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<br />Where: <br /> <br />4.6. BASIS OF METHOD. Further considerations of the method disclose <br />its properties. In figure 2 let hydrograph A be defines by discharges 10' 11, I 2' . . .1 <br />n at times to' t l' t 2' . . . t n with time intervals At so short the discharge varies linearly <br />in the interval. Hydrograph B is the same hydrograph translated without change in <br />shape to a downstream point to which the travel time is At/2. The discharges at time <br />t" t 2....t n+ , are (I 0+1,)/2. (11+12)/2....(1 n_,+1)12. <br /> <br />FIGURE 2 <br /> <br />7-47 <br />