Such a large network – accounting for more than 80% of the value of this national legacy, i.e., the installations of a service providing the population with drinking water – is of major importance to the public bodies managing this resource.
How should the frequency of equipment renewal be assessed and these works be prioritized while containing costs? To aid the managers of this network, Cemagref scientists in Bordeaux have developed software that can forecast the network’s aging, thus identifying the pipes that are at the highest risk.
With time, the hydraulic performance and the quality of the water transported by the pipes in place decrease and water losses and damage to the infrastructure increase. The latter phenomena, which can cause spectacular damage (floods, water cuts, disturbances in road traffic), are generally recorded by the agencies responsible for their maintenance within the local government bodies.
Corrosion, an increase in water pressure in the network, destabilization of the underlying land by roadworks, the conditions at installation, and age can all cause damage. While the duration and lifespan of the pipes can be long: some, put in place more than 150 years ago, continue to function properly; certain sections, however, deteriorate more quickly and should be replaced earlier.
- Modeling the risk of damage...
To assist the managers of this network in evaluating how often various sections of the network need to be replaced, as well as in organizing and planning the works in sync with roadworks, for example, Cemagref’s Netwater team scientists are developing tools that can supervise network aging, from data collection to the decision to renew pipes. Software called Casses, on the market since October 2007, was developed after research lasting more than 10 years. The approach chosen estimates, for a future period, the number of breakages that each section of piping will undergo. It is based on data available in the archives that describes the pipes, their environment, and the past history of damage. Initiated in 1994, this work was pursued within a CARE-W 1 European research program, from 1999 to 2002, during which comparison with field data made it possible to assess the relevance of this approach and refine it. Since then, the Casses software has been successfully applied in France and abroad, notably in the cities of Oslo and Las Vegas. Designed to adapt to the diversity of management practices, it has been shown to perform well in predicting the number of future breakages and in identifying the pipes that are at the greatest risk.
- and evaluating the extent of damage…
A second software program, baptized Criticité, also developed and marketed by Cemagref, was designed to quantify the distruptions in water distribution when a section is damaged. Distribution is not disrupted in the same proportions if the damage occurs at the end of the network that serves a few users or in a water main coming out of a reservoir. For a given event, the interaction between its probability, calculated by Casses, and its impact, provided by Criticité, provides information on the extent of the risk related to this event. Studies are ongoing so the users that are particularly deprived of water as well as those who have no water can be taken into account, as the current version of the software forecasts.
- And the small towns ?
Mutualizing the data of small towns so that they can take advantage of statistical modeling: such is the objective of the SIROCO program. This software was developed by Cemagref and G2C Environnement R&D. Individually, these small towns do not have sufficient data for an optimal use of the Casses forecasting models. In addition to Casses and Criticité, SIROCO uses a geographical information system, the Cart@jour GIS to mutualize data. This is an integrated system that allows the user to prioritize the sections of the network that are candidates for renewal.
Marie Signoret | alfa
Ultra-precise chip-scale sensor detects unprecedentedly small changes at the nanoscale
18.01.2017 | The Hebrew University of Jerusalem
Data analysis optimizes cyber-physical systems in telecommunications and building automation
18.01.2017 | Fraunhofer-Institut für Algorithmen und Wissenschaftliches Rechnen SCAI
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
10.01.2017 | Event News
09.01.2017 | Event News
05.01.2017 | Event News
18.01.2017 | Power and Electrical Engineering
18.01.2017 | Materials Sciences
18.01.2017 | Life Sciences