120 150 180 Pipe 1 210 240 Pipe 2 270 300 330 360 390 Catchment A Inlet 1 Time (min) UH (m³/s) 0 0 30 12 60 2.8 90 1.7 1

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120 150 180 Pipe 1 210 240 Pipe 2 270 300 330 360 390 Catchment A Inlet 1 Time Min Uh M S 0 0 30 12 60 2 8 90 1 7 1 1 (33.35 KiB) Viewed 44 times

120 150 180 Pipe 1 210 240 Pipe 2 270 300 330 360 390 Catchment A Inlet 1 Time (min) UH (m³/s) 0 0 30 12 60 2.8 90 1.7 1.4 1.2 1.1 0.91 0.74 0.61 0.50 0.28 0.17 0 Runoff Figure Q4: Layout of a drainage system of a catchment. (b) A 30-min unit hydrograph for a 2.25 km² watershed is shown in Table Q4b. Verify that this unit hydrograph corresponds to a 1-cm rainfall excess. Using this unit hydrograph, estimate the direct runoff resulting from the 90-min rainfall shown in Table Q4c. Table Q4b: 30-min unit hydrograph Catchment B Inlet 2 Table Q4c: Hyetograph of a 90-min rainfall Time (min) Excess rainfall (cm) 3.1 2.5 1.7 0-30 30-60 60-90