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G:\20225-NVRetail\02.-Rutherford Crossing\Preser)tation\20225 -02 SEDIMENT BASIN COMPS (44).dwg Oct 11, 2007
P rinRc I I geS i I �Ktva �J s i n t L I I
.... ...... __-,
i6jWitk- emer q i,!Ktvay, required spillway capacity Qp", 195.57 cfs
riser and Barr I) T
p
.. ..... ... .. . . ........ . . .......
th 391,13 cfs tit _spjj,� ay, required spillway capa,gity.".9p., Q25 t
.(riser and barrEil)
r9'ency s illwa ........... i__....._.._ _._.......__........__..__.._.. . . . .. .... ....... .. . .....
Assurned available head (h) 3 ft. (Using Q2)
A. . .... . ..... . . .......
Crest of Emeraencv Sr)illwav Elevation - Crest of Riser Elevatioin
=Design High Water Elevation -Crest of Riser Elevation
..... . . ..... .. .. .... .. . .. .... . ..... .. . .. .
... ..........
17 iRiser Diametet (Dr) 72 in. Actual head (h) 23 ft
. ..... . .. .... ...... . .......... . .
From Plate 3.14 -3).
11 ote: Avoid orifice flow conditions.
.... .. ...... . .....
152 ft.
knead Ft) on b t e lthrough em bankm ..
....
F r o m P I a t e3. 1 7). . - - -----
20, Trash rack and anti-vortex device
----------
Diameter = 102 in.
36 in.
MW
11110 , rlqmnm
21. Required spillway capacity Qe = Q25 - Cep
195,571
Bottom width (I _6gft,.- slop of the exit the channel S)
, el j
. .. ........
0,025 ft./foot; and the minimum of the exit channel .... . .. ...
15
.............
(From Table 3,h 4-C). I
Final [lesion E
25.
_,Dqsi9n High
Ernq�rg Inc:
'y
Principal Spill
�Dewaterin 0
leanout Elev
ion of U
Kim
NOTES:
FROM VESCH SIANDARD AND SPECIFICATION 3.14, TEMPORARY SEDIMENT BASIN
1. DIAMETER OF DEWATERING ORIFICE SHOULD NEVER BE LESS THAN 3 INCHES IN ORDER
TO HELP PREVENT CLOGGING BY SOIL OR DEBRIS.
2. FLEXIBLE TUBING USED SHOULD BE AT LEAST 2 INCHES LARGER IN DIAMETER THAN THE
CALCULATED ORII`RICE TO PROMOTE IMPROVED FLOW CHARACTERISTICS.
ACTUAL DIAMETER ',)F DEWATERING ORIFICE= 3 INCHES
ACTUAL DIAMETER DF FLEXIBLE TLJBING= 5 INCHES
ACTUAL DRAWDOWN TIME= 43 HOURS
Tc FIME BASED 04 OF STORM WATER CALCULATIONS FROM SHEETS 5355
SEDIMENT BASIN #1
3.14-2 513
MIN. 1.0' ---688-75
DESIGN HIGH WATER
(100-YR. STORM ELEV.)
V 685.80 0 5'
E_MERC
M IN, 1.0'
_L
__ -------------
67 C.Y./ AC. ...... RISER CREST
683.50
"DRY" STORAGF -------- ....
......
67 C.Y. / AC. ......
DEVICE
"WET"' STORAGE-
INV. = 677.55
0 CMP RISER
SEDIMENT CLEANOUT POINT TI_ SF
ELEV.= 679,76 =68 COLLAR A N
INV.=68 76 �
I V
5" WET STORAGE 678.30
DEWATERING ORIFACE DESIGN ELEVATIONS WITH
W/ 7" PERFORATED
PIPE EMERGENCY SPILL-WAY
FIGURES IN PARENTHESIS DENOTE ACTUAL MENTIONS
CD
OF
�NCY SPILL-WAY
INV.=-686,50
a4 "RCP CL 1111
(1-:=z 152 ) 1
SEDIMENT BASIN
#1
AREA
AND VOUJIME
CALC� JLATIONS
-_
Elevation
___ . . . . . . . . . . . .
Area
Ava, Area
Depth
Volume Volume
SUM. Of Volume
SUM. Of Volume
M
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0
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67830
0
Cz
0
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24596
0.7
17217 638
cn
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679.00
49191
us
R
17217
638
z
71660
1.0
71660 2654
680.00
94128
cc 0 1
88876
C_) M Q..) F_
3292
105201
1.0
105201 3896
681.00
116273
194077
7163 _
127208
1.0
127208
4711
682.00
138143
321285
11899
141015
1.0
141015
5223
683.00
143887
462300
17122
#
........... . .................
,Wet Storacie DoT, �
.... . .... .. � .. . ..... . .......... . .
Determine ThftfLeqi4 red orifice Size for Each Extended Detention LaE11i!y_
......... .. .. ....... ....... .......... . . . . ....... ........ . ... ...
!(A) Available basin volume (S)
E_ 168831 cf
.......... ... . .... ... ...... ..... ....
......
Maximum Head (h) at the required BMP storage h =36
..... .... .
from the elevation-s storage curve for the facility
---------- -- -------
-
......... ..
I (C) r'reak outflow rate ((gyp) at the maximum head
1 or drawdown time of 48 hrs [Op S/(3600 x48)]
0,981
t
Required orifice area Qp/(0.6 x (64.4 x h) ^0.5]
_J
.... ... . . ..
j(E) Diameter of a circular orifice 2.0 x (A/3.1415927)Ao .5
ft.......
0 a in .... ... ...
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