For open channel hydraulics, the definitive text is "Open-channel hydraulics" by V.T. Chow, ISBN 007085906X
For pipes and ducts, we use "Internal Flow Systems" by D.S. Miller. ISBN 0947711775
These are both high level books, expensive and sometimes difficult to get hold of. Any introductory university hydraulics book should give you enough background to understand these.
When you can understand hydraulics, work backwards through the works (unless you have supercritcal flow, then you work forwards) from the river top water level to the inlet chamber.
Good luck, and get some guidance from a peer.