online dic on dam & address of sites about dam basic knowledge

I would like to get some basic knowledge about dam and related
structures like spillway, water intake, outlet works and phrases
related to their design phase.
I have got the following site
http://www.dur.ac.uk/ which is Developed by 
Andrew Graham, 
MEng student, 
University of Durham
(1997)  

If you know anyother good educational site, which describes the basics
which sketch or photos, let me know.

TIA RAsoul Khoshravan Azar