CE 3372 Water Systems Design Pipe Networks

Networks Spreadsheet Example – Representative of a “by-hand” solution. EPA NET Program Introduction – Representative of a “professional-type program” solution.

Networks – Why Model? What is the flow distribution if the demands are changed as shown? 0.1 cfs 0.4 cfs

Sketch and Label

Node-Arc Incidence Matrix

Energy Losses in Loop Determine “sign” for loop equations from loop traverse direction and assumed flow directions.

Build a Computation Tool

What If? Once the tool is built, then “what-if” questions can be posed (as per example). – Next repeat the exercise using EPA-NET

Networks EPA Net (Computer Program) – Performs extended period simulation of hydraulic and water quality behavior within pressurized pipe networks. – Provides an integrated environment for editing network input data, running hydraulic and water qresults in a variety of formats.

Networks EPA Net (Computer Program) – Computes friction head loss using either Hazen- Williams, Darcy-Weisbach, or Chezy-Manning equations. Includes minor head losses for bends, fittings, etc. – Models constant or variable speed pumps. – Computes pumping energy and cost. – Models various types of valves including shutoff, check, pressure regulating, and flow control valves

Networks EPA Net (Computer Program) – Allows storage tanks to have any shape (i.e., diameter can vary with height). – Considers multiple demand categories at nodes, each with its own pattern of time variation – Models pressure-dependent flow issuing from emitters (sprinkler heads) – Base system operation on both simple tank level or timer controls and on complex rule-based control

Networks EPA Net (Computer Program) – EPANET models a water distribution system as a collection of links connected to nodes. The links represent pipes, pumps, and control valves. The nodes represent junctions, tanks, and reservoirs.

Networks – Why Model? Illustrative Example: – What is the flow distribution if the demands are changed as shown? 0.1 cfs 0.4 cfs

Example in EPA NET Install and open EPA-NET – How to install on the server as a movie. Create a new project – Ce3372_epanet_example1 Check defaults. Import the backdrop (optional)