gwssb

Geohydrology

Distinct Geological and Geohydrological conditions of the Gujarat state govern the varied region wise water availability. Tribal areas of NE and Eastern Gujarat have erratic rainfall, rocky area and steep terrains, which results in low retention of water. Tribal belts of SW Gujarat have high rainfall with low retention of water resources due hard rock formations and steep terrains. Thus availability of water in tribal areas is limited. North Gujarat and Kachchh region with arid to semi arid environ, receive erratic and relatively less rainfall. This has resulted in deep drilling of tube wells and over exploitation of deeper aquifers with excess power consumption in the area. Saurashtra region is an area of compact basaltic formation with radial drainage system. Retention of water is limited to cracks and fissures. Fringe boundaries of entire Saurashtra have an impact of salinity due to desert and coastal area.

Increased demand for Agricultural, Industrial and domestic use made groundwater the prime source and hence started facing over exploitation without any emphasis on proper management of the resource. Subsequent drop in water levels due to this phenomenon has also resulted in deterioration of quality.

Development of groundwater sources plays a major role in resource management and effective water supply on sustainable basis. Hydro-geological knowledge and latest technology is being used to explore ground water in the state and same knowledge and technology, at a large scale, is being used by water supply department to make the sources sustainable by practicing methods of artificial recharge and rainwater harvesting. Limited availability of water resources in the state has necessitated a holistic water management approach with proper planning and scientific inputs.

Gujarat faces quantity/quality contamination problems in respect of Salinity, Fluoride and Nitrates. Earlier it was envisaged that it is a difficult task to ensure safe and protected water supply to the communities. However,Scientific Management of Water resources with emphasis on Artificial Recharge have addressed the problem to a large extent. There is an explicit demand for the water management, and Geohydrological branch of GWSSB caters to such requirements of water management of Scientific Source finding and groundwater Conservation, harvesting and artificial Recharge.

Activities of Hydro-Geological Branch

  Activities of Geological branch Mode of Implementation
A Survey and Investigations under:
1 Action Plan

Scientific approach of Investigations for source finding

Remote sensing study :
Demarcation of lineaments and potential zones
Well inventory :
Assessment of Geo-hydrological conditions in local sources
Local interaction :
Sharing the experience of locals by Enquiry
Water level & Quality study :
To assess the status of aquifers
Geophysical survey in hard rock areas :
To assess the subsurface formation
Finalization of sites :
After analysis of data from above activity
2 Deposit Work –Govt. agencies
3 WASMO
4 VIP reference
5 Deposit works (Others)
6 Rejuvenation
7 Scarcity works/ Emergency works
8 Regional WSS special Investigations
9 Recharge Activity
10 Water budgeting exercises with community participation
B Water budgeting exercises with community participation
1 Attending Drilling sites For time log, litho log preparations etc.
2 Electro logging of pilot bores in alluvial areas
(also carried out as deposit work activity)
To assess aquifer thickness and quality - Since 1984 works worth more than Rs. 300 lakhs
(Rs.Three hundred lakhs ) have been carried out with available three units only)
3 Finalization of pipe assembly After studying the Litho log, electro log and surrounding tube well data
4 Attendance during well development For proper lowering of assembly, grouting, Gravel packing and cement sealing, clay ball packing
5 Compressor Test To activate the aquifer input for sand free discharge
6 Pump Test To assess the specific yield of the formation, which helps in designing the pumping machinery
C Data analysis, Documentation, Project preparation and other activities
1 Blanket Recharge projects Planning & Preparation of Recharge project reports to strengthen the bulk aquifer system
2 Activities of Source Finding Committee (SFC) Compilation of data for RWSS in problematic areas and submission to SFC for approvals
3 Monitoring Monitoring of survey progress, water levels, water quality, Recharge structures, etc
4 Data bank creation Preparation of bore/ tube well data, maps, etc.
5 Assembly and parliament issues Coordination with field offices to respond to the queries by State and Central Govt. and RTI
6 Training / workshops / seminars Address the training needs in coordination with State and Central Govt. departments like CPHEEO, CGWB, GWRDC,BISAG

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