Mathematical models of water supply pipeline deterioration

Summary

Over recent years the RF Government has been developing different projects focused on the upgrade of public utilities and improvement of the quality of living of the Russian population: capital renovation of residential properties, improvement of the yard areas as well as reconstruction of water and sanitation systems. However, despite all these good initiatives at the end of the next financial year the residents of the Russian cities increasingly pose the question about the expediency of the financial investments in this sector. The question is legitimate and is caused by the low quality of the renovation made that does not only improve the living conditions but brings new difficulties related to the necessity to eliminate mistakes made by dishonest contractors. The problem of the economic expediency of the existing model of water supply system reconstruction adopted in the Russian cities through the example of the Lipetsk Area is considered. Mathematical models of pipeline failure rates are described; performance characteristics of pipelines made of different materials and their effect on the drinking water quality in the region are analyzed. Based on the mathematical calculations the conclusion is drawn about possible efficient investments in the process of water distribution pipeline renovation while providing for the significant improvement of their qualitative characteristics.

Key words

tight financing , water distribution network renovation , mathematical model of failure rate , pipes made of ductile iron , water supply system upgrade

Optimization of the prospective plans of water supply
system development under the tight financing conditions

Summary

The transition to market relations determined a new for our country technology of the urban utility systems management. This technology can be presented in two stages. The first stage is the development of the water supply and wastewater disposal plans; the second one – is the implementation of these plans on the basis of the investment programs of the public utility sector. The investment programs are shaping the financial support of the development and upgrade of wastewater disposal systems by means of the investment component in the tariff; charges for connecting newly built capital construction projects and targeted financing from separate state and municipal programs, loans and credits. Under this approach the determinants are the investments and their limitation in stages and wastewater disposal system development periods. In connection with this new problems and challenges arise related to the efficient allocation of these investments in the construction of new and upgrade of the existing water and wastewater projects. Based on the developed models and methods of substantiating the structure and parameters of wastewater disposal systems a method of shaping and optimizing the options of wastewater disposal system development under the tight financing conditions is proposed.

Key words

reliability , ecological safety , redundant layout , seismic resistance , optimal management of water supply and wastewater disposal system development , quantitative indicators , tight financing