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Methodology  Exploratory Well Drilling & Aquifer Parameter Characterization
Training of State Groundwater scientists by CGWB
Source: CGWB, http://cgwb.gov.in/cr/images/PTDA%20FIELD.jpg
Groundwater exploration forms the background of scientific evaluation of the water bearing properties of various rock formations. Under this programme, 120 boreholes are drilled at selected sites in the pilot project areas, using rotary as well as DTH drilling rig machines. These sites are selected based on the compilation of existing data and identification of data gaps, as well as on hydrogeological and geophysical studies.
Drilled boreholes are geophysically logged to accurately delineate the aquifers and aquitards.
Aquifer performance tests required for the characterization of each aquifer unit, inter-aquifer hydraulic relation within the multi-aquifer system and corroboration with existing information are carried out.
Aquifer characterization is the overall output of groundwater exploration. It includes studying the subsurface lithologic variations and water bearing properties and map the three-dimensional disposition of different aquifer systems up to the desired depth, spatial & vertical variation in pressure heads and hydraulic gradients, assessing their storage and transmissivity, their recharge potential as well as determine their ground water quality.
Pumping test of exploratory well in Tertiary Sandstone, Cuddalore district, Tamil Nadu.
Credit : Jaya Kumar
Example of a tentative 2-dimension aquifer geometry cross section obtained from exploratory borehole drilling.
Source: CGWB