The purpose of this research lies in studying how to select the hydrology records of the rainfall in watershed with the method of an exhausting algorithm, making an attempt to achieve the goal of figuring out the maximum design rainfall pattern in the watershed. First, this research defines the decision parameters of the hourly rainfall selection and analyses with AHP to sieve out the weight of each decision parameter. Then, the hourly rainfall records which fit the weight sequence of the decision parameters are chosen. Finally, the exhausting algorithm method coupled with level sequence average method is used in order to calculate the maximum design rainfall pattern. This research is applied to the case ”Jing-May River District” with an aim to discuss the influence of the selection of the hourly rainfall cases on the design rainfall pattern.
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