Estimating the volume of flash flooding in the Wadi Qasab basin in Khanaqin district using the Snyder model

Abstract

The Wadi Qasab basin is one of the dry river basins, which originates from Iranian lands and flows into the Al-Wand River in Khanaqin district, this basin is characterized by seasonal surface water runoff, coinciding with the winter rainfall season, and the rains in the study area are characterized by fluctuations in the amounts of their fall, and irregularity in their times, as the rains fall intensively and during periods of time. For the purpose of knowing the amount and volume of surface runoff, and whether it is possible to benefit from it in order to serve the study area, the Snyder model was relied upon using (15) variables, and it was found that the volume of torrent flow for the total Wadi Qasab basin (1. 2 million / m3 / s), while the secondary basins (northern secondary, southern secondary and western secondary basins) recorded values ranging from (0.3 - 0.9 million / m3 / s), the volume of torrent flow is very large compared to the area of the basins, which leads to the possibility of flood danger, as these values pose high risks to human stability, especially in the main valley streams and their estuaries, because of the demolition, erosion and transfer of sediments and rock fragments.