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Identifying and ranking factors involved in creating urban water Inundation (Case study: Karaj City)

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Research Paper 01/07/2014
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Identifying and ranking factors involved in creating urban water Inundation (Case study: Karaj City)

Ali Shahbazi, Keyvan Avaz Abadian, Hojjatollah Samadi Arghini, Arash Malekian
J. Bio. Env. Sci.5( 1), 150-156, July 2014.
Certificate: JBES 2014 [Generate Certificate]
Key: Manning roughnessPermeable zonesSensitivity analysisSWMM modelUrban runoff

Abstract

Expansion of housing and municipal infrastructures because of the ever increasing population on one hand and the conversion of agricultural, pasture and forest lands to urban areas on the other hand have led to many natural problems like agitated ecosystems and unbalanced hydrological status in different areas. Sensitivity analysis serves as a way of identifying influential factors in shaping final model’s output. This study strives for the identification of influential factors in water Inundation using SWMM model. To this end, of the 9 primary factors of the model, 15 and 30 percent reduction or addition were made and the resulting peak flow was examined in each case. The results showed that the most sensitive parameters to low orders of sensitivity include the percentage of impermeable area, channel roughness coefficient, Manning’s roughness coefficient of impermeable areas, width of the equivalent rectangle, slope, curve number (CN), impermeable areas storage, Manning roughness coefficient in permeable zones. Since the use of impermeable surfaces in urban areas is inevitable, new methods based on the criteria of sustainable development, long-term planning and existing facilities could be devised in order to at least reduce the damage caused by the floods. By restoration of natural cycle of water remarkable leaps could be taken to conserve current water resources and maintaining current development and future progress.

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