Select the option that is appropriate regarding the following two statements labelled Assertion and Reason.
Assertion: A gravity weir is the one in which uplift pressure caused by seepage of water below the floor is resisted entirely by the weight of the floor.
Reason: In the non-gravity type weir, the floor thickness is kept relatively less and the uplift pressure
is largely resisted by the bending action of the reinforced concrete floor.

Correct option is D

When the weight of the weir balances the uplift pressure caused by the head of the water seeping
below the weir, it is called a Gravity weir.
• 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.