Evaluating the effectiveness of flood control structures in Golab darreh-Darband watershed, Tehran

Subject Areas : watershed

Baharak  Motamedvaziri ¹ (Department of Nature Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran)
Hadi  Kiadaliri ² (Department of Environment and Forest Sciences, Faculty of Natural Resources and Environment, Islamic Azad University, Science and Research Branch, Tehran, Iran)
Sasan  Arefi ³ (Department of Nature Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran)

Received: 2022-05-30 Accepted : 2022-09-18 Published : 2022-09-22

Keywords: Watershed Management practices, Rainstorm, Golabdarreh–Darband watershed,

Abstract :

Golabdarreh- Darband watershed is one of the watersheds of north of Tehran which pay special attention to management of these basins due to flooding of these basins to Tehran city and its potential financial and life threat. In this research, HEC-HMS software has been used to determine the response of this watershed to floods before and after the watershed operation. Taking into account the lack of ability to determine the rainstorm corresponding to the time period before and after the flood control operations carried out in the watershed in order to investigate the studies of floods caused by single rainstorm, the investigation and statistical analysis of the rainfall and flood data related to the rain gauges and hydrometers stations located in Gulab Dareh-Darband watershed were closed and simulation of the watershed was done in the HEC-HMS software environment, so that after simulating the watershed, the flood caused by the watershed can be measured to the maximum 24-hour rainfall for the return period of 10, 25 and 100. The results of the simultaneous assessment of rainfall and flood in the studied watershed, before and after the implementation of the watershed projects, showed that the watershed operations had a direct effect on reducing floods, increasing flood infiltration and controlling it, and this effect on floods with a high return periods, there have been more so that the flood peak discharge and flood volume in the 10, 25 and 100 year return periods, after the implementation of the watershed projects, shows a decrease of 10, 27.4 and 40 percent, respectively.