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Gravity and Non-Gravity Weirs

weir and types is essential part of discussion this document is uploaded for downloading purpose only. do not download to waste the time

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947 views1 page

Gravity and Non-Gravity Weirs

weir and types is essential part of discussion this document is uploaded for downloading purpose only. do not download to waste the time

Uploaded by

Desktop Nepal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Gravity and Non-gravity weirs:

When the weight of the weir (i.e. its body and floor) balances the uplift pressure caused by the head
of the water seeping below the weir, it is called a gravity weir.
On the other hand, if the weir floor is designed continuous with the divide piers as reinforced
structure, such that the weight of concrete slab together with the weight of divide piers keep the
structure safe against the uplift then the structure may be called as a non-gravity weir.

o In the latter case, RCC is to be used in place of brick piers


o Considerable savings may be obtained, as the weight of the floor can be much less than what is
required in gravity weir.

Types of weirs
(a) Masonry weirs with vertical drop
(b) Rock-fill weirs with sloping aprons
(c) Concrete weirs with sloping glacis

Masonry weirs with vertical drop


Masonry weir wall is constructed over the impervious floor. Cut-off walls are provided at both ends
of the floor. Sheet piles are provided below the cut off walls. The crest shutters are provided to raise
the water level, if required. The shutters are dropped down during flood. The masonry weir wall may
be vertical on both face or sloping on both face or vertical on downstream face and sloping in
upstream face.

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