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The area of the forebay (''A<subf</sub>'') designed for 80 % capture efficiency (i.e. R = 0.8) may be calculated as:
The area of the forebay (''A<subf</sub>'') designed for 80 % capture efficiency (i.e. R = 0.8) may be calculated as:
:<math>A_{f}=\frac{12\times Q}{V_{f}}</math>
:<math>A_{f}=\frac{12\times Q}{V_{f}}</math>
}}
}}
Check that the forebay depth (''d<sub>f</sub>'') ≤ 0.3 m:
Check that the forebay depth (''d<sub>f</sub>'', m) ≤ 0.3 m:
: <math>d_{f}=\frac{V_{f}}{A_{f}}</math>
: <math>d_{f}=\frac{V_{f}}{A_{f}}</math>
===Example calculation===