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<br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />falling over an area during a given period of time. For a <br /> <br />particular storm, a certain percentage of the total rainfall <br /> <br />will be retained within the drainage area, with the remainder <br /> <br />being transported out of the area by the drainage system. <br /> <br />This system must be capable of carrying a peak rate of run- <br /> <br />off generated within the drainage area. The total amount of <br /> <br />runoff from a given area is of little importance when planning <br /> <br />storm drainage systems. It is the peak rate of runoff which <br /> <br />the system must be capable of transporting which is of major <br /> <br />importance. <br /> <br />2. PREDICTING PEAK STORM WA TER RUNOFF <br /> <br />Numerous methods and procedures have been developed for <br /> <br />predicting peak rates of runoff. Generally speaking, most <br /> <br />methods fall into either of two categories -.sta.tistica1 metho<!~ <br />~- - <br /> <br />or calculations based upon m,athematica1 models. <br />c-; .... 1. \- r;,..~.oY <br /> <br />3. STATISTICAL METHODS REVIEWED <br /> <br />Statistical methods are generally based upon recorded events <br /> <br />which have taken place over the area under consideration or <br /> <br />Over an area having characteristics similar to those of the <br /> <br />area under study. This is one of the more reliable methods <br /> <br />of estimating peak runoffs, providing accurate and numerous <br /> <br />9 <br />