Question: Water from a storm drains flows over an outfall onto a porous bed which absorbs the water at a uniform vertical velocity of 8 mm/s,

Water from a storm drains flows over an outfall onto a porous bed which absorbs the water at a uniform vertical velocity of 8 mm/s, as shown in Fig. P3.19
The system is 5 m deep into the paper. Find the length L of bed which will completely absorb the storm water.

Initial depth = 40 cm 2 m/s

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