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Comparison of hydrodynamic coefficients of Dalon- Meydavood plain by grain size analysis, geophysics and pumping test methods
Miss Sooror Mazraeasl, Mr Farzad Akbari, Ms Elahe Iraniasl, Miss Leila Hosseini Shafei,
Volume 18, Issue 1 (5-2024)
Abstract
Groundwater is one of the main sources of water supply for agriculture, drinking and industry in Iran, especially in areas with arid and semi-arid climates. Therefore, due to the high importance of groundwater resources, it is necessary to know the hydrodynamic parameters in order to determine the natural flow of water and manage the optimal utilization of groundwater resources. Considering the role of the Daloon-Meydavood aquifer in providing part of the water needed in the study area, especially for agricultural purposes, the hydrodynamic parameters of this aquifer were estimated using the methods of grain size analysis, geophysics and pumping test. The parameters were calculated by all three methods and validated using the flow rate of the exploitation wells. In all three methods, the hydrodynamic parameters (Hydraulic conductivity, Specific yeild, transmissivity coefficient) are the highest in the north and northeast and the lowest in the south and northwest. The results showed that 2 methods including  grain size analysisand pumping test had the most similarity with the discharge map of the exploitationwells.
 

The Necessity of Pumping Tests and Exploratory Well Drilling in Groundwater Baseline Studies: Challenges and Gaps in Iran
Kamal Ganjalipour, Majid Naeimi, Effat Zamani,
Volume 19, Issue 2 (10-2025)
Abstract
Exploratory studies and pumping tests are considered fundamental tools for understanding the hydrogeological behavior of aquifers. They play  a critical role in water resources modeling, planning, and governing water resources. This article aims to analyze the role of these studies within the water governance framework in Iran by examining the institutional, technical, and legal challenges in comparison with developed countries. The findings indicate that weak legal requirements, the absence of an integrated data acquisition system, limited equipment, and a shortage of exploratory wells have led to reduced accuracy in baseline studies, weakened numerical models, and unstable decision-making. Additionally, the paper reviews the historical development of exploratory drilling and pumping tests, along with their tools and objectives, emphasizing the role of exploratory wells in developing conceptual models and monitoring aquifer dynamics under declining water table conditions. In conclusion, the article highlights the need to revise policymaking, strengthen institutional structures, and mandate the implementation of precise tests to achieve evidence-based water governance.

Estimation of transmissivity and hydraulic conductivity of the hashtgerd plain aquifer using step-drawdown test method via Aquifer Win 32 software
Younes Mousavi, Mohammad Nakhaei, Gholamhossein Karami,
Volume 19, Issue 4 (12-2025)
Abstract

Planning the management and optimized consumption of groundwater resources is a critical infrastructural necessity, as these resources supply a significant portion of the country's drinking water. A key component of this planning is accurately calculating the water balance, which requires determining the aquifer's hydrodynamic parameters, including transmissivity (T) and hydraulic conductivity (K). This study calculated these parameters using step-drawdown pumping test data from a single-well system across various locations in the 411-square-kilometer Hashtgerd Plain aquifer (an unconfined aquifer) with AquiferWin32 software. The results indicate that transmissivity is distributed unevenly across the plain. The lowest transmissivity values were observed in the southern (Kourosh Town) and southwestern (Najmabad) sectors, while the highest values were associated with the Kordan alluvial fan and its downstream lands. Based on these findings, maximum transmissivity was estimated at 3,682 square meters per day, with an average of 440 square meters per day. Hydraulic conductivity was determined by integrating saturated thickness data from geoelectrical studies with the previously calculated transmissivity values. The final results showed that hydraulic conductivity ranges from a minimum of 0.2 meters per day in the southern regions to a maximum of 9.7 meters per day in the central aquifer.


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