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PROJECT: <br />4.0 <br />137.0 <br />35.1 <br />40.0 <br />5.0 <br />3.0 <br />3.0 <br />1.0 <br />0.61 <br />Small <br />547.96 <br />481.8 <br />55.0 <br />47.3 <br />42.3 <br />0.18 <br />34.2 <br />1101 <br />9.46 <br />255.9 <br />64.0 <br />Cubic Yards <br />Feet (In Direction of Flow) <br />Reservoir Surface Area at Hw (As) = <br />Breach side-slope ratio (Zb) = <br />Z(H):1(V) <br />Z(H):1(V) <br />Feet <br />Dam Size Class: <br />Crest width of dam (C) = <br />Feet <br />Z(H):1(V) <br />ESTIMATION OF DAM BREACH PARAMETERS <br />Height of water over base elevation of breach (Hw) = <br />Volume of water stored in reservoir at time of failure (Vw) = <br />Walker Reservoir - North <br />EARTHEN (NON-COHESIVE) <br />WITH ALL FAILURE TIMES ESTIMATED BY WASHINGTON STATE METHOD <br />Acre-Feet <br />Feet <br />BREACH INPUT PARAMETERS: <br />Select Embankment Type From Drop-Down Menu: <br />Average Breach Width (Bavg) = <br />USING THE MACDONALD & LANGRIDGE-MONOPOLIS OR WASHINGTON STATE METHODS <br />Acres <br />Hours <br />Breach Formation Factor (BFF) = <br />Embankment Volume Eroded (Ver) = <br />Average Dam Width (Wavg) = <br />CALCULATED BREACH CHARACTERISTICS: <br />Height of breach from dam crest to base elevation of breach (Hb) = <br />Slope of upstream dam face (Zu) = <br />Slope of downstream dam face (Zd) = <br />Feet <br />Piping Orifice Coefficient (Cp) =Used To Calculate Peak Discharge Through Piping Hole <br />RESULTS CHECK: <br />Erosion Rate Divided by Height of Water Over Base of Breach (ER/Hw) = If 1.6 < (ER/Hw) < 21, Erosion Rate is Assumed Reasonable <br />Assumes Full Reservoir At Time of Breach <br />Bottom Width of Breach (Bb) =Feet <br />Breach Formation Time (Tf) = <br />Peak Breach Discharge (Qp) =Cubic Feet per Second <br />Erosion Rate (ER), Calculated as (Bavg/Tf) = <br />Average Breach Width Divided by Height of Breach (Bavg/Hb ) = If (Bavg/Hb) > 0.6, Full Breach Development is Anticipated <br />Acre Feet/FootStorage Intensity (SI) = <br />DWR_3567011-North.xlsm