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V-Notch - The Hong Kong Polytechnic University Department...

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The Hong Kong Polytechnic University Department of Civil and Structural Engineering Fluid Mechanics Laboratory Report V-notch Subject: Fluid Mechanics, CSE202 Lecturer: Dr. K.W. Chau Team members 1. Dai Yifeng, 07000414x 2. Shao Qian, 07001042x 3. Hu Jiaqi, 07002407x 4. Gang Rui,07002339x Introduction In hydraulic engineering, weirs are commonly used to regulate flow in rivers and
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other open channels. Where the relationship between the water level upstream of the weir and the discharge is known, the discharge at any time may be found by noting the upstream water level. Fig. 1 shows a V-shaped notch weir, in vertical plate. Such notches usually have sharp edges so that the water springs clear of the plate as it passes through the notch. Objective To determine the relationship between the discharge and the water level of a V-notch weir. Theory The discharge of a V-notch weir is given by Q = C d 2 5 tan 2 15 8 H g θ where Q = discharge (m 3 /s), C d = coefficient of discharge, θ = half-angle of the V- notch, H=water level measured from the vertex of the V-notch.
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