63.
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

64.
If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by

65.
Borrow pits should preferably be located in

69.
If $$\Delta $$ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

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