Management and Disposal of Urban Runoff Using Geographic Information System and River Tools Techniques (Case Study: District 1 of Ahwaz City)

Ahawzas one of the metropolises of Iran in classified among lowland plains with low slope in terms of topography.In this city, unsystematic construction andimmediate rainfalls and showers are the mainsources of flooded street. The present study has a descriptive-analytical approach and is based oncausality method. using geographic information system software (GIS) and River tools techniques, this study seeks to identify and manage of surface waters and urban floods inDistrict 1 of Ahwaz during rainfalls and then the maps of slope, their direction and areaswith flooding potentials are prepared.Findings/ given the low slope of the area, the gravity drainage and pumping of water to Karoon River is impossible due tohighcosts. However, using GIS analysis, the natural routes are determined for water drainage andfinally, the map of proposed surface water disposal system in the study area is presented.Conclusion and Suggestion: In District 1 of Ahwaz, thetree orhierarchical surface water collection network has been predicted based onurbanstreets and alleys. The collected wateris directed to the channels and then transferred toKaroon River.