Q4. (4) Figure 4 shows two catchments A and that are being facilitated by a drainage system which consist of two inlets

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Q4 4 Figure 4 Shows Two Catchments A And That Are Being Facilitated By A Drainage System Which Consist Of Two Inlets 1 (26.4 KiB) Viewed 52 times

Q4. (4) Figure 4 shows two catchments A and that are being facilitated by a drainage system which consist of two inlets and two pipes. Catchment A has an area of 1 he and is 50% imperviou catchment has an area of 2 ha and is 100% impers The runoff coefficient, C length of overland flow, Laverage flow velocity, V are given in Table Q4. Calculate the peak flow to be handled the both pipes based on 10-years IDF equation abc²41}}", where a, b, c. and are 4.490, 0997,-0.328 and 0.821, respectively Table Q4a: Characteristics of the catchment Catchment Surface C pervi impervious A B TarmFKAUT Pipe 1 0 30 60 50 120 150 100 210 240 270 300 330 360 390 Catchment A Pipe 2 Inlet 1 E2 Runoff Time (min) UN (m/s) 0 12 28 1.7 14 12 0.91 6.74 061 0.9 0.50 0.28 0.17 0 09 Catchment Figure Q4:Layout of a drainage system of a concent (b) A 30-min unit hydrograph for a 2.25 km watershed is shown in Table Q4b. Verify that this unit hydrograph corresponds to a 1-cm rainfall excess thing this unit hydrograph, estimate the direct runoff resulting from the 90-mis rainfall showTable Table Q4b: 30-min unit bydrograph L(m) 8.30 140 65 10-60 0.029 0.091 0.033 0:090 Table Q&c: Hytograph of a 10-min rainfall Time) Excess rainfall 31 20