Weir Design  Design of Weir  Conditions for Stability, Maximum stress 

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In any hydropower projects the diversion structures occupies the key position. Among these diverging structures weir is the most commonly used structure, because of its simple design and operation. Different types of weir can be used as diverging structures some of them are given below:
Lets consider a general case of weir design. 
Forces on WeirThe forces acting on a weir built on a impervious foundation may be static or dynamic. The static forces include.
The dynamic forces acting on weir includes.
Conditions for Stability of WeirsThere are some conditions that are required to be satisfied for the stability of the weir. These includes:
Condition of Maximum Stress on WeirIn the case of a dam the condition for maximum stress is when the water level above the base is maximum. i. e. when the head is maximum. But in case of a weir design, when the discharge increases the near water level also builds up and the difference between them will become less and less. So, the weir is subjected to maximum head when the water level on the upstream side is maximum and no water passes over the crest. 