6. Below are two triangular unit hydrographs for 2 neighbouring catchments. UH B 20 m³/s UH A 25 m³/s 2 hr 3 hr 8 hr (a)

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6 Below Are Two Triangular Unit Hydrographs For 2 Neighbouring Catchments Uh B 20 M S Uh A 25 M S 2 Hr 3 Hr 8 Hr A 1 (52.93 KiB) Viewed 26 times

6. Below are two triangular unit hydrographs for 2 neighbouring catchments. UH B 20 m³/s UH A 25 m³/s 2 hr 3 hr 8 hr (a) What is the area of catchment B? k (b) What can you say about the runoff response of each catchment? (c) Net rainfall of 10 mm in the first hour, 20 mm in the second hour and 15 mm in the third hour falls on catchment A. Calculate the resulting run-off as a function of time. (d) Net rainfall of 5 mm in the first hour, 10 mm in the second hour and 8 mm in the third hour falls on catchment B. Calculate the resulting runoff as a function of time. (e) The rivers flowing out from catchments A and B meet shortly after they leave the catchments. A storm with the net rainfall given above moves across the two catchments, with the rainfall starting an hour later on catchment B than catchment A. Calculate the resulting combined run-off as a function of time. (f) The simple triangular 1-hr unit Hydrograph 'UH A' from above was actually generated using the data below. Use the data to generate a 2hr hydrograph. Plot your hydrograph and fit a simple triangular UH to it. What's the peak flow of your 2-hr UH? And the time to peak flow? Check that that volume implied by your UH is appropriate. 2 3 4 Time (hr) Flow (m3/s) 5 6 0 0 1 10.5 19.75 16.25 11 5 6 hr 0