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<br />52 - 51 .. 112 _ 01 <br />fat r <br /> <br />-~ <br />r <br /> <br />(12) <br /> <br />S 0 <br />(..1. + 2) <br />fat r <br /> <br />51 <br />. (it + <br /> <br />01 <br />r) + 112 - 01 <br /> <br />(13) <br /> <br />in which: <br />52 . storage at end of interval expressed in flow units for the <br />computation interval <br />51 .. storage at start of interval expressed in salRe units <br />112," average inflow for interval <br />01 '" outflow at start of interval <br />O2 '" outflow at end of interval <br /> <br />Quantities in parenthesis in equation 13 are storage indication at <br />the end and start of the interval. The routing is started byestab- <br />lishing an initial value of storage indication. If outflow equals <br />inflow at the start. an initial storage indication value is obtained <br />f~ the storage indication vs. outflow relation. If storage at the <br />start is known. storage indication is computed by converting units and <br />adding one-half of the corresponding outflow. <br />When storage indication at the start of each interval is known. it <br />can be computed for the end of that interval (the start of the next <br />interval) using equation 13 by simply subtracting the outflow at the <br />start of the interval and adding average inflow for the interval. <br />Outflow at the start of each interval is obtained from the storage <br />indication using the relationship established as discussed in the <br />preceding paragraph. <br />Reservoir routings by this method are performed in the cOMPuter <br />progralllS described in Appendix 2 of this volUlle and Appendix 1 of <br />YolUllle 1. <br /> <br />2-21 <br />