The standard books, like King's and Henderson are good references to have in general, but I did not use them too much.
In preparing for the test, I found having a Civil Engineering Handbook (of which there are several) was useful, and the Lindeberg books, especially the sample problems books...
I know question had been around a couple of months, but it sounds interesting and here is my input.
I could think of a bunch of ways to do an intake, but to me the bigger issue is how you are going to handle conveyance. How is the water going to go from the intake through the dam? I assume...