Development of water supply and sewerage systems based on pipeline and road transport of water and sewage liquor

Abstract

Currently, the established methodology for managing the development of water supply and sewerage systems consists in the multistage development of schemes, construction and commissioning of new and reconstructed facilities. Capital investments are made discretely and at different times, and operating costs increase as new water consumption and wastewater disposal facilities are commissioned. In this regard, there is a variance in the development of systems. The number of development options depends on the number of construction stages and the options used for transporting water and sewage liquor. The main task in this case is to determine such a structure of the network and flows of water supply and sewerage systems, which would ensure minimum life cycle costs for its multistage construction, its operation, and the prevention of emergencies. To solve this problem, the work proposes a method based on a multi-step process of optimizing the parameters of reconstructed and new sections of the network and structures with a preliminary building of a graph of possible transitions of the water supply and sewerage system from one state to another. The optimization methodology is based on the use of methods for determining the minimum cost maximum flow and full-system minimization of pipeline and road water supply and sewerage systems at each stage of generating development options. This methodology allows taking into account the deterministic, probabilistic nature and interval uncertainty of information about the behavior of the sewerage system in the future and embodies the principle of “make a decision with minimal lead time”.