HYDRO29361

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Date: 5/7/2002
• Doc Name: Phase IVb/Phase IVc Temporary Diversion Channel Sizing
• From: Cripple Creek & Victor Gold
• To: DMG
• Permit Index Doc Type: Correspondence
• Media Type: D
• Archive: No

Calculation Table 3
Plunge Pool Sizing Calculation
Plunge Pool Design
(Ref. SCS National Engineering Publications Design Note it6)
Input Parameters
Parameter Value Units Comments
Q 61 Cfs Design tlisharge.
D 3.0 ft Canh'lever outlet prye diameter.
SO 0.38 ft/ft Pipe slope.
S 0.36 Sine of the angle whose tangent is the slope of
the pipe.
' y~' U
Zp (-` ~, 0,$ ft
Venicel tlistance from the teiliwater surtace to
;: s~,';r:~s':r,~'y the canWever pipe imrert.
D50:;:3~'; p.75~ R Size of nprap Of which 50Ye of rack (by weight)
f=em.,. i_~a is smaller.
GS 2.65 Riprap particle Density.
Calculations: -
1 . Parameter Value Units Comments
2. O/(sort(gD5)) 0.69
3. Vo 8.6 ft/SBC Velocity in pipe cortesponding to D.
Vh 8.1 ft/seo Hodzantal cempollent of jet impingment
velocity.
Vv 11.5 (USec
VertMal component of jet impingment vebdly.
Tana 1.42 a~jet lmpmgment argle at water surface.
Vp 14.0 fUsec
Velocity where Jet plunges into wafer surtace.
4. Xp 2.1 R Horiz. Distance from pipe exit to center where
jet plurlges iota water surtace.
5. Fd 22 DensimetAc Froude number.
6. Zp/D 0.16667 ratio of pipe invert height (aDOVe taiAwateQ to
pipe diameter.
7. Zm 2.9 ft Maximum wmWted depth of plunge pool.
8. 1+25Dso/D 7.25
9. Riprap adequate ? YES If "NO" , adjust Dsa
10. Xm 4.3 ft Hofa. Distance from pipe exit to center of
plunge pool.
Le $.0 ft Min. horiz. D#t. Ftwn center of pool fo water
surtace cOntaur ~ US or DS end of elliptical-
shape plunge pool.
11. WB 4.7 ft 1/2 min. width (~ center of elliptical-shape
plunge pool ~ water surtace.
Lr2 1.0 ft Adjusted hortz. disc. tram center of pool to water
surtace wntour (Q US or DS entl of rectangular-
shapeplunge pool.
Wr2 0.9 ft 12 min, witlth o(rectangular-shape plunge pool
~ water surtace.
12. A2 3.7 ft'
Pbn rectangular area at bosom of plunge pool
® list. Z below invert elev. of outlet channel.
ZI 17 ft
Side slope ratio of US 8 OS sbpe of rectangular
shape plunge pool. {D = 3.0 (min))
AdjUSf ZI t0 3.0 R Design side slope ratio of US & DS slope of
reUangular-shape plunge pool.
Lr 8.0 $ Adjusted hodz. list. from center of pool to water
surtace contour ~ US or DS end Of redangular-
shapeplunge pool.
Zw 1.6 ft
Sitle sbpe ratio of the side slopes of rectangularv
shape plunge po01. (ZI = 2.0 (min)}
AdjUSf ZW f0 2.0 R Design side slope ratio of the side slopes Of
rectangular-shape plunge pool.
13. Wr 5.6 ft
1l2 adjustetl width ~ center of redangular-
shape plunge pool ~ water surtace.
Lr > Xm ? YES If "NO" , increase side slope, ZI, so Lr > Xm.
Ref. Lr = S.0 ft
Ref. Xm = 4.3 fl
Desi n Summa
Total Top
Len the 16 ft
Tofa( Tap
Width: 11 ft
De the 2 ft
Side side
slo es: 2H:1V
US & DS side
slopes: 3H:1 V
NOTE: Tailwater surtace shoultl
De a minimum of O.Sft below the
pipe invert.
vzg/zcoz Golder Associates 003-2203.200
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