Please help find energy efficiency numbers for hydroelectricity?

Question

We're doing a science project and we desperately need numbers for hydroelectric energy efficiency... like how much actually goes into making power and is not wasted? If you find anything please provide a source, thank you!

it is extremely hard to find numbers, so numbers and figures relating to hydroelectricity not envolved with energy efficiency is apppreciated. Thank you!

Answer 1

I will be giving you some references as links, get 'er done

the fourth one below gives you some calculations that may be helpful

the last one gives you the losses you wanted