What are Spillways for Dams ? Why are they Required ?

What are Spillways for Dams ? Why are they Required ?

Spillways are generally provided to allow the surplus discharge, during floods and other unexpected conditions,  from the upstream side of the reservoir to the downstream. This is nothing but the overflow portion of the dam. It is also called by the name “surplussing work“. According to Wikipedia, A spillway is a structure used to provide the controlled…