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Saturday , 31st July 2021
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Tiruvannamalai District Profile

  • Tiruvannamalai district is bounded on the North and Northwest by Vellore district and west by Dharmapuri district and south by Villupuram districts and east by Kancheepuram district.
  • The District lies between 12º 00'00’’to 12º 52’30’Northlatitude and East Longitude 78º 39’30’’ to 79º 45’36’’. The total geographical extent of the area is 6190 Sq.Km.
  • There are 18 Blocks, 860 Villages and 4755 Habitations in the District.

Physiography and Drainage

  • The entire district is an undulating terrain with isolated hillocks on the western and north western parts.
  • The western part of the district is covered by Javadhu hill ranges while the eastern part is characterized by isolated hillocks
  • Tiruvannamalai hill occurs right in the centre of the town with an elevation of 800m (2668ft).
  • There are many isolated hillocks and tor complexes seen in Tiruvannamalai, Thandarampet, Chengam, Polur, Arni and Kalasapakkam blocks.
  • The major rivers traversing the area are Ponnaiyar and Cheyyar.
  • The major part of the district falls under the Palar sub catchment and extreme southern part of the district fall under Ponnaiyar sub catchment.

Geology:

Rock Type Geological Formation
Sedimentary Rock 90%,Hard Rock 10% Charnockite, Gneiss, Granite,Sandstone, Shale, Sand and silt and Alluvium

Rainfall:

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

Acutal Rainfall in mm Normal Rainfall in mm
2013 2014 2015 2016 2017
812.80 799.10 1247.4 684.7 1251.3 1039.66

Hydrogeology:

Type of Aquifer Discontinuous unconfined to semi confined aquifers in fissured formations.
Aquifer parameters Hard rock
Well yield in lpm 30 to 250
Transmissivity (T)m2/day 10.2 - 542.8
Permeability (K)(m/day)) 0.39 to 1.56
Depth of Water level 3m to 22m

Ground Water Level:

The Ground Water levels from the 58 number of observation wells of TWAD have been analysed for Post-Monsoon and Pre-Monsoon. Since 1991,the years average Ground water level in m Below Ground Level for pre and post monsoon is as follows:

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

Jan
2013

May
2013

Jan
2014

May
2014

Jan
2015

May
2015

Jan
2016

May
2016

Jan
2017

May
2017

5 Years
Pre Monsoon
Average

5Years
Post Monsoon
Average

3.60

11.13

6.90

13.54

13.91

11.60

3.97

8.65

10.86

26.4

15.44

12.92

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 is as under.

Groundwater Potential as on March 2011 (as per CGWB):

Net Groundwater Availability (in MCM) 1093.34
Existing Gross Groundwater draft for all users (in MCM) 924.37
Stage of Groundwater development (in %) 85%
Categorization of District Semi Critical

Categorization of Firkas:

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

Categorisation based on Extraction (as on March 2013) No. of Firkas Firkas
Over Exploited (>100%) 13 Chengam, Cheyyar, Kilpennathur, Osur
pachal, Melpallipattu, Somaspadi, Malaiyur, Pudupalayam,
Vandavasi, Thandarampat, Thurinjapuram, Veraiyur.
Critical (90%-100%) 16 Kettavarampalayam,Nayadumangalam, Vanapuram, Eraiyur,
Thanipadi, Thatchampattu,Chennavaram,
Vadathandalam, Desur, Kelur, Kilkodungalur, Kolappalur, Nedungunam,
Peranamallur, Santhavasal, Thachambadi
Semi Critical (70%-90%) 19 Anakavoor, Dusi, Kadaladi, Kalasapakkam,
Mandakolathur, Modayur, Polur,
T.V. Malai (South), Vakkadai,
Vinnamangalam, Mullipattu , Nateri,
Thethurai, Mangalam, Agrapalayam, Kannamangalam, Vakkadai, Vettavlam.
Safe (<70%) 4 Perungattur, Sathyavijayanagaram,Vembakkam,Arni.
Others (Poor& Saline) 1 Minjur
Total 52  
Water supply status as on 1.4.2021

Rural Habitations

Total No. of Rural Habitations: 4260

Partially covered 239 (10-39 lpcd )
Fully covered 4021 (40 lpcd and above)

Urban Towns ( Water supply status - 1.4.2018)

S.No Name of Towns Population Present water supply level LPCD
Municipalities
1 Thiruvannamalai 145278 121
2 Vandavasi 31320 99
3 Thiruvathipuram 37802 79
4 Arani 63671 82
Town Panchayats
1 Polur 28123 79
2 Kannamangalam 7399 70
3 Vettavalam 15506 72
4 Chetpet 19827 70
5 Kilpennathur 13718 74
6 Kalambur 14304 72
7 Pudupalayam 11382 70
8 Desur 4597 70
9 Chengam 26980 74
10 Peranamallur 5801 76