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
100- YR /24HR PEAK DESIGN FLOW - 5.01 CFS
Height of flow (Broad Crested Weir) - H =(Q /CL) ^ 2/3
For C = 2.84, Q= 5.01 cfs, L= 84 in
H = 4.79 in, Spillway Elevation 0 5941.75, Crest 0 5943.0
D50 = 0.126M or 5.Oin
PLAN VIEW
T -40'
RIPRAP DESIGN - FROM PAP -0790 - SIMPUFIED DESIGN GUIDEUNES
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 -lxcos a tan phi -sin a)) ^ 1.11
D50= (0.55(gf ^ 0.52 /S ^ 3 /4)(sin a /(Gc cos a- 1)(cos a tan phi -sin a)) ^ 1.11)/Cu ^ 1/4
FOR SOUTH POND -
D50 = median stone size (m)
Cu = coefficient of uniformity = 1.95, of = unit discharge (m3 /m /s) = 0.066
S = embankment slope (unitless) = 0.333, a - embankment slope (degrees) = 18.43
Gs = specific gravity of riprap - 2.24, phi = angle of repose of the riprap = 42
DIVERSION DIKE
r -20'
SOUTH DETENTION
10 -YR. W.S.EL. -
5941.75 CREST 0
5943.0
2.0' --j �---.,
CREST - in
5943.0
WSEL -
5941.757
3 -inch LAYER 1 -1/2 -inch
050 RIPRAP
Zr)
6.00'
GEC.'i�n Esc
MIRAFI 1120N OR
ALTERNATE RIPRAP FILTER - EQUIVALENT
6 -inch LAYER OF GRAVEL WITH A MAX DIA OF 2 -inch
A D50 OF NO.4, AND A MIN. OF NO. 100.
T -20'
SECTION 11-IRU SPILLWAY
For interstitial flow, Vi (flow velocity) _ (gD50) *2.48s ^ 0.58 *CU -2.22
where s = slope in ft per ft = 0.333
( 32. 16x( 5/ 12)) ^ 0.5x(2.48x(0.333)"0.58)x(1.95 ^ -2.22) = 1.090 fps
Average velocity is the interstitial velocity multiplied by the porosity
(Np) of the riprap - Vav - Vi x Np.
for Np 0.45, Vav = 1.090x0.45 = 0.49 fps.
Depth of flow is the flow quantity divided by the average velocity -
Y = Q/Vav, Y = (5.01/7ft.)/0.49fps = 1.46 ft. or 17.5 in., using
an integer multiple of D50 for thickness gives 4xD50 for 20 inches
of 5 in. D50 riprap.
To provide a safety factor use a riprap with a D50
of 7.5 in.
Vi - (32.16x(7 .5/12)) ^ 0.5x(2.48x(0.333) ^ 0.58)
x(1.95 -2.22) = 1.33
Vav - 1.19x0.45 = 0.60 fps.
Y = (5.01cfs/7ft) /0.60fps = 1.19 ft or 14.3 in, using
an integer multiple of 050 for thickness gives 2xD50
for 15 inches of 7.5 in D50 riprap.
fps
100- YR /24HR PEAK DESIGN FLOW - 5.01 CFS
Channel Data
Maximum Minimum
Slope 0.1155 ft /ft - 0.025 ft /ft
Manning's n 0.0280
Height 24.0 in
Width 62.0 in 0.0 in
Left slope 0.333 ft /ft (V/H) - 0.052 ft/ft
Right slope 0.050 ft /ft (V/H) - 0.333 ft/ft
Computed Results:
Depth 1.91 in
Velocity 4.54 fps
Percent full 7.9 X
DETENTION POND
BASIN AREA
PA -S 1.749
10 -YR /24 HR DESIGN VOLUME -
CN D10 VOLUME
89 1.003 6,369
VOLUME PROVIDED 0 ELEVATION -
ELEV AREA CONIC
4.8 in
2.8 fps
19.9 X
5943.0 8304.86 15,009.2
5942.0 5973.22 7,902.1
5941.75 5520.33 6,517.7
5941.0 3897.19 3,003.7
5940.0 2191.55 0.0
DETENTION POND 100 -YR /24 HR DESIGN VOLUME -
BASIN AREA CN D100 VOLUME
PA -S 1.749 89 1.873 11,890
UfE SPLLWAY T ROU 4
DAM WITH STONE OR SUITABLE
BLOCK TO PROVIDE VERTICAL
CHANNEL WALL
LATERAL SPILLWAY SECTION (typ.,)
1' -4'
RIMROCK EXPLORATION & DEVELOPMENT
PRINCE ALBERT MINE - 1100 PERMIT APPLICATION
EXHIBIT U-2 - STRUCTURES
Surface Water Control and Containment Facilities
DATE: 2/14/12
DRAWN BY: JCP
JR.
SHEET 2 OF 5
JAMES C. PIERCE, JR.
P.O. BOX 100
IEJOLA, COLORADO 81424
61701 884 -7468