Improvement Studies About Drain Analysis Algorithm

20 years of reform and opening up, China has sped up the process of urbanization, while urban development and the rapid expansion have also brought a lot of "urban disease". For example, the city with torrential rains has attracted more and more attention. Ofen a normal rain can lead to a large area of flooding and then traffic congestion .The normal production and life order in the city are seriously affected.Rainfall is not the root cause of urban flooding. We should not overlook the increasing impermeable pavements and buildings which narrowing the stormwater infiltration area causing increasing stormwater runoff. Because of runoff increased, rainwater may carry more contamination , which can block storm drainage.Drain Analysis can do something in this area.On the basis of studying ArcObjects methods and DEM, this paper improves the Drain Analysis Algorithm in several aspects to make it more suitable for analyzing the relationship between the hardened face of urban and flood disasters.Firstly, we successfully put Drain Analysis Programme into ArcObjects procedures. ArcObjects fullly play the advantages of a Drain Analysis of the 3D display, color and transparence installed, thereby enhancing the efficiency and function of Drain Analysis process.Secondly, after depth study on Drain Analysis Algorithm, we found a creative way to deal with depression finding and water overflowing programming with examples to verify the correctness .Thirdly, we resolved the key issues of dynamic simulation, and successfully introduced the permeability coefficient to Drain Analysis Programme..This paper involved many texts, objects, and variables.Through this exploration, this paper contributes to the planning, design and flood prevention departments with tools to minimize urban flood disaster.