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Determination of Urban Runoff Using ILLUDAS and GIS



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Texas A M University Department of Civil Engineering Instructor Dr Francisco Olivera CVEN689 Applications of GIS to Civil Engineering Determination of Urban Runoff Using ILLUDAS and GIS Tae Jin Kim 03 May 2004 Abstract The flowing water function of surface area has been reduced rapidly by lasting progress of urbanization and industrialization As the sewer pipes of urban area are established or extended surface area and water route in urban river are mostly paved or connected to sewage box Also the peak discharge in urban area is increased due to the runoff enlargement and the watershed lag time reduction Moreover by the large scale residential land development of lower reaches section of a river in urban area the hydrologic phenomenons are changed and the flood damages in urban area are occurred frequently In particular because the damage cost and damage scale is increased relatively due to development rate and population concentration it is required the accurate and rapid runoff analysis in urban area Accordingly in this study we use Geographic Information System GIS and Illinois Urban Drainage Area Simulator ILLUDAS to get the urban runoff The GIS can be used to select the available data according to need The ILLUDAS can estimate the urban runoff more accurate than the existing methods INTRODUCTION The flowing water function of surface area has been reduced rapidly by lasting progress of urbanization and industrialization As the sewer pipes of urban area are established or extended surface area and water route in urban river are mostly paved or connected to sewage box Also the peak discharge in urban area is increased due to the runoff enlargement and the watershed lag time reduction Moreover by the large scale residential land development of lower reaches section of a river in urban area the hydrologic phenomenons are changed and the flood damages in urban area are occurred frequently In particular because the damage cost and damage scale is increased relatively



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