SEARCH. Home > Resources > Irrigation > Source of Irrigation > Diversion Weirs. DIVERSION WEIRS. Weir is a low obstruction that is built across a river or canal to raise the water level, or in parallel to divert the water. Two types of weirs are used to control flow; an in-stream weir and a diversion weir.
Also asked, what are Weir used for?
Weirs have traditionally been used to create mill ponds. They are also used to prevent flooding, measure discharge, and help render a river navigable. The crest of an overflow spillway on a large dam is often called a weir.
What is the difference between a dam and a weir?
What is the difference between a dam, a weir and a barrage? A weir is an impervious barrier constructed across a river to raise the water level on the upstream side. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway.
What is a weir in fluid mechanics?
Definition. A structure, used to dam up a stream or river, over which the water flows, is called a weir. The conditions of flow, in the case of a weir, are practically the same as those of a rectangular notch. That is why, a notch is, sometimes, called as a weir and vice versa.