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<br />by using simple prismatic geometry as shown in Table 2. Collector and sub-collector <br />channels should be based on the average of what is typical within the subbasin. The <br />main channel shape and dimensions should be approximated as best as possible with <br />one of the prismatic elements shown in Table 2. <br /> <br />5. BASIN MODELING. <br /> <br />The assumptions made using the kinematic wave approach to model a <br />river basin are essentially the same as those made when applying the unit hydrograph <br />technique. Rainfall is assumed to be uniform over any subbasin and there are no <br />backwater effects in channel routing. The assumption that there are no backwater <br />effects has some important ramifications for interpreting the kinematic wave results. <br />Although the channel elements can be used to represent pipe elements, the pipes. <br />never pressurize. The kinematic wave equations are for open channel flow and can <br />n'ot represent the effects of pressure flow. <br /> <br />7-62 <br />