Modeling of the evolution of the structural status of a storm sewer system- Application to a municipality in Quebec

Many sanitary and storm sewer networks are old and deteriorating rapidly. W ater and sanitation managers are becoming more and more aware of the negati ve impact of poorly maintained sewer networks, especially since they are as ked to comply with stricter environmental standards under already challengi ng budget constraints. The best way to improve the structural condition of a sewer network is to replace failed pipe sections. Planning replacement wo rks necessitates knowledge of the present structural state of the network a nd of the evolution of this state in the near future. Towards this goal, a predictive modelling strategy was developed for the structural state of a s ewer network. A case study in a Quebec municipality is presented to illustr ate how the modelling strategy developed can be used to simulate the evolut ion, over the next 20 years, of the length of a sewer network in poor state , and to assess the impact of different replacement strategies on the globa l state of the network.