Comparative analysis of two probabilistic pipe breakage models applied to a real water distribution system

2010 ◽  
Vol 27 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Stefano Alvisi ◽  
Marco Franchini
Keyword(s):  
Comparative Analysis ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Pipe Breakage

Water distribution network simulation by optimization approaches

2013 ◽  
Vol 13 (4) ◽  
pp. 1063-1079 ◽  
Author(s):  
M. Soltanjalili ◽  
O. Bozorg Haddad ◽  
S. Seifollahi Aghmiuni ◽  
M. A. Mariño
Keyword(s):  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Flow Analysis ◽  
Water Distribution Network ◽  
Distribution Networks ◽  
Pipe Breakage ◽  
Failure Conditions ◽  
Honey Bee Mating Optimization ◽  
Entire Network

When a fire-flow condition occurs and a nodal demand is excessive or when a pipe breaks, a water distribution system (WDS) may temporarily become deficient and unable to satisfy all nodal demands. Thus, estimation of the influences of failure conditions on the network is needed. A method for analyzing the hydraulic condition of the network in such a situation is proposed. The method, which is constructed based on the amount of supply on each consumption node, is called node flow analysis (NFA). Given the limitations of the NFA method proposed earlier for determining optimal solutions, such as inflexibility of the approach toward more complicated problems and its time-consuming process, this paper presents the honey-bee mating optimization (HBMO) algorithm for maximizing the total supply of the Two-loop and Hanoi water distribution networks (WDNs) under a failure condition. The proposed method is much faster and simpler to use than the NFA method. Consequently, obtained results confirm the higher accuracy of the proposed method to conditions of WDNs under local pipe breakage. In addition, results make one aware of the effects of each pipe breakage on consumption nodes and in the entire network under two scenarios for maximizing total supply in the network.

Assessment of Lisbon drinking water distribution network biofilm colonization and associated hazards

2008 ◽  
Vol 8 (4) ◽  
pp. 421-426
Author(s):  
J. Menaia ◽  
M. Benoliel ◽  
A. Lopes ◽  
C. Neto ◽  
E. Ferreira ◽  
...  
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Water Distribution Network ◽  
Storage Tanks ◽  
Water Pipe ◽  
Cultural Methods ◽  
Drinking Water Distribution ◽  
And Storage

Concerns arise from the possible occurrence of pathogens in drinking water pipe biofilms and storage tank sediments. In these studies, biofilm samples from pipes and sediments from storage tanks of the Lisbon drinking water distribution system were analyzed. Protein determinations and heterotrophic counts on pipe biofilm samples were used to assess the Lisbon network sessile colonization intensity and distribution. Indicator and pathogenic microorganisms were analyzed in pipe biofilm samples, as well as in storage tanks biofilm and sediments, by using cultural methods and PCR, to assess risks. Results have shown that the Lisbon network sessile colonization is relatively weak in intensity. In addition, no meaningful hazards were apparent for both the network biofilm and the storage tanks biofilm and sediments.

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