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==Design==
==Design==
−1. The required volume for a small forebay, serving up to 2 Ha (''V<sub>f</sub>'', m³), may be calculated as:
+1. The required volume for a small forebay, serving up to 5 Ha (''V<sub>f</sub>'', m³), may be calculated as:
:<math>V_{f}=A_{c}\times R\times L_{o} \times F_{c}</math>
:<math>V_{f}=A_{c}\times R\times L_{o} \times F_{c}</math>