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:<math>A_{f}=\frac{12\times Q}{V_{f}}</math>
:<math>A_{f}=\frac{12\times Q}{V_{f}}</math>
{{plainlist| 1=Where:
{{plainlist| 1=Where:
*''Q'' = Design flow rate (m³/s)
*''Q'' = Design flow rate (m³/s), and
*''V<sub>f</sub>'' = Volume of forebay (m³).}}
*''V<sub>f</sub>'' = Volume of forebay (m³).
}}
Check that the forebay depth (d<sub>f</sub>) ≤ 0.3 m:
Check that the forebay depth (d<sub>f</sub>) ≤ 0.3 m: