Flow (\( Q = 2CLh\sqrt{2gh} \) or \( Q = 2CLh^{3/2}gh \)):

Where:

• \( Q \) is the discharge, in cubic meters per second (m³/sec).
• \( C \) is the coefficient of roughness.
• \( L \) is the length of the crest, in meters (m).
• \( h \) is the depth of water, in meters (m).
• \( g \) is the acceleration due to gravity, approximately 9.81 m/sec² (or 32.2 ft/sec²).