Outlet Structures

Effluent structures are designed to do the following:

• Provide uniform distribution of flow over a large

• Minimize lifting of the particles and their escape into the effluent

• Reduce floating matter from escaping into the effluent

The most common effluent structures for rectangular and circular tanks are weirs that are adjustable for leveling. These weir plates are long enough to avoid the high heads that can result in updraft currents and particle lifting.

Both straight-edge and V notches on either one or both sides of the trough have been used in rectangular and circular tanks. V notches provide uniform distribution at low flows. A baffle in front of the weir stops floating matter from escaping into the effluent. Normally, weirs in rec-

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