- Geophysical prospecting with hydrogeological investigation/research for assessment and identification of groundwater resources potential in specific areas
- Extensive hydrogeological mapping to coastal sedimentary basins and hard rock terrains for the implementation of sustainable groundwater development/management programs in high priority areas.
- Development of groundwater resources under all geological conditions to design and subsequent implementation of micro-scale water supply systems for all purposes.
- Performing long duration pumping test for determine the aquifer characteristics, safe yield and water quality variations.
- Feasibility studies for prospecting groundwater resources development in high economic zones.
- Assessment studies on the impact of groundwater resources due to mining activities and other environmental issues.
- Implementations of artificial groundwater recharge in water sources or high abstraction areas to maintain the long term sustainability of groundwater.
- Conducting programs and implementing migratory measures for control water pollution/ conservation of springs.
- Groundwater quality monitoring to demarcate the health hazardous zones and identity spatiotemporal variations.
- Conducting awareness programs in the importance of safe and sustainable use of groundwater utilization and managing of water resources for domestic, industrial and agricultural purposes for the civil society through training.
- Advisory role to the government or non-government organizations related to groundwater
- Activity description
- EIA survey
Environmental assessment (EA) is the assessment of the environmental consequences (positive negative) of a plan, policy, program, or actual projects prior to the decision to move forward with the proposed action. In this context, the role of Water Resources Board is to consider about the hydrogeology of the area and detect the impact for the groundwater as a result of implementing specific projects or actions. Here, it’s consider about the current hydrogeological environment and give recommendations for protection, conservation, minimizing the negative impacts and sustainable development of hydrogeological setup of the area including ecology and sociology.
Environmental assessments may be governed by rules of administrative procedure regarding public participation and documentation of decision making, and may be subject to judicial review.
- Groundwater investigation
- 1D resistivity survey
The aim of the 1D resistivity survey is to determine the sub surface conditions including structural weak zones, thickness of soil overburden, weathered rock and to observe changes in the quality of groundwater with depths. Water Resources Board carry out 1D surveys in order to study the subsurface conditions in detail. The high-end instruments use to obtain the apparent resistivity values of the sub surface formation according to different electronic configuration (Slumburger, Wenner, etc.)
2.2D resistivity surveys (electrical resistivity imaging(ERI))
Electrical resistivity tomography (ERT) or electrical resistivity imaging (ERI) is a geophysical technique for imaging sub-surface structures from electrical resistivity measurements made at the surface, or by electrodes in one or more locations. If the electrodes are suspended in the boreholes, deeper sections can be investigated. A related geophysical method, induced polarization (or spectral induced polarization), measures the transient response and aims to determine the subsurface chargeability properties.
The AGI SuperSting R8/IP earth resistivity meter is the instrument use for 2D resistivity surveys of Water Resources Board. This instrument is use for resistivity & IP imaging in applications such as groundwater exploration, geo-technical & engineering investigations, horizontal drilling, mapping of pollution plumes, cavity detection, archaeological and environmental work etc.
3.Pumping tests
A pumping test is conducted to evaluate the amount of water that can be pumped from a particular water well. More specifically, a well test will allow prediction of the maximum rate at which water can be pumped from a well, and the distance that the water level in the well will fall for a given pumping rate and duration of pumping.
Well testing differs from aquifer testing in that the behavior of the well is primarily of concern in the former, while the characteristics of the aquifer (the geological formation or unit that supplies water to the well) are quantified in the latter.
When water is pumped from a well the water level in the well falls. This fall is called drawdown. The amount of water that can be pumped is limited by the drawdown produced. Typically, drawdown also increases with the length of time that the pumping continues.
According to the well type and flushing yield of the well, the duration of the test may vary as 6 hours, 24 hours, 48 hours and 72 hours.
