Evaluation of Potential and the Amounts of Groundwater Recharge in the Garmsar Plain Aquifer Using Water Table Fluctuations and Piscopo Methods

Document Type : Original Article

Authors

• Elham Fijani ¹
• Sahar Meysami ¹
• Morteza Mozafari ²

¹ School of Geology, College of Science, University of Tehran, Tehran, Iran

² School of Geology, College of Science, University of Tehran

10.22067/jfcei.2022.77818.1169

Abstract

Groundwater resources are one of the main sources of freshwater supply, especially in arid and semi-arid areas. Estimating the amount of recharge is one of the most important problems in the sustainable management of groundwater resources and assessing the abstraction potential of the aquifer. In this research, first, the recharge potential in the Garmsar plain aquifer was obtained using six factors including slope, land use, geomorphology, lithology, drainage density, and line density, and then, to validate the resulting map, recharge was evaluated using the water table fluctuations and Piscopo methods. The results from the recharge potential map showed that its amount decreases from the alluvial fan in the north of the area to the margins. The amount of annual recharge of the aquifer varies from 1.95 mm in the south to 478 mm in the north of the area by the water level fluctuations method. The maps obtained from both methods showed the same trend in the area; the north of the aquifer area, which is located at the top of the Garmsar alluvial fan, has the highest amount of recharge, and the values decrease towards the south and the edge of the aquifer. The results obtained from the evaluation of the groundwater recharge value confirmed the potential map well.

Keywords

• Groundwater recharge
• water table fluctuations
• Garmsar aquifer
• recharge potential

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