CE 3372 Water Systems Design

EPA-NETPumps, Valves, Tanks

Pumps

• Special Link in EPA-NET• Add head to the system between nodes• One directional • Provide a pump performance curve• If system needs more head than pump can provide,

then EPANET shuts pump off• If more flow is required, then curve is extrapolated– Pg 32, 33 of user manual

Valves

• Special link that limit pressure of flow at specific point in network

• Different types– Pressure reducing valve– Pressure sustaining valve– Flow control valve– Throttle control valve• Pg 33,34 of user manual

Tanks

• Nodes with storage capacity;• Similar to reservoir except can fill and drain– Lower/upper fill depths

Demand Patterns

• Can vary demand according to a time pattern• Called “Extended Period Simulation”– Sequence of steady states

Examples

• Pump and Storage Tank• Remove Storage Tank• Replace Storage Tank, add flow control valve• Pressure Reducing Valve• Extended Period Simulation– Will do these in-class, bring your computer if

possible.