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People live in the plain beside rivers for it's convenience anciently. However, as time goesby the civilizasion which change from the agricultural style to the industrial and commercial style progressed and germinated high-dense cities.Because of it,the cataract peak is added and the time of concent-ration is shortened therefor, the effect of the drainage in a megalopolisreduced,the probabilities of inundation in block-street increased and it makesloss and inconvenient. For example, the Taipei city is often suffered by inun-dation.The purpose of this paper is to build a block-street network inundationmodel(BSNI-model).During the cataract,we can view the phenomenon that the rainis storaged on streets and becomes overflow as drainage and use the governmentequation in open channel to solve the Mac Cormack scheme and get the dischargeand depth of every section on the street to approximate th real situation on the streets and blocks while the cataractis came.We use the discharge continue, the equation of energy head and accommodate the Character Mmethod to get thesolution in the junctions. In this paper, we design several different cases totest the simulated ability of the BSNI-model. Compare and discuss the operationresult and we can see that this model is good in simulation but it should be tested by the real case advancedly to explore the practicability of this model.
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