Pipe hydraulic resistance correction in WDN analysis
- 1 March 2009
- journal article
- research article
- Published by Taylor & Francis Ltd in Urban Water Journal
- Vol. 6 (1), 39-52
- https://doi.org/10.1080/15730620802541623
Abstract
The analysis of a looped water distribution network, operating under pressure and in steady flow conditions, can be accomplished once the topology of the network, the geometry of the pipes, the water demands at the nodes and the head value of at least one node are known. In a water distribution network (WDN), water demands are assigned to the nodes, although in reality they are distributed along the pipes converging at such nodes. This classic assumption represents the total demand along a pipe as two lumped withdrawals at its terminal nodes. This paper demonstrates that the above approximation is wrong because it generates head loss errors which may be significant when network analysis is performed for calibration, system design, real-time operations, rehabilitation strategies, optimal operation studies, reliability analyses, etc. Therefore, an extension of the global gradient algorithm (GGA) for network analysis is proposed which entails a modified GGA permitting the effective introduction of the lumped nodal demands, and without forfeiting a correct physical representation of head losses, by means of a pipe hydraulic resistance correction.Keywords
This publication has 10 references indexed in Scilit:
- Pressure-Driven Demand and Leakage Simulation for Water Distribution NetworksJournal of Hydraulic Engineering, 2008
- Algorithm for Automatic Detection of Topological Changes in Water Distribution NetworksJournal of Hydraulic Engineering, 2008
- Schematic Models for Distribution Systems Design. I: Combination ConceptJournal of Water Resources Planning and Management, 1988
- A new objective function for analyzing hydraulic pipe networks in the presence of different states of flowMeccanica, 1983
- Reliability of Algorithms for Pipe Network AnalysisJournal of the Hydraulics Division, 1981
- Linear Theory Methods for Pipe Network AnalysisJournal of the Hydraulics Division, 1980
- Solving the Pipe Network Analysis Problem Using Optimization TechniquesManagement Science, 1978
- Hydraulic Network Analysis Using Linear TheoryJournal of the Hydraulics Division, 1972
- Graph-Theoretic Models for Pipe Network AnalysisJournal of the Hydraulics Division, 1972
- Water Distribution Systems AnalysisJournal of the Hydraulics Division, 1968