2.3 Data collection
Precipitation and discharge data from meteorological stations, and groundwater information, from 61 piezometer wells in the three aquifers within the Eskandari watershed (Chehel Khaneh, Damaneh-Daran, and Buin Miandasht) were collected over a 16-year timeframe (from 2004 to 2019) for this study. Furthermore, data regarding the Cheshmeh-Langan tunnel was obtained from the Vahdat Abad meteorological station from 2005 (the start of its operation) to 2019. All of the required data were obtained from Iran's Water Resources Management Company (IWRMC) (2019).