| The urban design rainstorm and urban rainfall runoff calculation model is the basic theory of the town rainfall drainage system design and checks, administration and planning, rainfall runoff pollution prevention and so on. In our country, because of the lack of the rainfall datum and the rainfall runoff observing datum, the sluggish calculation theory and the technique, and so on, this theory is difficult to adapt to the practice necessaries that developed in the contemporary town, and the rainfall problem in town is stressed increasingly. Resolve thanks to the fact that the rainfall problem brought is developed in the town, and have to improve to original theory. Although there is some research fruit to unite our country practice now, it still is a lot the limitations, and is many problems to hurry to wait resolving.This text directs against above-mentioned situations, according to the national conditions of our country, on the basis of the thing that forefathers study, combine the local characteristic, test inside and outside the room, write down the rainfall and surface flow and observe the materials by oneself, combine the intellectual theory of modern calculation, sampling to the urban rainfall materials, adjustment, urban torrential rain calculate mode and his parameter optimize, and urban rainfall the earth's surface is it ooze , is it flow , converge relevant theory of calculating etc. not to carry on overall analysis , theory proving and application study to produce to enter:(1) Through comparing and analyzing the materials sampling of current urban rainfall and adjusting the method, combine the actual need of development of modern city, have proposed not reproducing the conversion formula of the different sampling method, urban design storm materials statistical analysis annual oversize value sampling method, φ -(p,cs) value thinning and pluralism method and the method of P-III typedistribute parameter estimation --the improve hybrid genetic optimum curve-fittingalgorithm. Through verifying: Annual oversize value method can simplify sampling and count, reflect modern city is it is it reappear issues of torrential rain statistics law, rain of kind of range to design to drain off water objectively, and the methods used are close at present for the result. The improve hybrid genetic optimum curve-fitting algorithm is simple and easy and in common use having a good adaptability line, very accurate three parameters x, cv, cs estimate, it overcome it is traditional and right line the laws fail not solving, especially cv estimation precision, and computational process and resultreceive human factor under-affectedly , has offered very effective method for estimating accurately P-III type distribute cure parameter, and can use widely .(2) Have proved the choice basis of the urban stormy intensity calculating equation in theory. The new-type hereditary accelerate algorithm (abbreviate as NHAGA) is proposed in estimating the parameters of the single reappear issue and the unison reappear issues of urban stormy intensity equation. Tested and used by NHAGA algorithm to compare with indicating: this method is very effective method in optimizing parameters of the urban stormy intensity equation for a kind of the overall situation to use.(3) By application of drawing up the rainstorm formula of Changsha, the correct and rationality of the above-mentioned is validated, Moreover the rainstorm intensity calculation pattern of Changsha is obtained.(4) Through experiment comparison of the urban rainfall infiltrating loss, the characteristic analyses of the earth's surface and draw to produce to enter: the GAML and Phillip infiltrating equation can apply in the exact runoff yield loss calculation, Horton can apply in ordinary calculation, when calculating the town rainfall runoff conflux, nonlinearity reservoir means can be adopted if the more calculation accuracy requirement, otherwise the isochronal method can be adopted.(5) By theory analyzing and example calculation and comparison, the conclu...
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