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ESTIMATION OF DAM BREACH PARAMETERS <br /> USING THE FROEHLICH 2008 METHOD <br /> PROJECT: Fuchs Reservoir <br /> BREACH INPUT PARAMETERS: <br /> Select Failure Mode From Drop-Down Menu: PIPING <br /> Height of water over base elevation of breach(H„,)= 17.8 Feet <br /> Volume of water in the reservoir at the time of failure(V„,)= 240.9 Acre-Feet <br /> Reservoir Surface Area at Hw(A,)= 26.0 Acres <br /> Height of breach(Hb)= 22.6 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(B,09)= 54.0 Feet <br /> Bottom Width of Breach(Bb)= 38.2 Feet <br /> Breach Formation Time(T,)= 0.44 Hours <br /> Storage Intensity(SI)= 13.5 Acre Feet/Foot <br /> Predicted Peak Flow(OP)= 7927 Cubic Feet per Second <br /> RESULTS CHECK: <br /> Average Breach Width Divided by Height of Breach(B„„9/Hb)= 2.39 If(B,„g/Hb)>0.6,Full Breach Devlopment is Anticipated <br /> Erosion Rate(ER),Calculated as(B,„9/T,)= 121.7 <br /> Erosion Rate Divided by Height of Water Over Base of Breach(ER/H„,)= 6.8 If 1.6<(ER/H„,)<21,Erosion Rate is Assumed Reasonable <br /> : T <br /> H Z, Ze <br /> H_ R I r I< VV...-� 1 <br /> Bb 4— W <br /> Figure 1-Breach Variable Definition Sketch <br /> Froehlichv2 0 Fuchs.xlsm <br />