Introduction to Water Distribution System Analysis CE 572 Urban Water Systems AnalysisLarry A. Roesner, Ph.D., P.E.Fall 2008

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History of Water Distribution System Analysis1936: Hardy Cross steady state iterative algorithm solvable with slide rule 1960s: Computerized Hardy Cross Models Woods KYPIPE (early 1970s)Late 1970s: Optimization algorithms (Alperovits and Shamir) and large system simulation capability (1,000s of pipes)1990s: Transient analysis on complex systems (water hammer)1993: EPANet Lew Rossman1996: H20Net MWH Soft, Inc (EPANet with GUIs and CAD interface)

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Definitionswater distribution systempipes, pumps, valves, and tanksjunction nodessteady stateextended period simulation (EPS)dynamic (unsteady) water quality modelingtransient analysis

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Modeling PhilosophySystem analysis to develop or improve a water distribution system taking into account:CostTimeSafetyEase of modificationOperationAid to communicationThe dilemma: simplicity vs. accuracy

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Model DevelopmentFormulation (conceptual analysis)CalibrationVerification, Validation, ConfirmationRefinement

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Problems of ModelingComplexity of the real systemCalibration and dataSensitivityNumerical algorithms and methodsAdaptation of the model to the real systemNesting of submodels

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Model Formulation

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Basic Terms in the Energy Equation

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Solution of the Energy Equation

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Problem

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Solutions

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H2ONET Solution

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EPANEThttp://www.epa.gov/nrmrl/wswrd/dw/epanet.html#toolkit

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RD 4 EPANET IntroductionAccess the EPANET Webpage and read the introductory material about the modelDownload EPANET from the Web or access it from ENS Engineering ApplicationsBrowse the EN2manualRun the TutorialDue by Tuesday Sept 23rd

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