Developed by Environmental Protection Agency's (EPA) Water Supply and Water Resources Division, EPANET is software that models water distribution piping systems. It is a Windows 95/98/NT/XP program that performs extended-period simulation of the hydraulic and water quality behavior within pressurized pipe networks.
Go to: Program-->EPANET2.0
There is a tutorial for this software that goes together the the software itself. Please refer to the tutorial on how to use this since there are a number of examples in the tutorial.
Additional help can be found here on the Environmental Protection Agency website.
Engineering Building
428 S. Shaw Lane, Room Number 1325
East Lansing, MI 48824
Phone: 517-353-8891
support@egr.msu.edu