Hydraulic modeling of water distribution systems
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Hydraulic Modeling of Water Distribution Systems. Grady Hillhouse M. Eng. Water Resources Engineering Texas A&M University. Introduction. A large percentage of EWB projects involve water. Many of these project include a transmission or distribution component.

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Hydraulic modeling of water distribution systems

Hydraulic Modeling of Water Distribution Systems

Grady Hillhouse

M. Eng. Water Resources Engineering

Texas A&M University


Introduction
Introduction

  • A large percentage of EWB projects involve water.

  • Many of these project include a transmission or distribution component.

  • A basic understanding of pressure conduit hydraulics is essential when designing water infrastructure.

  • In situations where solving pipe networks is too complex, modeling becomes necessary.


Outline
Outline

  • Introduction to pressure conduit hydraulics

  • Introduction to EPA NET

  • Basics of Modeling

  • Only an introduction

  • If you have questions, ask!


Pressure conduit hydraulics
Pressure Conduit Hydraulics

  • Summed up in two equations:

constant


Head loss
Head Loss

  • Darcy-Weisbach head loss equation




Solving pipe networks
Solving Pipe Networks

  • Continuity at nodes


Solving pipe networks1
Solving Pipe Networks

  • Fixed grade node paths


Solving pipe networks2
Solving Pipe Networks

  • Loop Equations


Hydraulic grade line
Hydraulic Grade Line

  • Total energy less velocity head


Epanet
EPANET

  • Public domain (free!)

  • Relatively simple

  • Uses the gradient method to solve pipe networks for flows and pressures.


Components in models
Components in Models

  • Node – junction between other model elements. Can have external demands.

  • Pipe – convey water between nodes.

  • Reservoir – infinite source of water with a constant or periodically changing water surface elevation.

  • Tank – stores water . Water surface is at atmospheric pressure.

  • Pumps – impart energy to water

  • Valves – various methods of controlling flow or pressure


Skeletonization
Skeletonization

  • Depending on the complexity of the system you’re modeling, in may benefit you to simplify the model.


What you provide the model
What you provide the model

  • Layout and parameters of infrastructure

  • Demands

  • Initial conditions


What the model provides for you
What the model provides for you

  • Flow rates in pipes and tanks

  • Pressures at nodes



Final notes
Final Notes

  • A model is only as good as the input data you provide.

  • Reference the user’s manual!

  • Never ask the model to do something you don’t understand.

  • Always verify results by checking with hand calculations.

  • Questions?


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