2012-02-17_PERMIT FILE - M2011040

• Permit No: M2011040
• IBM Index Class Name: PERMIT FILE
• Doc Date: 2/17/2012
• Doc Name: RESPONSE TO TIM CAZIER MEMO
• From: RIMROXK EXPLORATION & DEVELOPMENT
• To: DRMS
• Email Name: GRM
• Email Name: TC1
• Media Type: D
• Archive: No

SPILLWAY RIPRAP DESIGN T • 40'
100- YR /24HR PEAK DESIGN FLOW - 6.58 CFS
Height of flow (Broad Crested Weir) - H =(Q /CL)"2 /3
For C = 2.84, Q = 6.58 cfs, L = 84 in
H = 5.75 in, Spillway Elevation 0 5941.75, Crest 0 5943.0
RIPRAP DESIGN - FROM PAP -0790 - SIMPUFIED DESIGN GUIDELINES
FOR RIPRAP SUBJECTED TO OVERTOPPING FLOW (BuRec, CSU)
D50 Cu"1 /4= 0.55(gf"0.52 /S "3 /4)(sin a /(Gs cos a -1)
(cos a tan phi -sin a)) "1.11
D50= (0.55(gr0.52/S"3/4)(sin a /(Gc cos a -1)
(cos a tan phi -sin a)) "1.11)/Cu"1/4
FOR NORTH POND -
D50 = median stone size (m)
Cu = coefficient of uniformity = 1.95,
of = unit discharge (m3 /m /s) = 0.087
S = embankment slope (unitless) = 0.333,
a = embankment slope (degrees) = 18.43
Gs = speciflc gravity of riprap = 2.24,
phi = angle of repose of the riprap = 42
050 = 0.145M use 6.Oin
For interstitial flow, Vi (flow velocity) _ (gD50) "0.5 *2.48x"0.58 *CU" -2.22
where s = slope in ft per ft = 0.333
1/1 = ( 32. 16x( 6/ 12) ) "0.5x(2.48x(0.333)"0.58)x(1.95 ' -2.22) = 1.194 fps
Average velocity is the interstitial velocity multiplied by the porosity
(Np) of the riprap - Vav - Vi x Np.
for Np = 0.45, Vav = 1.194x0.45 = 0.537 fps.
Depth of flow is the flow quantity divided by the average velocity -
Y = Q/Vav, Y = (6.58/7ft.)/0.537fps = 1.75 ft. or 21.0 in., using
an integer multiple of 050 for thickness gives 4xD50 for 24 inches
of 6 in. D50 riprap.
.-
ONIT
\
BASIN AREA
PA -N1 0.41
PA -N2 0.56
BASIN AREA
PA -N1 0.41
PA -N2 0.56
\ \ ^`
J
/
f
To provide a safety factor use a riprap with a D50 of 9.0 in.
VI = ( 32.16x(9/12)) "0.5x(2.48x(0.333) "0.58)x(1.95" -2.22) = 1.46 fps
Vav = 1.46x0.45 = 0.66 fps.
Y = (6.58cfs/7ft) /0.66fps = 1.43 ft or 17.15 in, using an integer
multiple of D50 for thickness gives 2xD50 for 18 inches of 9 in D50 riprap.
DETENTION POND 10 YR /24-HR DESIGN VOLUME -
CN D10 VOLUME
88 0.941 1,402
89 1.003 2,039 TOTAL - 3,441
VOLUME PROVIDED 0 ELEVATION 5908.75 - 3926.5
DETENTION POND 100 YR /24-HR DESIGN VOLUME -
CN 010 VOLUME
88 1.792 2,666
89 1.873 3,807 TOTAL - 6,473
ST DIVERSION SWALE SUB -BASIN PA N11 - FLOW
3 CFS
Channel Data:
Flowrate 1.13 cfs
Manning's n 0.0280
Slope 0.0663 ft/ft
Height 24.0 in
Left slope 0.33 ft /ft (V/H)
Right slope 0.33 ft/ft (V/H)
Depth 3.76 in
Velocity 3.83 fps
Percent full 15.67 X
DUMP
SLOPE VARIES EXISTING
-
r GROUND
SECTION H-H -77 .. I.
T -20'
3 -INCH
LAYER OF
1 -1/2 -Inch
050 RIPRAP
T -8'
DUMP
T -20'
ALTERNATE RIPRAP FILTER -
in 6 -inch LAYER OF GRAVEL WITH A
c. MAX DIA OF 2 -inch, A 050 OF
N0.4, AND A MIN. OF NO. 100.
.
2.2
GEOTEXT1LE - MIRAFI 1120N
OR EQUIVALENT
DETAIL THRU SPILLWAY
DATE:
DRAWN
--6.0'
3
EXISTING -J
5905.00
10 YR WSEL -
5908.75
ELEVATION
5909.0
5908.75
5908.0
5907.0
2/11/11
BY: JCP. JR
SHEET 4 OF 5
AREA
4221.22
3697.25
2371.78
1053.97
CREST -
5910.00 .,
SECTION I-1
T - 20' NORTH DETENTION
DETENTION POND 10 YR /24-HR DESIGN VOLUME -
VOLUME (CONIC)
4915.6
3926.5
1668.9
0.0
RIMROCK EXPLORATION & DEVELOPMENT
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Surface Water Control and Containment Facilities
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