Hydrological Impacts of Chashm Dam on the Downstream of Talar River Watershed, Iran

Gholami V¹, Khaleghi MR²* and Zabardast Rostami HA³

¹Assistant Professor, Department of Range and Watershed Management and Department of Water Engineering and Environment, The University of Guilan, Faculty of Natural Resources, Sowmeh Sara, Iran
²Torbat-e-Jam Branch, Islamic Azad University, Torbat-e-Jam, Iran
³Mazandaran Regional Water Company, Iran

*Corresponding Author: Khaleghi MR, Torbat-e-Jam Branch, Islamic Azad University, Torbat-e-Jam, Iran.

Received: September 09, 2017; Published: September 27, 2017

Citation: Khaleghi MR., et al. “Hydrological Impacts of Chashm Dam on the Downstream of Talar River Watershed, Iran”. Acta Scientific Agriculture 2.1 (2018).

Abstract

  Dam construction causes hydrological and environmental problems on the dam’s downstream. Chashm dam will construct to provide the drinking water of Semnan province on the Talar river. The present study evaluates the hydrological and environmental effects of Chashm dam on the Talar watershed downstream. At first, some data were provided using topographic maps and GIS capabilities such as: watershed physical model, the effect the area of the rain gauge stations, the percentage of impermeable areas. Then, a rainfall-runoff model was presented to simulate the watershed hydrologic behavior using SCS method for simulating flow hydrograph, Initial/Constant method for estimating runoff values and Recession method for estimating base flow. Then, the model was optimized and validated. After validation, Chashm dam was simulated in the validated model to simulate the hydrologic response of dam multi-purpose reservoir and flow routing in the multi-purpose reservoir. Also, a comparison was done between the water needs of the downstream ecosystem and Chashm dam partnership in the water provision of Semnan province and also the comparison was done between input and output flows of the dam. The results showed that the volume of annual input water cannot provide Semnan water demand and downstream ecosystem water needs simultaneously.

Keywords:Hydrologic Effects; Dam Multi-Purpose Reservoir; HEC-HMS Model; Water Demand

Copyright: © 2018 Khaleghi MR., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.