online_rectangular_weir: Calculation of discharge
through a rectangular weir
Head H on the weir, in m [or ft]
Length L of the weir, in m [or ft]
Width B of the channel, in m [or ft]
Height P to the weir crest, in m [or ft]
Ce is a function of H/P and
kb is a function of
Discharge Q in L/s [or cfs]
See USBR Manual for general methodology
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