We need to obligatorily have ventilation in triangular notch.

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Rectangular notch may or may not have ventilation.

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The head of water over a rectangular notch is 700 mm. The discharge is 200 litres/s. Find the length of the notch, when CD =.63

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The expression for discharge for a right angled notch is more complex than rectangular notch.

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A notch is a device used to measure the turbulence of the flowing liquid directly.

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The notch is bigger in size than wier.

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The MoM (Material of Manufacture) of notch is,

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In discharge of water over narrow crested weir, discharge is directly proportional to the cube root of acceleration due to gravity.

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In Bazin’s formula, the discharge is inversely proportional to the length of weir.

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In discharge of water over Ogee weir, discharge is directly proportional to the first power of length.

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Find the discharge through a rectangular orifice 3.2 m wide and 1.7 m deep fitted to a easier tank. The water level in a team is 3.3 m above the top edge of orifice. Take Cd = 0.6

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What is the reduction in crest length due to each end contraction?

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In discharge of water over narrow crested weir, head of water is directly proportional to Discharge Coefficient.

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The time taken to empty the tank is independent of Cd but depends only on the height and acceleration due to gravity.

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Find the discharge through totally drowned orifice of width 3.3 m if the difference of water levels on both side of the orifice be 50 cm. The height of water from to and bottom of the orifice are 2.25 m and 2.67 m respectively.

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In Francis empirical expression for discharge, the relation between head of water and discharge is

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