Spillways

What is spillway? Classify it as per the pertinent features. Discuss ogee spillway with a neat sketch.

An overflow spillway is $60\ \text{m}$ long, with a crest elevation of $133\ \text{m}$ and a reservoir water surface elevation of $135\ \text{m}$. Calculate the discharge over the spillway, assuming a discharge coefficient of 0.74.

List out any five types of spillway used in hydropower projects in the dam reservoir system. Explain briefly the most suitable type of spillway in the context of Nepalese river site.