On what factor in case of branch canals, the construction site for a fall depends?

On what factor in case of branch canals, the construction site for a fall depends? Correct Answer Commanded Area

By considering the commanded area of a branch canal or a distributary canal the location for the falls is decided. The procedure is to fix the FSL needed at the head of the off taking channels and outlets. Thus the FSL can be marked at all commanded points and hence deciding appropriate locations for the falls in canal FSL and therefore in canal beds.

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