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ESTIMATION OF DAM BREACH PARAMETERS <br /> USING THE FROEHLICH 2008 METHOD <br /> PROJECT: Hyatt Lake <br /> BREACH INPUT PARAMETERS: <br /> Select Failure Mode From Drop-Down Menu: PIPING <br /> Height of water over base elevation of breach(H„,)= 19.6 Feet <br /> Volume of water in the reservoir at the time of failure(V„,)= 779.2 Acre-Feet <br /> Reservoir Surface Area at Hw(As)= 75.0 Acres <br /> Height of breach(Hb)= 23.4 Feet <br /> Failure Mode Factor(K0)= 1 <br /> Breach Side-Slope Ratio(Zb)= 0.7 Z(H):1(V) <br /> Dam Size Class: Small Assumes Full Reservoir At Time of Breach. <br /> CALCULATED BREACH CHARACTERISTICS: <br /> Average Breach Width(Ban)= 78.7 Feet <br /> Bottom Width of Breach(Bb)= 62.3 Feet <br /> Breach Formation Time(T,)= 0.77 Hours <br /> Storage Intensity(SI)= 39.7 Acre Feet/Foot <br /> Predicted Peak Flow(Op)= 13853 Cubic Feet per Second <br /> RESULTS CHECK: <br /> Average Breach Width Divided by Height of Breach(B„„g/Hb)= 3.36 If(Bevg/Hb)>0.6,Full Breach Devlopment is Anticipated <br /> Erosion Rate(ER),Calculated as(Ba„9/T,)= 102.2 <br /> Erosion Rate Divided by Height of Water Over Base of Breach(ER/H„,)= 5.2 If 1.6<(ER/H„,)<21,Erosion Rate is Assumed Reasonable <br /> B.,r 1<—<” <br /> MINIMIENEIr T v_ <br /> H <br /> rVZ. Ze <br /> I I <br /> — Bb E-- <br /> Figure l-Breach Variable Definition Sketch <br /> Froehlichv2_0_Hyatt.xlsm <br />