scholarly journals Demand uncertainty in modelling water distribution systems

Urban Water ◽  
2012 ◽  
Author(s):  
I. Vertommen ◽  
R. Magini ◽  
M. da Conceição Cunha
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Demand Uncertainty ◽  
Water Distribution Systems

scholarly journals Least-cost design of water distribution systems under demand uncertainty: the robust counterpart approach

2013 ◽  
Vol 15 (3) ◽  
pp. 737-750 ◽  
Author(s):  
Lina Perelman ◽  
Mashor Housh ◽  
Avi Ostfeld
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Demand Uncertainty ◽  
Optimization Technique ◽  
Water Distribution Systems ◽  
Extended Period ◽  
Deterministic Equivalent ◽  
Robust Counterpart ◽  
Uncertainty Set ◽  
Ellipsoidal Uncertainty

In this study, a non-probabilistic robust counterpart (RC) approach is demonstrated and applied to the least-cost design/rehabilitation problem of water distribution systems (WDSs). The uncertainty of the information is described by a deterministic user-defined ellipsoidal uncertainty set that implies the level of risk. The advantages of the RC approach on previous modelling attempts to include uncertainty are in making no assumptions about the probability density functions of the uncertain parameters and their interdependencies, having no requirements on the construction of a representative sample of scenarios, and the deterministic equivalent problem preserves the same size (i.e. computational complexity) as the original problem. The RC is coupled with the cross-entropy heuristic optimization technique for seeking robust solutions. The methodology is demonstrated on an illustrative example and on the Hanoi network. The results show considerable promise of the proposed approach to incorporate uncertainty in the least-cost design problem of WDSs. Further research is warranted to extend the model for more complex WDSs, incorporate extended period simulations, and develop RC schemes for other WDSs related management problems.

Towards more resilient and adaptable water distribution systems under future demand uncertainty

2013 ◽  
Vol 13 (6) ◽  
pp. 1495-1506 ◽  
Author(s):  
Raziyeh Farmani ◽  
David Butler
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Demand Uncertainty ◽  
Water Distribution Systems ◽  
Evaluation Methodology ◽  
Network Building ◽  
All Solutions ◽  
Multistage Design ◽  
Major Reduction

The focus of this paper is on how water distribution systems can be made more resilient and adaptable, thus reducing their vulnerability to future changes. A performance evaluation methodology is outlined and used to assess the resilience of today's water infrastructure and its vulnerability to future changes, based on adopting four future scenarios, suitably adapted to represent future water demand states. The results highlight the sensitivity of key performance indicators to a range of future conditions relative to current conditions. The concept of future proofing is introduced and three strategies compared to design/re-design and operate the network, building in varying degrees of adaptive capacity to deliver solutions that are feasible under both today's and tomorrow's conditions. The key findings are that, without any intervention, all solutions are feasible when demand is equal to or less than the design case while resilience of the system improves for small decrease in demand, major reduction in demand shows a big improvement in water quality. Three future proofing strategies, namely operation, designed in operation and multistage design and operation show great potential to create flexibility that allows for operational diversity in the short term while trying to achieve long-term goals. The multistage design and operation strategy is able to outperform the other two strategies considering reduction in cost and improvement in performance of the system.

An Ontological Approach to Water Distribution Systems Management

WRPMD'99 ◽  
1999 ◽  
Author(s):  
P. Costa ◽  
A. Esposito ◽  
C. Gualtieri ◽  
D. Pianese ◽  
G. Pulci Doria ◽  
...  
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems ◽  
Systems Management ◽  
Ontological Approach

Robust Estimation of Integrated Hydraulics and Parameters in Water Distribution Systems

2001 ◽  
Author(s):  
Mietek A. Brdys ◽  
Kazimierz Duzinkiewicz ◽  
Michal Grochowski ◽  
Tomasz Rutkowski
Keyword(s):  
Robust Estimation ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems
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