RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET (Version 5/2005) (Reference Design Note No. 6 (Second Edition), Jan. 23, 1986 JOB: DESIGNER: CHECKER: INPUT DATA: Conduit Diameter Conduit Discharge: Conduit Slope at Outlet: Conduit Outlet Invert Elevation: Tailwater Elevation: Outlet Channel Invert Elevation: Water Density: Bed/Riprap Particle Density: (Default 2.64) D, 50 Riprap Size: Riprap Thickness: (2.5*D, 50 recommended) Bedding Thickness: (6 inch min. rec.) (Enter 0 for geotextile) Side Slope Ratio: Upstream End Slope Ratio: Downstream End Slope Ratio: Combined End Slope Ratio:
Date: Date:
8/14/2008
D= Q= S= El, CO = El, TW = El, CH = RHO = RHOS = RS = RT = BT = Zw = Zlu = Zld = Z1 =
1.00 15.00 0.23 102.50 101.50 100.00 1.00 2.64 1.00 2.50 0.00 2.00 4.00 3.00 3.50
ft cfs ft/ft ft ft ft
ft ft ft ft/ft ft/ft ft/ft ft/ft
OUTPUT---POOL LOCATION AND DIMENSIONS: Vert. Dist. from Tailwater to Conduit Invert: Zp = Submergence Check: (If Zp < 0 , Use Zp = 0) Use Zp = Beaching Check: [Q/(gD^5)^0.5 <= (1.0+25*D,50/D)] **Beaching Controlled** Distance from Conduit Exit to C/L Pool: Xm = Pool depth at C/L Below Conduit Invert: Zp+0.8Zm = Pool Bottom Elev: El,PB = Pool Bottom Length: 2Lr2 = Pool Bottom Width: 2Wr2 = Upstream Pool Length at Tailwater Elev.: Lru = Downstream Pool Length at Tailwater Elev.: Lrd = Pool Width at Tailwater Elev.: 2Wr = Check Side Slope Ratio: (Wr>=We) **Side Slope Ratio Zw O.K.** Check Min. End Slope Ratio: (Lru & Lrd >= Le) **End Slope Ratios O.K.** Check Upstream Length: (Lru >= Xm) **End Slope Ratio Zlu O.K.** Pool Bottom Elev. at Bottom of Riprap: El, BR = Pool Bottom Elev. at Bottom of Bedding: El, BB = OUTPUT---VOLUMES BELOW WATER SURFACE ELEVATION: Volume of Excavation (measured from bottom surface of bedding): V,pbs = Volume of Rock Riprap: V,rs = Area of Geotextile: A,gt = Spreadsheet developed by D. Hurtz, Midwest NTC, 1/90 Spreadsheet modified by M. Dreischmeier, Eau Claire TC, Wis., 3/98 and 5/2005 Design Note No. 6 (Second Edition), Jan. 23, 1986 "Riprap Lined Plunge Pool for Cantilever Outlet" Natural Resources Conservation Service Engineering Division
1.00 ft 1.00 ft O.K. 7.23 3.61 98.89 3.11 2.48 12.01 9.39 12.93 O.K. O.K. O.K. 96.39 ft 96.39 ft ft ft ft ft ft ft ft ft
68.4 cu yd 57.8 cu yd 121.0 sq yd
RIPRAP LINED PLUNGE POOL FOR CANTILEVER OUTLET Reference Design Note No. 6 (Second Edition), Jan. 23, 1986
Elev. 102.5
C Elev. 98.9 3.1
Elev. 101.5
Elev. 100.0
3.6 1 4.0 3.8 7.2 12.0
1 3.0
12.7 SECTION A-A Elev. 101.5 12.9 Elev. 98.9 2.5 1 2.0
24.1
2.5
3.7
SECTION B-B
B
A
OUTLET PIPE
A
ROCK GRADATION % Passing Size (in) 100 24 60-85 18 25-50 12 5-20 6 0-5 2.4
B LANDOWNER DESIGNER: SHEET ___
OF
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