The theory and practice of a computing process on urban rainfall runoff,named modifiedRoad Research Laboratory(RRL)method was introduced. By this way the real rainfall was simulatedand observed that the forecasting results were close to actual measuring results,which proved thiscomputing method will be accurate enough and also provided it will be an effective way for urban rainfallrunoff forecasting.
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.
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.
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.
The area of impermeable ground increases rapidly with the development of urbanization,and the amount of runoff increase accordingly. As the rainfall washes the pollutants in the air and on the ground,its threat of pollution can not be ignored anymore.
Plasma treatment decreases the potential toxicity of snowmelt and rainfall runoff containing ammonium and chloride ions, oil products, phenols, and carboxylic acids (as recalculated for CH3COOH).
Different procedures are proposed to improve the calculation method for the maximum specific rate of rainfall runoff from small river basins, with the allowance made for the statistics of spatial distributions of the initial variables and parameters.
Rainfall runoff that was channeled to the periphery of the rocks caused Ψsoil near the fern roots to rise above-1.5 MPa even after light rainfalls, and it remained above-1.5 MPa longer after rainfall than in non-rocky sites.
This paper discusses the rise of runoff quantity, the decrease of its drain time and their consequences because of urban development,and the benefit of recharge of urban runoff to groundwater .The pollution of urban runoff and some factors which affect the quality of runoff are analyzed .The results show that the pollution of first flush is very serious ,and it is mainly affected by roof materials ,temperature ,the volume and intensity of rainfall etc. According to the results of research on rainfall qualit...
Quantity of storm water runoff in urban area increases along with the expansion of impermeable land surface in construction. Storm water might be one of valuable water resources. Runoff should be used to conserve groundwater and to improve ecological environment at first, then be discharged rationally and safely into water bodies. In this paper, varieties of rainwater drainage systems, infiltration facilities and their suitability, site selection, clog and pollution problems are described.
The theory and practice of a computing process on urban rainfall runoff,named modifiedRoad Research Laboratory(RRL)method was introduced.By this way the real rainfall was simulatedand observed that the forecasting results were close to actual measuring results,which proved thiscomputing method will be accurate enough and also provided it will be an effective way for urban rainfallrunoff forecasting.