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Direct runoff from a flood over a basin of area 50 hectare was observed as 25000 m3 during a storm. The equivalent depth of rainfall over the basin was 97 mm. The time distribution of the rainfall during the storm is given below. Determine the ϕ−index for the storm. Time(hr.)01234567Rainfall(mm)0.06.011.034.028.012.06.00.08.75

Answer» Direct runoff from a flood over a basin of area 50 hectare was observed as 25000 m3 during a storm. The equivalent depth of rainfall over the basin was 97 mm. The time distribution of the rainfall during the storm is given below. Determine the ϕindex for the storm.

Time(hr.)01234567Rainfall(mm)0.06.011.034.028.012.06.00.0
  1. 8.75


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