TitleNS35A-0379 - Delineations of Groundwater Resource at Various Locations of Chiniot District, Pakistan by Using an Integrated GIS and Resistivity Survey Method
Session Start2022-12-14 14:45:00 CST
Session End2022-12-14 18:15:00 CST
LocationMcCormick Place, Poster Hall, Hall - A
AuthorUmar
Presentation TypeIn Person Poster
AbstractGroundwater is a precious resource to irrigate the crops in developing countries. This research was conducted in Chiniot District of Pakistan for assessing the groundwater strata using an integrated GIS and resistivity survey method. For this purpose, vertical electrical sounding (VES) resistivity data was obtained using an ABEM Terrameter SAS 4000 with a Schlumberger electrode configuration in which half current electrode spacing (AB/2) ranges from 2 to 180 m and half potential electrode spacing (MN/2) ranges from 0.5 to 20 m were used. A computer model �IX1D v2� was used to determine soil layer thicknesses and resistivities for each VES point and then a Rockworks model (Rockware, Inc.) was also used to develop a conceptual 3-D lithological logs model of research area based on determined soil layers thicknesses values. Geo hydraulic parameters (hydraulic conductivity and transmissivity) and Dar Zarrouk parameters (transverse unit resistance and longitudinal unit conductance) were determined based on the modeling results. ArcGIS Pro was used for mapping the soil aquifer layers� thicknesses and resistivities to specify the soil aquifer layers lithology and groundwater quality zones as well as for mapping of geo hydraulic parameters to estimate well yield and water bearing capacities of aquifer layers and Dar Zarrouk parameters to estimate groundwater potential zones with respect to VES point regions. Based on aquifer layers resistivities, hydraulic conductivities, transmissivities, transverse unit resistance and longitudinal unit conductance, eight VES points were considered marginal quality of groundwater zone having intermediate well yield of �30 to 60 liter/sec�, medium water bearing capacity and medium potential aquifer through fine sand and clay formation while fourteen VES points were considered fresh quality of groundwater zone having high well yield �>60 liter/sec�, high water bearing capacity and high potential aquifer through coarse sand and gravel formation. Four VES points were considered saline quality of groundwater zone having low well yield �6 to 30 liter/sec�, low water bearing capacity and low potential aquifer through clay formation.