Preliminary analysis of recession flow characteristics of granitic catchments

Even though granite formation in Peninsular Malaysia has been generally known as poor aquifers, their ability to sustain river flow during periods of less or no rainfall has not been generally evaluated. Obviously, quantitative assessment about groundwater storages and their releasing rates especially during dry weather period form the basis for development and optimal utilization of our water resources. The magnitude and variability of recession flows from a catchment depend upon many factors. However it has been commonly assumed that recession flows are less dependent upon precipitation and intensity distribution than physical storage of a catchment. Since, characteristically, these flows are more or less steady, it has been a common practice to represent them by general mathematical models. In this study an attempt has been made to evaluate the recession flow characteristics of two granitic catchments viz Sungai Lui (68.1 km2) and Sungai Semenyih at Kg. Rinching in Selangor, (225 km2). Both catchments have similar characteristics for soil cover which is derived from weathered granite or granite parent material Basically, slopes of individual recession hydrographs were determined and based on selected 39 and 49 recession hydrographs for Sg. Semenyih, and Sungai Lui respectively, it was found that the average recession coefficient for the Sg Lui and Sungai Rinching is 0.0463 and 0.0315 day·1 respectively. The exponential function model used to the described the recession flow of the two rivers was Q( = Qoe-

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