Discharge Characteristics of Overshot Gates

by Brian Wahlin, (A.M.ASCE),
John Replogle, (F.ASCE),

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


Overshot gates are becoming increasingly popular for controlling water levels in open channels because of the ability of the gates to handle flow surges with limited depth changes. While water level control is useful, operators also need to know the flow rate at each gate to better operate the system. Empirical equations were developed from laboratory testing to predict the discharge over leaf gates. These equations can ac curately determine the flow rate in the field of a properly ventilated free-flow overshot gate to within 6%. These equations are valid for values of measured head to weir height ratios less than 1.0 and for gate angles between 16 and 63, spanning the typical oper ating range. Additional equations can be used to pre dict the discharge of a submerged overshot gate; how ever, the degree of accuracy was not clearly defined.

Subject Headings: Gates (hydraulic) | Water discharge | Water level | Flow rates | Open channels | Laboratory tests | Empirical equations | Ventilation

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