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HomeMy WebLinkAbout08/27/2019 - Final Stormwater Report & O&M Plan (Part 2) - 481 Sutton Street �PMA PR1 B Detained n-Detained 1P Detention B in DP-1 DP-1 Subcat Fieach on Link Routing Diagram for Proposed Conditions-PIPE Prepared by DeVellis Zrein Inc., Printed 7/31/2019 HydroCAD®10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC 37 North Andover Senior Center Proposed Conditions-PIPE Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD®10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Paqe 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.538 61 >75%Grass cover, Good, HSG B (PR1 A, PR1 B) 0.191 98 Building, HSG B (PR1 A) 0.423 98 Parking, Walkways, HSG B (PR1 A) 0.362 98 Paved parking, HSG B (PR1 B) 1.514 85 TOTAL AREA 38 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 0.50 Inch Rainfall=O.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Paae 3 Summary for Subcatchment Pill A: Detained Runoff = 0.02 cfs @ 12.16 hrs, Volume= 0.004 af, Depth= 0.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 0.50 Inch Rainfall=0.50" Area (sf) CN Description 8,304 98 Building, HSG B 7,888 61 >75% Grass cover, Good, HSG B 18,446 98 Parking, Walkways, HSG B 34,638 90 Weighted Average 7,888 22.77% Pervious Area 26,750 77.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f 0 (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PR1A: Detained Hydrograph 0.026 0.02 cfs 0.0241,- j 1 -1 _ 111-24- r ype 0.022- 0.50 111ch Rain'M111=0.50", 0.02- ............. 0.018: s _RUno'ffVo1unie-.0.Q04_at F 0.016 0.014- 4 1 .1, RUnoffDebth=0.06" 0.012 LL TO-1 6.Q-inin 0.01 imm -T T CNAd-- 0.008 T I T I lr 0.006 1 T_ 1 1 1- T I ...... 0.004- 0.002: �j J I I I J....1. I _1 I I I 0 iM1qiM+q1+m j I it+1 1 7LI milt�qjmqljq. 1" 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1920 21 2223 24 2526 27 28 29 30 31 32 33 34 35 36 Time (hours) 39 North Andover Senior Center Proposed Conditions-PIPE Type Ill 24-hr 0.50 Inch Rainfall=0.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAIDO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment PR1 B: Un-Detained Runoff = 0.00 cfs @ 24.07 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 0.50 Inch Rainfall=0.50" Area (sf) CN Description 15,776 98 Paved parking, HSG B 15,556 61 >75% Grass cover, Good, HSG B 31,332 80 Weighted Average 15,556 49.65% Pervious Area 15,776 50.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment PR1 B: Un-Detained Hydrograph Type 1,11 ,24-,h r 0150 Ill106,K RaiOfalj-_'U 50',' Runoff Area�31,332, sf uhoffV, 611u' 'e-0.000 6f Runoff Depth; .10107 0 LL T6 16.0 in'll CN-80 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 40 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 0.50 Inch Rainfall=O.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 5 Summary for Reach DP-1: DP-1 Inflow Area= 1.514 ac, 64.46% Impervious, Inflow Depth = 0.00" for 0.50 Inch event Inflow = 0.00 cfs @ 24.07 hrs, Volume= 0.000 of Outflow = 0.00 cfs @ 24.07 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Reach DP-1: DP-1 Hydrograph Inflow Outflow 1", f'IPW AresLi .5,, i 4 �a I IIIJ I ' I 1 1 , 0-1 1" 2 3 4 5 6 7 8 9 10 11 12 13­14 15 16 17 18 19 20 21 22'23­24­25­26­27­28 29 30 31 32 33 34 35 36 Time (hours) 41 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 0.50 Inch Rainfall=0.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD®10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 6 Summary for Pond 1 P: Detention Basin Inflow Area = 0.795 ac, 77.23% Impervious, Inflow Depth = 0.06" for 0.50 Inch event Inflow = 0.02 cfs @ 12.16 hrs, Volume= 0.004 of Outflow = 0.02 cfs @ 12.37 hrs, Volume= 0.004 af, Atten= 17%, Lag= 12.3 min Discarded = 0.02 cfs @ 12.37 hrs, Volume= 0.004 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 161.01' @ 12.37 hrs Surf.Area= 3,360 sf Storage= 9 cf Plug-Flow detention time= 7.0 min calculated for 0.004 of (100% of inflow) Center-of-Mass det. time= 7.0 min ( 936.9 - 929.9 ) Volume Invert Avail.Storage Storage Description #1 161.00' 2,399 cf Custom Stage Data(Prismatic) Listed below (Recalc) 8,400 cf Overall - 2,403 cf Embedded = 5,997 cf x 40.0%Voids #2 161.50' 2,403 cf 18.0" Round Pipe Storage x 17 Inside#1 L= 80.0' 4,802 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 161.00 3,360 0 0 162.00 3,360 3,360 3,360 163.00 3,360 3,360 6,720 163.50 3,360 1,680 8,400 Device Routing Invert Outlet Devices #1 Primary 161.65' 12.0" Round Culvert L= 106.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/Outlet Invert= 161.65'/ 157.90' S= 0.0354 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 161.00' 1.020 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 159.00' Discarded OutFlow Max=0.08 cfs @ 12.37 hrs HW=161.01' (Free Discharge) L2=Exfiltration ( Controls 0.08 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=161.00' (Free Discharge) L1=Culvert ( Controls 0.00 cfs) 42 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 0.50 Inch Rainfall=O.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@ 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Pacie 7 Pond 1 P: Detention Basin Hydrograph Inflow Outflow 0.024 , I , =09Discard ed 1 1 1 1 � n o Aeda .75aC� ""Primary 0.022 0.02 cfs 1, 0.02 Freak E[ev=1 6-1 0-1 1 , 0.018- - 9-C I 1 71 1 1 0.016 0.014- LL 0.012' T 0.01 1, 1 t -Ir 0.008- 0.006 - I -i T F 1 7 1 19 1 1 0.004- 2 3 4 5 6 7 8 9 10 11 12 13 1415 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 43 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 0.50 Inch Rainfall=0.50" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD010.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 8 Stage-Discharge for Pond 1 P: Detention Basin Elevation Discharge Discarded Primary (feet) (cfs) (cfs) (cfs) 161.00 0.00 0.00 0.00 161.05 0.08 0.08 0.00 161.10 0.08 0.08 0.00 161.15 0.09 0.09 0.00 161.20 0.09 0.09 0.00 161.25 0.09 0.09 0.00 161.30 0.09 0.09 0.00 161.35 0.09 0.09 0.00 161.40 0.10 0.10 0.00 161.45 0.10 0.10 0.00 161.50 0.10 0.10 0.00 161.55 0.10 0.10 0.00 161.60 0.10 0.10 0.00 161.65 0.11 0.11 0.00 161.70 0.12 0.11 0.01 161.75 0.14 0.11 0.03 161.80 0.19 0.11 0.08 161.85 0.25 0.11 0.13 161.90 0.32 0.12 0.21 161.95 0.41 0.12 0.29 162.00 0.51 0.12 0.39 162.05 0.62 0.12 0.50 162.10 0.74 0.12 0.62 162.15 0.87 0.12 0.75 162.20 1.01 0.13 0.88 162.25 1.15 0.13 1.02 162.30 1.30 0.13 1.17 162.35 1.45 0.13 1.32 162.40 1.61 0.13 1.47 162.45 1.76 0.14 1.62 162.50 1.90 0.14 1.76 162.55 2.04 0.14 1.90 162.60 2.16 0.14 2.02 162.65 2.26 0.14 2.11 162.70 2.36 0.15 2.21 162.75 2.46 0.15 2.31 162.80 2.56 0.15 2.41 162.85 2.65 0.15 2.50 162.90 2.74 0.15 2.59 162.95 2.83 0.16 2.67 163.00 2.91 0.16 2.75 163.05 2.99 0.16 2.83 163.10 3.07 0.16 2.91 163.15 3.15 0.16 2.99 163.20 3.23 0.17 3.06 163.25 3.30 0.17 3.13 163.30 3.37 0.17 3.20 163.35 3.44 0.17 3.27 163.40 3.51 0.17 3.34 163.45 3.58 0.18 3.40 163.50 3.65 0.18 3.47 44 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@10.00-24 s/n08761 @2018 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment PR1 A: Detained Runoff = 1.96 cfs @ 12.09 hrs, Volume= 0.144af, Depth= 2.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 2-year Rainfall=3.20" Area (sf) CN Description 8,304 98 Building, HSG B 7,888 61 >75% Grass cover, Good, HSG B 18,446 98 Parking, Walkways, HSG B 34,638 90 Weighted Average 7,888 22.77% Pervious Area 26,750 77.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PR1A: Detained Hydrograph 2- 1.9 cfs � 11 Typi 24-6r 2-year Runoff Area--34,638 sf Flunoff Vialolv 6=0,�14' 4' �Oi' 77I . . . . IRUhOff Depth' 2 1- -[- 11 =2.11T1 TC-6.0 min 6N�610 AT ..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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 45 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment PR1 B: Un-Detained Runoff = 1.15 cfs @ 12.10hrs, Volume= 0.084 af, Depth= 1.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 2-year Rainfall=3.20" Area (sf) CN Description 15,776 98 Paved parking, HSG B 15,556 61 >75% Grass cover, Good, HSG B 31,332 80 Weighted Average 15,556 49.65% Pervious Area 15,776 50.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f t) (f Us e c) (cfs) 6.0 Direct Entry, Subcatchment PR1 B: Un-Detained Hydrograph 1.1 cfs Type 111 24-hr I- I I 2-year Rpiqfal = .20 1wnoff i Area' --"31 k 1,332 Sf RIII 0,ff��VolOme,=O 01$4 at Runoff Depth-.1 .401111 T6-6.0 r IIIIIIIIIII �min CN_80 0- ......... ....... ...... 0 1 2 3 4 5 6 7 8 9 1011 12131415161718192021222324252627282930313233343536 Time (hours) 46 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD010.00-24 s/n 08761 ©2018 HVdroCAD Software Solutions LLC Pace 11 Summary for Reach DP-1: DP-1 Inflow Area= 1.514 ac, 64.46% Impervious, Inflow Depth = 1.01" for 2-year event Inflow = 1.31 cfs @ 12.12 hrs, Volume= 0.128 of Outflow = 1.31 cfs @ 12.12 hrs, Volume= 0.128 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Reach DP-1: DP-1 Hydrograph 1 1 1 1 1 1 1 1 1 1 v Inflow 1.31 CfS I I I I r I I 1 I I I I � I I I I I I I I I Outflow 111floW Are'a_1 :15I14�a'c'I II I I I I 1 I I I I 1 I I I I I I I I I I I I I I I I I I I I I i I I I f I I I I I i i I I I f I I 1 I I I i I I I I I I I I I I I I I I I I f I I I I I I I I i I I i I I I I f I I I I I I i I t I I 1 1 I 1 I r_.. _.r_.r ._r._�....�. r _r_. i L.....r- I--I_...i- ,_...t - ,-...I._ I.._.,_.r....�.....�.._�... N I 1 I I I I I I I I I I I I I I I I i I I I I f I I I I I i I I I I I f I I I I I I I I I I I I I I I I I I I I I I f 1 I I l I I I Of I 1 I I I I I f I I I t I I I I I I I I I I f f I I I I f f I t I I I I I I I I I I I I I f I 1 I I f I I I f I I I I I A I I I I I I I I I I i I I I I I I I I I I I I I I I I I I I I I I I V I I I I I I I I I I I I I i I I I I I I I I I I I I I I I 1 I I I I I I I I I I 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 47 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD®10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 12 Summary for Pond 1 P: Detention Basin Inflow Area= 0.795 ac, 77.23% Impervious, Inflow Depth = 2.17" for 2-year event Inflow = 1.96 cfs @ 12.09 hrs, Volume= 0.144 of Outflow = 0.70 cfs @ 12.37 hrs, Volume= 0.144 af, Atten= 64%, Lag= 16.9 min Discarded = 0.12 cfs @ 12.37 hrs, Volume= 0.100 of Primary = 0.57 cfs @ 12.37 hrs, Volume= 0.044 of Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 162.08' @ 12.37 hrs Surf.Area= 3,360 sf Storage= 1,971 cf Plug-Flow detention time= 76.9 min calculated for 0.144 of (100%of inflow) Center-of-Mass det. time= 76.8 min ( 883.7 - 806.9 ) Volume Invert Avail.Storage Storage Description #1 161.00' 2,399 cf Custom Stage Data(Prismatic) Listed below (Recalc) 8,400 cf Overall - 2,403 cf Embedded = 5,997 cf x 40.0%Voids #2 161.50' 2,403 cf 18.0" Round Pipe Storage x 17 Inside#1 L= 80.0' 4,802 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 161.00 3,360 0 0 162.00 3,360 3,360 3,360 163.00 3,360 3,360 6,720 163.50 3,360 1,680 8,400 Device Routing Invert Outlet Devices #1 Primary 161.65' 12.0" Round Culvert L= 106.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/Outlet Invert= 161.65'/ 157.90' S= 0.0354 T Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 161.00' 1.020 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 159.00' Discarded OutFlow Max=0.12 cfs @ 12.37 hrs HW=162.08' (Free Discharge) L2=Exfiltration ( Controls 0.12 cfs) Primary OutFlow Max=0.57 cfs @ 12.37 hrs HW=162.08' (Free Discharge) L1=Culvert (Inlet Controls 0.57 cfs @ 1.76 fps) 48 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 2018 HydroCAD Software Solutions LLC Page 13 Pond 1 P: Detention Basin Hydrograph 1.96 cfs Inflow 2- Outflow Discarded 1hf 10W IArpp-0.795 a�t Primary Pepk EIPV--' l 621,00v� ;Storg,96=1y971 C f 1- 11 LL 0.70 cfs 0.57 cfs 0.1 s 0 7....8 9 1'6"1'1i"1213 14 15 16 17 18 19 20 21 22 23 24'.25-216'.27­28 29 30 31 32 33 34 35 36 Time (hours) 49 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 2-year Rainfall=3.20" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD010.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 14 Stage-Discharge for Pond 1 P: Detention Basin Elevation Discharge Discarded Primary (feet) (cfs) (cfs) (cfs) 161.00 0.00 0.00 0.00 161.05 0.08 0.08 0.00 161.10 0.08 0.08 0.00 161.15 0.09 0.09 0.00 161.20 0.09 0.09 0.00 161.25 0.09 0.09 0.00 161.30 0.09 0.09 0.00 161.35 0.09 0.09 0.00 161.40 0.10 0.10 0.00 161.45 0.10 0.10 0.00 161.50 0.10 0.10 0.00 161.55 0.10 0.10 0.00 161.60 0.10 0.10 0.00 161.65 0.11 0.11 0.00 161.70 0.12 0.11 0.01 161.75 0.14 0.11 0.03 161.80 0.19 0.11 0.08 161.85 0.25 0.11 0.13 161.90 0.32 0.12 0.21 161.95 0.41 0.12 0.29 162.00 0.51 0.12 0.39 162.05 0.62 0.12 0.50 162.10 0.74 0.12 0.62 162.15 0.87 0.12 0.75 162.20 1.01 0.13 0.88 162.25 1.15 0.13 1.02 162.30 1.30 0.13 1.17 162.35 1.45 0.13 1.32 162.40 1.61 0.13 1.47 162.45 1.76 0.14 1.62 162.50 1.90 0.14 1.76 162.55 2.04 0.14 1.90 162.60 2.16 0.14 2.02 162.65 2.26 0.14 2.11 162.70 2.36 0.15 2.21 162.75 2.46 0.15 2.31 162.80 2.56 0.15 2.41 162.85 2.65 0.15 2.50 162.90 2.74 0.15 2.59 162.95 2.83 0.16 2.67 163.00 2.91 0.16 2.75 163.05 2.99 0.16 2.83 163.10 3.07 0.16 2.91 163.15 3.15 0.16 2.99 163.20 3.23 0.17 3.06 163.25 3.30 0.17 3.13 163.30 3.37 0.17 3.20 163.35 3.44 0.17 3.27 163.40 3.51 0.17 3.34 163.45 3.58 0.18 3.40 163.50 3.65 0.18 3.47 50 North Andover Senior Center Proposed Conditions-PIPE TypeI1124-hr 10-yearRainfall=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment Pill A: Detained Runoff = 3.25 cfs @ 12.09 hrs, Volume= 0.244 af, Depth= 3.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 1 0-year Rainfall=4.80" Area (sf) CN Description 8,304 98 Building, HSG B 7,888 61 >75% Grass cover, Good, HSG B 18,446 98 Parking, Walkways, HSG B 34,638 90 Weighted Average 7,888 22.77% Pervious Area 26,750 77.23% Impervious Area Tc: Length Slope Velocity Capacity Description (min) (feet) (f t/f 0 (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment PR1A: Detained Hydrograph 3.2 cfs 1 ' l 1 1 1 1 , I i , i i iT p ill 24whr3- -1 -171 T r 1 T- ,t r - I ' l , I I I I I I I I I 10-ydar Rpinhill-4.807 Ru nloff�Area '34,,638 Sf 2- Runloff Vol dme=,O144 jaf fthoff Deptih--3.68"I TC- .0 rrI6 6 CN-�-90 IjIIIIIIIIIIIIII "L' I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1920 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 51 North Andover Senior Center Proposed Conditions-PIPE Type III 24-hr 10-yearRainfal/=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment PR1 B: Un-Detained Runoff = 2.25 cfs @ 12.09 hrs, Volume= 0.163 af, Depth= 2.72" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 1 0-year Rainfall=4.80" Area (sf) CN Description 15,776 98 Paved parking, HSG B 15,556 61 >75% Grass cover, Good, HSG B 31,332 80 Weighted Average 15,556 49.65% Pervious Area 15,776 50.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f 0 (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment P131 B: Un-Detained Hydrograph 2.2 cfs —Runoff T�p 10 e 111i �4-hr 2- -ydar Rpinfq110-007 III , 1 ' 1117111 . . . Ru n,off Area-31 �332 sf 7 Ru,noff VojOme='O A 63 of RUIII DePt,h12' TC 16 0 min' lc� I 80 0- 1, 1j"nim III,mil. 0 1 2 3 4 5 6 7 8 9 "I'D 1'1 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 52 North Andover Senior Center Proposed Conditions-PIPE Type11124-hr 10-yearRainfall=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@ 10.00-24 s/n 08761 0 2018 HydroCAD Software Solutions LLC Page 17 Summary for Reach DP-1: DP-1 Inflow Area= 1.514 ac, 64.46% impervious, Inflow Depth = 2.21" for 10-year event Inflow = 3.44 cfs @ 12.12 hrs, Volume= 0.278 of Outflow = 3.44 cfs @ 12.12 hrs, Volume= 0.278 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Reach DP-1: DP-1 Hydrograph 3.44 efs ®Inflow Outflow 111flOW Area-l .5141! 3- 4 - - 2- - - 0 MIT ....... 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2223 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 53 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 10-year Rainfall=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 18 Summary for Pond 1 P: Detention Basin Inflow Area= 0.795 ac, 77.23% Impervious, Inflow Depth = 3.68" for 10-year event Inflow = 3.25 cfs @ 12.09 hrs, Volume= 0.244 of Outflow = 1.73 cfs @ 12.23 hrs, Volume= 0.244 af, Atten= 47%, Lag= 8.3 min Discarded = 0.14 cfs @ 12.23 hrs, Volume= 0.129 of Primary = 1.59 cfs @ 12.23 hrs, Volume= 0.115 of Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 162.44' @ 12.23 hrs Surf.Area= 3,360 sf Storage= 2,887 cf Plug-Flow detention time= 66.5 min calculated for 0.244 of (100%of inflow) Center-of-Mass det. time= 66.4 min ( 858.5 - 792.1 ) Volume Invert Avail.Storage Storage Description #1 161.00' 2,399 cf Custom Stage Data(Prismatic) Listed below (Recalc) 8,400 cf Overall - 2,403 cf Embedded = 5,997 cf x 40.0%Voids #2 161.50' 2,403 cf 18.0" Round Pipe Storage x 17 Inside#1 L= 80.0' 4,802 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 161.00 3,360 0 0 162.00 3,360 3,360 3,360 163.00 3,360 3,360 6,720 163.50 3,360 1,680 8,400 Device Routing Invert Outlet Devices #1 Primary 161.65' 12.0" Round Culvert L= 106.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/Outlet Invert= 161.65'/ 157.90' S= 0.03547' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 161.00' 1.020 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 159.00' Discarded OutFlow Max=0.14 cfs @ 12.23 hrs HW=162.44' (Free Discharge) L2=Exfiltration ( Controls 0.14 cfs) Primary OutFlow Max=1.58 cfs @ 12.23 hrs HW=162.44' (Free Discharge) 't-1=Culvert (Inlet Controls 1.58 cfs @ 2.39 fps) 54 North Andover Senior Center Proposed Conditions-PIPE Type III 24-hr 10-yearRainfal/=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Pacie 19 Pond 1 P: Detention Basin Hydrograph L3.25 cfs I Inflow Outflow Discarded 3- 1hf1OW Area_-0�7915 a�tl - Primary Pe�WEIOV-_' 102.44'� IIII StOr09e=2X7Cf 16 2- 1.73 cfs_11 1.59 cfs; 11 0.14C 0 0 1 2 3 4 5 lmmji.mmil I.till '1"6...1'1­1'2 13 14 1516 17 1'81'49"20 21 22 23 2425 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 55 North Andover Senior Center Proposed Conditions-PIPE Type 111 24-hr 10-year Rainfall=4.80" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADOO 10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Paae 20 Stage-Discharge for Pond 1 P: Detention Basin Elevation Discharge Discarded Primary (feet) (cfs) (cfs) (cfs) 161.00 0.00 0.00 0.00 161.05 0.08 0.08 0.00 161.10 0.08 0.08 0.00 161.15 0.09 0.09 0.00 161.20 0.09 0.09 0.00 161.25 0.09 0.09 0.00 161.30 0.09 0.09 0.00 161.35 0.09 0.09 0.00 161.40 0.10 0.10 0.00 161.45 0.10 0.10 0.00 161.50 0.10 0.10 0.00 161.55 0.10 0.10 0.00 161.60 0.10 0.10 0.00 161.65 0.11 0.11 0.00 161.70 0.12 0.11 0.01 161.75 0.14 0.11 0.03 161.80 0.19 0.11 0.08 161.85 0.25 0.11 0.13 161.90 0.32 0.12 0.21 161.95 0.41 0.12 0.29 162.00 0.51 0.12 0.39 162.05 0.62 0.12 0.50 162.10 0.74 0.12 0.62 162.15 0.87 0.12 0.75 162.20 1.01 0.13 0.88 162.25 1.15 0.13 1.02 162.30 1.30 0.13 1.17 162.35 1.45 0.13 1.32 162.40 1.61 0.13 1.47 162.45 1.76 0.14 1.62 162.50 1.90 0.14 1.76 162.55 2.04 0.14 1.90 162.60 2.16 0.14 2.02 162.65 2.26 0.14 2.11 162.70 2.36 0.15 2.21 162.75 2.46 0.15 2.31 162.80 2.56 0.15 2.41 162.85 2.65 0.15 2.50 162.90 2.74 0.15 2.59 162.95 2.83 0.16 2.67 163.00 2.91 0.16 2.75 163.05 2.99 0.16 2.83 163.10 3.07 0.16 2.91 163.15 3.15 0.16 2.99 163.20 3.23 0.17 3.06 163.25 3.30 0.17 3.13 163.30 3.37 0.17 3.20 163.35 3.44 0.17 3.27 163.40 3.51 0.17 3.34 163.45 3.58 0.18 3.40 163.50 3.65 0.18 3.47 56 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@10.00-24 s/n08761 @2018 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment PR1 A: Detained Runoff = 4.21 cfs @ 12.09 hrs, Volume= 0.321 af, Depth= 4.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=6.00" Area (sf) CN Description 8,304 98 Building, HSG B 7,888 61 >75% Grass cover, Good, HSG B 18,446 98 Parking, Walkways, HSG B 34,638 90 Weighted Average 7,888 22.77% Pervious Area 26,750 77.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f t) (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment PR1A: Detained Hydrograph 4.2 cfs 4- 1. f T pelI lh 24--fir 25-1(6ar HOinfcj11-6.0, 0'1 3 RU.noff Area:�34III _,6 I I I I I I I � 1, 1 1 1 _38 .S11 ROn,6ff�VolLim, 6=0�321 of !Runoff Depth-4.85" _TC 7 1-6 1 Om.-in I qN.;- 190 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 57 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@10.00-24 s/n08761 02018 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment PR1 B: Un-Detained Runoff = 3.11 cfs C@ 12.09 hrs, Volume= 0.227 af, Depth= 3.78" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 25-Year Rainfall=6.00" Area (sf) CN Description 15,776 98 Paved parking, HSG B 15,556 61 >75% Grass cover, Good, HSG B 31,332 80 Weighted Average 15,556 49.65% Pervious Area 15,776 50.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f t) (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment PR1 B: Un-Detained Hydrograph 3.11 cis 3- J. t -- -T- -* - Ill 24 hr . . .Yp� 25-Y6,ar RO[nfqll�-6.00'! RunoffArea-31,332 Sf 7 2- RUnbiff Y,010m, 6=0 227 at 717 111111111 1 fthoff DePth-_3.78111 0 Tc-6.0 min', -CN-80 .. .......... . .. ........ I f I 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 58 North Andover Senior Center Proposed Conditions-PIPE Type ///24-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@10.00-24 s/n08761 @2018 HydroCAD Software Solutions LLC Pace 23 Summary for Reach DP-1: DP-1 Inflow Area = 1.514 ac, 64.46% Impervious, Inflow Depth = 3.18" for 25-Year event Inflow = 4.98 cfs @ 12.11 hrs, VolunI 0.402 of Outflow = 4.98 cfs @ 12.11 hrs, Volume= 0.402 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Reach DP-1: DP-1 Hydrograph 4.98 CfS F—Inflow 5- Outflow WIOWArea�IlZ�14iaa 4- Al.- L -1 -11 A I 3- - I I I I I .2 2- 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 59 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 24 Summary for Pond 1 P: Detention Basin Inflow Area= 0.795 ac, 77.23% Impervious, Inflow Depth = 4.85" for 25-Year event Inflow = 4.21 cfs @ 12.09 hrs, Volume= 0.321 of Outflow = 2.37 cfs @ 12.22 hrs, Volume= 0.321 af, Atten= 44%, Lag= 7.7 min Discarded = 0.15 cfs @ 12.22 hrs, Volume= 0.146 of Primary = 2.22 cfs @ 12.22 hrs, Volume= 0.175 of Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 162.70' @ 12.22 hrs Surf.Area= 3,360 sf Storage= 3,529 cf Plug-Flow detention time= 63.0 min calculated for 0.321 of (100%of inflow) Center-of-Mass det. time= 63.0 min ( 847.7 - 784.7 ) Volume Invert Avail.Storage Storage Description #1 161.00' 2,399 cf Custom Stage Data(Prismatic) Listed below (Recalc) 8,400 cf Overall - 2,403 cf Embedded = 5,997 cf x 40.0% Voids #2 161.50' 2,403 cf 18.0" Round Pipe Storage x 17 Inside#1 L= 80.0' 4,802 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 161.00 3,360 0 0 162.00 3,360 3,360 3,360 163.00 3,360 3,360 6,720 163.50 3,360 1,680 8,400 Device Routing Invert Outlet Devices #1 Primary 161.65' 12.0" Round Culvert L= 106.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/Outlet Invert= 161.65'/ 157.90' S= 0.0354 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight &clean, Flow Area= 0.79 sf #2 Discarded 161.00' 1.020 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 159.00' Discarded OutFlow Max=0.15 cfs @ 12.22 hrs HW=162.70' (Free Discharge) 'L2=Exfiltration ( Controls 0.15 cfs) Primary OutFlow Max=2.21 cfs @ 12.22 hrs HW=162.70' (Free Discharge) L1=Culvert (Inlet Controls 2.21 cfs @ 2.81 fps) 60 North Andover Senior Center Proposed Conditions-PIPE Type 111 24-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 2018 HydroCAD Software Solutions LLC Page 25 Pond 1 P: Detention Basin Hydrograph L4.-21 cis —Inflow —Outflow —Dis arded 4- — Inf lo Ariga ' 0 795 ga Primary ;PeIaK� E10V-_'1 62.7W 3- _..,St0r9,ge=3'-4 Of 9 IQ I 4� ❑ 1 2 is 2- 1 0. 5 Cf 0, ................ 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1516 17 18 19 20.21...22. 23 24 25 26 27 28 2'9' '3"03'1 32 33 34 35 36 Time (hours) 61 North Andover Senior Center Proposed Conditions-PIPE Type 111 24-hr 25-Year Rainfall=6.00" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10 00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 26 Stage-Discharge for Pond 1 P: Detention Basin Elevation Discharge Discarded Primary (feet) (cfs) (cfs) (cfs) 161.00 0.00 0.00 0.00 161.05 0.08 0.08 0.00 161.10 0.08 0.08 0.00 161.15 0.09 0.09 0.00 161.20 0.09 0.09 0.00 161.25 0.09 0.09 0.00 161.30 0.09 0.09 0.00 161.35 0.09 0.09 0.00 161.40 0.10 0.10 0.00 161.45 0.10 0.10 0.00 161.50 0.10 0.10 0.00 161.55 0.10 0.10 0.00 161.60 0.10 0.10 0.00 161.65 0.11 0.11 0.00 161.70 0.12 0.11 0.01 161.75 0.14 0.11 0.03 161.80 0.19 0.11 0.08 161.85 0.25 0.11 0.13 161.90 0.32 0.12 0.21 161.95 0.41 0.12 0.29 162.00 0.51 0.12 0.39 162.05 0.62 0.12 0.50 162.10 0.74 0.12 0.62 162.15 0.87 0.12 0.75 162.20 1.01 0.13 0.88 162.25 1.15 0.13 1.02 162.30 1.30 0.13 1.17 162.35 1.45 0.13 1.32 162.40 1.61 0.13 1.47 162.45 1.76 0.14 1.62 162.50 1.90 0.14 1.76 162.55 2.04 0.14 1.90 162.60 2.16 0.14 2.02 162.65 2.26 0.14 2.11 162.70 2.36 0.15 2.21 162.75 2.46 0.15 2.31 162.80 2.56 0.15 2.41 162.85 2.65 0.15 2.50 162.90 2.74 0.15 2.59 162.95 2.83 0.16 2.67 163.00 2.91 0.16 2.75 163.05 2.99 0.16 2.83 163.10 3.07 0.16 2.91 163.15 3.15 0.16 2.99 163.20 3.23 0.17 3.06 163.25 3.30 0.17 3.13 163.30 3.37 0.17 3.20 163.35 3.44 0.17 3.27 163.40 3.51 0.17 3.34 163.45 3.58 0.18 3.40 163.50 3.65 0.18 3.47 62 North Andover Senior Center Proposed Conditions-PIPE Type III 24-hr 100-yearRainfa/1=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD@ 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment PR1 A: Detained Runoff = 6.27 cfs @ 12.09 hrs, Volume= 0.490 af, Depth= 7.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 1 00-year Rainfall=8.60" Area (sf) CN Description 8,304 98 Building, HSG B 7,888 61 >75%Grass cover, Good, HSG B 18,446 98 Parking, Walkways, HSG B 34,638 90 Weighted Average 7,888 22.77% Pervious Area 26,750 77.23% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f t) (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment PR1A: Detained Hydrograph 7- 6.27 cis RUnoff 6- T_ T -'�I e[ TI 1 1, -,111i 24-- hrl lyp I I , 11 aipfqll�:0.6 � 00-year R;, I 1 0" 5 1 , I I -i 7 1' 1 'I I I I I I I I I I I RunoffArea-_34,638sf 4­_� ��ROn6, ff V,01114rii6-0-A00 at- I I I 1 17 " I I Riphoff Depth-_' 7.40"i 0 L 3- T' ' c-6.0 min CN-90 Lj I 0 1 1 1 1 1 1 1 1 11mimmilmi'm 1 R? 0 1 2 3 4 5 6 7 8 6 10111213141516171819202122232425262728293031 32 33 34 35 36 Time (hours) 63 North Andover Senior Center Proposed Conditions-PIPE Type III 24-hr 100-yearRainfal/=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment PR1 B: Un-Detained Runoff = 5.00 cfs Cab 12.09 hrs, Volume= 0.371 af, Depth= 6.19" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Type III 24-hr 1 00-year Rainfall=8.60" Area (sf) CN Description 15,776 98 Paved parking, HSG B 15,556 61 >75% Grass cover, Good, HSG B 31,332 80 Weighted Average 15,556 49.65% Pervious Area 15,776 50.35% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f t/f t) (ft/sec) (cf S) 6.0 Direct Entry, Subcatchment Pill B: Un-Detained Hydrograph 5.00 C s 5- Type 111 24-hr 4- JQO,-year Rp(nfall�,-8.6, 07 Runoff Ar6a-1311,1332 slf' 7 Runoff V016M6=0 �371 af, 3- .2 2- .......i._ L1 ' I 1 1 T RU11off DePI tI h--I 6.19 .19 TC-60nhIi CN ' 80 00 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 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 64 North Andover Senior Center Proposed Conditions-PIPE Type III 24-hr 100-yearRainfall=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 @ 2018 HydroCAD Software Solutions LLC Page 29 Summary for Reach DP-1: DP-1 Inflow Area= 1.514 ac, 64.46% Impervious, Inflow Depth = 5.43" for 1 00-year event Inflow = 7.82 cfs @ 12.11 hrs, Volume= 0.685 of Outflow = 7.82 cfs @ 12.11 hrs, Volume= 0.685 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Reach DP-1: DP-1 Hydrograph Outflow 8 F—Inflow 7- T, 6' L il F I T -1 T T in 5 .2 4- 3 2' 1 T 0 0 1 2 3 4 5 6 7 8 9 111...11114 15 16 17 18 1'6­26­2"1 22 2.3....2`4 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours) 65 North Andover Senior Center Proposed Conditions-PIPE Type 111 24-hr 100-year Rainfall=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCAD®10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 30 Summary for Pond 1 P: Detention Basin Inflow Area= 0.795 ac, 77.23% Impervious, Inflow Depth = 7.40" for 100-year event Inflow = 6.27 cfs @ 12.09 hrs, Volume= 0.490 of Outflow = 3.60 cfs @ 12.21 hrs, Volume= 0.490 af, Atten= 43%, Lag= 7.4 min Discarded = 0.18 cfs @ 12.21 hrs, Volume= 0.176 of Primary = 3.43 cfs @ 12.21 hrs, Volume= 0.314 of Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.05 hrs Peak Elev= 163.47' @ 12.21 hrs Surf.Area= 3,360 sf Storage= 4,756 cf Plug-Flow detention time= 58.0 min calculated for 0.490 of (100%of inflow) Center-of-Mass det. time= 57.9 min ( 831.7 - 773.8 ) Volume Invert Avail.Storage Storage Description #1 161.00' 2,399 cf Custom Stage Data(Prismatic) Listed below (Recalc) 8,400 cf Overall - 2,403 cf Embedded = 5,997 cf x 40.0%Voids #2 161.50' 2,403 cf 18.0" Round Pipe Storage x 17 Inside#1 L= 80.0' 4,802 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 161.00 3,360 0 0 162.00 3,360 3,360 3,360 163.00 3,360 3,360 6,720 163.50 3,360 1,680 8,400 Device Routing Invert Outlet Devices #1 Primary 161.65' 12.0" Round Culvert L= 106.0' CMP, projecting, no headwall, Ke= 0.900 Inlet/Outlet Invert= 161.65'/ 157.90' S= 0.03547' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf #2 Discarded 161.00' 1.020 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 159.00' Discarded OutFlow Max=0.18 cfs @ 12.21 hrs HW=163.45' (Free Discharge) L2=Exfiltration ( Controls 0.18 cfs) Primary OutFlow Max=3.41 cfs @ 12.21 hrs HW=163.45' (Free Discharge) L1=Culvert (Inlet Controls 3.41 cfs @ 4.34 fps) 66 North Andover Senior Center Proposed Conditions-PIPE Type 111 24-hr 100-year Rainfall=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroCADO 10.00-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Paae 31 Pond 1 P: Detention Basin Hydrograph 7- 6.27 cfS d Inflow Outflow I � Discard ed -rr F r i. , PrimaryVw r �0.7J5 6 � 5- PIe'ak� �lev_163.4 '_II _ 1......i... __ I 1 I I I , I I I 1 I ,Stbr99P='4j561 cf II � III � � , t 3.43 CfS 3- 2- - i-. _I...t —r_ r .t....r--r. ..L.._,- r 0 8cf 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 25 26 27 28 29 30 31 32 33 3435 36 Time (hours) 67 North Andover Senior Center Proposed Conditions-PIPE Type 11124-hr 100-year Rainfall=8.60" Prepared by DeVellis Zrein Inc. Printed 7/31/2019 HydroC'.ADO 1 n nn-24 s/n 08761 ©2018 HydroCAD Software Solutions LLC Page 32 Stage-Discharge for Pond 1 P: Detention Basin Elevation Discharge Discarded Primary (feet) (cfs) (cfs) (cfs) 161.00 0.00 0.00 0.00 161.05 0.08 0.08 0.00 161.10 0.08 0.08 0.00 161.15 0.09 0.09 0.00 161.20 0.09 0.09 0.00 161.25 0.09 0.09 0.00 161.30 0.09 0.09 0.00 161.35 0.09 0.09 0.00 161.40 0.10 0.10 0.00 161.45 0.10 0.10 0.00 161.50 0.10 0.10 0.00 161.55 0.10 0.10 0.00 161.60 0.10 0.10 0.00 161.65 0.11 0.11 0.00 161.70 0.12 0.11 0.01 161.75 0.14 0.11 0.03 161.80 0.19 0.11 0.08 161.85 0.25 0.11 0.13 161.90 0.32 0.12 0.21 161.95 0.41 0.12 0.29 162.00 0.51 0.12 0.39 162.05 0.62 0.12 0.50 162.10 0.74 0.12 0.62 162.15 0.87 0.12 0.75 162.20 1.01 0.13 0.88 162.25 1.15 0.13 1.02 162.30 1.30 0.13 1.17 162.35 1.45 0.13 1.32 162.40 1.61 0.13 1.47 162.45 1.76 0.14 1.62 162.50 1.90 0.14 1.76 162.55 2.04 0.14 1.90 162.60 2.16 0.14 2.02 162.65 2.26 0.14 2.11 162.70 2.36 0.15 2.21 162.75 2.46 0.15 2.31 162.80 2.56 0.15 2.41 162.85 2.65 0.15 2.50 162.90 2.74 0.15 2.59 162.95 2.83 0.16 2.67 163.00 2.91 0.16 2.75 163.05 2.99 0.16 2.83 163.10 3.07 0.16 2.91 163.15 3.15 0.16 2.99 163.20 3.23 0.17 3.06 163.25 3.30 0.17 3.13 163.30 3.37 0.17 3.20 163.35 3.44 0.17 3.27 163.40 3.51 0.17 3.34 163.45 3.58 0.18 3.40 163.50 3.65 0.18 3.47 68