Vol. 5 No. 2 (2021)
Articles

Zoning of Flood Hazards and Their Impacts on the Dispersity of Social and Economic Areas (Case Study: Mazleqan basin, Saveh city, Markazi province, Iran)

Published 2021-11-10

Abstract

Floods cause numerous damages each year and hydrologists have attached importance to it. Physiography, geomorphology and human factors can accelerate this process in the basins. The present study examined the flood zones at the Mazleqan Basin using the SCS method. The hydrograph dimensions of the basin were obtained from the 24-hour precipitation levels, time of concentration, hydrologic soil groups, curve number, permeation, and excess precipitation, time to the peak and peak discharge for a 25-year period of time. To provide a flood zoning map, the overlap method of various basin maps, including hydrologic soil groups, slope, CN, land use, 24-hour precipitation with a 25-year return period, excess precipitation with a 25-year return period and peak discharge with a 25-year return period were used. Also, a general model of different layers that was proportional to the weight of each layer was developed. In this research, the flood hazard area was considered to be 100 meters. The findings revealed that flood hazards were not taken into account in the dispersity, distribution and establishment of social and economic areas surrounding the basin. Accordingly, the number of 25 villages with a population of 1799 people, a city with a population of 4334 people, 15 springs, 15 wells, 79 aqueducts with a length of 29 km, 5182 hectares of agricultural land, 2037 hectares of gardens and 9 factories within a 100 meter-radius of the river were identified.