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HomeMy WebLinkAbout02172012 358 Dale Street North Andover, Mass. 1 Stormwater Report Prepared for: Stephen Smolak February 17,2012 SNOflos s ova ��4, Z PATRICK L. p BOWER v CIVIL u' 7piii48026 a k T �� v\ ON' _ Prepared by: Engineering and Surveying Services 70 Bailey Court Haverhill, MA 01932 _ s ■ Dale Street-North Andover, Mass. Pre-and Post-development Drainage Analysis Pre-Development Area 2-yr 10-yr 25-yr 50-yr 100-yr (acres) (c.f.s.) (c.f.s.) (c.f.s.) (c.f.s.) (c.f.s.) A 1.09 0.09 0.71 1.24 1.61 2.09 B 0.33 0.03 0.19 0.33 0.43 0.56 C 0.13 0.01 0.09 0.16 0.21 0.27 Total 1.56 Wetland East 0.11 0.79 1.39 1.81 2.34 West 0.03 0.19 0.33 0.43 0.56 Pre-Development Area 2-yr 10-yr 25-yr 50-yr 100-yr (acres) (c.f.s.) (c.f.s.) (c.f.s.) (c.f.s.) (c.f.s.) A' 1.08 0.11 0.71 1.22 1.57 2.02 B' 0.23 0.04 0.20 0.33 0.42 0.52 C' 0.16 0.02 0.13 0.21 0.26 0.34 Roof 0.04 0.00 0.00 0.00 0.00 0.00 Driveway 0.05 0.00 0.00 0.00 0.00 0.00 Total 1.56 Wetland East 0.13 0.83 1.41 1.81 2.33 West 0.04 0.20 0.33 0.42 0.52 % 1------- ( B ( A ) ..--\_____ WETLAND 7775 , -----'\.: 0 • • KSub ) Reach 'on Drainage Diagram for 358DALE-PRE-AEC Prepared by ESS 2/20/2012 HydroCAD®8.00 s/n 004178 ®2006 HydroCAD Software Solutions LLC 358DALE-PRE-AEC Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Area Listing (all nodes) Area (acres) CN Description (subcats) 1.558 55 Woods, Good, HSG B (A,B,C) 1.558 358DALE-PRE-AEC Type 11124-hr.Rainfall=3.10" Prepared by ESS Page 3 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A: Runoff = 0.09 cfs @ 12.34 hrs, Volume= 0.020 af, Depth> 0.22" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (ac) CN Description 1.093 55 Woods, Good, HSG B 1.093 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 50 0.2000 0.17 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.2 135 Total Subcatchment A: Hydrograph 1 J 4 L L I J J .L L 1 1 J 1 t -I 1 0.1057,' L I -. I I I I I I I I I I I I - - -* r r I Q Runoff 0.1=! I 1 4 -r r 1 I 1 4 r (009cfs I I -I--7 r 1r r 1 0.095 e I�'24hI r I I r , I I I I I r I I I I I 009! ---' � I I I I I I I 0.065= RdiTfaFr i1A�" _ -+--4--I- 0.075 - Ruhof�f-p1F'e'a�''�L-0 -- y 007-. 1 I I I I I 1 r r I � -1--7--r--r _. 1 r r 1 0.065 --RU-icff 1Vglurn 4.D21 o f S' I I I I I '1 0.06- __ I 1 1 I I , I I Ir I I I I Runoff Depth-I.22! 1 1 1 -�0.055=' J -1 L 1 ftto 1 1 yP 1 1 1 1 c 0.05 ',-- e. " J Flow 1ten the='t35 LL 0.045-' �I !���/y� rtt t��q o.04-s' --Tc 5 2-�1 I r . ,, 1 I � -r--I--1--�--r--r �� � 7 r r 1 r r I 0.035=' _ 1 I j SOS':;'! % I I I I 1 - IA,yR✓ 1 1 1 0.03 -- fF515 I 1 , ' .:,,,d,,,� 0.025 , , , I 4 * 0.02-1" - L I__J__; S 1 1 1 , I L 0.015:' -- -- 1---1 + -I- 1- 1 -1 1 �' �' w 0.01= - 1 I Id',Fy ,p, �p. f , 1 r l r I "1 7 r I I I 7 T K'¢✓ .41a*- 0.005=" ' 1 I 1 I I 1 I I I 1 1 I I 1 I 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) • 358DALE-PRE-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 4 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment B: Runoff = 0.03 cfs @ 12.39 hrs, Volume= 0.006 af, Depth> 0.22" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (ac) CN Description 0.333 55 Woods, Good, HSG B 0.333 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.1 50 0.0600 0.10 Sheet Flow, I Woods: Light underbrush n= 0.400 P2= 3.10" 0.5 125 0.0640 4.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.6 175 Total Subcatchment B: Hydrograph f I I I I I I I I 1 ! I' I 1 I 1 B Runoff 0.03'' ■ 1 1 1 : I I I 1 r , r 1 0.03 Cfa 1-T r 7 r r r r 0.028:, I I I I I y per 1 2 .: 0.026= 1 I 1 1 I I I I 1 k 1 I I 1 I I I ' -Rai nfa IIr3.1-0"1 r r r r r 1 r 1 r 0.024 I I J L L J 1 L L L J 1 L 1 1 0.022. Ruhoff Area=O.333:ae 1 1 T T r 1 T r I ; r 7 r r r 0.02.'' 1 Via.;' 1 1 ROW-+ n `+ ; ' ,I\u������f"����AT af i-'' 1 L J 1 L 1 1 .,� I I i I i i I Q.0,8 Rune bephh �.22� ,,�. 1 ., �- I ,�' r r r r r r r 3 0'016' / L L J 1 L L L 1 E. Flow(Length=175' 1 �' � 1 1 0.014 I I I I :',j I I I I I 1 7 r r r r 1 r 1 7 r 0.012=' , Tc J6 t 1 L "> > ,_ I 1 J I .aL L $ f �9Y'T L ON= 5-r 0/...e..0 006:' _ I 1 o J I L 1 L 0.006 ' I 1 Q.- I 141:‘,4:4" I I I 5 4 0.004 I 1 L L A" 1 1 1 1 1 1 1 1 1 0.002 11 ¢�^ I 1 ,{ A�f g� 1 I ■ ■ I I 1 ; 1 ■ ■ ■ J' 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) 358DALE-PRE-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 5 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C: Runoff = 0.01 cfs @ 12.31 hrs, Volume= 0.002 af, Depth> 0.22" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" . Area (ac) CN Description 0.132 55 Woods, Good, HSG 8 0.132 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfsl 2.7 25 0.2400 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.3 80 0.0750 4.41 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 185 Total Subcatchment C: Hydrograph • I I I I I I I 1 I I 1 1 I 1 1 1 I f I I I i 1 1 1 1 I 1 1 1 1 1 1 V l I 1 1 1 ' 1 I 0.013 j' , 1 - - 1 RUnOff 0.012' , looters� ■ --+--�- I - I -- {--, 0011-!; i_ +- - _ - __,__ _{ __H__I___I__,__}__ 0.0, , 'I ` 1 f, 0.01 ,--RaitII-WI--3.�0 Q(� + �- 1 -1 1- { -', - + ■ 1 1 1 1 1 1 1 I - Ft'. 1 1 1 1 1 1 1 1 1 1 1 0.0091', �' :`.' I I I I 1 1 I I 1 1 I 0.009= , Ruh off Araa`0.-132�a6 # 1 I 1 ■- 1 I I I 1 1 I I 0.008 j',- I I1 1 e--0.002 1 yw.I1l� a} . 1 1 1 1 1 1 1 1 1 1 0.008; i 0.007 j', 1 1 1 1 1 1 1 1 - 1 1 I I I I I I I /�///�. //rte-(�■ ��'----�- ` ±-- --1---1- --{--- --I`-"�---}--�-- 0.007 ', �uncx Depth>&221 I I I 0.006' - I 1 1 1 I 1 1 1 ff 1 1- 1 I 1 1 1 1 1 0:005 '= F1�av tnth=18 1 I I 1 1 1 1 1 qs}q 1 1 1 1 1 0.005'' ■/�_21 1 -+-.I---I---1--}_ 4 I 1 ��< _� 1--_} � 1 0.0041, -Tc-1iS2'nj� (,,f �j1 - 1__L__I J 1 L •�° J 1 L 1 I 0.004;','- � �*5.�� 1 0.003-",' -- - '�' - 1 1 1 1 0.0031', , � I -4 � - o'+� a- 1. 1- J- O 0021 1 1 1 1 I 1 1 1 1 1 I I I 1 I 0.002' - I 1 } + ■ -!-- -- -_ {I FS" �H� ":f' , 1 I 0.001 ' 7 T 1 T T r 1 1 I A' l';,�'..4 ; 0.001 ',- ' ' -' 1 L J 1 _I_ I L L 1 I J 1 L 1 I te' 0.0080 :s'a`d i ' ) 0e.;ZO1`/r'.�`d''44' `!.,l<''. ¢ a`fi 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) 358DALE-PRE-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 6 HydroCAD®8.00 sin 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Link WEST: Inflow Area = 0.333 ac, Inflow Depth > 0.22" Inflow = 0.03 cfs @ 12.39 hrs, Volume= 0.006 af • Primary = 0.03 cfs @ 12.39 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs I Link WEST: Hydrograph 1__L____J__L____J__1_ I 1 I L 1 1 L J I / /�I I 1 ■Inflow _{ • . I _▪ F_ a L_ U I I I 0.03 ch ; ■ o Primary 0.03 I 0.028 --1 of lOI i4'1E' 0 33 3- x.03 ds _ 1 I I I I I I 1 I '3,'. I I , I I I I I I 1 0.026 W'i ▪ r T r r 0.024 I 1 II II j J L J 1 1 L I 1 L J L 0.022? I I I I I I I i I I I I Y S I I I I » 0.018? =. 1 1 1 I 1 ..- 1 I I I I 1 " 3 0.0012-' I I I I I � ., I I I I I 6 -r I r , 11 II I LL 0.014 I I - - +- - I I I I I I ' i I I I I �" I P ,+'-' I - I I I I 0.008- I I I . I I I 1 L J L J 1 I g J L 0.006 ' ,, 0.004 I 1 I I 1 I 1 I I �° 0.002 � '411111r 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) • 358DALE-PRE-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 7 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Link WETLAND: Inflow Area = 1.225 ac, Inflow Depth > 0.22" Inflow = 0.11 cfs @ 12.34 hrs, Volume= 0.023 af Primary = 0.11 cfs @ 12.34 hrs, Volume= 0.023 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Hydrograph I I 1 l I I I I 1 I I I I I I I I - --- _-1_ __r__I__y _ - __r_-I__ - _ r _1 _ - _rI__ - r -__ I I I I I I ■ 1 1 I I I I I I ®Inflow I I 1 1 1 I 1 I I I I I P m I 0.115 I -' + -I- 1 �o.1/da + J n ary ' ' I I I I l�I■�J'��I I I I I I I I I I I I C __1__J__1__L_ __ - L____ _ p .1_-L_-__J--1__L--I__J--L_J-_J___ 0.105- I I I I , I I I --' T r r r 1 - I I ! I I I 0.0957;' I I I I I I I I I I 0.097 / _I__y r__I__y_ �/ - 1 I I I 1 �' 1 1 I 0.085- % 11 11 1 I 1 I- 1 ,. I 11 I I I 1 v ',---1--4--+--1--4--+ --F--1---I--+- S:'., +--F ----4--+--�- -4-- --1--4- - 0.08- . -'- 1 1 1 I N' r 1 1 1 1 I 1 0.075. , 1 1 I 1 I I I ! I 4`pa. I I I I I 1 1 0.07! 1__L_J__1__L__I 1_ 1__L____J__1__L__I__J__L__I__J__ I I I I I 1 1 I v0.065-�/',---r-1--r--r--r -T--r -:- � r- F, T r--- -�--r--r--1-`� r--I-- � I 0— 0.06 - 1 i L I I 1 1 i J 1 L J 1 J y / I I I I I 1 I 1 1 I I I I 00.055: r `r * r r g 0.05'' I I 1 I I I I I I �.,F 1 1 1 1 �f r 0.045.' , ' , - + - + - - J - 4 - I I 1 I I I I gl �( I I I I I I I 0.04- ,' 1 I 1 I 1 I 'V.:..Y I I I I 1 0.035; I J L L J 1- -L-- -J- ',- '-.• _ ' ' I I 1 1 v.,' I 1 I I 1 0.03t\-; , r 1 r T 7', r 0.025' ---'---I I 1 I I d 1 I I 002y 1 T r 1 r r T__r_ I F O .02 I I I I 1 I I I I I 1 I a:hi/S4i;:_-:,,...,;:';:'-',7;,:=-;3 1 1 I 1 1 1 1 1 .,: ' ... ,.„/ 0.005 'ebee:'4"r°". ''s,Itry� ,!e-s E s A.ra AIIIIIIIMIIIIIIIIIIIIIIIr 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) 358DALE-PRE-AEC Type 11124-hr Rainfall=4.50" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A: Runoff = 0.71 cfs @ 12.10 hrs, Volume= 0.068 af, Depth> 0.74" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (ac) CN Description • 1.093 55 Woods, Good, HSG B 1.093 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) cfs) 5.0 50 0.2000 0.17 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.2 135 Total Subcatchment B: Runoff = 0.19 cfs @ 12.16 hrs, Volume= 0.021 af, Depth> 0.74" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (ac) CN Description 0.333 55 Woods, Good, HSG B 0.333 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.1 50 0.0600 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.5 125 0.0640 4.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.6 175 Total Subcatchment C: Runoff = 0.09 cfs @ 12.07 hrs, Volume= 0.008 af, Depth> 0.74" • Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (ac) CN Description 0.132 55 Woods, Good, HSG B 0.132 Pervious Area 358DALE-PRE-AEC Type III 24-hr Rainfall=4.50" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.7 25 0.2400 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.3 80 0.0750 4.41 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 185 Total Link WEST: Inflow Area = 0.333 ac, Inflow Depth > 0.74" Inflow = 0.19 cfs @ 12.16 hrs, Volume= 0.021 of Primary = 0.19 cfs @ 12.16 hrs, Volume= 0.021 af, Atten= 0%, Lag= 0:0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.225 ac, Inflow Depth > 0.74" Inflow = 0.79 cfs @ 12.10 hrs, Volume= 0.076 of Primary = 0.79 cfs @ 12.10 hrs, Volume= 0.076 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • • 358DALE-PRE-AEC Type 111 24-hr Rainfall=5.30" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC • 2/20/2012 Subcatchment A: Runoff = 1.24 cfs @ 12.09 hrs, Volume= 0.103 af, Depth> 1.13" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (ac) CN Description 1.093 55 Woods, Good, HSG B 1.093 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ftl (ft/sec) (cfs) 5.0 50 0.2000 0.17 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.2 135 Total • Subcatchment B: Runoff = 0.33 cfs @ 12.14 hrs, Volume= 0.031 af, Depth> 1.13" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (ac) CN Description 0.333 55 Woods, Good, HSG B 0.333 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) fcfs) 8.1 50 0.0600 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.5 125 0.0640 4.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.6 175 Total Subcatchment C: Runoff = 0.16 cfs @ 12.07 hrs, Volume= 0.012 af, Depth> 1.13" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type Ill 24-hr Rainfall=5.30" Area (ac) CN Description 0.132 55 Woods, Good, HSG B 0.132 Pervious Area 358DALE-PRE-AEC Type III 24-hr Rainfall=5.30" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.7 25 0.2400 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.3 80 0.0750 4.41 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 185 Total Link WEST: Inflow Area = 0.333 ac, Inflow Depth > 1.13" Inflow = 0.33 cfs @ 12.14 hrs, Volume= 0.031 af Primary = 0.33 cfs @ 12.14 hrs, Volume= 0.031 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.225 ac, Inflow Depth > 1.13" • Inflow = 1.39 cfs @ 12.09 hrs, Volume= 0.116 af Primary = 1.39 cfs @ 12.09 hrs, Volume= 0.116 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs 358DALE-PRE-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A: Runoff = 1.61 cfs @ 12.09 hrs, Volume= 0.128 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • Type III 24-hr Rainfall=5.80" Area (ac) CN Description 1.093 55 Woods, Good, HSG B 1.093 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 50 0.2000 0.17 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.2 135 Total Subcatchment B: Runoff = 0.43 cfs @ 12.14 hrs, Volume= 0.039 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (ac) CN Description 0.333 55 Woods, Good, HSG B 0.333 Pervious Area Tc Length Slope Velocity Capacity Description (min) 1feet) fft/ft) (ft/sec) (cfs) 8.1 50 0.0600 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.5 125 0.0640 4.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.6 175 Total Subcatchment C: Runoff = 0.21 cfs @ 12.06 hrs, Volume= 0.015 af, Depth> 1.40" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (ac) CN Description 0.132 55 Woods, Good, HSG B 0.132 Pervious Area • 358DALE-PRE-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.7 25 0.2400 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.3 80 0.0750 4.41 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 185 Total Link WEST: Inflow Area = 0.333 ac, Inflow Depth > 1.40" Inflow = 0.43 cfs @ 12.14 hrs, Volume= 0.039 af Primary = 0.43 cfs @ 12.14 hrs, Volume= 0.039 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.225 ac, Inflow Depth > 1.40" Inflow = 1.81 cfs @ 12.09 hrs, Volume= 0.143 of Primary = 1.81 cfs @ 12.09 hrs, Volume= 0.143 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • 358DALE-PRE-AEC Type III 24-hr Rainfall=6.40" Prepared by ESS Page 1 HydroCAD®8.00 sin 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A: Runoff = 2.09 cfs @ 12.09 hrs, Volume= 0.159 af, Depth> 1.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (ac) CN Description 1.093 55 Woods, Good, HSG B 1.093 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 50 0.2000 0.17 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 5.2 135 Total Subcatchment B: Runoff = 0.56 cfs @ 12.13 hrs, Volume= 0.049 af, Depth> 1.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type Ill 24-hr Rainfall=6.40" Area (ac) CN Description 0.333 55 Woods,_Good, HSG B 0.333 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.1 50 0.0600 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.5 125 0.0640 4.07 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 8.6 175 Total Subcatchment C: Runoff = 0.27 cfs @ 12.06 hrs, Volume= 0.019 af, Depth> 1.75" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type Ill 24-hr Rainfall=6.40" Area (ac) CN Description 0.132 55 Woods, Good, HSG B 0.132 Pervious Area 358DALE-PRE-AEC Type 111 24-hr Rainfall=6.40" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 2.7 25 0.2400 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.3 80 0.0750 4.41 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 185 Total Link WEST: Inflow Area = 0.333 ac, Inflow Depth > 1.75" Inflow = 0.56 cfs @ 12.13 hrs, Volume= 0.049 of Primary = 0.56 cfs @ 12.13 hrs, Volume= 0.049 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.225 ac, Inflow Depth > 1.75" Inflow = 2.34 cfs @ 12.09 hrs, Volume= 0.179 of Primary = 2.34 cfs @ 12.09 hrs, Volume= 0.179 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • A ROOF it 4 B' (A) N ,----\___. WETLAND 7 .---N_____ 0 <DW> 0 AL Subcat Reach 'on. Drainage Diagram for 358DALE-POST-AEC Prepared by ESS 2/20/2012 HydroCAD®8.00 s/n 004178 ®2006 HydroCAD Software Solutions LLC 358DALE-POST-AEC Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HYdroCAD Software Solutions LLC 2/20/2012 Area Listing (all nodes) Area (acres) CN Description (subcats1 1.194 55 Woods, Good, HSG B (A',B',C') 0.273 61 >75% Grass cover, Good, HSG B (A',B',C') • 0.085 98 Paved parking & roofs (DW,ROOF) 1.552 • 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 3 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A': Runoff = 0.11 cfs @ 12.36 hrs, Volume= 0.023 af, Depth> 0.25" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (ac) CN Description 0.992 55 Woods, Good, HSG B 0.100 61 >75% Grass cover, Good, HSG B 1.092 56 Weighted Average 1.092 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 20 0.0580 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 5.8 30 0.0500 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 135 Total Subcatchment A': Hydrograph J__1__L__L__I__J__ __1__ _____I__ __1__1__1_-_I___I__ __1_ _L__I__. I I I I I I I I I I I I I 1 I 0.125: , __,-- --,--T--r- I T r I 1 T r I I 1 1 T r I 0 Runoff 1__L_-_____J__ __1__L__1_--1J--11 __II-__I_-1-_1_-L I I 0.11 da i 0.115=! �T■Iy T r r T r 1 1 1 7 T ` !k> 0.1054-; 1 1�AIr r 1 , -r r r 1 1 , T r 0.09$ ' -- + r -1--, , * 7 1 I -y *- 0.09- --Ru io'f-Are-ai-t-O9-2'ac v --- 1 ^ I ----1--0.0 8 5- I---1- --+- F--F- 1--H--i--+--F 0.08 c. off yo)u610=0.02$at �a w 0.075 1 I 0.07 - R uyA f b e pt Ii›.:t 0.065 -- I I 1 1 1 1 c 0.06 �ry `-,, , �r p1 , T I , x 0.055 a�YK J�$p �1 � v1 J 1 L !1 J 1 I 1 1 1 I 0.05 -- --I 18- '+Y�'�'`/� Q � �__ 0.045 ,--ii c�` {�-mi I I I I 1 1 I 0.04 ^ 0.035 - ���IY 1 --'- � I I 1 I I I I ■ 1 I 0.03 �� + ■ 1 I 1 I I I I 0.025 ,- I 1 I I I I I I I I I I 0.02- ,- - -- --~--1---I-- --1--H - 1- � N��, I J i- 11111111111 „0.015 I` " � ;�_`^* o(7 , I 1 L L I 4 J 1 L 1 1 I I J '<d ✓'" �'rL,C 4_ 1 1 1 1 1 1 1 1 1 1 1 I I 1 0.000. 4/7/ //'.ss:4Ji✓J/i X/74,6i .:,'��*. - 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) • 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 4 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment B': Runoff = 0.04 cfs @ 12.12 hrs, Volume= 0.006 af, Depth> 0.31" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (ac) CN Description 0.120 61 >75% Grass cover, Good, HSG B 0.100 55 Woods, Good, HSG B 0.220 58 Weighted Average 0.220 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) Ift/sec) (cfs) 3.7 50 0.0580 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 50 0.0600 3.94 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps • 3.9 100 Total Subcatchment B': Hydrograph I I I :I I I I I I I I 1 1 1__I I I _1 +_ _ _ __ 1 L .a 1 I I I J I 1 I i 1 1 I L a Runoff ' ' --- I I ' 1 I I I 1 1 0.032' z - Rai tfatf= 0"1 + -_-_r 0.03 _ -I- I r r -h I 1 r 1 I 0.028 Ruy1Q#ArQa=V.-22- 'ad k 1 I I ,- + I I - 1 -- -r 7 T r 1 0.026 -/.� - ; = +- -+ ��.�y(��n�[y�' m I I 0.024 11111. ff YOURx 0-406�'` I , r r T w 0.0223'__R afFbepth>2f-.31�` vv r r , , ; ? r --T v 1 1 I I 1 1 1 I I 0.02 7 r r 1 1 T r illA r 1 r I 0.01$4' __F1oW 1Length-111-r ,,;t. r r I I 1 T r 1 r o.olsi 1 1 1 �'`/-_ 1- 1 -r-min_ '1 r r r r I 1--T r 7 r 0.014 __l_c=_3 I9_mi� I r � 1 T r 1 ��y'r' 4 4 1 11 r 0.012= I I 14, 1 1 I 1 1 1 �N=68_ T-- i T r i4� ,,,, r 1 I 1 T r '1 1 T 0'01 ���,,,/// T i 1 T r -#'4 �m ■ I 1 T r I 1 T r 0.008 _ 7T 1 T r -I- -r- 4:gg1 1 T r 1 4 1' 0.0069' _ 1 1 1 ■ .4, } m 1 1 0.004 , 1 1 ° . a 1`'M ^ ' , 0.002 I I 1 1 I 1 � 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) 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 5 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C': Runoff = 0.02 cfs @ 12.29 hrs, Volume= 0.004 af, Depth> 0.28" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" • Area (ac) CN Description 0.102 55 Woods, Good, HSG B 0.053 61 >75% Grass cover, Good, HSG B • 0.155 57 Weighted Average 0.155 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 60 0.0600 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 100 0.0800 4.55 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.9 240 Total Subcatchment C': Hydrograph I I I I I I I I f 1 1 ■ 1 1 ■ I J 1 1 1 1 1 4 J 1 L 1 1 1 1 • I L I 1 I 1 Runoff 0.021:' ______1__i__t__N____y__t__f__1_____y__}__r__I___I__y__.,__r__I_____I__t 0.02^ �qq1 T T.. .1 . 1 1 r r ,� -i r T r T T 0.019^ -- yI' iHI; r y ■ 1 1 0.0181 - I Rai ma[K- 1 Y J J. 1 i414 1 L J L 1 1 I I I I I I I I I I I I I I , I I I 0.016- -- -y■^-■l/�� r�/�y■pP- .G) /A� r r 1 r r r r -RUBS tea^1.-1§-5,ad jb - 1 1 1 1 1 1 1 0.015 ' -- r TTT r A`d r r r F 3: 1 1 I 0.014, 1A �y11 y7Qlu1 ' 00O4 7a1- 1 1 L 1 1 .� 0.0131 ( 0.012= i =Runoff be-pth &.28k` - - g 1 � � a - 0.011= F1ow�L ngth-=24© f i '_____T 1 1 0.01, r, 1 u 0.009' I I `. 0.008-',--T ry-1--'--1 L 1 1 p' L 1 1 L 1 0.007 =AA r__r__I__y__, r �__r .1...,,......_t I I I 1 1 I I I I I 0.006^�' - T 1 T r -- , °'.-. 1 1 T F 1 r 1 1 1 't 0.005',' I g¢T4ex„ 1 1 I I 1 1 1 0.004i', I J L L L I L 1 1 L � I I I I I I I I I I ��� I I 0.002 1 i ; ;0.002;' , r r r i A r,r"fi � d- T r 0.001-' 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) 358DALE-POST-AEC Type III 24-hr•Rainfall=3.10" Prepared by ESS Page 6 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment DW: Runoff = 0.15 cfs @ 12.02 hrs, Volume= 0.010 af, Depth> 2.87" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (sf) CN Description 1,900 98 Paved parking & roofs 1,900 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment DW: Hydrograph / I I I I 1 I I I 1 I I I 7 I I 1 7 r 7 T r -1/ 1 T T r ©' Runoff 0.16= 1 I I I I I 1 I 1 I I I I ___1___1__H__-__r__r____H__y__+-i 0.15c1s I____-,__+__+_ _F_______i_- _ (115i:' YM G 11' 1 2 J J 1 1 L I ._ J I 1 ; J I 1 I L 0.14 I 1 1 I I 1 1 0.13:'/ Rai nfa lr:3.10 n I I 1 I1 1 I I 0.12%' --Runoff Area=iy-900-f,- L � L i � 1 1 I I I I I I I 1 1 I I I 011= --Ru>nafif- Voiu�ne= .d10 at 1 1 1 I I I I I I 1 --Y--r-- --1--ti--y--+- r z ---- -- - r--r 7 T r Runoff_Qepthty2.$7''__ _ i 0.09=. V I I I 1 I I I I I 'q'q` 0 0.08=' 1 ¢? 1 1 I LL T-c .10 X1'11 n 1 I 1 1 i-::. I I I I 0.07--'' I I 1 1 1 I I 1 I I I I I I I I 1 r r r r r r Z r r 0.06-: GN=918 I -! 1 ,_ J .. LSE �A J 1 1 1 L. 0.05:7- I I I I 1 1 I �- I I I I I I I I 1 I I I I I I 0.04?' 1 1 1 -'1 1 1 1 r r 0.03 . 1 1 I I I I " '24^ I I I 0.02 1 I ■ I I I I ,ds� I I I I I ■ 0.01-i'-' I 1 '•"."". 4ftl�'.? ? rah: y:::,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) 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 7 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 1 Subcatchment ROOF: Runoff = 0.14 cfs @ 12.02 hrs, Volume= 0.010 af, Depth> 2.87" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=3.10" Area (sf) CN Description 1,800 98 Paved parking & roofs 1,800 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment ROOF: Hydrograph / I I I I I I I I I I I I I I I I I I / I I I I I 1 1 1 1 I 1 I I I I I p Runoff 0.15-:-' 2 I Lo.,4 cis( - y 24 r------- --*--h ± ``. ----y I I ■ 1 I I 0.14 ��� '�I -�I °13i ,.. I I ,rly I I I I I I I -Rai nfa II 3 1-0" I I I 0.12-? I I I I I I I I z,: I I _ 0.11 130glff 1ar0a^1 8©� tf 1 Lr it J 1 L 1 1 1 0.1 Ru_If VO1'ume O.O1Oat - I 11 ri1, I I I 1 1 1 1 1 1 I 0.09.: Runoff Depth>2.$7" 1 0.08.' ■ ■ 1 1 1 t 1 C _ 1 I 4ppp9 I 1 1 1 LL 0.07' Tc:-.1.0 t`ti l f1 1 I I -# om ———— - } - } 0.06- _YN V8 1 N � } I- 1 a ',' 0.05=' I I I I 1 1 I I I 1 I 1 T r 1 1 1 €R� 1 T r r 1 t 0.04-'/ 1 'x' ; 1 1 1 1 _ 1 1 11 ". „ 1 1 1 1 I • / I 1 I 1 1 1 Y 1 1 1 t I 1 0.03 ' p e� 1 '.� I 0'02 '_ 1 L _L_ __-1__J _ ._ �`,, J 1 1 1 J 1 0. 0.01 ' I wt ?_' ,` +'$ 9° ?"/',x, A(/,,r,a°&:�ga 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) • 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 8 HydroCADe 8.00 sin 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Pond BASE: Inflow Area = 0.044 ac, Inflow Depth > 2.87" Inflow = 0.15 cfs @ 12.02 hrs, Volume= 0.010 of Outflow = 0.04 cfs @ 12.29 hrs, Volume= 0.010 af, Atten= 72%, Lag= 16.7 min Discarded = 0.03 cfs @ 12.29 hrs, Volume= 0.010 of Primary = 0.01 cfs @ 12.29 hrs, Volume= 0.000 of Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 196.44' @ 12.29 hrs Surf.Area= 1,375 sf Storage= 79 cf Flood Elev= 198.00' Surf.Area= 1,375 sf Storage= 715 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 9.8 min ( 762.2- 752.4 ) Volume Invert Avail.Storage Storage Description #1 196.30' 715 cf 25.00'W x 55.00'L x 1.30'H Stone 1,788 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.40' 4.0"Vert. Orifice/Grate X 3 rows with 120.0" cc spacing C= 0.600 #3 Primary 196.40' 4.0" x 100.0' long Culvert Ke= 0.500 Outlet Invert= 194.90' S= 0.0150 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.03 cfs @ 12.29 hrs HW=196.44' (Free Discharge) L = (Exfiltration Controls 0.03 cfs) Exfiltration ( a ) Primary OutFlow Max=0.01 cfs @ 12.29 hrs HW=196.44' (Free Discharge) -2=Orifice/Grate (Orifice Controls 0.00 cfs @ 0.71 fps) 3=Culvert (Barrel Controls 0.00 cfs @ 1.05 fps) • 358DALE-POST-AEC Type lii 24-hr Rainfall=3.10" Prepared by ESS Page 9 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Pond BASE: Hydrograph 1 1 1 1 1 f 1 1 ®Inflow 0.15 cfs I -inflow Area 0;844-ac : 358DALE-POST-AEC Type III 24-hr. Rainfall=3.10" Prepared by ESS Page 10 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Pond CLTC: Inflow Area = 0.041 ac, Inflow Depth > 2.87" Inflow = 0.14 cfs @ 12.02 hrs, Volume= 0.010 af Outflow = 0.01 cfs @ 12.86 hrs, Volume= 0.010 af, Atten= 92%, Lag= 50.9 min Discarded = 0.01 cfs @ 12.86 hrs, Volume= 0.010 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 194.01' @ 12.86 hrs Surf.Area= 384 sf Storage= 156 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 104.4 min ( 856.8- 752.4 ) Volume Invert Avail.Storage Storage Description #1 193.00' 339 cf 12.00'W x 32.00'L x 2.50'H Stone 960 cf Overall - 112 cf Embedded = 848 cf x 40.0% Voids #2 194.00' 112 cf 32.1"W x 12.0"H x 7.50'L Cultec C-100 x 8 Inside#1 451 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.50' 4.0"Vert. Orifice/Grate X 2.00 columns X 2 rows with 36.0" cc spacing C= 0.600 Discarded OutFlow Max=0.01 cfs @ 12.86 hrs HW=194.01' (Free Discharge) t-1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=193.00' (Free Discharge) t-2=Orifice/Grate ( Controls 0.00 cfs) • 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 11 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Pond CLTC: Hydrograph • r- --r- --r--i--r-;--r-;--r-;--r-,--r-�--r----r-�--r-,--r-r-- in Inflow ' i , , � 10.1 dal- Out110W / _ '__r_ '__r__ '__' ' _r_w'__r y--F_y__r____r_,__r_y__r_y__ ' ' hnfiow Atea=0.04tac -+ . , --+ , ■Discarded ' �--�--+--�--�-- Primary 015-! ',z ,'} Fea14 E1e'v l9-4.01"L_J 0.14 - c 0.13=' ' . ' ---Stir�e=1-56 ct 0.12-' , 0.11' i r r 1 - - - - r r r I-1 r v O O6� ' L_J__L_J__L_-I-_L_J__L_J C 0.07 -_J L L i L L i L L L L IL `' ' 0.06=' 0.05=' r 0.04 r r 0.03=' f i''01 II cf!0.;.;0 'We./ /.//.e'��r° ,_*'r.�.... O 02=' ,.:!.,F/en�i`.<':G`��.A.r°..-:x. ,;','/J -'.,f 0..00;0. „ ..., , .. - . O Csre`�.�m%e%sv t.-,��:a ..F�..fl�a s'e.€f.✓,,,,.a's;a"1_ J_ o �.%tn a'1:c--: .,�<! �` rs 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) 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 12 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Link WEST: Inflow Area = 0.220 ac, Inflow Depth > 0.31" Inflow = 0.04 cfs @ 12.12 hrs, Volume= 0.006 of Primary = 0.04 cfs @ 12.12 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WEST: Hydrograph / ■Inflow I o.04 els 0.038= f Prima r�I-�'- -�--r----,-- r r I- 0.036-z-' ' Inf low Area-=0 22o 004: ;, r r 1 r � r 0.034 - 1 ;:;: 0.032=' I eP , 0.03 i F`^ 0.028 :5.`' I x 0.026?'' {-F-' 1 L , L 1 L_ _J__L____J-_1 ". 0.024;, • i 0.022 / I 0.02' 3 • 0 0.018 " ___ __r____ __ r _ ___1__r_ r r 7 r 1 r 0.016?' , ■ 0.014—' 0.012- p. 0.01. I I / 0.008_i ___1__L____J__L__ __J__1 1__L____J 0.006 ; • 0.004 / 0.002—/ ,. AIMIIIIMIIIImmiaeV 0 e NF_ �F .+:.'1Rrovf x'`,/,'',-.1:-. ..da,rb .._ 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) • 358DALE-POST-AEC Type III 24-hr Rainfall=3.10" Prepared by ESS Page 13 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Link WETLAND: Inflow Area = 1.247 ac, Inflow Depth > 0.25" Inflow 0.13 cfs @ 12.35 hrs, Volume= 0.026 af Primary == 0.13 cfs @ 12.35 hrs, Volume= 0.026 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Hydrograph I I I I I I I I I I I I I I I I ! I I I 1 I ®Inflow - -- - --' ------ --i--10.13ds�+--1-----�--i-- ----�-- -----� ._ QPrimary 0.14- !! i 1 I I 1 013 dsi I 1 I 1 1 I I 0.13 I 1 1 1 Wk;;at 1 1 1 1 1 J L J 1 L J I y°?., 1__L____J 1__L J L J 0,12 � � I I I I I I I ■ �•,�'��� I 1 I ■ I I I I • I I I I I t ^, 1 I I 1 0.11 ' ---'l--T r-1 T r----1--T- „1F9 T--r----1--T--r-----1--r-'---1 ' J--1 1 I____J__I_ (n. 1 L____J__L L____J L_ _J 1 1 1 I 1 ■ el - I I T In 0.09?' ! 1-- -- ----l--r----1-- 1 i 1 1 1 - - 1 1 I I I I 1 I 1 I I 1 , 0.06 1 1 1 1 1 I I i I I 1 I I I I 1 1 I 1 1 1 � 0.077' ! r r r r____y__r_ ; __r____y__r__r____-1,__r 1 1 1 I 1 1 1 1 1 I LL 'y 1 1 I 1 1 1 1 I 1 1 I 1 I 0.061 , I 1 1 1 1 1 1 ' I I I I I 1 I L I I I I I I 0.05 r r -1 - ti r y r I 1 A 1 1 1 1 y_ _ 1 1 1 1 1 � 1 1 1 1 1 1 0.047 J 1 1 1 1 1 1 -1 0.03- I I 1 1 I I �' I I I I I I I I I d M 0.02 I I 1 1 I 1 1 1 �_ _ 1 1 1 1 1 1 1 1 1 1 0.01 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) 358DALE-POST-AEC Type III 24-hr Rainfall=4.50" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A': • Runoff = 0.71 cfs @ 12.14 hrs, Volume= 0.072 af, Depth> 0.79" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (ac) CN Description 0.992 55 Woods, Good, HSG B 0.100 61 >75% Grass cover, Good, HSG B 1.092 56 Weighted Average 1.092 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 20 0.0580 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 5.8 30 0.0500 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 135 Total Subcatchment B': Runoff = 0.20 cfs @ 12.08 hrs, Volume= 0.017 af, Depth> 0.90" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type Ill 24-hr Rainfall=4.50" Area (ac) CN Description 0.120 61 >75% Grass cover, Good, HSG B 0.100 55 Woods, Good, HSG B 0.220 58 Weighted Average 0.220 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 50 0.0580 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 50 0.0600 3.94 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.9 100 Total 358DALE-POST-AEC Type 111 24-hr Rainfall=4.50" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C': Runoff = 0.13 cfs @ 12.09 hrs, Volume= 0.011 af, Depth> 0.85" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (ac) CN Description 0.102 55 Woods, Good, HSG B 0.053 61 >75% Grass cover, Good, HSG B 0.155 57 Weighted Average 0.155 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 60 0.0600 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 100 0.0800 4.55 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.9 240 Total Subcatchment DW: Runoff = 0.22 cfs @ 12.02 hrs, Volume= 0.015 af, Depth> 4.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (sf) CN Description 1,900 98 Paved parking & roofs 1,900 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment ROOF: Runoff = 0.21 cfs @ 12.02 hrs, Volume= 0.015 af, Depth> 4.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=4.50" Area (sf) CN Description 1,800 98 Paved parking & roofs 1,800 Impervious Area • 358DALE-POST-AEC Type 11124-hr Rainfall=4.50" Prepared by ESS Page 3 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Pond BASE: Inflow Area = 0.044 ac, Inflow Depth > 4.26" Inflow = 0.22 cfs @ 12.02 hrs, Volume= 0.015 af Outflow = 0.09 cfs @ 12.13 hrs, Volume= 0.016 af, Atten= 58%, Lag= 7.2 min Discarded = 0.03 cfs @ 12.13 hrs, Volume= 0.013 af Primary = 0.06 cfs @ 12.13 hrs, Volume= 0.002 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 196.51' @ 12.13 hrs Surf.Area= 1,375 sf Storage= 117 cf Flood Elev= 198.00' Surf.Area= 1,375 sf Storage= 715 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 10.8 min ( 755.9- 745.2 ) Volume Invert Avail.Storage Storage Description #1 196.30' 715 cf 25.00'W x 55.00'L x 1.30'H Stone 1,788 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.40' 4.0"Vert. Orifice/Grate X 3 rows with 120.0" cc spacing C= 0.600 #3 Primary 196.40' 4.0" x 100.0' long Culvert Ke= 0.500 Outlet Invert= 194.90' S= 0.0150 'P Cc= 0.900 • n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.03 cfs @ 12.13 hrs HW=196.51' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.06 cfs @ 12.13 hrs HW=196.51' (Free Discharge) t=Orifice/Grate (Orifice Controls 0.03 cfs @ 1.14 fps) =Culvert (Inlet Controls 0.03 cfs @ 1.14 fps) Pond CLTC: Inflow Area = 0.041 ac, Inflow Depth > 4.26" Inflow = 0.21 cfs @ 12.02 hrs, Volume= 0.015 af Outflow = 0.01 cfs @ 13.36 hrs, Volume= 0.015 af, Atten= 94%, Lag= 80.6 min Discarded = 0.01 cfs @ 13.36 hrs, Volume= 0.015 of Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 194.46' @ 13.36 hrs Surf.Area= 384 sf Storage= 265 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time 182.1 min (927.3- 745.2 ) 358DALE-POST-AEC Type III 24-hr Rainfall=4.50" Prepared by ESS Page 4 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Volume Invert Avail.Storage Storage Description #1 193.00' 339 cf 12.00'W x 32.00'L x 2.50'H Stone 960 cf Overall - 112 cf Embedded = 848 cf x 40.0%Voids #2 194.00' 112 cf 32.1"W x 12.0"H x 7.50'L Cultec C-100 x 8 Inside#1 451 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.50' 4.0"Vert. Orifice/Grate X 2.00 columns X 2 rows with 36.0" cc spacing C= 0.600 Discarded OutFlow Max=0.01 cfs @ 13.36 hrs HW=194.46' (Free Discharge) t-1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=193.00' (Free Discharge) t_2=Orifice/Grate (Controls 0.00 cfs) Link WEST: Inflow Area = 0.220 ac, Inflow Depth > 0.90" Inflow = 0.20 cfs @ 12.08 hrs, Volume= 0.017 of Primary = 0.20 cfs @ 12.08 hrs, Volume= 0.017 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: = Inflow Depth > 0.8 " Inflow Area 1.247 ac, In w ep 0 Inflow = 0.83 cfs @ 12.13 hrs, Volume= 0.083 af Primary = 0.83 cfs @ 12.13 hrs, Volume= 0.083 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • 358DALE-POST-AEC Type III 24-hr Rainfall=5.30" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 0 2/20/2012 Subcatchment A': Runoff = 1.22 cfs @ 12.13 hrs, Volume= 0.109 af, Depth> 1.20" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (ac) CN Description 0.992 55 Woods, Good, HSG B 0.100 61 >75% Grass cover, Good, HSG B 1.092 56 Weighted Average 1.092 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 20 0.0580 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 5.8 30 0.0500 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 135 Total Subcatchment B': Runoff = 0.33 cfs @ 12.07 hrs, Volume= 0.024 af, Depth> 1.34" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (ac) CN Description 0.120 61 >75% Grass cover, Good, HSG B 0.100 55 Woods, Good, HSG B 0.220 58 Weighted Average 0.220 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 50 0.0580 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 50 0.0600 3.94 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.9 100 Total • 358DALE-POST-AEC Type III 24-hr Rainfall=5.30" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C': Runoff = 0.21 cfs @ 12.09 hrs, Volume= 0.016 af, Depth> 1.27" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (ac) CN Description 0.102 55 Woods, Good, HSG B 0.053 61 >75% Grass cover, Good, HSG B 0.155 57 Weighted Average 0.155 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 60 0.0600 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 100 0.0800 4.55 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.9 240 Total Subcatchment DW: Runoff = 0.26 cfs @ 12.02 hrs, Volume= 0.018 af, Depth> 5.06" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (sf) CN Description 1,900 98 Paved parking & roofs 1,900 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment ROOF: Runoff = 0.25 cfs @ 12.02 hrs, Volume= 0.017 af, Depth> 5.06" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.30" Area (sf) CN Description 1,800 98 Paved parking & roofs 1,800 Impervious Area 358DALE-POST-AEC Type III 24-hr Rainfall=5.30" Prepared by ESS Page 3 HydroCAD®8.00 sin 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Pond BASE: Inflow Area = 0.044 ac, Inflow Depth > 5.06" • Inflow = 0.26 cfs @ 12.02 hrs, Volume= 0.018 af Outflow = 0.13 cfs @ 12.11 hrs, Volume= 0.018 af, Atten= 50%, Lag= 5.8 min Discarded = 0.03 cfs @ 12.11 hrs, Volume= 0.015 af Primary = 0.10 cfs @ 12.11 hrs, Volume= 0.003 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 196.55' @ 12.11 hrs Surf.Area= 1,375 sf Storage= 135 cf Flood Elev= 198.00' Surf.Area= 1,375 sf Storage= 715 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 10.6 min ( 753.1 -742.4 ) Volume Invert Avail.Storage Storage Description #1 196.30' 715 cf 25.00'W x 55.00'L x 1.30'H Stone 1,788 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.40' 4.0"Vert. Orifice/Grate X 3 rows with 120.0" cc spacing C= 0.600 #3 Primary 196.40' 4.0" x 100.0' long Culvert Ke= 0.500 Outlet Invert= 194.90' S= 0.0150 7' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.03 cfs @ 12.11 hrs HW=196.55' (Free Discharge) 1-1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.09 cfs @ 12.11 hrs HW=196.55' (Free Discharge) -2=Orifice/Grate (Orifice Controls 0.05 cfs @ 1.30 fps) 3=Culvert (Inlet Controls 0.05 cfs @ 1.30 fps) Pond CLTC: Inflow Area = 0.041 ac, Inflow Depth > 5.06" Inflow = 0.25 cfs @ 12.02 hrs, Volume= 0.017 af Outflow = 0.01 cfs @ 13.64 hrs, Volume= 0.016 af, Atten= 95%, Lag= 97.8 min Discarded = 0.01 cfs @ 13.64 hrs, Volume= 0.016 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 194.78' @ 13.64 hrs Surf.Area= 384 sf Storage= 334 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 177.7 min ( 920.1 -742.4) 358DALE-POST-AEC Type III 24-hr.Rainfall=5.30" Prepared by ESS Page 4 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Volume Invert Avail.Storage Storage Description #1 193.00' 339 cf 12.00'W x 32.00'L x 2.50'H Stone 960 cf Overall - 112 cf Embedded = 848 cf x 40.0% Voids #2 194.00' 112 cf 32.1"W x 12.0"H x 7.50'L Cultec C-100 x 8 Inside#1 451 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.50' 4.0"Vert. Orifice/Grate X 2.00 columns X 2 rows with 36.0" cc spacing C= 0.600 Discarded OutFlow Max=0.01 cfs @ 13.64 hrs HW=194.78' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) • Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=193.00' (Free Discharge) L2=Orifice/Grate (Controls 0.00 cfs) Link WEST: Inflow Area = 0.220 ac, Inflow Depth > 1.34" Inflow = 0.33 cfs @ 12.07 hrs, Volume= 0.024 of Primary = 0.33 cfs @ 12.07 hrs, Volume= 0.024 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.247 ac, Inflow Depth > 1.21" Inflow = 1.41 cfs @ 12.12 hrs, Volume= 0.125 af Primary = 1.41 cfs @ 12.12 hrs, Volume= 0.125 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • 358DALE-POST-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 1 HydroCAD 8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A': Runoff = 1.57 cfs @ 12.13 hrs, Volume= 0.134 af, Depth> 1.48" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (ac) CN Description 0.992 55 Woods, Good, HSG B 0.100 61 >75% Grass cover, Good, HSG B 1.092 56 Weighted Average 1.092 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 20 0.0580 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 5.8 30 0.0500 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 135 Total Subcatchment B': Runoff = 0.42 cfs @ 12.07 hrs, Volume= 0.030 af, Depth> 1.63" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (ac) CN Description 0.120 61 >75% Grass cover, Good, HSG B 0.100 55 Woods, Good, HSG B 0.220 58 Weighted Average 0.220 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 50 0.0580 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 50 0.0600 3.94 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.9 100 Total 358DALE-POST-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C': Runoff = 0.26 cfs @ 12.09 hrs, Volume= 0.020 af, Depth> 1.55" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (ac) CN Description 0.102 55 Woods, Good, HSG B 0.053 61 >75% Grass cover, Good, HSG B 0.155 57 Weighted Average 0.155 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 60 0.0600 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 100 0.0800 4.55 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.9 240 Total Subcatchment DW: Runoff = 0.28 cfs @ 12.02 hrs, Volume= 0.020 af, Depth> 5.56" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=5.80" Area (sfl CN Description 1,900 98 Paved parking & roofs 1,900 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ftt (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment ROOF: Runoff = 0.27 cfs @ 12.02 hrs, Volume= 0.019 af, Depth> 5.56" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs • Type III 24-hr Rainfall=5.80" Area (sf) CN Description 1,800 98 Paved parking & roofs 1,800 Impervious Area 358DALE-POST-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 3 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Pond BASE: Inflow Area = 0.044 ac, Inflow Depth > 5.56" Inflow = 0.28 cfs @ 12.02 hrs, Volume= 0.020 af Outflow = 0.15 cfs @ 12.10 hrs, Volume= 0.020 af, Atten= 46%, Lag= 5.2 min Discarded = 0.03 cfs @ 12.10 hrs, Volume= 0.016 af Primary = 0.12 cfs @ 12.10 hrs, Volume= 0.004 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 196.57' @ 12.10 hrs Surf.Area= 1,375 sf Storage= 146 cf Flood Elev= 198.00' Surf.Area= 1,375 sf Storage= 715 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 10.8 min ( 751.8- 741.0) Volume Invert Avail.Storage Storage Description #1 196.30' 715 cf 25.00'W x 55.00'L x 1.30'H Stone 1,788 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.40' 4.0"Vert. Orifice/Grate X 3 rows with 120.0" cc spacing C= 0.600 #3 Primary 196.40' 4.0" x 100.0' long Culvert Ke= 0.500 Outlet Invert= 194.90' S= 0.0150 '/' Cc=0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.03 cfs @ 12.10 hrs HW=196.56' (Free Discharge) ..1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.12 cfs @ 12.10 hrs HW=196.56' (Free Discharge) t2=Orifice/Grate (Orifice Controls 0.06 cfs @ 1.38 fps) 3=Culvert (Inlet Controls 0.06 cfs @ 1.38 fps) Pond CLTC: Inflow Area = 0.041 ac, Inflow Depth > 5.56" Inflow = 0.27 cfs @ 12.02 hrs, Volume= 0.019 af Outflow = 0.01 cfs @ 13.76 hrs, Volume= 0.017 af, Atten= 95%, Lag= 104.8 min Discarded = 0.01 cfs @ 13.76 hrs, Volume= 0.017 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-lnd method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 195.03' @ 13.76 hrs Surf.Area= 384 sf Storage= 379 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 175.0 min ( 916.0- 741.0) 358DALE-POST-AEC Type III 24-hr Rainfall=5.80" Prepared by ESS Page 4 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Volume Invert Avail.Storage Storage Description #1 193.00' 339 cf 12.00W x 32.00'L x 2.50'H Stone 960 cf Overall- 112 cf Embedded = 848 cf x 40.0%Voids #2 194.00' 112 cf 32.1"W x 12.0"H x 7.50'L Cultec C-100 x 8 Inside#1 451 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.50' 4.0"Vert. Orifice/Grate X 2.00 columns X 2 rows with 36.0"cc spacing C= 0.600 Discarded OutFlow Max=0.01 cfs @ 13.76 hrs HW=195.03' (Free Discharge) t-1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=193.00' (Free Discharge) t-2=Orifice/Grate (Controls 0.00 cfs) Link WEST: Inflow Area = 0.220 ac, Inflow Depth > 1.63" . Inflow = 0.42 cfs @ 12.07 hrs, Volume= 0.030 af Primary = 0.42 cfs @ 12.07 hrs, Volume= 0.030 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.247 ac, Inflow Depth > 1.49" Inflow = 1.81 cfs @ 12.12 hrs, Volume= 0.154 of Primary = 1.81 cfs @ 12.12 hrs, Volume= 0.154 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs I 358DALE-POST-AEC Type III 24-hr Rainfall=6.40" Prepared by ESS Page 1 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment A': Runoff = 2.02 cfs @ 12.12 hrs, Volume= 0.167 af, Depth> 1.83" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (ac) CN Description 0.992 55 Woods, Good, HSG B 0.100 61 >75% Grass cover, Good, HSG B 1.092 56 Weighted Average 1.092 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.8 20 0.0580 0.19 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 5.8 30 0.0500 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.10" 0.2 85 0.1800 6.83 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 7.8 135 Total Subcatchment B': Runoff = 0.52 cfs @ 12.07 hrs, Volume= 0.037 af, Depth> 2.01" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (ac) CN Description 0.120 61 >75% Grass cover, Good, HSG B 0.100 55 Woods, Good, HSG B 0.220 58 Weighted Average 0.220 Pervious Area • Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 50 0.0580 0.22 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.2 50 0.0600 3.94 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.9 100 Total 358DALE-POST-AEC Type III 24-hr Rainfall=6.40" Prepared by ESS Page 2 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Subcatchment C': Runoff = 0.34 cfs @ 12.08 hrs, Volume= 0.025 af, Depth> 1.92" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (ac) CN Description 0.102 55 Woods, Good, HSG B 0.053 61 >75% Grass cover, Good, HSG B 0.155 57 Weighted Average 0.155 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 60 0.0600 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.10" 0.4 100 0.0800 4.55 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.2 80 0.2000 7.20 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.9 240 Total Subcatchment DW: • Runoff = 0.31 cfs @ 12.02 hrs, Volume= 0.022 af, Depth> 6.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (sf) CN Description 1,900 98 Paved parking & roofs 1,900 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment ROOF: Runoff = 0.30 cfs @ 12.02 hrs, Volume= 0.021 af, Depth> 6.16" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Type III 24-hr Rainfall=6.40" Area (sf) CN Description 1,800 98 Paved parking & roofs 1,800 Impervious Area 358DALE-POST-AEC Type III 24-hr•Rainfall=6.40" Prepared by ESS Page 3 HydroCAD®8.00 s/n 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) {ft/sec) (cfs) 1.0 Direct Entry, Pond BASE: Inflow Area = 0.044 ac, Inflow Depth > 6.16" Inflow = 0.31 cfs @ 12.02 hrs, Volume= 0.022 af Outflow = 0.18 cfs @ 12.10 hrs, Volume= 0.022 af, Atten=42%, Lag=4.8 min Discarded = 0.03 cfs @ 12.10 hrs, Volume= 0.018 af Primary = 0.15 cfs @ 12.10 hrs, Volume= 0.005 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 196.59' @ 12.10 hrs Surf.Area= 1,375 sf Storage= 158 cf • Flood Elev= 198.00' Surf.Area= 1,375 sf Storage= 715 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 10.6 min ( 750.1 - 739.5 ) Volume Invert Avail.Storage Storage Description #1 196.30' 715 cf 25.00'W x 55.00'L x 1.30'H Stone 1,788 cf Overall x 40.0% Voids Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.40' 4.0"Vert. Orifice/Grate X 3 rows with 120.0" cc spacing C= 0.600 #3 Primary 196.40' 4.0" x 100.0' long Culvert Ke= 0.500 Outlet Invert= 194.90' S= 0.0150'/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior Discarded OutFlow Max=0.03 cfs @ 12.10 hrs HW=196.59' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.15 cfs @ 12.10 hrs HW=196.59' (Free Discharge) 'E2=Orifice/Grate (Orifice Controls 0.07 cfs @ 1.47 fps) 3=Culvert (Inlet Controls 0.07 cfs @ 1.47 fps) Pond CLTC: Inflow Area = 0.041 ac, Inflow Depth > 6.16" Inflow = 0.30 cfs @ 12.02 hrs, Volume= 0.021 af Outflow = 0.01 cfs @ 13.86 hrs, Volume= 0.018 af, Atten=95%, Lag= 110.9 min Discarded = 0.01 cfs @ 13.86 hrs, Volume= 0.018 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-lnd method, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs/3 Peak Elev= 195.38' @ 13.86 hrs Surf.Area= 384 sf Storage=433 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 171.5 min ( 911.1 - 739.5 ) 358DALE-POST-AEC Type III 24-hr Rainfall=6.40" Prepared by ESS Page 4 HydroCADO 8.00 sin 004178 ©2006 HydroCAD Software Solutions LLC 2/20/2012 Volume Invert Avail.Storage Storage Description #1 193.00' 339 cf 12.00'W x 32.00'L x 2.50'H Stone 960 cf Overall - 112 cf Embedded = 848 cf x 40.0% Voids #2 194.00' 112 cf 32.1"W x 12.0"H x 7.50'L Cultec C-100 x 8 Inside#1 451 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 1.020 in/hr Exfiltration over Wetted area #2 Primary 196.50' 4.0"Vert. Orifice/Grate X 2.00 columns X 2 rows with 36.0"cc spacing C= 0.600 Discarded OutFlow Max=0.01 cfs @ 13.86 hrs HW=195.38' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=193.00' (Free Discharge) L2=Orifice/Grate ( Controls 0.00 cfs) Link WEST: Inflow Area = 0.220 ac, Inflow Depth > 2.01" Inflow = 0.52 cfs @ 12.07 hrs, Volume= 0.037 af Primary = 0.52 cfs @ 12.07 hrs, Volume= 0.037 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs Link WETLAND: Inflow Area = 1.247 ac, Inflow Depth > 1.85" Inflow = 2.33 cfs @ 12.12 hrs, Volume= 0.192 af Primary = 2.33 cfs @ 12.12 hrs, Volume= 0.192 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.03 hrs •