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Please solve the question in detail 2. Water is being filtered in 0.8m deep sand filter having a porosity of 0.35 at rate of 10m/h.

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Please solve the question in detail

2. Water is being filtered in 0.8m deep sand filter having a porosity of 0.35 at rate of 10m/h. Detenuine the depth of expdnded bed and velocity of backwahhing if the porosity of expeanded bed is to be 0.7. If it is going to be backwashed for 15 minutes, what is the quantity of water required for single back washing

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