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<br />because outflow changes during the computation interval and must be <br />estimated at the start of the interval. The general routing procedure <br />is as follows: <br />~. Compute the average reservoi r i nfl ow, i ncl udi ng rai nfa lIon <br />the lake, for each computation interval of the floOd. <br />b. If outflow is strictly a function of storage during any portion <br />of the flood, prepare a storage-indication curve by plotting outflow <br />against storage indication. Storage-indication is equal to half of <br />the outflow plus all of the storage, where storage is expressed in <br />volume units that represent one unit of outflow continuing for one <br />computation interval of time. This is illustrated in table 3.01 and <br />fig. 3.01. <br />c. Where outflow is strictly a function of storage, start with <br />the storage indication value corresponding to the specified initial <br />storage, subtract the corresponding outflow and add the average inflow <br />for the computation interval to obtain storage indication for the end <br />of the computation interval. A value of outflow for the end of the <br />interval is then read from the storage-indication curve. This step is <br />repeated for each interval, starting with the new storage-indication <br />value, as illustrated in table 3.02. Fig. 3.02 illustrates the routing <br />graph i ca 11y. <br />d. Where outflow depends on conditions downstrea~, determine the <br />average outflow for each current interval in accordance with the regula- <br />tions, subtract from initial storage for the interval and add average <br />inflow for the interval to obtain storage at the end of the interval. <br />Storage must be expressed in volume units corresponding to one unit of <br /> <br />3-02 <br />