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• Nagapattinam district is bounded in the North by Cuddalore district, in the west by Thanjavur and Thiruvarur districts and in the south and east by Bay of Bengal.
• The District lies between 10º15’00 N to 11º 30' 00”N Latitude, 79º 30' 00”E to 79º 55' 00”E Longitude and has an aerial extent of 2377 sq.km.
• There are 11 Blocks, 434 Villages and 2952 Habitations in the District.
 Physiography and Drainage:
The entire Nagapattinam district is a plain terrain with the slope less than 1%. The topographical slope is towards east and southeast.
• The total length of the coast in the east and south is 225km.
• The district area falls under two river basins namely Cauvery sub basin, and Vennar sub basin.
• The district is drained by river like Kollidam and Cauvery in the North, Virasalar, Uppanar in the central part and Arasalar, T.R.Ar, Vettar Ar, Keduvai Ar, Pandavai Ar, Vedaranyam canal, Harichandranadi in the southern part of the district.
• The district forms the delta part of river Kollidam and Cauvery.
The average annual rainfall and the 5 years rainfall collected from IMD, Chennai is as follows:
Acutal Rainfall in mmNormal Rainfall in mm
Rock TypeGeological Formation
Sedimentary Rock Sand, Sandy Clay, Grey brown
Sand, Marine Deposits
Type of aquifer Fairly thick discontinious confined
acquifer fresh groundwater overlained by
saline water towards the coast
Depth of Water level1 m to 8m
 Ground Water Level::
The Ground Water levels from the 26 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 is as under.
Recharge Structures
Check Dam Percolation Pond Recharge Pit Recharge Trench Others Ooranies Defunct Bore well Recharge Recharge Shaft Roof top RWH Hydro Fracturing Total
10 91 5 119 46 271
 Groundwater Potential as on March 2011 (as per CGWB):
Net Groundwater Availability (in MCM)159.16
Existing Gross Groundwater draft for all users (in MCM)162.88
Stage of Groundwater development (in %)102 %
Categorization of DistrictOver -Exploited
 Categorization of Firkas:
The status of Categorization of firkas as of March 2011 for the District is shown below.
Categorisation based on Extraction (as on 2011) No. of Firkas Firkas
Over Exploited (>100%) 11 Kuttalam, Manganallur,
Mayiladuthurai, Melaiyur, Palaiyur,
Pattavarthi, Puthur, Sembanarkoil,
Thiruvilaiyattam, Vaitheeswaran Koil,Sirkali
Critical (90%-100%) 1 Madhanam
Semi Critical (70%-90%) 0
Safe (<70%) 2 Manalmedu,Thiurkannapuram
Others (Poor& Saline) 17 Kangalancheri, Keelaiyur, Kilvelur,
Nagappattinam, Nirmulai, Thagatur,
Thalainayar, Therkupoigainallur,
Thevoor, Thillayadi, Thirukkuvalai,
Thirumarugal, Thiruvengdu, Valivalam,
Velanganni, Vedaranyam,Kariyapattinam
Total 31
Water supply status as on 1.4.2017
 Rural Habitations
Total No. of Rural Habitations: 2952
Partially covered611 (10-39 lpcd )
Fully covered2341 (40 lpcd and above)
 Urban Towns (Water supply status - Sep 2016)
S.NOName of Towns Population Present water supply level LPCD
1 Sirkali 34927 74
2 Nagapattinam 102905 89
3 Myiladuthurai 85632 87
4 Vedaranyam 34266 81
Town Panchayats
1 Vaitheeswarankoil 7676 74
2 Kuthalam 16125 75
3 Thittacheri 9245 102
4 Tharangambadi 23191 90
5 Manalmedu 9017 103
6 Velankanni 11108 74
7 Kilvelur 8272 99
8 Thalainayar 12798 105
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