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Question: a submersible pump whose characteristics are given in the following...

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A submersible pump, whose characteristics are given in the following table, has been lowered to the bottom of a circular deep water pond 6 m in diameter. The pump is fitted with a discharge line 100 m in length and 20.5 cm in diameter. The line rises vertically from the pump and then lies on a horizontal surface, the coefficient of pipe friction is 0.0075. The water level in the pond was 4 m below the ground surface. Find the time required to reduce the water level by 16 m, assuming there is no inflow into the water pond.

Head (m):   30 25 20 15 10 5

Discharge (lit/sec): 10 70 1

I'm not sure how this table is used....

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