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Raji
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Asked: 2024-06-03T20:48:02+05:30 In:

The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is

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The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is

1 Answer

  1. Raji
    Curator

    Given, time of concentration (t) =30 min and also use the given formula for finding Intensity of Rainfall (Pc).

    Pc = 900 / (30+60) = 10 mm/hr = 1 cm/hr.

    Now, Use the rational formula for finding Quantity of storm run-off (Q).

    Q = (K*Pc*A)/36,
    = (0.45*1*12)/36,
    = 0.15 cumecs.

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