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<br />. <br /> <br />Qp Calculation <br /> <br /> <br />The first step in the hazard classification procedure is determination of the <br /> <br /> <br />outflow hydrograph due to failure of the darn. The hydrograph is assumed to <br /> <br /> <br />exist at a section immediately downstream of the dam where routing begin!lJ: <br /> <br />The outflow failure hydrograph.is assumed to have the characteristics as shown <br />in Figure 1. <br /> <br />a, cfs <br /> <br />op <br /> <br /> <br />V <br />Reseroir <br />Volume <br /> <br />0, <br /> <br />1i ,Iblrs <br /> <br />- <br /> <br />Base Time T <br /> <br />I[ <br /> <br />FIGURE 1 <br /> <br />Idealized Failure Hydrograph <br />The assumed shape is that of an isosceles triangle having a peak value equal <br />to Qp (ds), and base time T (Hours). T represents the time required to fully <br />drain the contents of the reservoir. The following relationship is developed <br />fran the geometry of the triangle; V is the reservoir volune in acre-feet (the <br />area inside the triangle) I and the constant, 2~:J, is a conversion factor to <br /> <br />------ <br /> <br />obtain units of cubic feet per second. <br /> <br />v <br />QP = ~.x (24.2) <br /> <br />Equation 1 <br /> <br />*Refers to ,references at end of text <br /> <br />4 <br />