The impacts of demand variability on distribution system hydraulics and transport

Xueyao Yang, Dominic L. Boccelli

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

4 Scopus citations

Abstract

A stochastic water demand generator (PRPsym) and a well known distribution system network solver (EPANET) were linked together to analyze the impact of water demand variability on the underlying hydraulics and transport in a distribution system. The modified EPANET example 2 network model was used as a template and test network model for both hydraulic and water quality simulations at three different temporal aggregations (1-hour, 10-minute, and 1-minute). The mean, standard deviation and coefficient of variation at each hour for both hydraulic and water quality parameters were calculated for all nodes or links. Results showed that decreasing temporal aggregation of the water demands leads to increased flow rate variability. The increase in flow rate variability is related to the increased demand variability and the localized flow reversals that alter the travel path. The increase in flow rate variability was more evident in the links located at edges of the system rather than the main trunk lines. In addition to the hydraulics, water age simulations - used as a water quality surrogate - indicate that increased demand variability can significantly impact water quality simulations by altering residence times and travel paths. These preliminary results suggest that there are likely portions of a distribution system where typical modeling assumptions do not adequately represent localized water quality conditions.

Original languageEnglish (US)
Title of host publicationProceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009
Subtitle of host publicationGreat Rivers
Pages187-198
Number of pages12
DOIs
StatePublished - 2009
Externally publishedYes
EventWorld Environmental and Water Resources Congress 2009: Great Rivers - Kansas City, MO, United States
Duration: May 17 2009May 21 2009

Publication series

NameProceedings of World Environmental and Water Resources Congress 2009 - World Environmental and Water Resources Congress 2009: Great Rivers
Volume342

Other

OtherWorld Environmental and Water Resources Congress 2009: Great Rivers
Country/TerritoryUnited States
CityKansas City, MO
Period5/17/095/21/09

ASJC Scopus subject areas

  • Environmental Science(all)

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