CLASSIFICATION OF SPILLWAYS

There are different types of spillways which have been designed by the engineers for different situations. Spillways are classified on the basis of discharging water from reservoir to the downstream end in a controlled and uncontrolled manner. Spillways are provided according to the topography for example on the steeper slopes, Chute spillway is provided and if there is no available space then Shaft spillway is provided. The spillways can be classified into different types based on the various criteria, as explained below

Classification based on purpose

1 Main (or service) spillway

2 Auxiliary spillway

3   Emergency spillway

 Classification based on control

             1 Controlled (or gated) spillway

             2 Uncontrolled (or un gated) spillway

Classification based on prominent feature

             1 Free over fall (or straight drop) spillway

             2 Overflow or Ogee spillway

             3 Chute (or open channel or trough) spillway

4  Side-channel spillway

5   Shaft (or morning glory) spillway

6 Siphon spillway

7 Conduit (or tunnel) spillway

8  Cascade spillway

9  Baffle Apron Spillway