Ariyalur district `has been carved out of Perambalur district and is bounded by the districts of Cuddalore in the north and north-east, Nagapattinam in the east, Thanjavur in the south and south-east, Tiruchirapalli in the south-west and Perambalur in the west.

The district lies between 10°53’00’’ to 11°26’00’’ Northern latitude and 78°56’00’’ to 79°31’00’’ Eastern longitude and has an areal extent of 1,944 sq.km.

• There are 6 Blocks, 201 Villages and 1574 Habitations in the District.

• Ariyalur district forms parts of Vellar and Cauvery Rivers basins.

• Cauvery River fringes the southern boundary of the district. River Vellar drains in the northern part and River Marudaiyar flowing in the south confluences with R.Coleroon as a tributary.

The average annual rainfall and the 5 years rainfall collected from IMD, Chennai is as follows:

The Ground Water levels from the 27 number of observation wells of TWAD have been analysed for Post-Monsoon and Pre-Monsoon. Since 1991, average Ground water level in m Below Ground Level for pre and post monsoon is as follows:

With a view to enhance the Sustainability of the drinking water sources, recharge structures are being implemented by TWAD Board under various State and Central Government assistances.

The Recharge Structures implemented so far in district is as under.

The status of Categorization of Firkas as of March 2013 for the District in is shown below.