What is main spillway?
Main spillways or service spillways They are masonry or concrete structure which functions for a designed flood in the rainy season. The main spillway can be constructed either within the body of a dam or at one end of it independently in a saddle in an away from the dam.
Which is simplest type of spillway?
trough spillway
The trough spillway or chute spillway is the simplest type of a spillway which can be easily provided independently and at low costs. It is lighter and adaptable to any type of foundations and hence provided easily on earth and rockfill dams.
What is spillway and its functions?
Function: Spillway are provided for storage and detention dams to release surplus or flood water which cannot be contained in the allotted storage space and at diversion dams to by-pass flows exceeding those which are turned into the diversion dam.
What is spillway crest?
Spillway crest means the elevation of the floor of a spillway, grade control structure, or ogee crest above which spillway flow begins.
What is spillway or Weir?
A spillway is a structure used to provide the controlled release of water flow from a dam. It also allows the passage for surplus water over or around a dam when the reservoir itself is full.
What is mechanical spillway?
A mechanical spillway is provided in the embankment type pond to let out water from the storage in a regulated manner. To protect the embankment from over topping due to unexpected inflows into the storage, an emergency spillway is located on one end of the embankment.
Which is called safety valve of a dam?
Explanation: A spillway is essentially a safety valve for the dam and must be properly designed. It should have adequate capacity to dispose off the entire surplus water from upstream to downstream at the time of the arrival of the worst design flood.
What is chute spillway?
Chute spillway is an open channel like structure, which is constructed on steep slope of the gully face with a suitable inlet and outlet. It usually consists of an inlet, vertical curve section, steep-sloped channel and outlet. The major part of the drop in water surface takes place in a channel.
What are the components of spillway?
Components of a Spillway | Irrigation
- Component # 1. Control Structure:
- Component # 2. Conveyance Structure:
- Component # 3. Terminal Structure:
- Component # 4. Entrance and Exit Channel:
What is overflow dam?
a dam designed for raising the water level of rivers or for creating a reservoir; it permits the overflow of water during the passage of excess (flash-flood) discharges over the entire length of the dam crest or through drain openings.
What is shaft spillway?
A shaft spillway is sometimes called a “morning glory” spillway. It is a hollow tower or shaft, usually circular, which has a funnel at its top. When the reservoir level rises above the top of the spillway, the water flows over its sides and down into the shaft. At the bottom of the shaft, it enters a tunnel.