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<br />, <br /> <br />Drain time T is empirically determined from certain physical and geometric <br />properties of the dam and the reservoir, as shown in Table I. <br /> <br />TABLE I <br />DATA REQUIRED TO CALCULATE Qp <br /> <br />Parameter <br /> <br />Description <br /> <br />Dams Data Base3 <br />Component No. <br /> <br />H <br />FB <br /> <br />cw <br /> <br />Height of Embankment, Feet <br />Spillway Freeboard, ~e~t <br />Crest Width, Feet <br /> <br />C32 <br />C403,(0.0) <br />C34 <br />C54 <br /> <br />v <br /> <br />Normal Reservoir Capacity, <br />Acre- Feet <br /> <br />LC <br />A <br />Zl <br /> <br />Crest Length, Feet <br /> <br />C33 <br /> <br />Reservoir Surface Area, Acres <br /> <br />IV <br /> <br />~- <br /> <br />C53 <br />C291. (3.0) <br /> <br />Upstream Slope Inclination, <br />Uni tless <br /> <br />Z2 <br /> <br />~\ <br /> <br />Downstream slope inclination, <br />Unitless <br /> <br />C292, (2.0) <br /> <br />K4 <br /> <br />() ._ _~ ,-, .ee' <br />I ~ .' '" l <br /> <br />Erosion Potential of Embankment, <br />Unitless <br /> <br />C295, (1.0) <br /> <br />The parameters of Table I are usually available with the exception of K4, <br />which represents the relative erodability of embankment materials[11 <br />Suggested values for K4 are presented in Table II. <br /> <br />3 Numbers in parenthesis represent default values. <br />(State Engineer's Office, Computer data base) <br /> <br />5 <br />