Laserfiche WebLink
Table 2 <br />U.S. Corps of Engineers (mild) Method Riprap Size Calculation <br />Riprap Channel Evaluation <br />DRMS Civil Engineering <br />PROJECT NO.: M- 2011 -028 <br />Date: <br />7/31/12 <br />By: <br />TC1 <br />Chkd: <br />A rvd: <br />Riprap Calculations for Mild Riprap Bed Slopes <21/6 <br />Depth Velocity Channel Calculated <br />Design Normal Averaged i Distribution Side Slopes Particle I Riprap <br />Flow Flow Depth'; Velocity ! Coefficient Correction Size Size <br />Reach Designation 0 (cfs) d (ft) V (f /s) Cv K1 D30 (ft) D50 (in) <br />Page 1 (n -0.02) 167.1 1.58 5.80 1.19 0.93 0.28 4.4 <br />- -- - - - - -- - -- - -- <br />Page 1 (n=0.035) 167.1 2.11 3.88 1.19 0.93 0.10 1.5 <br />Page 1 (n- 0.040) 1671 2.25 353 1 19 0.93 0.07 1.2 <br />Page 2 (n=0.02) 167.1 1.31 7.40 1.19 0.93 0.55 8.5 <br />Page 2 (n=0.035) 167.1 1.76 4.98 1.19 0.93 0.19 2.9 <br />Page 2 (n- 0.040) 167.1 89 i 4.53 1.19 0.93 0.15 2.3 <br />Page 3 (n =0.02) - 11.7 0.39 i 2.58 _ 1.22 -0.-9d 0.05 _ 0.8 <br />Page 3 (n=6.035 ). 11.7 0.54 i 1.78 1.22 0.02 0_3 <br />Page 3 (n=6.0-40) 11.7 0.58 1.63 _ 1.22 0.93 0.02 0.2 <br />Page 4 (n- 0.02) - 11.7 0.32 3.23 - 1.22 0.93_ 4 0.10 -1.6 <br />- -- --- - - - - -- - - - -- . .......... <br />Page 4 (n =0.035 11.7 0.44 2.24 1.22 0.93 0.04 0.6 <br />Page 4 (n=0.040) 11.7 0.48 1 2.05 1.22 0.93 0.03 0.5 <br />_... .... ... .. _ -..1.. .. _ ..._ _.. 1._ _ _. _... ._ _ .. ._.... _ _.....__. _..._..__ .._ ._.... _ .. .......... ........ <br />USACE Paper EM 1110 -2 -1601, 6/30/94 <br />25 <br />D - S CC C d Yw V <br />3- f s V T <br />Y. -Y „. ({igd <br />Inputs below as determined in EM 1110 -2 -1601, 6/30/94 <br />1.1 Sf: Minimum safety factor of 1.1 for moderate debris impact <br />0.375 Cs: Value of 0.30 for angular rock <br />155 ys: Density of solids (pcf) <br />2.2 Cg: Gradation Coefficient (D85/D15) <br />2.0 T: Riprap Thickness (x D50) <br />0.910 CT: Correction for thickness > 1.5 ' D50 <br />Note: A Cv of 1.25 should be used downstream of concrete channels due to the <br />difference in velocity profiles <br />Riprap D50 determined as recommended in EM 1110 -2 -1601, 6/30/94 <br />( Da5) <br />D5o = D30 <br />D15 <br />Page 1 of 2 <br />M:\ Min \TC1 \M - 2011 -028 Animas Glacier \M- 11- 28- BasinRiprapv4.13.xlsm DRMS 8/1/2012 <br />