At present, only the total runoff coefficient data for the Meinung Basin si available in Taiwan. Runoff coefficient data based on various land uses are not yet available because of its very small drainage area. In order to obtain more economiccross-section in the design of drainage canals and structures in that basin, more accurate calculation of drainage discharge is indispensable. In this study, rainfall coefficients of the respective small drainage areas in Meinung basin are estimated by using correction/revision method. Runoff coefficient values form outside area were first adopted for calculation and analysis by substituting various land use data of therespective small drainage areas and taking account of the drainage discharge diverted by Chu-Tze-Men Hydropower Plant. Then a correction value, k, can be calculated. After substituting these K- values into the original equation, corrected runoff coefficients for the respective small drainage areas with different land uses and frequencies can be obtained.
