Abstract
Flood computer modeling is one of the recent practices which is used for the prediction of the flood occurrence at different intervals of time. A study was conducted on Narai Drain Hayatabad, Peshawar, to produce flood plain maps by integrating Arc-GIS with the Hydraulic Modeling software HEC-RAS. The area in the vicinity of Narai Drain was inundated due to the catastrophic flood occurred in the year 2010, which caused huge damage to public property, livestock, communication, and infrastructure. In this study, the Narai Drain watershed was classified into three watersheds, namely Narai Drain Upper, Lower, and Regi Drain. GIS technology was used to delineate the watersheds while the discharges were computed using the WinTR-20 mode. Expected rainfall depths were obtained by using Log-Pearson type III Distribution for different return periods (i.e., 2, 5, 10, 25, 50, 100, 200). The area inundated by the flood was estimated by using HEC-RAS. These results were then incorporated in GIS to prepare flood inundation maps. Maximum inundation occurred in the sensitive area of Narai Drain Lower for a 10-year return period. The integrated modeling approach used in this study was found very useful to delineate the area vulnerable to flood with a good estimation of inundation depths at various discharge values. The results show that in the upper reach of the Narai Drain, most of the area lying near the flood zone was safe for a 100-year return period, while the lower reach was vulnerable even for a return period of 10 years.
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Communicated by Dr. Mohammad Valipour.
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Salman, A., Hassan, S.S., Khan, G.D. et al. HEC-RAS and GIS-based flood plain mapping: A case study of Narai Drain Peshawar. Acta Geophys. 69, 1383–1393 (2021). https://doi.org/10.1007/s11600-021-00615-4
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DOI: https://doi.org/10.1007/s11600-021-00615-4