USING INDIGAU ASSET MANAGEMANT TOOL FOR PRIORITIZING REHABILITATION PROGRAMS OF SEWAGE NETWORK OF CAEN-LA-MER

An increasing concern of water and wastewater utilities in next years is retrofitting of existing networks which is called asset management. The sewage segments are subject to destructive constraints that bring about inev itably their degradation . Utilities will therefore have to ensure renewal of their networks and to support the heavy investment loads. A national French R&D program (RERAU, 1999-2004), which is mainly devoted to the description and construction of a set of criteria for prioritizing the rehabilitation of sewerage systems takes into account a wide range of possible causes of malfunction and dysfunction of a section by using information obtained from complementary sources: visual inspections of sewer segments, network monitoring and etc. A new R&D program (INDIGAU, 2007-2010) is dedicated to calibration and experiments of models that were defined within the RERAU program . An online program then was developed to ease the utilization of this methodology. In this artide these R&D programs will be described briefly and then the results of first implementation of INDIGAU on a real case will be reported . This program was applied on about 10% of network which is a real renovation in terms of sewage network asset management