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WPO201400002 Calculations 2014-01-15
AGNOR-HURT ELEMENTARY SCHOOL RENOVATIONS AND ADDITIONS CHARLOTTESVILLE, VIRGINIA MAJOR SITE PLAN AMENDMENT DESIGN CALCULATIONS JANUARY 13, 2014 REVISED: MAY 27, 2014 • TIMMONS GROUP •/i 7i e t 6,4,6 Prepared by: Craig Kotarski, PE r �W Timmons Group 919 2nd Street S.E. I 'I(' Charlottesville, VA 22901 11/4 434.295.5624 Table of Contents Section Title 1 Stormwater Management Narrative 2 Water Quality Calculations 3 Culvert Calculations 4 LD 229—Storm Sewer Design Computations 5 LD 204—Storm Inlet Design Computations 6 LD347 Hydraulic Grade Line Analysis to Upper Pond 7 LD347 Hydraulic Grade Line Analysis to Lower Pond 8 LD347 Hydraulic Grade Line Analysis to STR400 9 Sediment Basin Routing HydroCAD 10 Pre-developed Calculations North Area HydroCAD 11 Pre-developed Calculations Ponds HydroCAD 12 Post-developed Calculations North Area HydroCAD 13 Post-developed Calculations Ponds HydroCAD Agnor-Hurt Elementary School Renovations and Additions Stormwater Management Narrative Agnor-Hurt Elementary School Renovations and Additions are within the South Fork Rivanna drainage district. This project will involve two building additions, one to the north and one to the south east of the existing building. The parking lot to the south east will be modified. A bus loop with a connecting road to Woodburn Road will be added to the north of the existing building. The total disturbed area will be 5.38 acres. Existing Conditions and Proposed Changes: The south east area is currently sidewalks,roads and grass islands (see sheet C6.1). The smaller building addition will be in front of the existing school an area that is currently sidewalks. The roads,parking lots and sidewalks will be reconfigured to maximize parking and allow for a car drop off loop. The south east area currently drains south to two existing ponds that drain into a closed pipe system. The north area is currently woods, grass,pavement,play areas and a few sheds(see sheet C6.1). The larger building addition will be constructed on the north side of the existing building. The site will be cleared and regraded to allow for installation of the bus loop, connector road and sidewalks. The north area currently drains to an open channel that follows south off the property. The changes to the site will increase the impervious area by a total of 1.01 acres. Water Quantity: In the proposed condition the total volume of flow and the two and ten year storm flows into the open channel from the north area will be kept the same as in the pre-condition. This will be accomplished by piping an area of the water from the north area to the upper pond on the south side of the site. The outfall from the upper pond will be modified with the addition of a riser structure with an orifice. This will reduce the flow back to the existing condition for both the two and ten year storm events. All stormwater from the ponds drain in a closed pipe system across the Rio Hill Shopping Center down across Route 29, eventually ending up behind the Woodbrook neighborhood. At this point the project's contributing drainage area is less than 1%of the overall drainage area. The reduction of the post-development flow rates to meet the pre-development flow rates will not overbear the existing system. Furthermore,the added volume of stormwater will not have adverse effects on the manmade system. Water Quality: The additional pollutants from the 1.01 acre increase in impervious area will be offset by the use of two cartridge filter systems with 50%removal on a portion of the north area and the pipe system that drains south to the upper pond. Water quality calculations are shown below. Water Quality Calculations (Total Site) Area= 5.38 acres Pre Impervious Area=2.05 acres Post Impervious Area= 3.06 acres I pre= 38.10% L pre=4.82 pounds I post= 56.88% L post=6.89 pounds Removal Required: 6.89—0.9*4.82 =2.55 pounds Treatment: Cartridge Filter#1: Area=3.90 acres Impervious Area= 1.52 acres I treat=38.97% L treat=3.56 Removal Rate= 50% Pounds Removed=3.56*0.50= 1.78 pounds Cartridge Filter#2: Area=2.26 acres Impervious Area=0.92 acres I treat=40.70% L treat=2.15 Removal Rate= 50% Pounds Removed=2.15*0.50= 1.07 pounds Total Treatment: Removal Required=2.55 pounds Total pound removed= 1.78 + 1.07=2.85 pounds 0 G F m �+ c 0 Q.�+ W y 8._ > 2 o> z Q z , N p z z : 0 : y a w w a a 0 0 ° 1 _ M z C o z w Y , 0 0 0 z Z O LX4 a a > a p ° ° w 0 0 o p w 0 > 0 p w m ° 3'W 3 o .- Q om > i c` E z a e, E z T U O 0 3 a • a O m I 3 ' ,.; z p m z rn 0, 0, - C m ° ++ rn w O ¢ 4e+ a ".'+' a C71. v>a ' u m a a a a i z - o Y m ,1 + F F o .n 0 a I '.0 '-= 0 o !! u > .0 x j m F o U C -, W 5 v O O " D o c >, = W o N S Z 3 - w° 'o CC .a _ o 0 o d 3 o £ w C7 .� 0 Y 6 0 0 0 '° n c O Z z a x s F f, ZO 0 E-- _° z .0 NO .o "' - 0 m O Q 0 0 0 - r.. a > V F 0 C ,. a a W .R ,' 0 O N O W 3 0 0 0 - 0 v - O N i U > F Z vZ OQ a .7 O a V 9 Z 0 0 O 0 5 2 z 0 z is a o 0 0 F s.o' ° O w w a F a o _ F a d ri+ o o .n w S' W Z 3 0 0 6 a EX 4 Z o -1 , 01 F z 5 — m Z Z 0 0 3 0 0 0 + 0 5 7 o� 5 - 0 rn rn a r 5 S o u ° r E- -0 3 u - z o °o o° a 3 W z 3 d—=—R s , 0 0 0 { W F Q O 1 T ca o 0 0 m i 3 _ 0 °o °o O 0 0• Q p .. : : : _ FE r w Z a 3 0 0 0 O r. - O 0 U - z z = U , _ w 3 - - x 9 z Z o o+ 3 O O O 8 2.", . . -. , 3 O' o - 0 ,,i O O W F' O g . o 7. s , y �I i u, 3 ` Fd- z w s o 00 o d p F r I 'o 5.' 0 r, C - c. 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Q 8 cs, N m W N M th N t7 S o CO O .1 VI 1A N Pi h N 0 Co (NO N > o 3 O O 4 p . O fV 0 A q �NQ cO� 8 8 W . 0 d V in . _ . J Z p A 4 W W CO P y 0 W N ooN toO O 7 e0 CO N O = U 2 j V' LL N l+) f7 m N N N N N Z • Sediment Basin DA 4 Sediment Basin Subca Reach -on. Link Routing Diagram for Sediment Basin Prepared by Microsoft, Printed 3/26/2014 HydroCAD®10.00 s!n 06538 ©2013 HydroCAD Software Solutions LLC Sediment Basin Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.020 79 <50%Grass cover, Poor, HSG B (1S) 1.260 98 impervious Area (1S) 3.280 86 TOTAL AREA Sediment Basin Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pace 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.020 HSG B 1S 0.000 HSG C 0.000 HSG D 1.260 Other 1S 3.280 TOTAL AREA Sediment Basin Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 2.020 0.000 0.000 0.000 2.020 <50%Grass cover, Poor 1S 0.000 0.000 0.000 0.000 1.260 1.260 Impervious Area 1S 0.000 2.020 0.000 0.000 1.260 3.280 TOTAL AREA Sediment Basin Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 4P 552.00 550.00 57.0 0.0351 0.025 24.0 0.0 0.0 Sediment Basin Type 1124-hr 2-Year Rainfal1=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 6 Time span=1.00-24.00 hrs,dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Sediment Basin DA Runoff Area=3.280 ac 38.41% Impervious Runoff Depth>2.54" Tc=12.0 min CN=86 Runoff=11.71 cfs 0.694 af Pond 4P: Sediment Basin Peak Elev=557.31' Storage=14,163 cf Inflow=11.71 cfs 0.694 af Outflow=4.93 cfs 0.532 af Total Runoff Area=3.280 ac Runoff Volume=0.694 af Average Runoff Depth=2.54" 61.59%Pervious=2.020 ac 38.41%Impervious=1.260 ac Sediment Basin Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 1S: Sediment Basin DA Runoff = 11.71 cfs @ 12.04 hrs, Volume= 0.694 af, Depth> 2.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 1.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description * 1.260 98 Impervious Area 2.020 79 <50%Grass cover, Poor, HSG B 3.280 86 Weighted Average 2.020 61.59% Pervious Area 1.260 38.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Subcatchment 1S: Sediment Basin DA Hydrograph // „ 13 D Runoff 12 1 11.71 cfs 1, Type II 24-h r 10= 2-Year Rainfall=4.04" 9 a Runoff Area=3.280 ac 8] ; Runoff Volume=0.694 af 7] Runoff Depth>2.54" 6- Tc=12.0 min 5 . CN=86 3- 2. �. 1 0 /////fl//..650""Ard/.0////1"Z.e)/�/�1//''/ .,.l//....____ /l//r 45, ziOJ/ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Pond 4P: Sediment Basin Inflow Area = 3.280 ac, 38.41%Impervious, Inflow Depth > 2.54" for 2-Year event Inflow = 11.71 cfs @ 12.04 hrs, Volume= 0.694 af Outflow = 4.93 cfs @ 12.21 hrs, Volume= 0.532 af, Atten=58%, Lag= 10.4 min Primary = 4.93 cfs @ 12.21 hrs, Volume= 0.532 af Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Peak Elev=557.31'@ 12.21 hrs Surf.Area= 5,181 sf Storage= 14,163 cf Plug-Flow detention time=226.5 min calculated for 0.530 af(76%of inflow) Center-of-Mass det.time= 139.7 min (953.7-814.1 ) Volume Invert AvaiI.Storage Storage Description #1 553.00' 31,519 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 553.00 1,473 0 0 554.00 2,292 1,883 1,883 555.00 3,136 2,714 4,597 556.00 4,005 3,571 8,167 557.00 4,900 4,453 12,620 558.00 5,819 5,360 17,979 559.00 6,764 6,292 24,271 560.00 7,733 7,249 31,519 Device Routing Invert Outlet Devices #1 Primary 552.00' 24.0" Round Culvert L= 57.0' Ke=0.500 Inlet/Outlet Invert= 552.00'/550.00' S=0.0351 '1' Cc= 0.900 n=0.025 Corrugated metal, Flow Area= 3.14 sf #2 Device 1 555.50' 4.0"Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 557.00' 30.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max--4.79 cfs @ 12.21 hrs HW=557.30' (Free Discharge) 'L1=Culvert (Passes 4.79 cfs of 28.57 cfs potential flow) 12--Orifice/Grate (Orifice Controls 0.56 cfs @ 6.46 fps) 3=Orifice/Grate (Weir Controls 4.22 cfs @ 1.79 fps) Sediment Basin Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 9 Pond 4P: Sediment Basin Hydrograph 0 Inflow 13: 11.71 cfs ( 0 Primary 12= Inflow Area=3.280 ac 11= Peak Elev=557.31' 1a Storage=14,163 cf 8 f, 73 o g� u. 4.93 cfs 3: s/ 2= /�. 1: i!//i4(0/./ A��/,-//.07://:•91./1/x✓✓,..ter% % .s//.//./, //./17:4 /. �.!' 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 cO 2013 HydroCAD Software Solutions LLC Page 10 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Sediment Basin DA Runoff Area=3.280 ac 38.41% Impervious Runoff Depth>4.40" Tc=12.0 min CN=86 Runoff=19.81 cfs 1.202 af Pond 4P: Sediment Basin Peak Elev=557.76' Storage=16,632 cf Inflow=19.81 cfs 1.202 af Outflow=17.78 cfs 1.008 af Total Runoff Area=3.280 ac Runoff Volume=1.202 af Average Runoff Depth=4.40" 61.59%Pervious=2.020 ac 38.41%Impervious=1.260 ac Sediment Basin Type 11 24-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pape 11 Summary for Subcatchment 1S: Sediment Basin DA Runoff = 19.81 cfs @ 12.03 hrs, Volume= 1.202 af, Depth> 4.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description * 1.260 98 Impervious Area 2.020 79 <50%Grass cover, Poor, HSG B 3.280 86 Weighted Average 2.020 61.59% Pervious Area 1.260 38.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Subcatchment 1S: Sediment Basin DA Hydrograph 22-/ ❑Runoff 21 1 19.81 cfs 1 20� , 19=a Type 1124-h r 1;^ 10-Year Rainfall=6.00" 16j Runoff Area=3.280 ac 15i 141 Runoff Volume=1.202 af 13� t 1Z=]- Runoff Depth>4A0" LL 10 Tc=12.0 min 9y 8- A¢ CN=86 7 . 57 3= . , � i .. ,. i . , /.iii r.,./ dedr..,131, %., 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hour) Sediment Basin Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 12 Summary for Pond 4P: Sediment Basin Inflow Area= 3.280 ac, 38.41% Impervious, Inflow Depth > 4.40" for 10-Year event Inflow = 19.81 cfs @ 12.03 hrs, Volume= 1.202 af Outflow = 17.78 cis @ 12.09 hrs, Volume= 1.008 af, Atten= 10%, Lag= 3.1 min Primary = 17.78 cfs @ 12.09 hrs, Volume= 1.008 af Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Peak Elev= 557.76'@ 12.09 hrs Surf.Area=5,602 sf Storage= 16,632 cf Plug-Flow detention time= 154.3 min calculated for 1.008 af(84%of inflow) Center-of-Mass det.time=84.4 min( 883.0-798.6 ) Volume Invert Avail.Storage Storage Description #1 553.00' 31,519 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area lnc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 553.00 1,473 0 0 554.00 2,292 1,883 1,883 555.00 3,136 2,714 4,597 556.00 4,005 3,571 8,167 557.00 4,900 4,453 12,620 558.00 5,819 5,360 17,979 559.00 6,764 6,292 24,271 560.00 7,733 7,249 31,519 Device Routing Invert Outlet Devices #1 Primary 552.00' 24.0" Round Culvert L= 57.0' Ke=0.500 Inlet/Outlet Invert= 552.00'/550.00' S=0.0351 'P Cc=0.900 n=0.025 Corrugated metal, Flow Area 3.14 sf #2 Device 1 555.50' 4.0"Horiz. Orifice/Grate C=0.600 Limited to weir flow at low heads #3 Device 1 557.00' 30.0"Horiz. Orifice/Grate C=0.600 Limited to weir flow at low heads Primary OutFlow Max=17.45 cis @ 12.09 hrs HW=557.75' (Free Discharge) '_1Culvert (Passes 17.45 cis of 29.77 cfs potential flow) -2=Orifice/Grate (Orifice Controls 0.63 cfs @ 7.23 fps) 3=Orifice/Grate (Weir Controls 16.81 cis @ 2.84 fps) Sediment Basin Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 13 Pond 4P: Sediment Basin Hydrograph /* ❑Inflow 22,-.... 19.81 cfs 21; 1 ❑Primary r Inflow Area=3.280 ac 19= 18a 17.78 r Peak Etev=,557.75' 16 Storage=16,632 cf 14= 3 ., 13' u 121 II 11 2 101 VI 87 0 7= 61 0 1 ,�Gr��',lrs,///,�/.0("%/.�/1,.r1/J//lam /•/i'i/'/./,///Y19.///rl /"://,,�.�/!./r 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 25-Year Rainfal1=7.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 14 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Sediment Basin DA Runoff Area=3.280 ac 38.41%Impervious Runoff Depth>5.35" Tc=12.0 min CN=86 Runoff=23.86 cfs 1.463 af Pond 4P: Sediment Basin Peak Elev=557.89' Storage=17,336 cf Inflow=23.86 cfs 1.463 af Outflow=22.16 cfs 1.252 af Total Runoff Area=3.280 ac Runoff Volume=1.463 af Average Runoff Depth=5.35" 61.59%Pervious=2.020 ac 38.41%Impervious=1.260 ac Sediment Basin Type 1124-hr 25-Year Rainfall=7.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment IS: Sediment Basin DA Runoff = 23.86 cfs @ 12.03 hrs, Volume= 1.463 af, Depth> 5.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs,dt=0.05 hrs Type II 24-hr 25-Year Rainfall=7.00" Area (ac) CN Description * 1.260 98 Impervious Area 2.020 79 <50%Grass cover, Poor, HSG B 3.280 86 Weighted Average 2.020 61.59% Pervious Area 1.260 38.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Subcatchment IS: Sediment Basin DA Hydrograph 26I D Runoff 2d= [ 23.86 cfs 227 Type 1124-hr 25-Year Rainfall=7.00" 20 t8a Runoff Area=3.280 ac 16 Runoff Volume=1.463 af 14= Runoff Depth?5.35" 12= Tc= 12.0 min CN=86 8- A 6 4. } 0 s/,s.,/.r.,r,,r���;erer,/./���,%r,••,i/• i�.1 3;re//.i,�11��.•�.t,//,�.,�,�.r��i// 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 11 24-hr 25-Year Rainfall=7.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 16 Summary for Pond 4P: Sediment Basin Inflow Area= 3.280 ac, 38.41%Impervious, Inflow Depth> 5.35" for 25-Year event Inflow = 23.86 cfs @ 12.03 hrs, Volume= 1.463 af Outflow = 22.16 cfs @ 12.07 hrs, Volume= 1.252 af, Atten= 7%, Lag= 2.4 min Primary = 22.16 cfs @ 12.07 hrs, Volume= 1.252 af Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Peak Elev= 557.89'@ 12.07 hrs Surf.Area=5,717 sf Storage= 17,336 cf Plug-Flow detention time= 134.7 min calculated for 1.249 af(85%of inflow) Center-of-Mass det. time= 70.4 min ( 863.6-793.2) Volume Invert Avail.Storage Storage Description #1 553.00' 31,519 cf Custom Stage Data(Prismatic)Listed below(Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 553.00 1,473 0 0 554.00 2,292 1,883 1,883 555.00 3,136 2,714 4,597 556.00 4,005 3,571 8,167 557.00 4,900 4,453 12,620 558.00 5,819 5,360 17,979 559.00 6,764 6,292 24,271 560.00 7,733 7,249 31,519 Device Routing Invert Outlet Devices #1 Primary 552.00' 24.0" Round Culvert L= 57.0' Ke=0.500 Inlet/Outlet Invert= 552.00'/550.00' S=0.0351 '/' Cc= 0.900 n=0.025 Corrugated metal, Flow Area= 3.14 sf #2 Device 1 555.50' 4.0"Horiz.Orifice/Grate C=0.600 Limited to weir flow at low heads #3 Device 1 557.00' 30.0"Horiz. Orifice/Grate C=0.600 Limited to weir flow at low heads Primary OutFlow Max=21.67 cfs @ 12.07 hrs HW=557.88' (Free Discharge) '_t=Culvert (Passes 21.67 cfs of 30.08 cfs potential flow) L2 Orific e/Grate (Orifice Controls 0.65 cfs @ 7.42 fps) 3=Orifice/Grate (Weir Controls 21.02 cfs @ 3.06 fps) Sediment Basin Type 1124-hr 25-Year Rainfall=7.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 17 Pond 4P: Sediment Basin Hydrograph Lir:Wiry 26 23.86 cfs 24= 22.16 Inflow Area=3.280 ac 22:4 PP Peak EIev=557.89' 20- 18- Storage=17,336 cf 16 141- a 12i 10= 0 g Tot, 4yv r f'jai,. 2' �.,.+r.�s✓✓r1Jf,..��.�r�.,��.r�r����'� �',,•,...•i,,�iiir��siiiiii497,i�iiiiii�iiiii%i,/r 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 50-Year Rainfall=8 00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 18 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Sediment Basin DA Runoff Area=3.280 ac 38.41%Impervious Runoff Depth>6.32" Tc=12.0 min CN=86 Runoff=27.89 cfs 1.727 af Pond 4P: Sediment Basin Peak EIev=558.04' Storage=18,197 cf Inflow=27.89 cfs 1.727 af Outflow=24.80 cfs 1.499 af Total Runoff Area=3.280 ac Runoff Volume=1.727 af Average Runoff Depth=6.32" 61.59%Pervious=2.020 ac 38.41%Impervious= 1.260 ac Sediment Basin Type 11 24-hr 50-Year Rainfall=8.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment 1S: Sediment Basin DA Runoff = 27.89 cfs @ 12.03 hrs, Volume= 1.727 af, Depth> 6.32" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 1.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 50-Year Rainfall=8.00" Area (ac) CN Description * 1.260 98 Impervious Area 2.020 79 <50%Grass cover, Poor, HSG B 3.280 86 Weighted Average 2.020 61.59% Pervious Area 1.260 38.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Subcatchment 1S: Sediment Basin DA Hydrograph 30- 0 Ru [ 27.89 cfs noff 28- 26• Type 1124-hr 24= ; 50-Year Rainfall=8.00" 22= Runoff Area-3,280 ac 20 Runoff Volume=1.727 af 161 Runoff Depth>6.32" 2 14= Tc=12.0 min 12- CN=86 10c 4;' rj 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 50-Year Rainfall=8.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 20 Summary for Pond 4P: Sediment Basin Inflow Area = 3.280 ac, 38.41% Impervious, Inflow Depth > 6.32" for 50-Year event Inflow = 27.89 cfs @ 12.03 hrs, Volume= 1.727 af Outflow = 24.80 cfs @ 12.08 hrs, Volume= 1.499 af, Atten= 11%, Lag= 2.9 min Primary = 24.80 cfs @ 12.08 hrs, Volume= 1.499 af Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Peak Elev=558.04'@ 12.08 hrs Surf.Area= 5,854 sf Storage= 18,197 cf Plug-Flow detention time= 121.6 min calculated for 1.499 af(87%of inflow) Center-of-Mass det.time=60.5 min (849.1 -788.6 ) Volume Invert Avail.Storage Storage Description #1 553.00' 31,519 cf Custom Stage Data(Prismatic) Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 553.00 1,473 0 0 554.00 2,292 1,883 1,883 555.00 3,136 2,714 4,597 556.00 4,005 3,571 8,167 557.00 4,900 4,453 12,620 558.00 5,819 5,360 17,979 559.00 6,764 6,292 24,271 560.00 7,733 7,249 31,519 Device Routing Invert Outlet Devices #1 Primary 552.00' 24.0" Round Culvert L= 57.0' Ke= 0.500 Inlet/Outlet Invert=552.00'/550.00' S=0.0351 '/' Cc=0.900 n= 0.025 Corrugated metal, Flow Area=3.14 sf #2 Device 1 555.50' 4.0"Horiz. Orifice/Grate C=0.600 Limited to weir flow at low heads #3 Device 1 557.00' 30.0"Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=24.53 cfs @ 12.08 hrs HW=558.02' (Free Discharge) L1Culvert (Passes 24.53 cfs of 30.45 cfs potential flow) L2=Orifice/Grate (Orifice Controls 0.67 cfs @ 7.64 fps) 3=Orifice/Grate (Orifice Controls 23.87 cfs @ 4.86 fps) Sediment Basin Type 1124-hr 50-Year Rainfall=8.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 21 Pond 4P: Sediment Basin Hydrograph Q 30-:: 27.89 cfs ! ❑Primary 28 r Inflow Area=3.280 ac 2s 24.80 cfs J Peak Elev=558.04' 24=- 22 Storage=18,197 cf 203 18 16 14; 107 6 1 2 /,, /rd,Y�+,�O.goidd,07./s,,yr.�✓rri/1< ` /1/ ��,s%.lirif�%4/0:01,17/77,20,.• o ccer//,/.��/..//��//,orsMr/1.,./�W�,r11.�r�'''` ..-//r//rr�.r�/. s,/, �/..ts,//�/ �/�., /"47- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 22 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Sediment Basin DA Runoff Area=3.280 ac 38.41% Impervious Runoff Depth>6.80" Tc=12.0 min CN=86 Runoff=29.90 cfs 1.859 af Pond 4P: Sediment Basin Peak EIev=558.13' Storage=18,770 cf Inflow=29.90 cfs 1.859 af Outflow=25.86 cfs 1.624 af Total Runoff Area=3.280 ac Runoff Volume=1.859 af Average Runoff Depth=6.80" 61.59%Pervious=2.020 ac 38.41%Impervious=1.260 ac Sediment Basin Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 1S: Sediment Basin DA Runoff = 29.90 cfs @ 12.03 hrs, Volume= 1.859 af, Depth> 6.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description * 1.260 98 Impervious Area 2.020 79 <50% Grass cover, Poor, HSG B 3.280 86 Weighted Average 2.020 61.59% Pervious Area 1.260 38.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.0 Direct Entry, Subcatchment 1S: Sediment Basin DA Hydrograph J [pate off 32 29.90 cfs 30= 26 Type 1124-hr 26= 100-Year Rainfa11=8.50" 24ir Runoff Area=3.280 ac 20~ Runoff Volume=1.859 af 164 Runoff Depth>6.80" g 14i Tc=12.0wirnin 121 CN=86 • •10= OrAs 13- ""grad744 s/7,/sir,.-'ice it,M∎ r%iiii.�.,o�..iii,�.�ii 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Sediment Basin Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 24 Summary for Pond 4P: Sediment Basin Inflow Area = 3.280 ac, 38.41%Impervious, Inflow Depth> 6.80" for 100-Year event Inflow = 29.90 cfs @ 12.03 hrs, Volume= 1.859 af Outflow = 25.86 cfs @ 12.09 hrs, Volume= 1.624 af, Atten= 14%, Lag= 3.3 min Primary = 25.86 cfs @ 12.09 hrs, Volume= 1.624 af Routing by Stor-Ind method, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Peak Elev= 558.13'@ 12.09 hrs Surf.Area=5,946 sf Storage= 18,770 cf Plug-Flow detention time= 116.0 min calculated for 1.624 af(87%of inflow) Center-of-Mass det.time=56.5 min( 843.1 -786.6 ) Volume Invert Avail.Storage Storage Description #1 553.00' 31,519 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 553.00 1,473 0 0 554.00 2,292 1,883 1,883 555.00 3,136 2,714 4,597 556.00 4,005 3,571 8,167 557.00 4,900 4,453 12,620 558.00 5,819 5,360 17,979, 559.00 6,764 6,292 24,271 560.00 7,733 7,249 31,519 Device Routing Invert Outlet Devices #1 Primary 552.00' 24.0" Round Culvert L=57.0' Ke=0.500 Inlet/Outlet Invert= 552.00'/550.00' S=0.0351 '/' Cc=0.900 n=0.025 Corrugated metal, Flow Area= 3.14 sf #2 Device 1 555.50' 4.0" Horiz.Orifice/Grate C=0.600 Limited to weir flow at low heads #3 Device 1 557.00' 30.0"Horiz. Orifice/Grate C=0.600 Limited to weir flow at low heads Primary OutFlow Max=25.68 cfs @ 12.09 hrs HW=558.12' (Free Discharge) 'L1�ulvert (Passes 25.68 cfs of 30.70 cfs potential flow) -2=Orifice/Grate (Orifice Controls 0.68 cfs @ 7.79 fps) 3=Orifice/Grate (Orifice Controls 25.00 cfs @ 5.09 fps) Sediment Basin Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 25 Pond 4P: Sediment Basin / Hydrograph ❑inflow 1 29.90 cfs ,p Primary 30= r Inflow Area=3.280 ac 2a' 1 25.86 cfs I Peak Elea=558.13' 26 24' Storage=18,770 cf 22a Il 20= u 18i 164 t u. 14 12 10 6 1 2a i.�r.1.r�rr,!.fss%r�.,,��,r�J,�i�,iri.�i�r�/r�i/ t!j4/Rio,,,∎.∎-,sir,,•ez4t. 047.1,/11,. /.eff #0:i.�. 2e7. Y; 0 5%//i,°77. ///////////.ice/l///J..///Jf1/e4 /f'��'f`///l/J////,�///�//////r////„%r////1f/ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) North Developed Subcat Reath -on. Link Routing Diagram for Pre North SCS Prepared by Microsoft, Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pre North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 4.590 61 >75% Grass cover, Good, HSG B (2S) 1.100 98 Paved parking, HSG B (2S) 5.690 68 TOTAL AREA Pre North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Pace 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 5.690 HSG B 2S 0.000 HSG C 0.000 HSG D 0.000 Other 5.690 TOTAL AREA Pre North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 4.590 0.000 0.000 0.000 4.590 >75%Grass cover, Good 2S 0.000 1.100 0.000 0.000 0.000 1.100 Paved parking 2S 0.000 5.690 0.000 0.000 0.000 5.690 TOTAL AREA Pre North SCS Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 5 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: North Pre Developed Runoff Area=5.690 ac 19.33% Impervious Runoff Depth>1.20" Tc=13.1 min CN=68 Runoff=8.96 cfs 0.569 af Total Runoff Area=5.690 ac Runoff Volume=0.569 af Average Runoff Depth =1.20" 80.67% Pervious=4.590 ac 19.33%Impervious=1.100 ac Pre North SCS Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 2S: North Pre Developed Runoff = 8.96 cfs @ 12.06 hrs, Volume= 0.569 af, Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 1.100 98 Paved parking, HSG B 4.590 61 >75% Grass cover, Good, HSG B 5.690 68 Weighted Average 4.590 80.67% Pervious Area 1.100 19.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 2S: North Pre Developed Hydrograph ❑Runoff 9 (amt Type 1124-hr 6 2-Year Rainfall=4.O0" Runoff Area=5m690 ac 6_ Runoff Volume=0.569 of Runoff Depth>1,2O 5 � LL TC=13,1 min 4- CN-fib 2- ream mom rareftroforeem/ / r, Ate,/ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17-18 19 20 21 22 23 24 Time (hours) Pre North SCS Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pace 7 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: North Pre Developed Runoff Area=5.690 ac 19.33% Impervious Runoff Depth>2.61" Tc=13.1 min CN=68 Runoff=20.34 cfs 1.238 of Total Runoff Area=5.690 ac Runoff Volume= 1.238 of Average Runoff Depth =2.61" 80.67%Pervious=4.590 ac 19.33%Impervious=1.100 ac Pre North SCS Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 2S: North Pre Developed Runoff = 20.34 cfs @ 12.05 hrs, Volume= 1.238 af, Depth> 2.61" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description 1.100 98 Paved parking, HSG B 4.590 61 >75% Grass cover, Good, HSG B 5.690 68 Weighted Average 4.590 80.67% Pervious Area 1.100 19.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 2S: North Pre Developed Hydrograph 22: ❑Runoff 21 12434col 20_ Type 1124-hr 19:. t�pq 18 10-Year Rainfall=6 00" 17- 16- Runoff Area=5.690 ac 15 14 Runoff Votume°#" .23g 8 af 4-F 13 12 Runoff Depth>2.6 q i a' • 11 - ie=13.I miff O g LT io e / C =68 7 4 2 ` rr 416 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre North SCS Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 9 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: North Pre Developed Runoff Area=5.690 ac 19.33% Impervious Runoff Depth>4.64" Tc=13.1 min CN=68 Runoff=36.28 cfs 2.202 af Total Runoff Area=5.690 ac Runoff Volume=2.202 af Average Runoff Depth =4.64" 80.67%Pervious =4.590 ac 19.33%Impervious=1.100 ac Pre North SCS Type I124-hr 100-Year Rainfal1=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD 6010.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 2S: North Pre Developed Runoff = 36.28 cfs @ 12.05 hrs, Volume= 2.202 af, Depth> 4.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 1.100 98 Paved parking, HSG B 4.590 61 >75% Grass cover, Good, HSG B 5.690 68 Weighted Average 4.590 80.67% Pervious Area 1.100 19.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 2S: North Pre Developed Hydrograph 40 ❑Runoff 38 13e.20 co. 36 Type 1124-hr 34 Yp 100-Year Rainfa11=8.50" 30- 28° Runoff Area=5.090 ac 26 Runoff Volume=2,202 of .. 24 22 Runoff Depth>4.64" LL 18- Tc=13.1 320.v 16 14 CN=68 - 12 I 10 2 /FI ,10 TrTTTT .-'-s+-+-- . . r+ Tr�-mrt s 19 . .. .. .:.. .. 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 20 21 22 23 24 Time (hours) 9S Uper nd Pre Dev loped <8S> Lower Pond Pre /3F:\ Developed NE Upp r Pond Lower Pond Pre �P Developed SW Lower Pond Subca Reach o • Link Routing Diagram for Pre Developed Ponds Prepared by Microsoft, Printed 3/26/2014 HydroCAD8 10.00 sin 06538 @ 2013 HydroCAD Software Solutions LLC Pre Developed Ponds Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 12.540 61 >75%Grass cover,Good, HSG B (5S,8S,9S) 3.550 98 Paved parking, HSG B (8S,9S) 16.090 69 TOTAL AREA Pre Developed Ponds Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 16.090 HSG B 5S,8S,9S 0.000 HSG C 0.000 HSG D 0.000 Other 16.090 TOTAL AREA Pre Developed Ponds Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 12.540 0.000 0.000 0.000 12.540 >75%Grass cover,Good 5S,8S,9S 0.000 3.550 0.000 0.000 0.000 3.550 Paved parking 8S,9S 0.000 16.090 0.000 0.000 0.000 16.090 TOTAL AREA Pre Developed Ponds Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 5, Pipe Listing(all nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 3P 523.17 519.10 84.7 0.0481 0.013 12.0 0.0 0.0 2 4P 512.06 511.06 100.0 0.0100 0.013 24.0 0.0 0.0 Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00%Impervious Runoff Depth>0.81" Tc=17.2 min CN=61 Runoff=0.66 cfs 0.054 af Subcatchment 8S: Lower Pond Pre Developed Runoff Area=2.140 ac 45.33%Impervious Runoff Depth>1.88" Tc=6.6 min CN=78 Runoff=7.07 cfs 0.336 af Subcatchment 9S: Uper Pond Pre Developed Runoff Area=13.140 ac 19.63%Impervious Runoff Depth>1.20" Tc=18.0 min CN=68 Runoff=17.53 cfs 1.311 af Pond 3P: Upper Pond Peak Elev=527.97' Storage=7,629 cf Inflow=17.53 cfs 1.311 af Outflow=9.00 cfs 1.311 af Pond 4P: Lower Pond Peak Elev=513.76' Storage=118 cf Inflow=13.57 cfs 1.701 af 24.0" Round Culvert n=0.013 L=100.0' S=0.0100'P Outflow=13.56 cfs 1.701 af Total Runoff Area=16.090 ac Runoff Volume=1.701 af Average Runoff Depth=1.27" 77.94%Pervious=12.540 ac 22.06%Impervious=3.550 ac Pre Developed Ponds Type II 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC PaQe 7 Summary for Subcatchment 5S: Lower Pond Pre Developed SW Runoff = 0.66 cfs @ 12.12 hrs, Volume= 0.054 af, Depth> 0.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area(ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph ❑Runoff 0.7= 1 0.66 cfs l 0.65 Type II 24-hr +I °.6 2-Year Rainfall=4.00" 0.55- Runoff Area=0.810 ac l 0.5 0 0.45 Runoff Volume=0.054 af 0.4 Runoff Depth>0.81'' LL o.3s Tc=17.2 min r 0.3 0.25 CN=61 j 0.05' , 0.05 1 • `/.17" "�i�/�J�.��.r��i�//ij.���Ii�./��i� 0 "i��.Ii .././J���fi•71:0�.I/!1///If/J%I/rs/,//.1.////.//s//!/i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 8S: Lower Pond Pre Developed NE Runoff = 7.07 cfs @ 11.98 hrs, Volume= 0.336 af, Depth> 1.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 0.970 98 Paved parking, HSG B 1.170 61 >75%Grass cover, Good, HSG B 2.140 78 Weighted Average 1.170 54.67%Pervious Area 0.970 45.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Pre Developed NE Hydrograph ❑Runoff 7.07 cfs I 7- Type H 24-hr 2-Year Rainfall=4.00" Runoff Area=2.140 ac 5, I� Runoff Volume--0.336 af { 4� Runoff Depth>1.88" Tc=6.6 min CN=78 % •/./r/r1/,•/�.//. .f.// r ' z/," o 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 9S: Uper Pond Pre Developed Runoff = 17.53 cfs @ 12.12 hrs, Volume= 1.311 af, Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 2.580 98 Paved parking, HSG B 10.560 61 >75%Grass cover, Good, HSG B 13.140 68 Weighted Average 10.560 80.37% Pervious Area 2.580 19.63% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 9S: Uper Pond Pre Developed Hydrograph 194 ❑Runoff 18- 17.53 cfs 17= Type 1124-hr 16; 15 2-Year Rainfall=4.00" �0 13 Runoff Area=13.140 ac 12J Runoff Volume=1.311 af ;off Runoff Depth>1.20" Tc=18.0 min 0 7- GN=68 0 Terse/1/./,////////.//,/.,//f///.//.s.01Xer./".//J .1 1 101///,r/ff! .1///rte/r/efr/"1/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 10 Summary for Pond 3P: Upper Pond Inflow Area= 13.140 ac, 19.63%Impervious, Inflow Depth > 1.20" for 2-Year event Inflow = 17.53 cfs @ 12.12 hrs, Volume= 1.311 af Outflow = 9.00 cfs @ 12.31 hrs, Volume= 1.311 af, Atten=49%, Lag= 11.4 min Primary = 9.00 cfs @ 12.31 hrs, Volume= 1.311 af Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.01 hrs Peak Elev=527.97'@ 12.31 hrs Surf.Area=4,184 sf Storage= 7,629 cf Plug-Flow detention time 4.4 min calculated for 1.310 of(100%of inflow) Center-of-Mass det.time=4.3 min( 875.0-870.7) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic) Listed below (Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L= 84.7' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'/519.10' S=0.0481 '/' Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area 0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width (feet) 5.00 15.00 30.00 Primary OutFlow Max=9.00 cfs @ 12.31 hrs HW=527.9T TW=513.48' (Dynamic Tailwater) t1=Culvert (Barrel Controls 9.00 cfs @ 11.46 fps) 2=Custom Weir/Orifice ( Controls 0.00 cfs) Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 11 Pond 3P: Upper Pond Hydrograph ❑inflow 19= 17.53 cfs ❑Primary 18i Inflow Area=13.140 ac ;s' Peak EIev=527.97' t5 14-j Storage-n:7,629 cf '/ 13? l) 12 11--;1 0 9.00 cfs g 5• ; % 3 i��fi��o%iirii�ieiiiii0:01,iii ` 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 11 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 12 Summary for Pond 4P: Lower Pond Inflow Area = 16.090 ac, 22.06% Impervious, Inflow Depth > 1.27" for 2-Year event Inflow = 13.57 cfs @ 12.01 hrs, Volume= 1.701 af Outflow = 13.56 cfs @ 12.01 hrs, Volume= 1.701 af, Atten=0%, Lag=0.3 min Primary = 13.56 cfs @ 12.01 hrs, Volume= 1.701 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs,dt=0.01 hrs Peak Elev=513.76'@ 12.01 hrs Surf.Area= 198 sf Storage= 118 cf Plug-Flow detention time=0.1 min calculated for 1.701 af(100%of inflow) Center-of-Mass det.time=0.1 min (867.6-867.5 ) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert= 512.06'/511.06' S=0.0100'/' Cc= 0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 3.14 sf Primary OutFlow Max=13.55 cfs @ 12.01 hrs HW=513.76' (Free Discharge) t-1=Culvert (Barrel Controls 13.55 cfs @ 6.40 fps) Pre Developed Ponds Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pace 13 Pond 4P: Lower Pond Hydrograph ❑15-' ,#�a /� i 13.57 n 14= Inflow Area= 1.6.09 .13.5�� ,2 Peak Elev=513.76' S%! 11 Storage=118 cf ' 10 2401 j 8- Round Culvert /, — 1 n=0.013 '4, 5 L=100.0' ,%� 4= S=0.01006/1 y%0 3 jo���°l.,/11.0,�I I 7���i,� '°./.ors,.'��,,,..r,..%�eoe./.rZfs��/W,,97� 1' -.%�., /...,/.r../.,MWit:.,:�.'.%,%,4e!e./. r/0,% ' /i//.om m..r.�'/..si,�I.in�i111ii/.�/� IN 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCADO 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 14 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00% Impervious Runoff Depth>1.99" Tc=17.2 min CN=61 Runoff=1.89 cfs 0.135 af Subcatchment 8S: Lower Pond Pre Developed Runoff Area=2.140 ac 45.33% Impervious Runoff Depth>3.57" Tc=6.6 min CN=78 Runoff=13.20 cfs 0.637 af Subcatchment 9S: Uper Pond Pre Developed Runoff Area=13.140 ac 19.63% Impervious Runoff Depth>2.61" Tc=18.0 min CN=68 Runoff=40.30 cfs 2.855 af Pond 3P: Upper Pond Peak Elev=531.79' Storage=33,164 cf Inflow=40.30 cfs 2.855 af Outflow=10.97 cfs 2.854 af Pond 4P: Lower Pond Peak Elev=514.83' Storage=728 cf Inflow=22.91 cfs 3.626 af 24.0" Round Culvert n=0.013 1=100.0' S=0.0100'/' Outflow=21.43 cfs 3.626 af Total Runoff Area=16.090 ac Runoff Volume=3.626 af Average Runoff Depth=2.70" 77.94%Pervious=12.540 ac 22.06%Impervious=3.550 ac Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD k®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 5S: Lower Pond Pre Developed SW Runoff = 1.89 cfs @ 12.10 hrs, Volume= 0.135 af, Depth> 1.99" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph ❑Runoff 2- ( 1.89 cfs I Type II 24-hr 10-Year Rainfall=6.00" Runoff Area=0.810 act Runoff Volume=0.135 af Runoff Depth>1.99" Tc=17.2 min CN=61 % rf 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 8S: Lower Pond Pre Developed NE Runoff = 13.20 cfs @ 11.98 hrs, Volume= 0.637 at Depth> 3.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description 0.970 98 Paved parking, HSG B 1.170 61 >75%Grass cover, Good, HSG B 2.140 78 Weighted Average 1.170 54.67% Pervious Area 0.970 45.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Pre Developed NE Hydrograph 14-" 13.20 cfs ❑Run off 13- Type 11 24-hr t2' 10 10-Year Rainfall=6.00" i& Runoff Area=2.140 ac 9� 0 Runoff Volume=0.637 af 8- Depth>3.57" LL �0 TC=sus min 6- � 53 0 CN=78 3_1 2:3 % 0 /PM 1, .e../, to fff"i .,,/!/./2:41 MIN°. y/i, �.r/,srfa/�i/X/' ..�Zrs.'/.'dr�,•// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type II 24-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 9S: Uper Pond Pre Developed Runoff = 40.30 cfs @ 12.10 hrs, Volume= 2.855 af, Depth> 2.61" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area(ac) CN Description 2.580 98 Paved parking, HSG B 10.560 61 >75%Grass cover, Good, HSG B 13.140 68 Weighted Average 10.560 80.37% Pervious Area 2.580 19.63% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 9S: Uper Pond Pre Developed Hydrograph 44 j Runoff 42= , 40.30 cfs Type 1124-h r 36 10-Year Rainfall=6.00" 34 32i Runoff Area=13.140 ac 30 8 Runoff Volume=2.855 af 24= Runoff Depth>2.61" i 10 20+ Tc=18.0 min ,8- CN*68 14= 12= 18 6. .,'*AO 2 .�1�.r.���i��r..�o..Ire..f�,ezez��.ftzeo./i-,fr 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 18 Summary for Pond 3P: Upper Pond Inflow Area = 13.140 ac, 19.63% Impervious, Inflow Depth> 2.61" for 10-Year event Inflow = 40.30 cfs @ 12.10 hrs, Volume= 2.855 af Outflow = 10.97 cfs @ 12.46 hrs, Volume= 2.854 af, Atten=73%, Lag=21.4 min Primary = 10.97 cfs @ 12.46 hrs, Volume= 2.854 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs,dt=0.01 hrs Peak Elev=531.79'@ 12.46 hrs Surf.Area= 9,282 sf Storage=33,164 cf Plug-Flow detention time= 19.7 min calculated for 2.853 af(100%of inflow) Center-of-Mass det.time= 19.6 min (867.2-847.6) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic)Listed below (Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L=84.7' RCP,groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'/519.10' S=0.0481 'I' Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area=0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width(feet) 5.00 15.00 30.00 Primary OutFlow Max=10.97 cfs @ 12.46 hrs HW=531.79' TW=513.69' (Dynamic Tailwater) -1=Culvert (Barrel Controls 10.97 cfs @ 13.97 fps) 2=Custom Weir/Orifice ( Controls 0.00 cfs) Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Paae 19 Pond 3P: Upper Pond Hydrograph ❑44+ 1 40.30 cfs ry 421 Inflow Area=13.140 ac 38 A 3641 Peak Elev531..79 34 � . 32 Storage=33,164 cf ' 30' 28= � w264 • 2, 24- g22- u. 20; 04 184 46= 141 1 10.97 cfs 10'- ,' "ZOO.tr...1.��,/,�O77/4..rAKAA77.4l/7,Mt/r;,/ //i:.4.'0.r.//r,4 55/o.,0///./,//i,,/�/..c.�,/o!////fir/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pape 20 Summary for Pond 4P: Lower Pond Inflow Area = 16.090 ac, 22.06% Impervious, Inflow Depth > 2.70" for 10-Year event Inflow = 22.91 cfs @ 11.99 hrs, Volume= 3.626 af Outflow = 21.43 cfs @ 12.03 hrs, Volume= 3.626 af, Atten=6%, Lag=2.3 min Primary = 21.43 cfs @ 12.03 hrs, Volume= 3.626 af Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.01 hrs Peak Elev= 514.83'@ 12.03 hrs Surf.Area= 1,104 sf Storage=728 cf Plug-Flow detention time=0.1 min calculated for 3.626 af(100%of inflow) Center-of-Mass det.time=0.1 min( 858.2-858.0 ) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic)Listed below(Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP, groove end projecting, Ke=0.200 inlet!Outlet Invert= 512.06'/511.06' S=0.0100'/' Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 3.14 sf Primary OutFlow Max=21.42 cfs @ 12.03 hrs HW=514.83' (Free Discharge) 'L1Culvert (Barrel Controls 21.42 cfs @ 6.82 fps) Pre Developed Ponds Type I124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 21 Pond 4P: Lower Pond Hydrograph ,/ ❑. i 22.91 cfs I ❑ 24:' MA Inflow Area=16.090 ac t 21.43 cfs ' 20= A Peak Elev=514,83' ,S� of/ storage=728 cf 16- 10/ 24.0" 14- �,' Round Culvert fj° 'LL ,2- �r� n=0.013 ' y / L= 100.0' 8 . /j 1 s=0.0100 'r 4; / "47/".40:4,05,00z,.ate/..4//////J// Af..i7.417 /.///J///�////�" '11`.'� ..r/i/iJ%%iif%riiiiiiiif 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 22 Time span=0.00-24.00 hrs,dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00% Impervious Runoff Depth>3.81" Tc=17.2 min CN=61 Runoff=3.73 cfs 0.257 af Subcatchment 8S: Lower Pond Pre Developed Runoff Area=2.140 ac 45.33% Impervious Runoff Depth>5.85" Tc=6.6 min CN=78 Runoff=21.09 cfs 1.043 af Subcatchment 9S: Uper Pond Pre Developed Runoff Area=13.140 ac 19.63% Impervious Runoff Depth>4.64" Tc=18.0 min CN=68 Runoff=72.36 cfs 5.077 af Pond 3P: Upper Pond Peak Elev=534.45' Storage=63,337 cf Inflow=72.36 cfs 5.077 af Outflow=34.59 cfs 5.077 af Pond 4P: Lower Pond Peak EIev=516.98' Storage=4,978 cf Inflow=38.82 cfs 6.377 af 24.0" Round Culvert n=0.013 L=100.0' S=0.0100'/' Outflow=31.91 cfs 6.376 af Total Runoff Area=16.090 ac Runoff Volume=6.377 af Average Runoff Depth =4.76" 77.94%Pervious=12.540 ac 22.06%Impervious=3.550 ac Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 5S: Lower Pond Pre Developed SW Runoff = 3.73 cfs @ 12.10 hrs, Volume= 0.257 af, Depth> 3.81" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph / ❑Runoff 4- 1 3.73 cfs Type II 24-hr 100-Year Rainfall=8.50" 1 31 Runoff Area=0.810 ac Runoff Volume=0.257 af i0 2 Runoff Depth>3.81" LL Tc=17.2 min r� CN=61 rj ,4 f% o ..iriei7 .64si/zArrir�/z/zzerrf�. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pape 24 Summary for Subcatchment 8S: Lower Pond Pre Developed NE Runoff = 21.09 cfs @ 11.98 hrs, Volume= 1.043 af, Depth> 5.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 0.970 98 Paved parking, HSG B 1.170 61 >75% Grass cover, Good, HSG B 2.140 78 Weighted Average 1.170 54.67% Pervious Area 0.970 45.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Pre Developed NE Hydrograph 23 ! ❑Runoff 22 21.09 cfs 2' Type II 24-hr 20 '94 P 100-Year Rainfall=8.50" 18LL 17' Runoff Area=2.140 ac 16ti 15y Runoff Volume=1.043 af 14=" 12- 0 Runoff Depth>5.85" o 11 0 Tc=66 min g. CN=78 7i 5 tkoff/ 3 j •II∎nisi, i..tereii,. rr.••.�.000: r..0.irr.,�� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 9S: Uper Pond Pre Developed Runoff = 72.36 cfs @ 12.10 hrs, Volume= 5.077 af, Depth> 4.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 2.580 98 Paved parking, HSG B 10.560 61 >75%Grass cover, Good, HSG B 13.140 68 Weighted Average 10.560 80.37% Pervious Area 2.580 19.63% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 9S: Uper Pond Pre Developed Hydrograph 80 41:110.11 751 72.36 cfs I 70= Type 11 24-hr 65? 1.00-Year Rainfall=8.50" 551 Runoff Area=13.140 ac i� 50- Runoff Volume=5.077 af iP 45= Runoff Depth>4.64" 2 243°-5.; Tc=18.0 min 0� 30 C N=68 20 257, Pf 10 ���� 0 /✓.zesz,,.•J,///.�1,.�r.-my;e./�o,�,.��,�r.4or�'/���` `�i/ir/./lsr//,�s.fie%%��r�e���/��rrsf�/.,,/'. r,.,.,,,•.r,..rte,T, _..,,. .,,., 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 26 Summary for Pond 3P: Upper Pond Inflow Area= 13.140 ac, 19.63% Impervious, Inflow Depth > 4.64" for 100-Year event Inflow = 72.36 cfs @ 12.10 hrs, Volume= 5.077 af Outflow = 34.59 cfs @ 12.30 hrs, Volume= 5.077 af, Atten=52%, Lag= 12.1 min Primary = 34.59 cfs @ 12.30 hrs, Volume= 5.077 af Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.01 hrs Peak Elev= 534.45'@ 12.30 hrs Surf.Area= 12,894 sf Storage=63,337 cf Plug-Flow detention time=31.4 min calculated for 5.077 af(100%of inflow) Center-of-Mass det.time 31.4 min( 862.7-831.4) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic)Listed below (Recalc) Elevation Surf.Area tnc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L=84.7' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'/519.10' S= 0.0481 '/' Cc= 0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width(feet) 5.00 15.00 30.00 Primary OutFlow Max=34.55 cfs @ 12.30 hrs HW=534.45' •TW=516.35' (Dynamic Tailwater) -1�ulvert (Barrel Controls 12.15 cfs @ 15.47 fps) 2 Custom Weir/Orifice (Weir Controls 22.40 cfs @ 2.42 fps) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 27 Pond 3P: Upper Pond Hydrograph ❑Inflow 80- • 1 72.36 cfs ❑Primary 75'; Inflow .Area-13.140 ac, 65= Peak Elev=534:45' E! 60" ,00 Storage=63,337 cf g 55; " f' 50=' Al 45; 40 ( 34.59 cfs 12 30= 25'J 20-. 5 0'/zee/,/////.'O.�1f/.fr°- 7/z.//.///.�w> ••/ //✓✓.%//..7ze,��//..�!'.�.�.1J'�,✓///Y.y!/��:''�iy• 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Developed Ponds Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 28 Summary for Pond 4P: Lower Pond Inflow Area= 16.090 ac, 22.06%Impervious, Inflow Depth> 4.76" for 100-Year event Inflow = 38.82 cfs @ 12.30 hrs, Volume= 6.377 af Outflow = 31.91 cfs @ 12.40 hrs, Volume= 6.376 af, Atten= 18%, Lag=5.8 min Primary = 31.91 cfs @ 12.40 hrs, Volume= 6.376 af Routing by Dyn-Stor-Ind method,Time Span=0.00-24.00 hrs, dt= 0.01 hrs Peak Elev=516.98'@ 12.40 hrs Surf.Area= 2,781 sf Storage=4,978 cf Plug-Flow detention time= 0.5 min calculated for 6.374 af(100%of inflow) Center-of-Mass det.time= 0.5 min (852.5-852.0) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert=512.06'/511.06' S=0.0100'P Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 3.14 sf Primary OutFlow Max=31.91 cfs @ 12.40 hrs HW=516.98' (Free Discharge) t1=Culvert (Barrel Controls 31.91 cfs @ 10.16 fps) Pre Developed Ponds Type II 24-hr 100-Year Rainfall=8 50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 29 Pond 4P: Lower Pond Hydrograph / , ❑Inflow 42=- 38.82 cfs 1 p primary I 4° Inflow Area=16.090 ac 381 36= Peak Elev=516.98' 3,.9, 324 Storage=4,978 of d 28 26 24.0.. 22' Round Culvert %%: 1203 n-0.01 3 fy 161 L=100.0' �`.rs®�, • ;4 S=0.0100 '1' ���; ��f'''��f 21 „-sr,�s,%rrorr��i��.rr.,r..,f�.{�iiiii' , ..�.. ,,%�rr..�.,r,%d.�, :zze.%rr,%s..rw 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ( s ) North Subcat Reach on Link! Routing Diagram for Post North SCS Prepared by Microsoft, Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Post North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.380 61 >75%Grass cover,Good, HSG B (1S) 1.520 98 Impervious Area (1S) 3.900 75 TOTAL AREA Post North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 2.380 HSG B 1S 0.000 HSG C 0.000 HSG D 1.520 Other 1S 3.900 TOTAL AREA Post North SCS Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 2.380 0.000 0.000 0.000 2.380 >75% Grass cover, Good 1S 0.000 0.000 0.000 0.000 1.520 1.520 Impervious Area IS 0.000 2.380 0.000 0.000 1.520 3.900 TOTAL AREA Post North SCS Type 11 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 5 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment IS: North Post Developed Runoff Area=3.900 ac 38.97% Impervious Runoff Depth>1.66" Tc=13.1 min CN=75 Runoff=8.84 cfs 0.540 of Total Runoff Area=3.900 ac Runoff Volume=0.540 of Average Runoff Depth = 1.66" 61.03% Pervious=2.380 ac 38.97%Impervious=1.520 ac Post North SCS Type 1124-hr 2-Year Rainfal1=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: North Post Developed Runoff = 8.84 cfs @ 12.06 hrs, Volume= 0.540 af, Depth> 1.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description * 1.520 98 Impervious Area 2.380 61 >75% Grass cover, Good, HSG B 3.900 75 Weighted Average 2.380 61.03% Pervious Area 1.520 38.97% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 1S: North Post Developed Hydrograph ❑Runoff 9 (884als1 Type 1124-hr 2-Year Rainfall=4.00" 7 Runoff Area=3.900 ac 6 Runoff Volume=0.540 af 5 Runoff Depth>1.66" Tc=13;1 min 4 CN=75 3 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post North SCS Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 7 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: North Post Developed Runoff Area=3.900 ac 38.97% Impervious Runoff Depth>3.27" Tc=13.1 min CN=75 Runoff=17.52 cfs 1.063 af Total Runoff Area=3.900 ac Runoff Volume= 1.063 af Average Runoff Depth =3.27" 61.03%Pervious=2.380 ac 38.97%Impervious=1.520 ac Post North SCS Type 11 24-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment "1 S: North Post Developed Runoff = 17.52 cfs @ 12.05 hrs, Volume= 1.063 af, Depth> 3.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description * 1.520 98 Impervious Area 2.380 61 >75% Grass cover, Good, HSG B 3.900 75 Weighted Average 2.380 61.03% Pervious Area 1.520 38.97% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 1 S: North Post Developed Hydrograph 19 i. ❑Runoff 18 ,752d.1 17 Type II 24-hr 16 10 -Year=Yea r Rainfaltr-6.001a 14 Runoff Area=3.900 ac 13 t2 Runoff Volume=1.063 af ,o Runoff Depth>3.27" 0 9° 1c=13.1 nin 8 7 CN=75 6. 5 4' 3- 2 { i i, ' 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post North SCS Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pape 9 Time span=1.00-24.00 hrs, dt=0.05 hrs, 461 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: North Post Developed Runoff Area=3.900 ac 38.97% Impervious Runoff Depth>5.48" Tc=13.1 min CN=75 Runoff=29.01 cfs 1.781 af Total Runoff Area=3.900 ac Runoff Volume=1.781 af Average Runoff Depth =5.48" 61.03%Pervious=2.380 ac 38.97%Impervious=1.520 ac Post North SCS Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD® 10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment IS: North Post Developed Runoff = 29.01 cfs @ 12.05 hrs, Volume= 1.781 af, Depth> 5.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 1.00-24.00 hrs, dt=0.05 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 1.520 98 Impervious Area 2.380 61 >75% Grass cover, Good, HSG B 3.900 75 Weighted Average 2.380 61.03% Pervious Area 1.520 38.97% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment IS: North Post Developed Hydrograph 32 ❑Runoff 30 129.01 d. 28 Type 1124-hr 1 3 100-Year Reinfalh8;5O" 24 Runoff Area=3,900 ac 22 20 Runoff Volume=1,781 af 18 Runoff Depth>5.48" 16- 14 Tc=13.1 min 12 CN=7'5 10; 8 2= 1 2 3 4 5 6 7 8 9 —10-1'1— 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 0 10S Uper Po Post Develo ed North ea I To Upper Pond (7S> $S North Area 2 To Upper Lower Pond ost 3P Pond Developed N peer Pond 0 p A Lower Pond Pre Lower Pond Developed SW (Subca) Reach •o • Routing Diagram for POST Developed Ponds with riser Prepared by Microsoft, Printed 3/26/2014 HydroCAD®10.00 sin 06538 ®2013 HydroCAD Software Solutions LLC POST Developed Ponds with riser Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 13.870 61 >75%Grass cover, Good, HSG B (5S, 7S,8S, 10S, 12S) 4.120 98 Paved parking, HSG B (7S,8S, 10S, 12S) 17.990 69 TOTAL AREA POST Developed Ponds with riser Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Sal Subcatchment (acres) Group Numbers 0.000 HSG A 17.990 HSG B 5S, 7S,8S, 10S, 12S 0.000 HSG C 0.000 HSG D 0.000 Other 17.990 TOTAL AREA POST Developed Ponds with riser Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 13.870 0.000 0.000 0.000 13.870 >75%Grass cover, Good 5S,7S,8S, 10S, 12S 0.000 4.120 0.000 0.000 0.000 4.120 Paved parking 7S, 8S, 10S, 12S 0.000 17.990 0.000 0.000 0.000 17.990 TOTAL AREA POST Developed Ponds with riser Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 3P 523.17 519.10 84.7 0.0481 0.013 12.0 0.0 0.0 2 4P 512.06 511.06 100.0 0.0100 0.013 24.0 0.0 0.0 POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00%Impervious Runoff Depth>0.81" Tc=17.2 min CN 61 Runoff=0.66 cfs 0.054 af Subcatchment 7S: North Area 2 To Upper Pond Runoff Area=0.110 ac 81.82% Impervious Runoff Depth>3.01" Tc=5.0 min CN=91 Runoff=0.58 cfs 0.028 af Subcatchment 8S: Lower Pond Post Developed Runoff Area=2.030 ac 42.86%Impervious Runoff Depth>1.81" Tc=6.6 min CN=77 Runoff=6.44 cfs 0.306 af Subcatchment 10S: North Area 1 To Upper Runoff Area=1.790 ac 26.82% Impervious Runoff Depth>1.39" Tc=13.1 min CN=71 Runoff=3.37 cfs 0.207 af Subcatchment 12S: Uper Pond Post DevelopedRunoff Area=13.250 ac 20.23%Impervious Runoff Depth>1.20" Tc=18.0 min CN=68 Runoff=17.68 cfs 1.322 af Pond 3P: Upper Pond Peak EIev=529.09' Storage=13.169 cf Inflow=20.79 cfs 1.557 af Outflow=8.10 cfs 1.557 af Pond 4P: Lower Pond Peak Elev=513.65' Storage=97 cf Inflow=12.26 cfs 1.917 af 24.0" Round Culvert n=0.013 L=100.0' S=0.0100'/' Outflow=12.25 cfs 1.917 af Total Runoff Area=17.990 ac Runoff Volume=1.917 af Average Runoff Depth=1.28" 77.10%Pervious=13.870 ac 22.90%Impervious=4.120 ac POST Developed Ponds with riser Type 11 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 5S: Lower Pond Pre Developed SW Runoff = 0.66 cfs @ 12.12 hrs, Volume= 0.054 af, Depth> 0.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area(ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph 0 Runoff J 0.66 cfs 1 0.65=4 Type II 24-hr 08 2-Year Rainfall=4.00" 0.55: Runoff Area=0.810 ac �O 0.5= 0.45= Runoff Volume=4.054 af 4 03 0.4 Runoff Depth>0.81'' js LL .35' Tc=17.2 rein �i 0.3: / 0.25 L►1\=V'� 0.2= 0.15 ' 0.05o /4e4#0, 674%af�202o 057, %If".Za :"..#iii..r.% Z..�/.Gr,/,ril���.�.* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 7S: North Area 2 To Upper Pond Runoff = 0.58 cfs @ 11.96 hrs, Volume= 0.028 af, Depth> 3.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.020 61 >75%Grass cover, Good, HSG B 0.110 91 Weighted Average 0.020 18.18%Pervious Area 0.090 81.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 7S: North Area 2 To Upper Pond Hydrograph ❑Runoff 0.58 cfs 0.55- Type 11 24-hr •0.5 2-Year Rainfall=4.00" 0.45 10 Runoff Area=0.110 ac °4= I4 Runoff Volume=0.028 of • 0.35j I� Runoff Depth>3.01" • 0.3 0 Tc-5.0 min 0.25 cN=91 0.1= 0.05i,%Yff/////.�///1.////////./1/f//////J////•�/� //.///d///.r///.//.�///�s+f////�./////f//// ° 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type II 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Pale 9 Summary for Subcatchment 8S: Lower Pond Post Developed NE Runoff = 6.44 cfs @ 11.98 hrs, Volume= 0.306 af, Depth> 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area(ac) CN Description 0.870 98 Paved parking, HSG B 1.160 61 >75%Grass cover, Good, HSG B 2.030 77 Weighted Average 1.160 57.14% Pervious Area 0.870 42.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Post Developed NE Hydrograph 7! ❑Runoff ( 6.44 cfs 1 Type 1124-hr 6, 2-Year Rainfall=4.00" Runoff Area=2.030 ac Runoff Volume=0.306 af 4= �0 Runoff De th>1,81" LL - Tc=6.6 min CN=77 0 A/.rffi!!/,/f,%rsl,%/rrxez.ff/////�.-/rs//l'✓'��./i.�iri.�i'.r,.s.0//,/,r./1r�..-/,/rr/,r�-r/s.�r.I/./,.rz 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 10S: North Area 1 To Upper Pond Runoff = 3.37 cfs @ 12.06 hrs, Volume= 0.207 af, Depth> 1.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 0.480 98 Paved parking, HSG B 1.310 61 >75% Grass cover, Good, HSG B 1.790 71 Weighted Average 1.310 73.18% Pervious Area 0.480 26.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 10S: North Area 1 To Upper Pond Hydrograph E.f Runoff ❑ 3.37 cfs Type II 24-hr _ �r 3- 2-Year Rainfall=4.00" . Runoff Area=1.790 ac Runoff Volume=0.207 af 0 2-- Runoff Depth>1.39" 1� Tc=13.1 min CN=71 0 1- 41 0 „.7.,,,,,,07ftz, zeor 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 12S: Uper Pond Post Developed Runoff = 17.68 cfs @ 12.12 hrs, Volume= 1.322 af, Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 2-Year Rainfall=4.00" Area (ac) CN Description 2.680 98 Paved parking, HSG B 10.570 61 >75%Grass cover, Good, HSG B 13.250 68 Weighted Average 10.570 79.77%Pervious Area 2.680 20.23%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 12S: Uper Pond Post Developed Hydrograph D Runoff 19- 1 17.68 cis 18' Type II 24-hr ,;, 17. 16 2-Year Rainfall-4.00" 15� � 14 Runoff Area=13.250 ac i� 12 Runoff Volume=1,322 af i. Runoff Depth>1.20" 1� Tc=18.0 min jr CN=68 % . 0"/Or JO N"'1���//��J1.��!�./�/VJ%%///,! 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 11 24-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 12 Summary for Pond 3P: Upper Pond Inflow Area = 15.150 ac, 21.45% Impervious, Inflow Depth > 1.23" for 2-Year event Inflow = 20.79 cfs @ 12.10 hrs, Volume= 1.557 af Outflow = 8.10 cfs @ 12.36 hrs, Volume= 1.557 af, Atten=61%, Lag= 15.7 min Primary = 8.10 cfs @ 12.36 hrs, Volume= 1.557 of Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt=0.01 hrs Peak Elev= 529.09'@ 12.36 hrs Surf.Area=5,651 sf Storage= 13,169 cf Plug-Flow detention time= 9.7 min calculated for 1.556 af(100%of inflow) Center-of-Mass det.time=9.7 min ( 877.3-867.6) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L= 84.7' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'/519.10' S=0.0481 '/' Cc=0.900 n=0.013 Concrete pipe, bends &connections, Flow Area=0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width (feet) 5.00 15.00 40.00 #3 Device 1 523.17' 11.5"Vert. Orifice/Grate C=0.600 #4 Device 1 532.99' 24.0"x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=8.10 cfs @ 12.36 hrs HW=529.09' TW=513.38' (Dynamic Tailwater) -1 Culvert (Passes 8.10 cfs of 9.62 cfs potential flow) t43V)ririfice/Gmte (Orifice Controls 8.10 cfs @ 11.24 fps) fice/Grate ( Controls 0.00 cfs) -2 Custom Weir/Orifice (Controls 0.00 cfs) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 13 Pond 3P: Upper Pond Hydrograph 23 ❑Inflow 20.79 cfs I ❑Primary 2221-4 Inflow Area=15.150 ac, 4,3 Peak EIev=529.09 ,� ;s Storage-13,169 cf $ 15-3' �� u 13 12 c 11= 0 u. 9 8.10 cfs 81 �. 73 ,/ 5i ';' 41 %'' K040..49r 2' i.%'./f%.:e, ` /////✓J.r/. .//.rf,✓///!//4 l//1Jf//.//r///om...../�'/.I//fr//r//////.�•o' "'„,.//7 o 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 14 Summary for Pond 4P: Lower Pond Inflow Area = 17.990 ac, 22.90% Impervious, Inflow Depth > 1.28" for 2-Year event Inflow = 12.26 cfs @ 12.00 hrs, Volume= 1.917 af Outflow = 12.25 cfs @ 12.00 hrs, Volume= 1.917 af, Atten=0%, Lag=0.3 min Primary = 12.25 cfs @ 12.00 hrs, Volume= 1.917 of Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.01 hrs Peak Elev=513.65'@ 12.00 hrs Surf.Area= 176 sf Storage=97 cf Plug-Flow detention time 0.1 min calculated for 1.917 af(100%of inflow) Center-of-Mass det. time=0.1 min( 871.3-871.3) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic)Listed below(Recatc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP, groove end projecting, Ke= 0.200 Inlet/Outlet Invert= 512.06'/511.06' S= 0.0100'/' Cc= 0.900 n= 0.013 Concrete pipe, bends&connections, Flow Area= 3.14 sf Primary OutFlow Max=12.24 cfs @ 12.00 hrs HW=513.65' (Free Discharge) 'L1=Culvert (Barrel Controls 12.24 cfs @ 6.27 fps) POST Developed Ponds with riser Type 1124-hr 2-Year Rainfall=4.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Pale 15 Pond 4P: Lower Pond Hydrograph /. ..02::: 1216 « ry 13± Inflow Area=17.99 .12.2 12� Peak Elev=513.65' 102, Storage=97 cf r . 9', 24.0" 0fj` 2 7; Round Culvert 0! g 7j � %j ii 6- n=9.0'13 t 53 L=1 00.0' r 4- 31 S=0.0100 71 0 ;#11// 2 / , i�li iir�i�,%�i/s�'��r,��.%,%�r,.r/r/I4I•II'I 11 X/17/AV07//.///r4;71/.'////!1.�'fr'.a's.!/7/� 01 r%f/.!/////!/!/!/!!////!!/!e//�/l///./.,/�/.�/��' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 16 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00% Impervious Runoff Depth>1.99" Tc=17.2 min CN=61 Runoff=1.89 cfs 0.135 of Subcatchment 7S: North Area 2 To Upper Pond Runoff Area=0.110 ac 81.82%Impervious Runoff Depth>4.95" Tc=5.0 min CN=91 Runoff=0.92 cfs 0.045 af Subcatchment 8S: Lower Pond Post Developed Runoff Area=2.030 ac 42.86% Impervious Runoff Depth>3.47" Tc=6.6 min CN=77 Runoff=12.21 cfs 0.588 af Subcatchment 10S: North Area 1 To Upper Runoff Area=1.790 ac 26.82% Impervious Runoff Depth>2.89" Tc=13.1 min CN=71 Runoff=7.16 cfs 0.431 af Subcatchment 12S: Uper Pond Post DevelopedRunoff Area=13.250 ac 20.23% Impervious Runoff Depth>2.61" Tc=18.0 min CN=68 Runoff=40.63 cfs 2.878 af Pond 3P: Upper Pond Peak Elev=532.99' Storage=45.366 cf Inflow=47.28 cfs 3.355 af Outflow=10.61 cfs 3.354 af Pond 4P: Lower Pond Peak EIev=514.46' Storage=392 cf Inflow=20.84 cfs 4.076 af 24.0" Round Culvert n=0.013 L=100.0' S=0.0100'/' Outflow=20.44 cfs 4.076 af Total Runoff Area=17.990 ac Runoff Volume=4.077 af Average Runoff Depth =2.72" 77.10%Pervious=13.870 ac 22.90%Impervious=4.120 ac POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 55: Lower Pond Pre Developed SW Runoff = 1.89 cfs @ 12.10 hrs, Volume= 0.135 af, Depth> 1.99" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area • Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph / 0 Runoff 2 1 1.89 cfs Type II 24-hr 10-Year Rainfall=6.00" Runoff Area=0:810 ac y� Runoff Volume=0.135 af Runoff Depth>1.99" f� Tc=17.2 rain • CN=61 %r r 0 , rioi f.%iieiiir it.e ris �iorsfrir,.i.�,e�.rsrie00550074 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 7S: North Area 2 To Upper Pond Runoff = 0.92 cfs @ 11.96 hrs, Volume= 0.045 af, Depth> 4.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span=0.00-24.00 hrs, dt=0.01 hrs Type 1124-hr 10-Year Rainfall=6.00" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.020 61 >75%Grass cover, Good, HSG B 0.110 91 Weighted Average 0.020 18.18% Pervious Area 0.090 81.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 7S: North Area 2 To Upper Pond Hydrograph 1- ❑Runoff 0.92 cfs Type II 24-h r 10 10-Year Rainfall=6.00" Runoff Area=0.110 ac io Runoff Volume=0.045 of 1� Runoff Depth>4.95" Tc=5.;0 min 10 CN=91 � / .ter./.rJ�" r�r///J�rr'"A r/*.O.f.O/. .J./i.//. �rffeir,./.3./.rr,//r. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment 8S: Lower Pond Post Developed NE Runoff = 12.21 cfs @ 11.98 hrs, Volume= 0.588 af, Depth> 3.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area(ac) CN Description 0.870 98 Paved parking, HSG B 1.160 61 >75% Grass cover, Good, HSG B 2.030 77 Weighted Average 1.160 57.14% Pervious Area 0.870 42.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Post Developed NE Hydrograph ❑Runoff 13" 12.21 cfs 12= Type II 24-hr 113 10-Year Rainfall=6.00" 10 Runoff Area=2.030 ac Runoff Volume=0.588 af Runoff Depth>3.47" LL 6' 01 Tc=5.6 min 5] !04 CN=77 1 OM", r,/////.ii'.•%/.///..///,,`/ ,/////,r/.�rr/../�//r.►s� ° 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 10S: North Area 1 To Upper Pond Runoff = 7.16 cfs @ 12.05 hrs, Volume= 0.431 af, Depth> 2.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area(ac) CN Description 0.480 98 Paved parking, HSG B 1.310 61 >75% Grass cover, Good, HSG B 1.790 71 Weighted Average 1.310 73.18% Pervious Area 0.480 26.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 10S: North Area 1 To Upper Pond Hydrograph ❑Runoff 7.16 cfs Type 1124-hr 10-Year Rainfall=6.00" 6- Runoff Area=1.790 ac 57 Runoff Volume=0.431 af Runoff Depth>2.89" 41 A Tc=13.1 min 34 CN=71 1 y '�`�`!I//r f!/.1/./,..,�rri�,/e/%•�//,�//r,�.'/rrrf,�//•r,��/,i� I.•'rf,I 1.��/.r✓/ �r� r/O o 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 12S: Uper Pond Post Developed Runoff = 40.63 cfs @ 12.10 hrs, Volume= 2.878 af, Depth> 2.61" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=6.00" Area (ac) CN Description 2.680 98 Paved parking, HSG B 10.570 61 >75% Grass cover, Good, HSG B 13.250 68 Weighted Average 10.570 79.77%Pervious Area 2.680 20.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 12S: Uper Pond Post Developed r Hydrograph ❑Runoff 42= 40.63 cfs 40 Type 1124-hr ,/ 38--' 10-Year Rainfall=6.00" 341- 100A 32' Runoff Area=13.250 ac 26 Runoff Volume-2.878 af I 24i Runoff Depth>2.61" iO LL 201 Tc=18.0 min 0/ 161 CN=68 j sy f 2 ,/•' 449.% /If/ Ze."///.lf///////- Q ////////1/r//.i/////f//.�f/,�/./1.410- ///O// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 11 24-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 22 Summary for Pond 3P: Upper Pond Inflow Area= 15.150 ac, 21.45% Impervious, Inflow Depth > 2.66" for 10-Year event Inflow = 47.28 cfs @ 12.10 hrs, Volume= 3.355 af Outflow = 10.61 cfs @ 12.51 hrs, Volume= 3.354 af, Atten=78%, Lag=24.9 min Primary = 10.61 cfs @ 12.51 hrs, Volume= 3.354 of Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt=0.01 hrs Peak Elev=532.99'@ 12.51 hrs Surf.Area= 11,153 sf Storage=45,366 cf Plug-Flow detention time= 31.3 min calculated for 3.353 af(100%of inflow) Center-of-Mass det. time= 31.2 min(876.5-845.3) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L=84.7' RCP, groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'!519.10' S=0.0481 'P Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area=0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width (feet) 5.00 15.00 40.00 #3 Device 1 523.17' 11.5"Vert. Orifice/Grate C= 0.600 #4 Device 1 532.99' 24.0"x 24.0"Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=10.61 cfs @ 12.51 hrs HW=532.99' 1W=513.64' (Dynamic Tailwater) -1 Culvert (Passes 10.61 cfs of 11.52 cfs potential flow) 3 Orifloe/Grate (Orifice Controls 10.61 cfs @ 14.71 fps) ice/Grate ( Controls.0.00 cfs) -2=Custom Weir/Orifice ( Controls 0.00 cfs) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 23 Pond 3P: Upper Pond Hydrograph ❑Inflow 47.28 cfs 1 0 Primary Inflow Area=15.150 a f 457 Peak Elev=532.991 Storage=45,366 cf 30r 0 25 7 u. 20• 152 10.61 cfs 10; 4 eg..7 7,0 0171 Or,��I767.�.II.�rlldf�/Ji�.r��1 :/✓�i�.rr%r�ifJ�/f� A.��.�.g.�ofeze-/*�/i���� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 sin 06538 ©2013 HydroCAD Software Solutions LLC Page 24 Summary for Pond 4P: Lower Pond Inflow Area= 17.990 ac, 22.90% Impervious, Inflow Depth> 2.72" for 10-Year event Inflow = 20.84 cfs @ 11.99 hrs, Volume= 4.076 af Outflow = 20.44 cfs @ 12.01 hrs, Volume= 4.076 af, Atten=2%, Lag= 1.2 min Primary = 20.44 cfs @ 12.01 hrs, Volume= 4.076 af Routing by Dyn-Stor-Ind method,Time Span=0.00-24.00 hrs, dt= 0.01 hrs Peak Elev=514.46'@ 12.01 hrs Surf.Area= 721 sf Storage= 392 cf Plug-Flow detention time= 0.1 min calculated for 4.075 af(100%of inflow) Center-of-Mass det.time=0.1 min( 867.7-867.6) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic)Listed below(Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP, groove end projecting, Ke= 0.200 Inlet/Outlet Invert= 512.06'/511.06' S= 0.0100'/' Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 3.14 sf Primary OutFlow Max=20.44 cfs @ 12.01 hrs HW=514.46' (Free Discharge) Li�ulvert (Barrel Controls 20.44 cfs @ 6.87 fps) POST Developed Ponds with riser Type 1124-hr 10-Year Rainfall=6.00" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 25 Pond 4P: Lower Pond Hydrograph .122.1.1 23 20.84 cfs ;211 20.44 cfs Inflow Area=17.990 ac 20= 19' Peak Elev=514.46' 18; I it 17 / Storage=392 cf ;� ' 24.0" 12a � �J� Round Culvert m 19 ft + n--4,413•8' 02 / / -1040" 76= f / L 4 s=o.010o r 3 �`'�iiiffiieAff fii,%iii%ii%iii/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 26 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 5S: Lower Pond Pre Developed Runoff Area=0.810 ac 0.00% Impervious Runoff Depth>3.81" Tc=17.2 min CN=61 Runoff=3.73 cfs 0.257 af Subcatchment 7S: North Area 2 To Upper Pond Runoff Area=0.110 ac 81.82% Impervious Runoff Depth>7.41" Tc=5.0 min CN=91 Runoff=1.33 cfs 0.068 af Subcatchment 8S: Lower Pond Post Developed Runoff Area=2.030 ac 42.86%Impervious Runoff Depth>5.73" Tc=6.6 min CN=77 Runoff=19.68 cfs 0.969 af Subcatchment 10S: North Area 1 To Upper Runoff Area=1.790 ac 26.82% Impervious Runoff Depth>5.00" Tc=13.1 min CN=71 Runoff=12.35 cfs 0.746 of Subcatchment 12S: Uper Pond Post DevelopedRunoff Area=13.250 ac 20.23% Impervious Runoff Depth>4.64" Tc=18.0 min CN=68 Runoff=72.97 cfs 5.120 of Pond 3P: Upper Pond Peak Elev=534.71' Storage=66.712 cf Inflow=84.36 cfs 5.933 af Outflow=58.61 cfs 5.933 af Pond 4P: Lower Pond Peak EIev=519.48' Storage=14.526 cf Inflow=64.09 cfs 7.159 af 24.0" Round Culvert n=0.013 L=100.0' S=0.0100'P Outflow=40.84 cfs 7.159 af Total Runoff Area=17.990 ac Runoff Volume=7.159 af Average Runoff Depth=4.78" 77.10%Pervious=13.870 ac 22.90%Impervious=4.120 ac POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8 50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 5S: Lower Pond Pre Developed SW Runoff = 3.73 cfs @ 12.10 hrs, Volume= 0.257 af, Depth> 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area(ac) CN Description 0.000 98 Paved parking, HSG B 0.810 61 >75%Grass cover, Good, HSG B 0.810 61 Weighted Average 0.810 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.2 Direct Entry, Subcatchment 5S: Lower Pond Pre Developed SW Hydrograph / ❑Runoff 4- 1 3.73 cfs I Type 1124-hr 100-Year Rainfall=8.50.. Runoff Area=0.810 ac Runoff Volume=0.257 af 2J Runoff Depth>3.81" L Tc=17.2 min !% CN=61 0/ 1 (0', t_/,/ �r/fir,/►/iilr.�1/�ps/vim✓/��/r� /�r�� r� �f Fro 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment 7S: North Area 2 To Upper Pond Runoff = 1.33 cfs @ 11.96 hrs, Volume= 0.068 af, Depth> 7.41" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN, Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 0.090 98 Paved parking, HSG B 0.020 61 >75% Grass cover, Good, HSG B 0.110 91 Weighted Average 0.020 18.18% Pervious Area 0.090 81.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 7S: North Area 2 To Upper Pond Hydrograph / ❑Runoff 1.33 cfs Type II 24-hr ,10 100-Year Rainfall=8.50" 1 � Runoff Area=0.110 ac it Runoff Volume=0.068 af 0:0 Runoff Depth>7.41" o LL �� Tc=5.0 min CN=91 0 %//////./..//i/.////!//////////,/f/./':!O/f/��/1� /l//1/////e//////////�eztz,///ox".//ri, 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type ll 24-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 29 Summary for Subcatchment 8S: Lower Pond Post Developed NE Runoff = 19.68 cfs @ 11.98 hrs, Volume= 0.969 af, Depth> 5.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span= 0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 0.870 98 Paved parking, HSG B 1.160 61 >75%Grass cover, Good, HSG B 2.030 77 Weighted Average 1.160 57.14% Pervious Area 0.870 42.86% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 Direct Entry, Subcatchment 8S: Lower Pond Post Developed NE Hydrograph 22/ 21- ❑Runoff 19.68 cfs 20 19 Type 11 24-hr 18 �I 100-Year Rainfall=8.50" '6" ;0 151 ;d Runoff Area=2.030 ac 14+ is Runoff Volume=0.969 af 13; 12 Runoff Depth>5.73" 10: Tc=6.6min CN=77 3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 30 Summary for Subcatchment 10S: North Area 1 To Upper Pond Runoff = 12.35 cfs @ 12.05 hrs, Volume= 0.746 af, Depth> 5.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN,Time Span=0.00-24.00 hrs, dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 0.480 98 Paved parking, HSG B 1.310 61 >75%Grass cover, Good, HSG B 1.790 71 Weighted Average 1.310 73.18% Pervious Area 0.480 26.82% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.1 Direct Entry, Subcatchment 10S: North Area 1 To Upper Pond Hydrograph ❑Runoff 13- 1 12.35 cfs I 12 Type I124-hr j 11 100-Year Rainfall=8.50" sr °^ Runoff Area=1.790 ac Runoff Volume=0.746 of off 7 Runoff Depth>5.00" io LL 6 Tc=13.1 min 5a CN=71 4= /j 3-: 0# ° /e/!/!/..r.,ir..rlii,/..rl/or/Z,%9ir/,�... . _ri 0";,/.,,. /!.7/d/,e);,7*ilir 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 31 Summary for Subcatchment 12S: Uper Pond Post Developed Runoff = 72.97 cfs @ 12.10 hrs, Volume= 5.120 af, Depth> 4.64" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN, Time Span=0.00-24.00 hrs,dt=0.01 hrs Type II 24-hr 100-Year Rainfall=8.50" Area (ac) CN Description 2.680 98 Paved parking, HSG B 10.570 61 >75% Grass cover, Good, HSG B 13.250 68 Weighted Average 10.570 79.77%Pervious Area 2.680 20.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 18.0 Direct Entry, Subcatchment 12S: Uper Pond Post Developed Hydrograph 80-= ❑Runoff 75= 72.97 cfs 1 70 Type ii 24-hr 65' 100-Year Rainfall=8,50" ::i 1 Runoff Area=13.250 ac 50 Runoff Volume=5.120 af 451 Runoff Depth>4.64" • 4 0. Tc=18.0 min 3°. G N=68 e 20:1 15 104 /"4e l,/41"10W-04////ll.///////Jiii/!. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 32 Summary for Pond 3P: Upper Pond Inflow Area= 15.150 ac, 21.45% Impervious, Inflow Depth > 4.70" for 100-Year event Inflow = 84.36 cfs @ 12.10 hrs, Volume= 5.933 of Outflow = 58.61 cfs @ 12.22 hrs, Volume= 5.933 af, Atten= 31%, Lag=7.4 min Primary = 58.61 cfs @ 12.22 hrs, Volume= 5.933 af Routing by Dyn-Stor-Ind method, Time Span=0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 534.71'@ 12.22 hrs Surf.Area= 12,894 sf Storage= 66,712 cf Plug-Flow detention time=32.2 min calculated for 5.930 af(100%of inflow) Center-of-Mass det.time= 32.1 min (861.5-829.4) Volume Invert Avail.Storage Storage Description #1 523.17' 70,449 cf Custom Stage Data(Prismatic)Listed below (Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 523.17 1 0 0 524.00 131 55 55 525.00 784 458 512 526.00 1,786 1,285 1,797 527.00 2,962 2,374 4,171 528.00 4,225 3,594 7,765 529.00 5,532 4,879 12,643 530.00 6,795 6,164 18,807 531.00 8,146 7,471 26,277 532.00 9,583 8,865 35,142 533.00 11,175 10,379 45,521 534.00 12,894 12,035 57,555 535.00 12,894 12,894 70,449 Device Routing Invert Outlet Devices #1 Primary 523.17' 12.0" Round Culvert L=84.7' RCP,groove end projecting, Ke=0.200 Inlet/Outlet Invert= 523.17'/519.10' S=0.0481 '/' Cc= 0.900 n=0.013 Concrete pipe, bends&connections, Flow Area= 0.79 sf #2 Primary 533.75' Custom Weir/Orifice, Cv=2.62(C=3.28) Elev. (feet) 533.75 534.15 535.00 Width (feet) 5.00 15.00 40.00 #3 Device 1 523.17' 11.5"Vert.Orifice/Grate C= 0.600 #4 Device 1 532.99' 24.0"x 24.0" Horiz.Orifice/Grate C=0.600 Limited to weir flow at low heads Primary OutFlow Max=58.60 cfs @ 12.22 hrs HW=534.71' 1W=517.90' (Dynamic Tailwater) 1�uivert (Barrel Controls 12.26 cfs© 15.61 fps) -3 Orifice/Grate (Passes< 11.55 cfs potential flow) rifice/Grate (Passes<25.26 cfs potential flow) 2=Custom Weir/Orifice (Weir Controls 46.34 cfs @ 2.72 fps) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 33 Pond 3P: Upper Pond Hydrograph 0�_ 84.36 cfs } 85= Inflow Area=15.150 ac; so, Peak EIev=534:71' , g 7 Storage=66,712 cf 1 65' 60-; j 58.61 cfs 1r 55= 6404 50 g 453 u. 40 3si 25 /f 201 151 %//�f�r 15 I.�r�.�f.jf��f��i�r,.•..-,✓,��.++ /.��fe•�-r„r� • "'.0••i,,�rr rO`r��/»r✓-,,�,��. 5113-r/.•"../rl�.�" 0 1r.")''.//./,•✓/7 2//,i/./.•,,��././.,��/�./.r7/r�.r�/r .r���s/,.r�r/i,�/�rf,�,/,�,/.f.�/�' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 34 Summary for Pond 4P: Lower Pond Inflow Area= 17.990 ac, 22.90% Impervious, Inflow Depth> 4.78" for 100-Year event Inflow = 64.09 cfs @ 12.22 hrs, Volume= 7.159 af Outflow = 40.84 cfs @ 12.35 hrs, Volume= 7.159 af, Allen= 36%, Lag=8.2 min Primary = 40.84 cfs @ 12.35 hrs, Volume= 7.159 af Routing by Dyn-Stor-Ind method,Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev=519.48'@ 12.35 hrs Surf.Area=4,943 sf Storage= 14,526 cf Plug-Flow detention time= 1.1 min calculated for 7.159 af(100%of inflow) Center-of-Mass det.time= 1.1 min( 854.2-853.1 ) Volume Invert Avail.Storage Storage Description #1 512.06' 105,708 cf Custom Stage Data(Prismatic)Listed below(Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (so-ft) (cubic-feet) (cubic-feet) 512.06 1 0 0 513.00 49 24 24 514.00 244 147 170 515.00 1,283 764 934 516.00 2,063 1,673 2,607 517.00 2,796 2,430 5,036 518.00 3,590 3,193 8,229 519.00 4,477 4,034 12,263 520.00 5,447 4,962 17,225 521.00 6,628 6,038 23,262 522.00 7,975 7,302 30,564 523.00 9,324 8,650 39,213 524.00 10,780 10,052 49,265 525.00 12,325 11,553 60,818 526.00 14,037 13,181 73,999 527.00 15,846 14,942 88,940 528.00 17,689 16,768 105,708 Device Routing Invert Outlet Devices #1 Primary 512.06' 24.0" Round Culvert L= 100.0' RCP,groove end projecting, Ke=0.200 Inlet/Outlet Invert=512.06'!511.06' S=0.0100'/' Cc=0.900 n=0.013 Concrete pipe, bends&connections, Flow Area=3.14 sf Primary OutFlow Max=40.84 cfs @ 12.35 hrs HW=519.48' (Free Discharge) 'L1=Culvert (Barrel Controls 40.84 cfs @ 13.00 fps) POST Developed Ponds with riser Type 1124-hr 100-Year Rainfall=8.50" Prepared by Microsoft Printed 3/26/2014 HydroCAD®10.00 s/n 06538 ©2013 HydroCAD Software Solutions LLC Page 35 Pond 4P: Lower Pond Hydrograph ❑Inflow 70 1 64.09 cfs I ❑Primary 65 Inflow Area=17.990 ac 60- Peak Elev=51 9.48' 4 50:7 11 cf �1 45'7: 24.0" I t 40.84 cfs "j Round Culvert , ' , '0 30� n=0.01 S! 25 L=100.0' /f 20-, S=0.0100 '/' 'f .f 15 fi ,,e 49:007 AW.. Pi.7/.1/,57,or//f./�J1.4:(40 ///J///f/ '/ .//J2003372i7∎∎72;7.0 0 "./1Y//J//J///f/J//J/.///////////// r 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours)