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Introduction to Water Distribution System Analysis

Introduction to Water Distribution System Analysis. CE 572 – Urban Water Systems Analysis Larry A. Roesner, Ph.D., P.E. Fall 2008. History of Water Distribution System Analysis. 1936: Hardy Cross – steady state iterative algorithm solvable with slide rule

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Introduction to Water Distribution System Analysis

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

  2. History of Water Distribution System Analysis • 1936: Hardy Cross – steady state iterative algorithm solvable with slide rule • 1960’s: Computerized Hardy Cross Models  Wood’s KYPIPE (early 1970’s) • Late 1970’s: Optimization algorithms (Alperovits and Shamir) and large system simulation capability (1,000s of pipes) • 1990’s: Transient analysis on complex systems (water hammer) • 1993: EPANet – Lew Rossman • 1996: H20Net – MWH Soft, Inc (EPANet with GUIs and CAD interface)

  3. Definitions • water distribution system • pipes, pumps, valves, and tanks • junction nodes • steady state • extended period simulation (EPS) • dynamic (unsteady) water quality modeling • transient analysis

  4. Modeling Philosophy • System analysis to develop or improve a water distribution system taking into account: • Cost • Time • Safety • Ease of modification • Operation • Aid to communication • The dilemma: simplicity vs. accuracy

  5. Model Development • Formulation (conceptual analysis) • Calibration • Verification, Validation, Confirmation • Refinement

  6. Problems of Modeling • Complexity of the real system • Calibration and data • Sensitivity • Numerical algorithms and methods • Adaptation of the model to the real system • Nesting of submodels

  7. Model Formulation

  8. Basic Terms in the Energy Equation

  9. Solution of the Energy Equation

  10. Problem

  11. Solutions

  12. H2ONET Solution

  13. EPANET http://www.epa.gov/nrmrl/wswrd/dw/epanet.html#toolkit

  14. RD 4 – EPANET Introduction • Access the EPANET Webpage and read the introductory material about the model • Download EPANET from the Web or access it from ENS “Engineering Applications” • Browse the EN2manual • Run the Tutorial • Due by Tuesday Sept 23rd

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