Energy-saving and consumption reduction at the Water Treatment Plant are mainly determined by the three aspects,namely reduction of electrical power consumption,reagent consumption and chlorine consumption,which are directly of vital importance to water making cost.

In this article,according to the principle of rational water using and the model of water price designing,and by utilizing the model and calculation of agricultural water,industrial water and using water,the cost water price and bearable water price of the middle field of Heihe River are calculated and analyzed.

Mathematical models for water supply cost of hydraulic engineering;

In order to find out the actual cost of water supply enterprises and promote the formation of reasonable water price mechanism, investigation and examination were made on water supply cost in a city under administration of province.

The water supply cost and water fee standard of the surface and groundwater conjunctive use for irrigation areas have been analysed and discussed by using the actual data of projects.

Investigation and analysis of the cost of water supply at the final canal system in the gravity irrigation area of the Yellow River in Ningxia;

By analysis of the cost of water supply in the irrigated regions, the influences of different electricity prices on the cost of water supply in those regions and the current water price policy are studied.

This paper conducts an analysis and discussion of the cost of water supply and standard of water expense for combined well with canal irrigated area by using the pratical data in engineering.

Analysis on impact of water-transfer between regions on the water cost: an analogy;

The basic situation of the phase I and phase II seawater reverse osmosis desalination project is introduced in this paper,and its engineering investment and water cost is also given out.