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 #6)
Q 61 Gf5 Design tlisharge.
D 3.0 ft Cantilever outlet pipe diameter.
So 0.38 ft/ft Pipe slope.
S 0.36 Sine of the angle whose tangent is the slope of
the pipe.
Zp,°„.m~. ~$' R VeNwl tlistance fmm the tailiwater surtace to
#='~{`~~
D50 -:~„~„xQ'i~5±R the ranliiever pipe Invert.
Size of ripmp of which 50%of rock (by weight)
:~h,:„.,,;j~. is smaller.
GS 2.65 Riprap panicle density.
Calculations:
1. Parameter Value Units Comments
2. O/(sgrt(gDs)) 0.69
3. VO 8.6 fUseC Velociy in pipe mrrespanding to O.
Vh 8.1 ft/seC Honzonlal component ofjetimpingment
vebary.
Vv 11.5 ft/sec
Vergral wmponent of jet impingment veloGly.
Tana 1.42 a=jet impingment angle at ureter surtace.
Vp 14.0 ft/sec
VelorJy where jet plunges into water surtace.
4 . Xp 2.1 ft Honz. Distance from pipe exit to center where
jet plunges into water surtace.
5. Fd 2.2 Densimetnc Froude number.
6. Zp/D 0.16667 ratio of pipe invert height (above [ailwater) to
pipe diameter.
7. Zm 2.9 R Maximum wmputetl depth of plunge pool.
8. 1+25D5g/D 7.25
9. Riprap adequate ? YES If "NO" , adjust Dso
10. Xm 4.3 ft Hor@. Distance from pipe exit to center of
plunge pool..
Le 5.0 ft Min. honz. Dist. From center of pool to water
surtace contour ~ US or DS end of elliptical-
shape plunge pool.
11. We 4.7 ft i/2 min. width (~ center of elliptical-shape
plunge pool ~ water surtace.
Lr2 1.0 ft Adjusted honz. tlist. from center of pod to water
surtace contour ~ US or OS end of rectangular-
shape plunge pool.
Wr2 0.9 R 1/2 min. witlth of rectangular-shape plunge pool
~ water surtace.
12. A2 3.7 R'
Plan rectangular area at bottom a! plunge pool
(~ tlist. Z below invert elev. of oWet channel.
ZI 1.7 R
Side slope ratio of US & DS slope of reMangular
shape plunge pool. (LI = 3.0 (min)F
AdjUSI ZI t0 3.0~ R Design side slope ratio of US 8 DS slope of
rectangular-shape plunge pool.
Lr 8.0 ft Atljusletl horiz. dill. from center of pool to water
surtace wntour ~ US or DS end of rectangular-
shape plunge pool.
Zw 1.6ft
Side slope ratio of the slde slopes of reMangulan
shape plunge pool. {ZI = 2.0 (min))
AdJUSt ZW t0 2.0 ft Design side slope ratio of the sitle slopes of
rectangular-shape plunge pool.
13. Wr 5.6 ft
' 1!2 adjusted width @ center of reCangular-
shapeplunge pool (~ water surface.
Lr> Xm ? YES ff "NO" , increase side slope, ZI, so Lr> Xm.
Ret. lr= BOfl
Ref. Xm = 4.3 fl
Desi n Summa
Total Top
Len the 16 ft
Total Top
Width: 11 ft
De the 2 R
Side side
slopes: 2H:1 V
US & DS side
slopes: 3H:1 V
NOTE: Tailvrater surtace shcultl
be a minimum o! O.Stt below the
pipe Inven.
vzs/2oo2 Golder Associates 003-2203.200
Jh00JOBS1003-2203\a URFWATEIPLUNGE.XLS CCV