev #2 Unrouted Runoff - 2.74 cfs @ 12.15 hrs, Volume= 0.213 af, Depth> 1.56" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24 -hr 2 -Year Rainfall=3.68" Area ac CN Description ` 0.250 98 Impervious 1.120 74 >75% Grass cover, Good, HSG C 0.270 70 Woods, Good, HSG C 1.640 77 Weighted Average 1.390 84.76% Pervious Area 0.250 Woods: Light underbrush n= 0.400 P2= 3.68" 15.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet/_ (ft/ft) ( sesec) (cfs 15.3 80 0.0250 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 5.7 300 0.0200 0.88 1.75 Channel Flow, Area= 2.0 sf Perim= 2.0' r= 1.00' n= 0.240 21.0 380 Total Subcatchment IS: PostDev #2 Unrouted Hydrograph 3 1 2.74 cfs Type II 24 -hr 2 -Year Rainfall=3.68" Runoff Area=1.640 ac 2 Runoff Volume=0.213 of Runoff Depth>1.56" Flow Length=380' ° Tc=21.0 min 1 CN=77 6 8 10 12 14 16 18 20 22 24 ■ Runoff Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 7 Hydrograph for Subcatchment IS: PostDev #2 Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.10 0.00 0.00 3.00 0.13 0.00 0.00 3.50 0.15 0.00 0.00 4.00 0.18 0.00 0.00 4.50 0.20 0.00 0.00 5.00 0.23 0.00 0.00 5.50 0.26 0.00 0.00 6.00 0.29 0.00 0.00 6.50 0.33 0.00 0.00 7.00 0.36 0.00 0.00 7.50 0.40 0.00 0.00 8.00 0.44 0.00 0.00 8.50 0.49 0.00 0.00 9.00 0.54 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.67 0.00 0.00 10.50 0.75 0.01 0.02 11.00 0.86 0.02 0.04 11.50 1.04 0.06 0.10 12.00 2.44 0.70 1.65 12.50 2.70 0.87 0.88 13.00 2.84 0.96 0.33 13.50 2.94 1.03 0.23 14.00 3.02 1.08 0.18 14.50 3.08 1.13 0.15 15.00 3.14 1.17 0.14 15.50 3.19 1.21 0.12 16.00 3.24 1.24 0.11 16.50 3.28 1.27 0.10 17.00 3.32 1.30 0.09 17.50 3.36 1.32 0.09 18.00 3.39 1.35 0.08 18.50 3.42 1.37 0.08 19.00 3.45 1.39 0.07 19.50 3.48 1.41 0.07 20.00 3.50 1.43 0.06 20.50 3.53 1.45 0.06 21.00 3.55 1.47 0.06 21.50 3.57 1.48 0.06 22.00 3.60 1.50 0.06 22.50 3.62 1.52 0.05 23.00 3.64 1.53 0.05 23.50 3.66 1.55 0.05 24.00 3.68 1.57 0.05 Post Area 02 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 8 Summary for Subcatchment 3S: PostDev #2 to Storage System #2 Runoff = 6.75 cfs @ 11.98 hrs, Volume= 0.332 af, Depth> 2.52" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24 -hr 2 -Year Rainfall=3.68" Area (ac) CN Description 1.020 98 Paved parking, HSG B 0.520 74 >75% Grass cover, Good, HSG C 0.040 55 Woods, Good. HSG B 1.580 89 Weighted Average 0.560 35.44% Pervious Area 1.020 64.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) _ 6.5 Direct Entry, Subcatchment 3S: PostDev #2 to Storage System #2 Hydrograph 7 6.75 cfs Type II 24 -hr 2 -Year 6 Rainfall=3.68" 5 Runoff Area=1.580 ac Runoff Volume=0.332 of 3 4 Runoff Depth>2.52" 0 3 Tc=6.5 min il:CN=89 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Runoff Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 9 Hydrograph for Subcatchment 3S: PostDev #2 to Storage System #2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.10 0.00 0.00 3.00 0.13 0.00 0.00 3.50 0.15 0.00 0.00 4.00 0.18 0.00 0.00 4.50 0.20 0.00 0.00 5.00 0.23 0.00 0.00 5.50 0.26 0.00 0.00 6.00 0.29 0.00 0.01 6.50 0.33 0.01 0.01 7.00 0.36 0.01 0.02 7.50 0.40 0.02 0.02 8.00 0.44 0.03 0.03 8.50 0.49 0.04 0.04 9.00 0.54 0.06 0.06 9.50 0.60 0.08 0.07 10.00 0.67 0.11 0.10 10.50 0.75 0.15 0.14 11.00 0.86 0.21 0.22 11.50 1.04 0.31 0.40 12.00 2.44 1.40 6.43 12.50 2.70 1.64 0.57 13.00 2.84 1.76 0.35 13.50 2.94 1.85 0.26 14.00 3.02 1.92 0.21 14.50 3.08 1.97 0.18 15.00 3.14 2.03 0.16 15.50 3.19 2.08 0.15 16.00 3.24 2.12 0.13 16.50 3.28 2.15 0.12 17.00 3.32 2.19 0.11 17.50 3.36 2.22 0.11 18.00 3.39 2.26 0.10 18.50 3.42 2.28 0.09 19.00 3.45 2.31 0.09 19.50 3.48 2.34 0.08 20.00 3.50 2.36 0.07 20.50 3.53 2.38 0.07 21.00 3.55 2.40 0.07 21.50 3.57 2.42 0.07 22.00 3.60 2.45 0.07 22.50 3.62 2.47 0.06 23.00 3.64 2.49 0.06 23.50 3.66 2.51 0.06 24.00 3.68 2.52 0.06 Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 HvdroCAD Software Solutions LLC Pae 10 Summary for Pond 2P: Storage System #2 Inflow Area = 1.580 ac, 64.56% Impervious, Inflow Depth > 2.52" for 2 -Year event Inflow = 6.75 cfs @ 11.98 hrs, Volume= 0.332 of Outflow = 1.70 cfs @ 12.12 hrs, Volume= 0.332 af, Atten= 75%, Lag= 8.8 min Primary = 1.70 cfs @ 12.12 hrs, Volume= 0.332 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 468.72' @ 12.12 hrs Surf.Area= 0.028 ac Storage= 0.109 of Plug -Flow detention time= 28.0 min calculated for 0.332 of (100% of inflow Center -of -Mass det. time= 27.8 min ( 829.9 - 802.1 ) Volume Invert Avail.Storaae Storaae Description #1 463.50' 0.197 of 108.0" D x 135.0'L Pipe Storage S= 0.0050T Device Routinq Invert Outlet Devices #1 Primary 463.50' 15.0" Round Culvert L= 73.2' CMP, projecting, no headwall, Ke= 0.900 Inlet/ Outlet Invert= 463.50'/462.50' S=0.0137'1' Cc= 0.900 n= 0.013 Concrete sewer w/manholes & inlets #2 Device 1 463.50' 4.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 468.30' 8.2" Vert. Orifice/Grate C= 0.600 #4 Primary 471.20' 3.5' long x 0.30' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.70 cfs @ 12.12 hrs HW=468.71' (Free Discharge) 1=Culvert (Passes 1.70 cfs of 9.99 cfs potential flow) N =Orifice/Grate (Orifice Controls 1.19 cfs @ 10.80 fps) =Orifice/Grate (Orifice Controls 0.51 cfs @ 2.19 fps) -4--Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Post Area 02 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC _ Page 11 Pond 2P: Storage System 02 Hydrograph v 3 0 7 Co 5 4 3 2 1 0 0 473 472 471 Z' 470 a. 469 C .a 468 467 W 466 465 464 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Pond 2P: Storage System #2 Stage -Discharge Sharp -Crested Rectangular Weir'_ otiffeelorate Culvert + Orifice/Grate 0 2 4 6 8 Discharge (cfs) 10 12 Inflow ■ Primary ■ Primary Post Area 02 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCADt7 9.10 sln 06538 © 2010 H droCAD Software Solutions LLC Pae 12 473 472 471 470 a, 469 468 467 W J R 465 464 Pond 2P: Storage System #2 Stage -Area -Storage 0 0.05 0.1 0.15 Storage (acre-feet) ■ Storage Post Area #2 Type 11 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCADO 9.10 s/n 06538 @2010 HydroCAD Software Solutions LLC _ _ Page 13 Hydrograph for Pond 2P: Storage System 92 Time Inflow Storage Elevation Primary hours) (cfs) (acre-feet feet cfs 0.00 0.00 0.000 463.50 0.00 0.50 0.00 0.000 463.50 0.00 1.00 0.00 0.000 463.50 0.00 1.50 0.00 0.000 463.50 0.00 2.00 0.00 0.000 463.50 0.00 2.50 0.00 0.000 463.50 0.00 3.00 0.00 0.000 463.50 0.00 3.50 0.00 0.000 463.50 0.00 4.00 0.00 0.000 463.50 0.00 4.50 0.00 0.000 463.50 0.00 5.00 0.00 0.000 463.50 0.00 5.50 0.00 0.000 463.51 0.00 6.00 0.01 0.000 463.53 0.01 6.50 0.01 0.000 463.55 0.01 7.00 0.02 0.000 463.57 0.02 7.50 0.02 0.000 463.60 0.02 8.00 0.03 0.000 463.61 0.03 8.50 0.04 0.000 463.63 0.04 9.00 0.06 0.000 463.65 0.06 9.50 0.07 0.000 463.67 0.07 10.00 0.10 0.000 463.70 0.10 10.50 0.14 0.000 463.75 0.14 11.00 0.22 0.001 463.84 0.21 11.50 0.40 0.002 464.08 0.33 12.00 6.43 0.084 467.82 1.08 12.50 0.57 0.095 468.19 1.13 13.00 0.35 0.068 467.23 1.00 13.50 0.26 0.042 466.23 0.85 14.00 0.21 0.020 465.27 0.67 14.50 0.18 0.005 464.38 0.44 15.00 0.16 0.000 463.79 0.17 15.50 0.15 0.000 463.76 0.15 16.00 0.13 0.000 463.74 0.13 16.50 0.12 0.000 463.73 0.12 17.00 0.11 0.000 463.72 0.11 17.50 0.11 0.000 463.72 0.11 18.00 0.10 0.000 463.71 0.10 18.50 0.09 0.000 463.70 0.09 19.00 0.09 0.000 463.69 0.09 19.50 0.08 0.000 463.68 0.08 20.00 0.07 0.000 463.67 0.07 20.50 0.07 0.000 463.67 0.07 21.00 0.07 0.000 463.67 0.07 21.50 0.07 0.000 463.66 0.07 22.00 0.07 0.000 463.66 0.07 22.50 0.06 0.000 463.66 0.06 23.00 0.06 0.000 463.66 0.06 23.50 0.06 0.000 463.66 0.06 24.00 0.06 0.000 463.65 0.06 Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Pace 14 Elevation Primary (feet) (Cfs) 463.50 0.00 463.60 0.03 463.70 0.09 463.80 0.18 463.90 0.25 464.00 0.30 464.10 0.34 464.20 0.38 464.30 0.42 464.40 0.45 464.50 0.48 464.60 0.51 464.70 0.54 464.80 0.56 464.90 0.59 465.00 0.61 465.10 0.63 465.20 0.65 465.30 0.68 465.40 0.70 465.50 0.72 465.60 0.74 465.70 0.75 465.80 0.77 465.90 0.79 466.00 0.81 466.10 0.83 466.20 0.84 466.30 0.86 466.40 0.88 466.50 0.89 466.60 0.91 466.70 0.92 466.80 0.94 466.90 0.95 467.00 0.97 467.10 0.98 467.20 1.00 467.30 1.01 467.40 1.02 467.50 1.04 467.60 1.05 467.70 1.07 467.80 1.08 467.90 1.09 468.00 1.10 468.10 1.12 468.20 1.13 468.30 1.14 468.40 1.19 468.50 1.30 468.60 1.47 Stage -Discharge for Pond 2P: Storage System 02 Elevation Primary (feet) (Cfs) 468.70 1.67 468.80 1.89 468.90 2.11 469.00 2.28 469.10 2.43 469.20 2.57 469.30 2.69 469.40 2.81 469.50 2.92 469.60 3.02 469.70 3.12 469.80 3.22 469.90 3.31 470.00 3.39 470.10 3.48 470.20 3.56 470.30 3.64 470.40 3.72 470.50 3.80 470.60 3.87 470.70 3.94 470.80 4.01 470.90 4.08 471.00 4.15 471.10 4.22 471.20 4.28 471.30 4.71 471.40 5.42 471.50 6.32 471.60 7.02 471.70 7.56 471.80 8.03 471.90 8.45 472.00 8.84 472.10 9.20 472.20 9.54 472.30 9.87 472.40 10.18 472.50 10.47 472.60 10.76 472.70 11.03 472.80 11.30 472.90 11.56 473.00 11.81 473.10 12.05 Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 15 Elevation Storage (feet) (acre-feet) 463.50 0.000 463.60 0.000 463.70 0.000 463.80 0.000 463.90 0.001 464.00 0.001 464.1'0 0.002 464.20 0.003 464.30 0.004 464.40 0.005 464.50 0.007 464.60 0.008 464.70 0.010 464.80 0.011 464.90 0.013 465.00 0.015 465.10 0.017 465.20 0.019 465.30 0.021 465.40 0.023 465.50 0.025 465.60 0.027 465.70 0.030 465.80 0.032 465.90 0.034 466.00 0.037 466.10 0.039 466.20 0.041 466.30 0.044 466.40 0.046 466.50 0.049 466.60 0.051 466.70 0.054 466.80 0.057 466.90 0.059 467.00 0.062 467.10 0.065 467.20 0.067 467.30 0.070 467.40 0.073 467.50 0.075 467.60 0.078 467.70 0.081 467.80 0.084 467.90 0.086 468.00 0.089 468.10 0.092 468.20 0.095 468.30 0.098 468.40 0.100 468.50 0.103 468.60 0.106 Stage -Area -Storage for Pond 2P: Storage System 92 Elevation Storage (feet) (acre-feet) 468.70 0.109 468.80 0.111 468.90 0.114 469.00 0.117 469.10 0.120 469.20 0.122 469.30 0.125 469.40 0.128 469.50 0.131 469.60 0.133 469.70 0.136 469.80 0.139 469.90 0.141 470.00 0.144 470.10 0.146 470.20 0.149 470.30 0.151 470.40 0.154 470.50 0.156 470.60 0.159 470.70 0.161 470.80 0.164 470.90 0.166 471.00 0.168 471.10 0.170 471.20 0.173 471.30 0.175 471.40 0.177 471.50 0.179 471.60 0.181 471.70 0.183 471.80 0.184 471.90 0.186 472.00 0.188 472.10 0.189 472.20 0.191 472.30 0.192 472.40 0.193 472.50 0.194 472.60 0.195 472.70 0.196 472.80 0.197 472.90 0.197 473.00 0.197 473.10 0.197 Post Area #2 Type// 24 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Paae 16 Summary for Link 3L: Outfall Inflow Area = 3.220 ac, 39.44% Impervious, Inflow Depth > 2.03" for 2 -Year event Inflow = 4.43 cfs @ 12.13 hrs, Volume= 0.544 of Primary = 4.43 cfs @ 12.13 hrs, Volume= 0.544 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs 4 w 3 v 3 0 2 1 Link 3L: Outfall Hydrograph Eel 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Inflow ■ Primary Post Area 02 Type 1124 -hr 2 -Year Rainfall=3.68" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Paae 17 Hydrograph for Link 3L: Outfall Time Inflow Elevation Primary (hours) (Cfs) (feet) (Cfs) 0.00 0.00 0.00 0.00 0.50 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.50 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.50 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.50 0.00 0.00 0.00 6.00 0.01 0.00 0.01 6.50 0.01 0.00 0.01 7.00 0.02 0.00 0.02 7.50 0.02 0.00 0.02 8.00 0.03 0.00 0.03 8.50 0.04 0.00 0.04 9.00 0.06 0.00 0.06 9.50 0.07 0.00 0.07 10.00 0.10 0.00 0.10 10.50 0.15 0.00 0.15 11.00 0.25 0.00 0.25 11.50 0.44 0.00 0.44 12.00 2.73 0.00 2.73 12.50 2.01 0.00 2.01 13.00 1.33 0.00 1.33 13.50 1.08 0.00 1.08 14.00 0.85 0.00 0.85 14.50 0.60 0.00 0.60 15.00 0.31 0.00 0.31 15.50 0.27 0.00 0.27 16.00 0.24 0.00 0.24 16.50 0.22 0.00 0.22 17.00 0.21 0.00 0.21 17.50 0.19 0.00 0.19 18.00 0.18 0.00 0.18 18.50 0.17 0.00 0.17 19.00 0.16 0.00 0.16 19.50 0.15 0.00 0.15 20.00 0.13 0.00 0.13 20.50 0.13 0.00 0.13 21.00 0.13 0.00 0.13 21.50 0.12 0.00 0.12 22.00 0.12 0.00 0.12 22.50 0.12 0.00 0.12 23.00 0.12 0.00 0.12 23.50 0.11 0.00 0.11 24.00 0.11 0.00 0.11 Post Area #2 Type 1124 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Pae 18 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR -20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: PostDev #2 Unrouted Runoff Area=1.640 ac 15.24% Impervious Runoff Depth>3.08" Flow Length=380' Tc=21.0 min CN=77 Runoff=5.50 cfs 0.421 of Subcatchment 3S: PostDev 92 to Storage Runoff Area=1.580 ac 64.56% Impervious Runoff Depth>4.30" Tc=6.5 min CN=89 Runoff=11.15 cfs 0.567 of Pond 2P: Storage System #2 Peak Elev=471.28' Storage=0.174 of Inflow=11.15 cfs 0.567 of Outflow=4.60 cfs 0.567 of Link 3L: Outfall Inflow=9.77 cfs 0.988 of Primary=9.77 cfs 0.988 of Total Runoff Area = 3.220 ac Runoff Volume = 0.988 of Average Runoff Depth = 3.68" 60.56% Pervious = 1.950 ac 39.44% Impervious = 1.270 ac Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment IS: PostDev #2 Unrouted Runoff = 5.50 cfs @ 12.14 hrs, Volume= 0.421 af, Depth> 3.08" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area ac CN Description " 0.250 98 Impervious 1.120 74 >75% Grass cover, Good, HSG C 0.270 70 Woods, Good, HSG C 1.640 77 Weighted Average 1.390 84.76% Pervious Area 0.250 Woods: Light underbrush n= 0.400 P2= 3.68" 15.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) _ (cfs) 15.3 80 0.0250 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.68" 5.7 300 0.0200 0.88 1.75 Channel Flow, Area= 2.0 sf Perim= 2.0' r- 1.00' n= 0.240 21.0 380 Total Subcatchment 1S: PostDev#2 Unrouted Hydrograph 6 5.5_0_ cfs_ Type II 24 -hr 10 -Year 5 Rainfall=5.56" Runoff Area=1.640 ac 4 Runoff Volume=0.421 of 0 Runoff Depth>3.08" 33 Flow Length=380' ° Tc=21.0 min u. 2 CN=77 E / -- 1 2 4 6 8 10 12 14 16 18 20 22 24 1. ■ Runoff Post Area #2 Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 20 Hydrograph for Subcatchment 1 S: PostDev #2 Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.06 0.00 0.00 1.50 0.09 0.00 0.00 2.00 0.12 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.19 0.00 0.00 3.50 0.23 0.00 0.00 4.00 0.27 0.00 0.00 4.50 0.31 0.00 0.00 5.00 0.35 0.00 0.00 5.50 0.40 0.00 0.00 6.00 0.44 0.00 0.00 6.50 0.50 0.00 0.00 7.00 0.55 0.00 0.00 7.50 0.61 0.00 0.00 8.00 0.67 0.00 0.00 8.50 0.74 0.01 0.01 9.00 0.82 0.02 0.03 9.50 0.91 0.03 0.04 10.00 1.01 0.05 0.06 10.50 1.13 0.08 0.10 11.00 1.31 0.14 0.17 11.50 1.57 0.24 0.31 12.00 3.69 1.57 3.56 12.50 4.09 1.88 1.66 13.00 4.29 2.04 0.60 13.50 4.44 2.16 0.42 14.00 4.56 2.26 0.33 14.50 4.66 2.34 0.27 15.00 4.75 2.41 0.24 15.50 4.82 2.48 0.22 16.00 4.89 2.53 0.19 16.50 4.96 2.59 0.17 17.00 5.01 2.63 0.16 17.50 5.07 2.68 0.15 18.00 5.12 2.72 0.15 18.50 5.17 2.77 0.14 19.00 5.21 2.80 0.13 19.50 5.26 2.84 0.12 20.00 5.29 2.87 0.11 20.50 5.33 2.90 0.10 21.00 5.36 2.93 0.10 21.50 5.40 2.96 0.10 22.00 5.43 2.99 0.10 22.50 5.47 3.02 0.09 23.00 5.50 3.04 0.09 23.50 5.53 3.07 0.09 24.00 5.56 3.10 0.09 Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 IHydroCADO 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 21 Summary for Subcatchment 3S: PostDev #2 to Storage System #2 Runoff = 11.15 cfs @ 11.97 hrs, Volume= 0.567 af, Depth> 4.30" Runoff by SCS TR -20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24 -hr 10 -Year Rainfall=5.56" Area ac CN Descrip#ion 1.020 98 Paved parking, HSG B 0.520 74 >75% Grass cover, Good, HSG C 0.040 55 Woods, Good, HSG B 1.580 89 Weighted Average 0.560 35.44% Pervious Area 1.020 64.56% Impervious Area Tc Length Slope Velocity Capacity Description _ (min) (feet) ft/ft) (ft/sec) (cfs) 6.5 u Direct Entry, Subcatchment 3S: PostDev #2 to Storage System #2 Hydrograph 12 11.15 EfS] 11 Type II 24 -hr 10 -Year 10 Rainfall=5.56" 9 Runoff Area=1.580 ac 8 Runoff Volume=0.567 of IS 3 6 Runoff Depth>4.30" 0 5 Tc=6.5 min 9:CN=89 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) ■ Runoff Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 @2010 HydroCAD Software Solutions LLC Paae 22 Hydrograph for Subcatchment 3S: PostDev #2 to Storage System #2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.06 0.00 0.00 1.50 0.09 0.00 0.00 2.00 0.12 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.19 0.00 0.00 3.50 0.23 0.00 0.00 4.00 0.27 0.00 0.00 4.50 0.31 0.00 0.01 5.00 0.35 0.01 0.02 5.50 0.40 0.02 0.03 6.00 0.44 0.03 0.04 6.50 0.50 0.04 0.05 7.00 0.55 0.06 0.06 7.50 0.61 0.08 0.07 8.00 0.67 0.11 0.08 8.50 0.74 0.14 0.11 9.00 0.82 0.18 0.14 9.50 0.91 0.23 0.16 10.00 1.01 0.29 0.21 10.50 1.13 0.37 0.29 11.00 1.31 0.49 0.42 11.50 1.57 0.69 0.74 12.00 3.69 2.53 10.57 12.50 4.09 2.90 0.91 13.00 4.29 3.10 0.55 13.50 4.44 3.24 0.42 14.00 4.56 3.35 0.33 14.50 4.66 3.44 0.29 15.00 4.75 3.53 0.26 15.50 4.82 3.60 0.23 16.00 4.89 3.67 0.20 16.50 4.96 3.73 0.19 17.00 5.01 3.79 0.18 17.50 5.07 3.84 0.17 18.00 5.12 3.89 0.16 18.50 5.17 3.93 0.14 19.00 5.21 3.98 0.13 19.50 5.26 4.02 0.12 20.00 5.29 4.05 0.11 20.50 5.33 4.09 0.11 21.00 5.36 4.12 0.11 21.50 5.40 4.15 0.10 22.00 5.43 4.19 0.10 22.50 5.47 4.22 0.10 23.00 5.50 4.25 0.10 23.50 5.53 4.28 0.10 24.00 5.56 4.31 0.09 Post Area #2 Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD@ 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Paae 23 Summary for Pond 2P: Storage System #2 Inflow Area = 1.580 ac, 64.56% Impervious, Inflow Depth > 4.30" for 10 -Year event Inflow = 11.15 cfs @ 11.97 hrs, Volume= 0.567 of Outflow = 4.60 cfs @ 12.08 hrs, Volume= 0.567 af, Atten= 59%, Lag= 6.4 min Primary = 4.60 cfs @ 12.08 hrs, Volume= 0.567 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 471.28'@ 12.08 hrs Surf.Area= 0.021 ac Storage= 0.174 of Plug -Flow detention time= 25.9 min calculated for 0.566 of (100% of inflow Center -of -Mass det. time= 25.7 min ( 812.8 - 787.1 ) Volume Invert Avail.Storaae Storaae DescriDtion #1 463.50' 0.197 of 108.0" D x 135.0'L Pipe Storage S= 0.0050'r Device Routina Invert Outlet Devices #1 Primary 463.50' 15.0" Round Culvert L= 73.2' CMP, projecting, no headwall, Ke= 0.900 Inlet/ Outlet Invert= 463.50'/ 462.50' S=0.0137'/' Cc= 0.900 n= 0.013 Concrete sewer w/manholes & inlets #2 Device 1 463.50' 4.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 468.30' 8.2" Vert. Orifice/Grate C= 0.600 #4 Primary 471.20' 3.5' long x 0.30' rise Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=4.56 cfs @ 12.08 hrs HW=471.27' (Free Discharge) 1=Culvert (Passes 4.33 cfs of 12.47 cfs potential flow) L2=Orifice/Grate (Orifice Controls 1.46 cfs @ 13.26 fps) 3=Orifice/Grate (Orifice Controls 2.87 cfs @ 7.81 fps) 4--Sharp-Crested Rectangular Weir (Weir Controls 0.23 cfs @ 0.89 fps) Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HvdroCAD® 9.10 s/n 06538 © 2010 H droCAD Software Solutions LLC Page 24 Pond 2P: Storage System #2 Hydrograph 12 11 10 9 y 8 v 7 3 6 0 5 4 3 2 1 0 0 473 472 471 470 a, 469 �v 468 467 W 466 465 464 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Pond 2P: Storage System #2 Stage -Discharge Sharp -Crested Rectangular Weir Orifice/Grate V_—' Culvert + Orifice/Grate 0 2 4 6 8 Discharge (cfs) 10 12 Inflow ■ Primary ■ Primary Post Area 02 Type 1124 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD@ 9.10 s/n 06538 Q 2010 HydroCA❑ Software Solutions LLC Pace 25 473 472 471 d 470 a, c 469 468 467 W a•• 465 464 Pond 2P: Storage System 02 Stage -Area -Storage 0 0.05 0.1 0.15 Storage (acre-feet) ■ Storage Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 26 Hydrograph for Pond 2P: Storage System #2 Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 463.50 0.00 0.50 0.00 0.000 463.50 0.00 1.00 0.00 0.000 463.50 0.00 1.50 0.00 0.000 463.50 0.00 2.00 0.00 0.000 463.50 0.00 2.50 0.00 0.000 463.50 0.00 3.00 0.00 0.000 463.50 0.00 3.50 0.00 0.000 463.50 0.00 4.00 0.00 0.000 463.51 0.00 4.50 0.01 0.000 463.54 0.01 5.00 0.02 0.000 463.58 0.02 5.50 0.03 0.000 463.60 0.03 6.00 0.04 0.000 463.62 0.04 6.50 0.05 0.000 463.64 0.05 7.00 0.06 0.000 463.65 0.06 7.50 0.07 0.000 463.67 0.07 8.00 0.08 0.000 463.69 0.08 8.50 0.11 0.000 463.72 0.11 9.00 0.14 0.000 463.76 0.14 9.50 0.16 0.000 463.78 0.16 10.00 0.21 0.000 463.83 0.20 10.50 0.29 0.001 463.94 0.27 11.00 0.42 0.002 464.15 0.36 11.50 0.74 0.008 464.59 0.51 12.00 10.57 0.150 470.26 3.61 12.50 0.91 0.114 468.90 2.11 13.00 0.55 0.088 467.97 1.10 13.50 0.42 0.065 467.12 0.98 14.00 0.33 0.042 466.24 0.85 14.50 0.29 0.023 465.40 0.69 15.00 0.26 0.009 464.65 0.52 15.50 0.23 0.002 464.05 0.32 16.00 0.20 0.001 463.84 0.20 16.50 0.19 0.000 463.82 0.19 17.00 0.18 0.000 463.80 0.18 17.50 0.17 0.000 463.79 0.17 18.00 0.16 0.000 463.78 0.16 18.50 0.14 0.000 463.76 0.15 19.00 0.13 0.000 463.75 0.13 19.50 0.12 0.000 463.74 0.12 20.00 0.11 0.000 463.73 0.11 20.50 0.11 0.000 463.72 0.11 21.00 0.11 0.000 463.72 0.11 21.50 0.10 0.000 463.72 0.10 22.00 0.10 0.000 463.71 0.10 22.50 0.10 0.000 463.71 0.10 23.00 0.10 0.000 463.71 0.10 23.50 0.10 0.000 463.71 0.10 24.00 0.09 0.000 463.70 0.09 Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Paae 27 Elevation Primary (feet) (cfs) 463.50 0.00 463.60 0.03 463.70 0.09 463.80 0.18 463.90 0.25 464.00 0.30 464.10 0.34 464.20 0.38 464.30 0.42 464.40 0.45 464.50 0.48 464.60 0.51 464.70 0.54 464.80 0.56 464.90 0.59 465.00 0.61 465.10 0.63 465.20 0.65 465.30 0.68 465.40 0.70 465.50 0.72 465.60 0.74 465.70 0.75 465.80 0.77 465.90 0.79 466.00 0.81 466.10 0.83 466.20 0.84 466.30 0.86 466.40 0.88 466.50 0.89 466.60 0.91 466.70 0.92 466.80 0.94 466.90 0.95 467.00 0.97 467.10 0.98 467.20 1.00 467.30 1.01 467.40 1.02 467.50 1.04 467.60 1.05 467.70 1.07 467.80 1.08 467.90 1.09 468.00 1.10 468.10 1.12 468.20 1.13 468.30 1.14 468.40 1.19 468.50 1.30 468.60 1.47 Stage -Discharge for Pond 2P: Storage System 92 Elevation Primary (feet) (cfs) 468.70 1.67 468.80 1.89 468.90 2.11 469.00 2.28 469.10 2.43 469.20 2.57 469.30 2.69 469.40 2.81 469.50 2.92 469.60 3.02 469.70 3.12 469.80 3.22 469.90 3.31 470.00 3.39 470.10 3.48 470.20 3.56 470.30 3.64 470.40 3.72 470.50 3.80 470.60 3.87 470.70 3.94 470.80 4.01 470.90 4.08 471.00 4.15 471.10 4.22 471.20 4.28 471.30 4.71 471.40 5.42 471.50 6.32 471.60 7.02 471.70 7.56 471.80 8.03 471.90 8.45 472.00 8.84 472.10 9.20 472.20 9.54 472.30 9.87 472.40 10.18 472.50 10.47 472.60 10.76 472.70 11.03 472.80 11.30 472.90 11.56 473.00 11.81 473.10 12.05 Post Area #2 Type// 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 28 Stage -Area -Storage for Pond 2P: Storage System #2 Elevation Storage (feet) (acre-feet) 463.50 0.000 463.60 0.000 463.70 0.000 463.80 0.000 463.90 0.001 464.00 0.001 464.10 0.002 464.20 0.003 464.30 0.004 464.40 0.005 464.50 0.007 464.60 0.008 464.70 0.010 464.80 0.011 464.90 0.013 465.00 0.015 465.10 0.017 465.20 0.019 465.30 0.021 465.40 0.023 465.50 0.025 465.60 0.027 465.70 0.030 465.80 0.032 465.90 0.034 466.00 0.037 466.10 0.039 466.20 0.041 466.30 0.044 466.40 0.046 466.50 0.049 466.60 0.051 466.70 0.054 466.80 0.057 466.90 0.059 467.00 0.062 467.10 0.065 467.20 0.067 467.30 0.070 467.40 0.073 467.50 0.075 467.60 0.078 467.70 0.081 467.80 0.084 467.90 0.086 468.00 0.089 468.10 0.092 468.20 0.095 468.30 0.098 468.40 0.100 468.50 0.103 468.60 0.106 Elevation Storage (feet) (acre-feet) 468.70 0.109 468.80 0.111 468.90 0.114 469.00 0.117 469.10 0.120 469.20 0.122 469.30 0.125 469.40 0.128 469.50 0.131 469.60 0.133 469.70 0.136 469.80 0.139 469.90 0.141 470.00 0.144 470.10 0.146 470.20 0.149 470.30 0.151 470.40 0.154 470.50 0.156 470.60 0.159 470.70 0.161 470.80 0.164 470.90 0.166 471.00 0.168 471.10 0.170 471.20 0.173 471.30 0.175 471.40 0.177 471.50 0.179 471.60 0.181 471.70 0.183 471.80 0.184 471.90 0.186 472.00 0.188 472.10 0.189 472.20 0.191 472.30 0.192 472.40 0.193 472.50 0.194 472.60 0.195 472.70 0.196 472.80 0.197 472.90 0.197 473.00 0.197 473.10 0.197 Post Area #2 Type// 24 -hr 10=Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 H droCACO9.10 stn 06538 v 2010 H droCAO Software Solutions LLC Pn f 29 Summary for Link 3L: Outfall Inflow Area = 3.220 ac, 39.44% Impervious, Inflow Depth > 3.68" for 10 -Year event Inflow = 9.77 cfs @ 12.09 hrs, Volume= 0.988 of Primary = 9.77 cfs @ 12.09 hrs, Volume= 0.988 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs 10 9 8 7 v 6 0 5 4 3 2 1 0 Link 3L: Outfall Hydrograph 0 2 4 6 8 10 12 14 16 18 20 22 24 Time (hours) Inflow ■ Primary Post Area #2 Type 11 24 -hr 10 -Year Rainfall=5.56" Prepared by TIMMONS GROUP Printed 11/11/2015 HydroCAD® 9.10 s/n 06538 © 2010 HydroCAD Software Solutions LLC Page 30 Hydrograph for Link 3L: Outfall Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.50 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.50 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.50 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.50 0.01 0.00 0.01 5.00 0.02 0.00 0.02 5.50 0.03 0.00 0.03 6.00 0.04 0.00 0.04 6.50 0.05 0.00 0.05 7.00 0.06 0.00 0.06 7.50 0.07 0.00 0.07 8.00 0.09 0.00 0.09 8.50 0.12 0.00 0.12 9.00 0.17 0.00 0.17 9.50 0.20 0.00 0.20 10.00 0.26 0.00 0.26 10.50 0.37 0.00 0.37 11.00 0.53 0.00 0.53 11.50 0.82 0.00 0.82 12.00 7.17 0.00 7.17 12.50 3.77 0.00 3.77 13.00 1.70 0.00 1.70 13.50 1.40 0.00 1.40 14.00 1.17 0.00 1.17 14.50 0.97 0.00 0.97 15.00 0.77 0.00 0.77 15.50 0.54 0.00 0.54 16.00 0.40 0.00 0.40 16.50 0.36 0.00 0.36 17.00 0.34 0.00 0.34 17.50 0.32 0.00 0.32 18.00 0.30 0.00 0.30 18.50 0.28 0.00 0.28 19.00 0.26 0.00 0.26 19.50 0.24 0.00 0.24 20.00 0.22 0.00 0.22 20.50 0.21 0.00 0.21 21.00 0.21 0.00 0.21 21.50 0.20 0.00 0.20 22.00 0.20 0.00 0.20 22.50 0.19 0.00 0.19 23.00 0.19 0.00 0.19 23.50 0.19 0.00 0.19 24.00 0.18 0.00 0.18