Study On The Water-circulating System Of Mountainous Eco-residential Sub-district

During the course of the design of the circulating system of eco-residential sub-district, it is necessary to abide by the idea of sustainable development and systematic theory., while mountainous eco-residential sub-district is a type of it. Due to the characteristic of great difference in the landform height, the diversity of the physiognomy and the discommodiousness of water supplying and discharging etc., it is necessary to introduce the idea of "circulation", as well as exert merits and abstain demerits, so as to build a water circulating system of economic and water-saving.On the premise of the economics of the system, the emphasizes of the research into water circulating system of mountainous eco-residential sub-district is the collection, treatment and reusing of the reclaimed water and rainwater. The main contents of the thesis consist of the erectness of the equation of mountainous eco-residential sub-district, the optimal choice of the united system of the reclaimed water and rainwater, the optimal design of the united system of the reclaimed water and rainwater etc. Finally , the thesis explains the design and calculation of the water circulating system of mountainous eco-residential sub-district by an example.In mountainous eco-residential sub-district, many accordant junction conflux areas form naturally, because of the great difference of the landform height. Besides, the medium of accordant junction conflux is diversified. All these would bring about big errors in the calculation of the runoff if the calculating method of plain and upland is adopted. The thesis analyzes various methods of abroad in calculating runoff and makes sure to erect the ground runoff equation of mountainous eco-residential sub-district, using the method of SCS. Following, the roof runoff equation of mountainous eco-residential sub-district is erected, in consideration of the characteristic of roof material, the rainfall characteristic of different seasons.The choice of the united treatment technology of the reclaimed water and rainwater project, which is connected with the economics of the whole water circulating system, is a key problem and also the emphases of the thesis. The optimal choice of the united treatment technology of the reclaimed water and rainwater project, which is related to the integrated measurement of economical index, technological and administrative index, is a system engineering and belong to multi-object decision-making. Base on the analysis of the merits and demerits of the optimal choice of projects , the thesis adoptsthe combination method of the analytic hierarchy process and matter-element analysis. And the capillary percolation system is assured as the optimal technology of the united system of the reclaimed water and rainwater.The optimal design of the united system of the reclaimed water and rainwater, in the first stage, is to distinguish the direction of the development, control and adjustment by system analysis. Then to optimize the design of the reclaimed water system, on the base of system analysis, I erect the annual cost none-linear design of the united system of the reclaimed water and rainwater. The thesis analyzes the united system of the reclaimed water and rainwater by the use of the principle of integration, structure, relevance and motion; and also taking the water quality and quantity as limiting condition, the annual cost none-linear design of the united system of the reclaimed water and rainwater is erected.At last, the thesis takes an eco-residential sub-district in Chongqing as example, and explain the design and calculation of water circulating system of mountainous eco-residential sub-district, through the calculation of the reclaimed water and runoff, the dimensional calculation of the soil capillary percolation system, the annual cost none-linear design of the united system of the reclaimed water and rainwater, as well as the use of software Logo.