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Question 3. The stream flows due to three successive storms of 3.5, 4.5 and 2.5 cm of 6 hours duration each on a basin are given below. The area of the basin is 45.4 km². Assuming a constant base flow of 10 cumec, and an average storm loss of 0.25 cm/hr, a) Derive 6-hour unit hydrograph b) c) Provide the plots of storm event1, 2, 3 and combined storm graphs with the derived the 6-hour unit hydrograph Derive 3-hour and 9-hour unit hydrograph using S-curve method Display 3-hour, 6-hour, 9-hour unit hydrograph together including the S- curve ordinate and lagged S- curve ordinate together Time (hr) 0 3 6 9 12 15 18 21 24 27 30 33 36 39 Stream flow (cumec) 10 14 18 32 46 54 58 49 36 25 17 12 11 10

Fig: 1