Morphological Management of the Katoeeh River bed In Darab City Territory

When flooding occurs overland flow tends to run on a complex terrain with many flow paths in close connection with the collection system. It is in a physical sense difficult to separate these two flow systems. Usually, a one way flow connection is applied, allowing water to enter the collection system but overflow from the drainage system is not routed on the surface (Nielsen et al., 2008, 2). Management of water in urban areas involves control of the waste-water discharges and the modified natural drainage network in which the built-up area is located. Fast-growing cities with increasing populations have many problems with runoff water management during storms. In fact, urbanization aggravates flooding by restricting flood-water flow, covering large parts of the ground with houses, roads and pavement, obstructing channels and building drains to ensure that water will flow into rivers faster than it would under natural conditions (Harris and Rantz, 1964, Konrad and Booth, 2002 and Konrad and Booth, 2005). The risk of flooding is defined as a function of both the probability of a flood happening and its impact. In urban areas, this impact may be very high because the areas affected are densely populated and contain vital infrastructure. Ongoing development in flood-prone areas increases this risk. Urban flood hazard maps are useful tools for planning the future direction of city growth, and they usually help to recognize those areas with discharge infrastructure needs (Büchele et al., 2006). The Purpose of this study is investigation of geomorphological and civil parameters that effect on overflow Katoeeh River in Darab city Territory.