Q1: The thickness of a sharp crested weir is kept less than

ANS:B - one-half of the height of water on the sill

In the case of a sharp-crested weir, the thickness of the weir is not typically kept at one-half of the height of water on the sill. The common design practice is to keep the thickness of the weir much smaller compared to the height of water on the sill. A sharp-crested weir is designed to have a thin leading edge so that the flow over the weir is relatively unaffected by the weir itself. This design allows for accurate measurement of flow rates based on the height of water flowing over the weir. Therefore, the correct design consideration for the thickness of a sharp-crested weir is indeed to keep it less than one-third of the height of water on the sill, not one-half as previously stated. Thank you for your understanding.