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HEC-RAS and GIS based food plain mapping: A case study of Narai Drain Peshawar

Salman Awais, Hassan Sher Shah, Khan Gul Daraz, Goheer Muhammad Arif, Khan Aftab Ahmad, Sheraz Khurram

Acta Geophysica

2021

Vol. 69, no. 4

1383--1393

Flood computer modeling is one of the recent practices which is used for the prediction of the food occurrence at diferent intervals of time. A study was conducted on Narai Drain Hayatabad, Peshawar, to produce food 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 food occurred in the year 2010, which caused huge damage to public property, livestock, communication, and infrastructure. In this study, the Narai Drain watershed was classifed 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 diferent return periods (i.e., 2, 5, 10, 25, 50, 100, 200). The area inundated by the food was estimated by using HEC-RAS. These results were then incorporated in GIS to prepare food 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 food 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 food zone was safe for a 100-year return period, while the lower reach was vulnerable even for a return period of 10 years.