Question 2. The following Table 1 are the ordinate of general hydrograph of flow from a catchment of 780km² due to 6 hour rainfall. Assume that the constant base flow of 20 m³/sec can be considered. b) c) d) Derive 6-hour unit hydrograph and plot the 6-hour unit hydrograph Derive 12-hour unit hydrograph and plot the 12-hour unit hydrograph using superposition method. Provide all plots for both superposition method Derive 12-hour unit hydrograph using S-curve method. Provide all plots for S-curve method including the S-curve ordinate and lagged S- curve ordinate Display 6-hour and 12-hour unit hydrograph together with including the S-curve ordinate and lagged S-curve ordinate together Time from the beginning of rainfall (hr) 0 6 12 18 24 30 36 40 44 48 52 56 60 64 Discharge (cumecs) 0 40 64 215 360 405 350 270 205 145 100 70 50 42 Mark allocated:20

Solved: Question 2. The following Table 1 are the ordinate of general hydrogra

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Question 2. The following Table 1 are the ordinate of general hydrograph of flow from a catchment of 780km² due to 6 hour rainfall. Assume that the constant base flow of 20 m³/sec can be considered. b) c) d) Derive 6-hour unit hydrograph and plot the 6-hour unit hydrograph Derive 12-hour unit hydrograph and plot the 12