Laserfiche WebLink
Input Parameters for Highland #3 <br /> h W =depth of water above breach invert at time of failure = 2.0 m 6.6 ft <br /> h b = height of breach = 2.2 m 7.1 ft <br /> h d = height of dam = 2.2 m 7.1 ft <br /> V„, =volume of water stored above breach invert at time of failure = 1,183,372 m' 959.3 ac-ft <br /> S = reservoir storage = 1,183,372 m3 959.3 ac-ft <br /> Ko = 1.4 for overtopping, 1.0 for piping = 1 <br /> Z= breach side slope = 0.7 <br /> Breach Width Equations <br /> Froehlich (2008) <br /> B =0.27K,VWo.32hboo4 = 24.4 m 80.2 ft <br /> bottom width = 22.9 m 75.2 ft <br /> Von Thun and Gillette (1990) <br /> Cb =function of reservoir size= 6.1 m 20.0 ft <br /> B =2.5h + C b = 11.1 m 36.4 ft <br /> bottom width = 9.6 m 31.4 ft <br /> USBR(1988) <br /> B=3(hw) = 6.0 m 19.7 ft <br /> bottom width = 4.5 m 14.7 ft <br /> Failure Time Equations <br /> Froehlich (2008) <br /> tf = 63.2(Vw/(g*hb2))O.5 = 2.82 hours <br /> Von Thun and Gillette (1990) <br /> ft =B/(4h w) (erosion resistant) = 1.39 hours <br /> USBR(1988) <br /> tf =0.011(B) = 0.07 hours <br /> B =average breach width <br /> V er =volume of embankment material eroded <br /> t f =failure time <br /> Cb =6.1 m for V,N< 1230000 m3 <br /> Cb = 18.3 m for 1230000 m3< V,N<6170000 m3 <br /> Cb =42.7 m for 6170000 m3< VW< 12300000 m3 <br /> Cb =54.9 m for Vw> 12300000 m3 <br />