Principles and Practice of Engineering (PE) Civil: Water Resources and Environmental (WRE) Practice Exam 2025 – All-in-One Resource to Master Your PE Exam!

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What is the discharge coefficient for a 900 v-notch weir?

1.75

2.54

The discharge coefficient for a v-notch weir, also known as a triangular weir, varies based on the geometry and flow characteristics but is commonly referenced in hydrology and fluid mechanics. For a 900 v-notch weir, the standard discharge coefficient is typically about 2.54, representing the relationship between the actual flow rate and the theoretical flow rate through the weir.

This coefficient takes into account factors such as the weir's geometry, the velocity of the flow, and the effects of turbulence. A coefficient of 2.54 is widely accepted in hydraulic engineering for a sharp-edged 900 v-notch weir under certain conditions, making it essential for accurate calculations in flow measurement applications.

Other coefficients listed, such as 1.75, 3.14, and 4.00, do not correspond to the accepted norms based on empirical data for a 900 v-notch weir, hence they are not appropriate for this scenario.

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3.14

4.00

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