A bridge has to be sited on a stream where catchment area is 100 times of sum of last four digits of your roll number in hectare, length of catchment area is Sum of last two digits of your roll number in Km and fall in level from critical point to bridge site is 130 m. The severest storm, as recorded dropped 16 cm of rain in 2 hrs. If basin of stream is loamy soil. Calculate the peak runoff for designing the bridge. Given coefficients: p = 0.29 and f = 0.87.
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Catchment-Run-Off Method: The catchment area is the command area of a river wherefrom the river gets the supply of water. The catchment area is computed from the contour map and the flood discharge is estimated from the “Run-off ” formula. The rainfall is measured by rain gauges in millimetre.
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