Estimating aquifer transmissivity using Dar-Zarrouk parameters to delineate groundwater potential zones in Alluri Seetharama Raju District, Andhra Pradesh, India

Abstract

This study aimed to explore groundwater potential zones in the EGMB of Alluri Seetharama Raju district, Andhra Pradesh, India, for drinking and agriculture purposes. To achieve this goal, 72 Vertical Electrical Soundings (VES) were conducted using the Schlumberger electrode configuration. The resistivity sounding data were analyzed to determine the aquifer thickness, basement depth, Dar-Zarrouk parameters, and aquifer transmissivity. Spatial distribution maps were generated for these parameters to understand the subsurface formation. The analysis revealed a linear groundwater potential zone (8.46 km 2 ) in the eastern part of the study area, extending in the NNE-SSW direction for 9.6 km. Six VES locations (P24, P27, P29, P30, P33, and P38) in this zone exhibit good potential (>30 m aquifer thickness), while the three VES locations (OP19, P5, and P46) in the central region are recommended for drilling bore wells. Additionally, moderate aquifer thickness (20-30 m) are identified in other VES locations (OP14, OP20, P4, P10, P12, P13, P15, P17, P18, P31, P46, and P50) along streams in the western and central part of the area, which can yield reasonable quantities of water. This information is useful for groundwater exploration and watershed management to meet the demands of tribal population in the study area.

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“…This can be explained by high lineament density in the study area. Lineaments, such as faults and joints, play a crucial in groundwater accumulation and movement (Raju et al 2023). The AHP and MIF results indicated that the central and northern parts have well to very good GWP.…”

“…Geology is the most influential factor influencing the occurrence, availability, and distribution of groundwater (Kumar et al 2017). Groundwater occurrence, distribution, and movement vary with location mainly due to rock formation, rock fracturing and the degree of weathering (Raju et al 2023). The study area featured a diverse range of geological formations, comprising around twelve different rock types.…”

“…Groundwater is a crucial source of water supply, especially in regions with erratic rainfalls (Kazerani et al 2023). In some regions, groundwater exploitation has increased to meet the demand due to surface water quality deterioration and supply (Raju et al 2023). Accessing groundwater resources has became more important as water demand has increased, particularly in dry regions (Emami and Shahamat, 2022).…”