4. The following table lists a streamflow hydrograph with a time interval of 10 minutes from a watershed, and the relate

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4 The Following Table Lists A Streamflow Hydrograph With A Time Interval Of 10 Minutes From A Watershed And The Relate 1 (79.33 KiB) Viewed 13 times

4. The following table lists a streamflow hydrograph with a time interval of 10 minutes from a watershed, and the related storm occurred at time steps 3, 4 and 5 with the rainfall depths of 20 mm, 4 mm, and 11 mm, respectively. The 6-index is 30 mm/hr. (1) Use the straight- line method to separate the baseflow. (ii) Use the deconvolution method to derive and plot the 10-minute unit hydrograph. (iii) Calculate the watershed area and determine the time of concentration. (20 marks) Time step (10 minutes) 1 2 3 4 5 6 7 8 9 Discharge (m/s) 1.85 1.73 5.48 9.68 8.87 5.39 4.58 2.63 2.51