Robust Algorithm for Head-Dependent Analysis of Water Distribution Systems
Publication: Water Distribution Systems Analysis 2008
Abstract
In a water distribution system (WDS), low pressure situations can arise for a variety of reasons. For example, over time, the demands may exceed the capacity of the WDS or some major components e.g. pumps and trunk mains may not be operational while repairs are carried out. The extent to which demands are satisfied in a WDS is governed by the actual amount of pressure in the system and pressure-deficient operating conditions are not uncommon. Despite this, the conventional modelling approach works well only under fully satisfactory pressure regimes, with results for subnormal pressure conditions often being inaccurate, misleading and even unreasonable. Sample results for a prototype FORTRAN computer program which can perform head-driven analysis using a globally convergent Newton-Raphson scheme are presented. Extensive testing has shown that the program is efficient and robust. It is demonstrated here that head-driven analysis is not computationally more time consuming than demand-driven analysis and that different functions for head-dependent nodal outflows can produce significantly different results.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Algorithms
- Analysis (by type)
- Computer analysis
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Equipment and machinery
- Hydraulic models
- Infrastructure
- Mathematics
- Models (by type)
- Network analysis
- Pipeline systems
- Pipes
- Pressure (type)
- Pressure distribution
- Pressure pipes
- Pumps
- Solid mechanics
- Water and water resources
- Water management
- Water pressure
- Water supply
- Water supply systems
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