- B The Ordinates Of 10 Minute Unit Hydrograph For A Catchment Is Given Below In Table 3 Estimate The Area Of The Catchm 1 (33.34 KiB) Viewed 19 times
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b) The ordinates of 10-minute unit hydrograph for a catchment is given below in Table 3. Estimate the area of the catchment (express your answer to the nearest hectare where 1 ha = 100m x 100m). Construct a direct runoff hydrograph resulting from the following rainfall excess event (Table 4) and hence determine the peak discharge and time to peak? (1+2+1 Marks) Table 3: 10-minute Unit Hydrograph Time (min) Discharge (m/s) 0 10 50 60 0 0.6 0.1 0 mec Table 4: Rainfall Excess ex ess _table= V₁ vo 3 add R₁+R² u mne pec Time (min) 0-20 20-30 40 20 30 1.2 0.9 0.4 Rainfall Excess (mm) 0.3x (X+Y) 0.8.x (X+Y)