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*''R'' = The capture efficiency (suggest 0.8),
*''R'' = The capture efficiency (suggest 0.8),
*''L<sub>o</sub>'' = The sediment loading rate (m³/Ha/yr), and
*''L<sub>o</sub>'' = The sediment loading rate (m³/Ha/yr), and
*''F<sub>c</sub> = The cleanout frequency (yrs)
*''F<sub>c</sub>'' = The cleanout frequency (yrs)
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{{plainlist| 1=Where:
{{plainlist| 1=Where:
*''Q'' = Design flow rate (m³/s)
*''Q'' = Design flow rate (m³/s)
*''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:
: <math>d_{f}=\frac{V_{f}}{A_{f}}