If the rectangular tank full of water in the figure below has its right-hand wall lowered...

    

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If the rectangular tank full of water in the figure below has its right-hand wall lowered by an amount 8, as shown, water will flow out as it would over a weir or dam. The outflow Qis given by Q=Cbg¹/283/2 where b is the tank width into the paper, g is the gravitational acceleration, and C is a dimensionless constant. Assume that the water surface is horizontal, not slightly curved as in the figure. Let the initial excess water level be do. Derive a formula for the time required to reduce the excess water level to (a) do/10 and (b) zero. S L θα δ3/2 If the rectangular tank full of water in the figure below has its right-hand wall lowered by an amount 8, as shown, water will flow out as it would over a weir or dam. The outflow Qis given by Q=Cbg¹/283/2 where b is the tank width into the paper, g is the gravitational acceleration, and C is a dimensionless constant. Assume that the water surface is horizontal, not slightly curved as in the figure. Let the initial excess water level be do. Derive a formula for the time required to reduce the excess water level to (a) do/10 and (b) zero. S L θα δ3/2