HomeMy WebLinkAboutWPO201700029 Plan - VSMP Minor Amendment 2017-05-24Lx
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%1�DETENTION PLAN AND CROSS—SECTION
C2 1'=5' Shy V
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OpFb,
0
PROP' 6'x6' PRE-TREATMENT CELL BUILD UP GRAVEL 10
THE DETENTION SYSTEM SHOWN ABOVE FUNCTIONS SIMILARLY TO GRADE EX. GRADE VDOT #57 LINED WTH FORM A SMALL CAN PROP 6•X6' TREATED LUMBER UP OF SPILLWAY AT
THE APPROVED BIORETENTION SYSTEM IN REGARDS TO — — — FILTER FABRIC V- GRADE STAPLE FAABBRRIC T ¶M� �yd EXISTING
LEV=49 CRaDE
FACE .� ELEY=499�0
STORMWATER QUANTITY. _ _ _ _ — — _ — r
— — — — — — a6'%6' TREATED LUMBER
E — H STAPLE FABRIC TO INSIDI
_ 1�1 r = i-_= _ -III-_
WATER FROM THE CATCHMENT AREA ENTERS SYSTEM, FILLS IT UP _ _ EX. GR — = FACE OFnMBER
HOPE TO THE LIP OF THE 80' SPILLWAY, AND OVERTOPS IT TO FLOW r1s4i0a®I _ n° STOE III —II li } o ElII—
EAST AS SHEET FLOW. THE PEAK FLOW OFF THE DEVELOPMENT IS I I—III=1 � — TOT C3 I I I— D N O oN I ML 'II
REDUCED FROM THE PRE —DEVELOPMENT PEAK: 0.32 CFS TO 0.13 Na r� — s1oRM ECH Mc-asoo — I sroRM ECH Mc-asao C/VDOT `¢WOVEN GEOTEX711E
FABRIC W 0'G� 111=1 I I �y III I I (� WTH A FLOW RATE
CFS FOR THE 1—YEAR STORM, AND 3.29 CFS TO 3.03 CFS FOR _ OR EWIVAC p OR EOUIYMC-4 1n 0 GAL MIN./SF
THE 10—YEAR STORM. — — = — I —I =11
I f I I THE
I'—I_
THE
STORMWATER QUALITY. THE BIOREMAIN FUNCTIONL CHANGEOTENTONOESIGN SYSTEMSTREOATED-1IIIIIL j1'III�IIIIIIIII� 11=-11=III—III=—JIIII-II1I111=III—III—IIIT—III—IIIfI—II
ENOUGH PHOSPHOROUS TO ACHIEVE WATER QUALITY COMPLIANCE II I IL) I I11 IJ11 ICI II I I- I ICI I II III 11=„111 111-
FOR THE SITE. THE RETENTION SYSTEM WILL NOT TREAT
PHOSPHOROUS, AND STORMWATER QUALITY CREDITS WILL BE
PURCHASED INSTEAD.
MH-1 FLAT TOP
ELEV=502.74 ElEV=502.
O s.o•
3' TALLtf�'— M Ng9.o
WEIR PLATE
10-YR WSF=49A24V 10-YR WSE=496.240
_ 4.0' 15' HOPE —
1-YR WSE=497.17 O 0.50X 1-YA WSE=497.t7 O
_ TO S1M 6
HDPE ELEV=496.0 15' HOPE 0
IN
WEE MESH SCREEN 0.62RfkBM-
PROFILE VIEW SIM 4
REINFORCED STEEL
WEIR PLATE
�15' HDPE O
0.61% FROM
— ELEV=496.0
3.H % 24•W 1-YR ORIFICE
WTH WRE MESH SCREEN
N � W—
I �m
A11E55� WEIR PLAT[ 2 VAULT DETAIL
MANHOLE
o �NEW 15' HDPE
0 _ s�
a.o
PLAN VIEW
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Date
03 17 2017
Scale
1 "= 5'
Sheet No.
C2 DF2
File No.
13.029