The Hydrogeology wing of TWAD Board is vested with the responsibility of scientific source identification works in the field of exploration, exploitation, assessment of water sources. It is also committed to ensure conservation and management of the water resources for the sustainability of sources to provide protected, potable water supply to the rural and urban population. TWAD Board executes water supply schemes under the various programmes implemented with Central and State Government financial assistances for which the selection sustainable source is of paramount importance.

 Expertise Available:

Man Power

	A fleet of Hydro-geological personnel with a wide knowledge on ground water exploration, conservation and management of water resources are available. Most of them are post-graduates in Hydro-geological sciences and some are doctors of philosophy in certain specific area of research on ground water sciences.
	Availability of the technical know-how for scientific exploration for sitting of wells for the drinking water supply schemes & industrial water supply schemes.
	Technological availability for identification and exploitation of the groundwater resources.
	Assessment of aquifer characteristics through scientific ways of conducting pumping tests.
	Delineation of aquifer zones through electrical well logging techniques.
	Expertise in scientific identification / site specific location for the construction of the type of recharge structure to be implemented for the sustainability of the drinking water headwork’s / sources under the various programmes executed in TWAD Board.
	Expertise in carrying out the monitoring studies through scientific methodology to assess the impact.
	Analysis of all the Hydrological data to arrive at consensus conclusion.
	Expertise in the Rainwater Harvesting mechanism for innovative design of the various types of recharge structures based on the varied Hydrogeological environs to harness the roof top rainwater harvesting.
	Assessment of groundwater potential zones – regional and local based on micro level studies.
	Assessment of potentiality in a micro level water shed through watershed approach.

 Projects implemented:

	Implemented the UNICEF assisted Water Resources Management Study in Karaipottanar Watershed in Namakkal district of Tamil Nadu State.
	Completed the Project on the preparation of District Water resources Atlas under Unicef Assistance.
	Completed the project on Lineament Analysis using Digital data for creating the sustainable drinking water source for rural areas of Gingee Taluk, Villupuram District.
	Completed the project on Recharge through Bore Blasting in Muttanchetty Micro watershed in Dindugal district.
	Completed the project on recharging the groundwater through defunct bore wells in Puduchatram block of Namakkal district of Tami Nadu.
	Completed State Planning commission funded project on “Updating the groundwater potential Zonation map” using remote sensing and GIS for all the 385 bocks of the State.

 Infra Structure available:

	Sophisticated equipments (Resistivity meters)– both indigenous and imported (Signal Averaging System) – for ground water exploration.
	Hydro fracturing equipments for rejuvenation/ reviatalisation of failed/ low yielding bore wells (hard rock areas) to enhance the specific capacity of the bore wells.
	Electrical logger and Pumping test units for delineation and assessment of aquifer parameters.
	Remote Sensing data products – Satellite Imagery, Aerial Photographs, GOI Topo sheets with thematic maps and derived maps and related equipments such as – Mirror Stereoscope, Planimeter, Optical Pentograph, etc.,
	Availability of the software - Arc INFO, Arc View, Erdas, Geomatica for taking up GIS application based Projects and for further updating and Related Hardware and Software required for the R & D works.
	Availability of the Digital database for the entire State of Tamil Nadu.
	Availability of the Zonation maps for recharge studies based on the Recharge Project Study undertaken by TWAD Board in collaboration with the Institute of Remote Sensing, Anna University.
	Data Centre comprising of rainfall data, water level data, geophysical resistivity data, hydro fracturing data, pumping test data, block wise information data, basin wise information, etc.,
	District wise Hydrogeological reports, Journals and Periodicals etc.,

 Present Activities:

	Source identification and source creation works for the 4141 IPP schemes and for the 2859 CWSS schemes targeted for the year 2010-2011 have been achieved.
	Formulating proposals for clearance of Water Utilization Committee major water supply schemes, which require more than 1 MGD(4.5MLD) of water from the rivers.
	Monitoring of progress on the implementation of 2507 recharge structures at a cost of Rs. 63.38 Crores under NRDWP- Sustainability for the year 2010-2011.
	Monitoring of progress on the implementation of 438 recharge structures at a cost of Rs. 24.00 Crores under the State Government funded Master Plan – Artificial Groundwater Recharge Structures programme for the year 2010-2011.
	Monitoring of the Traditional Oorani Improvement Project – 342 nos implemented under NABARD RIDF XIII assistance, submission of Project Completion Reports (PCR’s) and allied correspondences including reporting to the High Power Committee meeting convened by the Chief Secretary.
	Collection of weekly, monthly and annual rainfall data for all districts in Tamil Nadu from Indian Meteorological Department (IMD) and Revenue Department.
	Collection of Water level data for the premonsoon (May 2010)and post monsoon (Jan2011) from 1286 TWAD Board Observation Wells, compilation and analysis and generation of reports on the groundwater scenario for communication to the District Administration, Regional Chief Engineers and Superintending Engineers for reference.
	Locations of all the headworks in the riverbed have been prepared and action is being taken to represent them spatially under the GIS platform.
	Impact study to assess the efficacy of the recharge structures through monitoring of water level data for the 5869 structures implemented since 2001-2002 to 2009-2010.
	Impact study to assess the efficacy of the recharge structures through monitoring of water level data under SPC funded Project in select villages of Gingee Taluk, Villupuram District.
	Preparation of Water resources infrastructure Asset map for the State.
	In respect of Ground Water Prospect Maps. i) Geology and structure of 220 Toposheets completed. ii) Structure map (lineament map for 40 Toposheets completed. iii) For quality check purpose all thematic layers pertains one Toposheet No.58M/1, (Villupuram District) has been completed as per NRSC            guidelines. Quality check has been successfully completed and accepted by the Internal quality check Committee.

Fracturing Techniques

R & D Activities and GIS Cell

Scientific Source Finding Activities

Recharge Structures

Check Dam

Sub Surface Dykes