《Table 2 HTP and KP valued in the study area》

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《"Evaluation of a traditional method for peak flow discharge estimation for floods in the Wenchuan Earthquake area,Sichuan Province,China"》

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Notes:P=rainfall probability；HTP=design rainfall amount in different duration periods（1/6，1，6，or 24 h），a statistic product from the long-term historical precipitation data（mm）；Kp=modulus coefficient，which is a lookup value from the relation betwee

（2） Flow discharge monitoring stations.Three flow discharge stations were established in the W-I and W-II tributaries（stations S1 and S2），and in the main stream（station S3）.The geomorphic parameters for the three basins are listed in Table 1.Flow depth（h）and surface velocity（v）were monitored using ultrasonic stage meters and electromagnetic Doppler speedometers.Video cameras were also deployed to calibrate the instruments.The discharge volume was calculated as the product of the cross-sectional water velocity（v/）and cross-sectional area of the flow（A）:Q=v/A.Here we use the relationship of v/=0.6v，which was derived by Takahashi from the Bagnold’s dilatant fluid theory，and tested by experiments and field data（Takahashi 1991；Hungr et al.1984）.