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 |
May |
Jan |
May |
Jan |
May |
Jan |
May |
Jan |
May |
5 Years |
5Years |
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.
Recharge Structures | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Check Dam | Percolation Pond | Recharge Pit | Recharge Trench | Others | Ooranies | Defunct Bore well Recharge | Recharge Shaft | Rooftop RWH | Hydro Fracturing | Total |
10 | 91 | 5 | 119 | 46 | 271 |
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 |