Developing hydraulic and water quality equivalent systems

A. Raczynski, W. Kirkpatrick, D. Rehnstrom, P. Boulos, K. Lansey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Water distribution system modelers organize system models by balancing model complexity and the effort to set up, solve and calibrate the model. The modeling goal is to represent the true system in the field with the least effort and calibration data. As a model increases in complexity as measured by the number of nodes and pipes, more field data is needed to estimate model parameters and the error associated with that model error increases. On the other hand, a simplified model may not capture the full system under all conditions. In terms of water quality, prevailing thought is that an "all-pipe" model is necessary. Here we examine the use of hydraulic equivalent systems on water quality estimates as represented by water age. A simple system is used to demonstrate the effect of applying existing series and parallel pipe simplification approaches. Although these methods preserve pressure conditions, water age is not and increasing levels of system reduction results in larger errors. We then demonstrate that a two step process can insure hydraulic and water quality equivalence for the full range of flows. This study demonstrates that a model skeletonized based on hydraulics to remove or reduce pipes must be re-calibrated for water quality at each level of model simplification.

Original languageEnglish (US)
Title of host publicationContemporary Topics in Ground Modification, Problem Soils, and Geo-Support - Proceedings of Selected Papers of the 2009 International Foundation Congress and Equipment Expo
Pages844-851
Number of pages8
Edition187
DOIs
StatePublished - Dec 1 2009
EventContemporary Topics in Ground Modification, Problem Soils, and Geo-Support - 2009 International Foundation Congress and Equipment Expo - Orlando, FL, United States
Duration: Mar 15 2009Mar 19 2009

Publication series

NameGeotechnical Special Publication
Number187
ISSN (Print)0895-0563

Other

OtherContemporary Topics in Ground Modification, Problem Soils, and Geo-Support - 2009 International Foundation Congress and Equipment Expo
CountryUnited States
CityOrlando, FL
Period3/15/093/19/09

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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    Raczynski, A., Kirkpatrick, W., Rehnstrom, D., Boulos, P., & Lansey, K. (2009). Developing hydraulic and water quality equivalent systems. In Contemporary Topics in Ground Modification, Problem Soils, and Geo-Support - Proceedings of Selected Papers of the 2009 International Foundation Congress and Equipment Expo (187 ed., pp. 844-851). (Geotechnical Special Publication; No. 187). https://doi.org/10.1061/41023(337)73