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Nagapattinam District Profile

  • 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 10º 15’ 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.

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.

Rainfall:

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

Actual Rainfall in mm Normal Rainfall in mm
2017 2018 2019 2020 2021
1629.0 1079.8 1456.4 1430.1 1901.2 985

Geology:

Rock Type Geological Formation
Sedimentary Rock Sand, Sandy Clay, Grey brown Sand, Marine Deposits

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. 5 years average Ground water level in m Below Ground Level for pre and post monsoon is as follows:

Jan
2017

May
2017

Jan
2018

May
2018

Jan
2019

May
2019

Jan
2020

May
2020

Jan
2021

May
2021

5 Years
Pre Monsoon
Average

5Years
Post Monsoon
Average

6.2

8.7

4.4

16.1

3.9

6.7

3.1

11.6

2.0

11.3

9.1 3.4

Sustainability:

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.

Categorization of Firkas:

The status of Categorization of firkas as of March 2020 for the District in is shown below.

Categorisation based on Extraction (as on 2020) No. of Firkas Firkas
Over Exploited (>100%) 13 Kuttalam, Madhanam, Manganallur, Mayiladuthurai, Melaiyur, Palaiyur, Pattavarthi,
Puthur, Sembanarkoil, Sirkali, Thiruvengadu, Thiruvilaiyattam, Vaitheeswarankoil
Critical (90%-100%) 0  
Semi-Critical (70%-90%) 0  
Safe (<70%) 1 Manalmedu
Others (Poor & Saline) 17 Kangalancheri, Kariyapattinam, Keelaiyur, Kilvelur, Nagappattinam, Nirmulai, Thagatur, Thalainayar,
Therkupoigainallur, Thevoor, Thillayadi, Thiurkannapuram, Thirukkuvalai, Thirumarugal, Valivalam, Vedaranyam, Velanganni
Total 31  

Rural Habitations

Total No. of Rural Habitations: 2952

Partially covered 610(10-39 lpcd )
Fully covered 2342(10-39 lpcd )
QAH 169