Hydrological studies are a vital prerequisite for the design of drainage systems. Civil engineering problems range from providing adequate drainage for small developing areas in urban centres and for larger areas of agricultural land to the successful containment of major rivers in flood. Consequently, the hydrological events producing superfluous water may be an intensive local storm, the accumulation of excess rainfall over a wet spell of a few days or, on a longer time scale, the seasonal flood from warm rain falling on a melting winter snow pack lying on frozen ground. A whole range of events lies between these extremes.
KeywordsReturn Period Rainfall Intensity General Extreme Value Cloud Droplet Effective Rainfall
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