Weir

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Weir and dursopipe.jpg
Example of a weir to be used for an overflow.


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Introduction

A weir is a barrier, typically a panel of glass, that holds back a body of water. The water can then flow over the top of the barrier, with a constant water level then being maintained behind / above the weir.

They are most commonly used in marine aquariums to construct an overflow for the display tank (allowing surface skimming and constant water level) or to be used within a sump to separate components / equipment (particularly to provide an area which changes water level with evaporation for evaporation top off).

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