Correct Answer - Option 1 : Straight Drop Spillway
Explanation:
Spillway :
A spillway is a hydraulic structure built at a dam site for diverting the surplus water from a reservoir after it has been filled to its maximum capacity.
Straight Drop Spillway:
A straight drop spillway consists of low height weir wall having its downstream face roughly or perfectly vertical straight drop spillway are most suitable for thin arch dams, earthen dams, or bands.
Ogee Spillway:
Ogee Spillway, as the name says, represents the shape of the downstream face of the weir. These are most commonly used in the case of gravity dams, arch dams, buttress dams etc.
Shaft spillway:
Shaft spillway is recommended when there is no space to provide for other types of spillways
