This video presentation describes the features of the downward opening weir gate from Plasti-Fab of Oregon.
http://www.plasti-fab.com/wastewater-products/weir-gate
The function of a down-opening weir gate is to control the upstream water level, and/or pace the amount of discharge from a water system. At times there will be a level control sensor in the system which is directly connected - controlling a modulating electric operator to automatically pace the amount of flow discharged and/or maintain a constant upstream water depth.
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