Rainfall Evaluation: Cumulative Cumulative Time (hr) Time (hr) Rainfall (mm) Rainfall (mm) 1 5.95 13 147.075 2 16.525 14 148.525 3 30.3 15 152.625 4 49.4 16 158.525 68.625 17 163.875 90.575 18 170.4 105.1 19 179.45 106.05 20 194.225 9 117.575 21 210.95 10 131.175 22 231.35 11 141.675 23 243.6 12 146.525 24 250 Transform this cumulative rainfall series from a local rain gauge into an incremental rainfall hyetograph. If this fell over a watershed with an area of 1 hectare, what was the volume of rainfall (m3) distributed over the watershed? 67 00

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.