Rectangular notch
Discharge over a rectangular notch
Theory
Consider a rectangular notch in one side of a tank over which water is flowing as shown in figure.
- H = Height of water above sill of notch
- b = Width or length of the notch
- Cd = Coefficient of discharge
Example:
[metric]
Example - Discharge over a rectangular notch
Problem
A rectangular notch 0.5m wide has constant head of 400 mm. Find the discharge over the notch in liters per second, if the coefficient of discharge for the notch is 0.62.
Workings
Given,

- b = 0.5 m
- H = 400 mm = 0.4 m
- Cd = 0.62
Solution
Discharge over the notch = 231 liters/s
Last Modified: 19 Jan 12 @ 05:12 Page Rendered: 2022-03-14 17:40:28