HomeMy WebLinkAboutWPO200700104 Plan - As-built Stormwater Management Plan 2021-09-094,
WW & ASSOCIATES DESIGN STAGE STORAGE DATA
Planned Pond Storage Volume WW & Associates
No
Elevation (ft)
Area (sq. ft)
Ave Area (sq. ft)
Volume-(cu. Ft)
Cumulative (cu. Ft)
1
471.99
0.00
0.00
0.00
0.00
2
472.00
7179.00
3589.50
35.89
35.89
3
474.00
8643.00
7911.00
15822.00
15857.90
4
476.00
10208.00
9425.50
18851.00
34708.90
5
478.00
11873.00
11040.50
22081.00
56789.90
6
480.00
15735.00
13804.00
27608.00
84397.90
7
482.00
1 18423.00
17079.00
34158.00
1 118555.90
WW & ASSOCIATES DESIGN CROSS SECTION WITH AS -BUILT CHANGES
NOTE: ALL RCP PIPE CONNECTIONS FOR RISER
5TR41.
GASK
490
485
480
475
470
465
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'GALVANIZED PLATE
GT R15ER SECTION3
RI,ER JOINT)
SECTION' bEBRIS HQOD
=�- 477.20'
tIFICE PIPE 2.5" ORIFICE TO BE
C atrr #i- o 472.20'
IF THIS DR'AWINO IS A REDUCTION
QRAPHIC 'SCALE MUST BE DSEC)
INSTALLED WITH TRASH RACK
Tabl'e 1 : Wtite'r`Qu8ili't Cam llanc'etable _
WATER QUALITY COMPLIANCE
proijec't`a'r+e:a 6i.1' � hou be rvu hly ecl ra! to: timi a of dis#urbance)
area capturred 48 6-
_
Q - -
percertt+capture 80% (shvuId be 9611% or batten
f, factor �.(� (1.Q, Qr 0:1� (ar" sites in the development areas where existing impervious cover is greaterthan 200!q
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idcifity narria
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facility type
rep rks:
SWN1 No. 1
20.5 O,210
0;33
34%16:
331 a6.Q
EX. Detention faslrr
��w��.
_ 30259,0
1.9Q
Per .madent
P'bol tar
Aesthetic
SWM No,, 2
89.4 Q 20
0.0,9
COX"
-
Reim#ion Basin
NIA..
fop,
WA,
oublity
8WM No. 3
1 P.7 4,:90
0;37
?4 °l
5io?' ,'
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50%
W247.0
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12 DIA. 147711
299\ 1 Z_ Orifice E ev 4 '
2.50" Orifice Modified
12"x 12" x 12° 1.5'
EW-1
Trash Rack See
Detail This Sheet
Bottom Elev =
0.5' Inv='
6" OF #3 2.5'
Gravel
Embed 6"
in Concrete
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Embankment
CM P Anti -Vortex
Device
48"RCP
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T 1N AR > N D IM+L F R. P I F' C` ICI �I c F� T rtvar� : ArI>)` €4Rini .TA,tivAi:
36" HDPE INV. IN = 48(
/
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2.5" EXTENDED DETETION
30 HOUR DRAWDOWN
Inv 472.10'
N::
1.5' 0.5'
MODIFIED ENV-1
NOT TO SCALE
Top of Dam
E ev = 482.50'
12' �-
101.0' 24" RCP
@ 1.2%
�.
0
AS -BUILT CONCRETE RISER STRUCTURE DETAIL
T\T T C
TH OF
Dustin E. Greene
Lic. No.
A�Po 55833
�SSIONAL to-"
494- ---- \ 96,E \
�- -492 - ~ - 494`
�\ \
` - _----- _ \
/_------488-- `492
/ /�------486---490 \ \ \ \
8
-474 - \ \ \ \ \ \ \ �8� 1 \ 36" HDPE INV. OUT = 479.8'
�cb� o \ \ \ \ \ \ - I� W/ FLARED METAL END SECTION I
v v v�
C o \ I
WSE = 476.8' I I I I
1
00
�
\
+82.5 � 480 �\ \ \ \ \ \ \ Q5
C,I '
�Onded Steel Grate OoeninQ Dat°il
Not To Scale
1.03. .203,
3.0 7.44" .040" .264'
/16" HOLES
AS SHOWN
-1 1/2- X 1 1/2- X 1/4-
STEEL ANGLE (TYPO
9 1/2" X I/4- STEEL
STOCK WELDED TO
BASE AS SHOWN
GENERAL NOTES FOR TRASH RACK
STEEL TO CONFORM TO ASTM A-36.
ALL SURFACES OF TRASH RACK(S) MUST BE HOT DIPPED GALVANIZED AFTER FABRICATION.
TRASH RACK(S) TO BE FASTENED TO WALL WITH 1/2- MASONRY ANCHORS. TRASH
RACK(S) TO BE REMOVABLE.
TRASH RACK(S) TO BE CENTERED HORIZONTALLY OVER THE OPENING.
FABRICATOR MAY MODIFY COMPONENTS OF TRASH RACK FRAME TO IMPROVE
CONSTRUCTABILITY OF TRASH RACK. MODIFICATIONS MUST BE APPROVED BY
MCDPS PRIOR TO FABRICATION.
* DETAIL TAKEN FROM MONTGOMERY COUNTY,
MARYLAND WATER RESOURCES SPECIFICATIONS.
CONTRACTOR TO USE THIS TRASH RACK
Inv = OR AN EQUIVALENT APPROVED BY THE VSMP
AUTHORITY.
1470.8ORIFICE TRASH RACK
NOT TO SCALE
Dewatering Orifice Spreadsheet
A= Flow area of orifice, ftZ
d = diameter of circular orifice in, ft
h = average driving head (height from Principal Spillway to orifice divided by 2), ft
Q = volumetric flowrate needed for intended drawdown, ft3/s
S = Storage or WQV required, ft3
h = 5.33 ft
Q = 0.40 ft3/s 43072 ft3 WQV provided
S = 43072 ft3 108,000 s 30 hours
A= Q
(64.32 * h)"' * (0.6)
A = 0.036 ft2
d = 2* (A/3.14)AO.5 APPROVED
d = 0.21 ft by the Albemarle County
d = 2.57 inches
Community OevelOpment Department
Date 1/1"(
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REVISIONS
DATE
JUNE 30, 2021
SCALE
111-20'
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FILE NUMBER
10.0156
SHEET
1 OF 1
L\Pr jects\Civil Projects\2010\10.0156\SURVEY\DWG\AS-BUILT\10.0156-HYLAND SWM PHI AS-BUILT.dwg, 6/30/2021 8:54:27 AM, AutoCAD PDF (General Documentation).pc3