Thiruvarur District Profile
- Thiruvarur district is bounded on the north by Nagapattinam district, on the south by Palk strait, on the east by Pondicherry (Karaikkal part) and Nagapattinam district and on the west and north-west by Thanjavur district.
- The District lies between 10º 10'00”N to 11º 01'00”N Latitude, 79º 13'00”E to 79º 43'00”E Longitude and has an aerial extent of 2417 sq.km.
- There are 10 Blocks, 431 Villages and 2977 Habitations in the District
Physiography and Drainage
- Thiruvarur district is a plain terrain with a gentle slope towards the east in the northern and central part and towards the south in the southern part.
- The maximum surface elevation is about 30.0m in the western part of the district.
- The district area falls under three river basins namely Cauvery sub-basin, Vennar sub-basin and new delta area.
- The district is irrigated and drained by the rivers Vennar, Vettar, Mudikondan, and Arasalar etc.
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 | 2018 | |
1045.90 | 953.60 | 918.40 | 645.3 | 1247.9 | 971.6 | 1173.3 |
Geology:
Rock Type | Geological Formation | ||||
Sedimentary Rock | Laterite, Sand and Silt,Sandstone, Alluvium and Marine deposit |
Hydrogeology:
Type of Aquifer | Fairly thick discontinious confined acquifer fresh groundwater overlained by saline water towards the coast. | |
---|---|---|
Depth of Water level | 1 m to 8m | |
Sustainability:
With a view to enhancing the Sustainability of the drinking water sources, recharge structures are being implemented by TWAD Board under various State and Central Government assistance.
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 | Rooftop RWH | Hydro Fracturing | Total |
168 | 9 | 39 | 25 | 241 |
Groundwater Potential as on March 2011 (as per CGWB):
Net Groundwater Availability (in MCM) | 299.80 |
Existing Gross Groundwater draft for all users (in MCM) | 214.20 |
Stage of Groundwater development (in %) | 71% |
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%) | 9 | Agarathirumalam, Alangudi, Avoor, Kodavasal, Koradacheri, Kulikkarai, Peralam, Thirukkannamangai, Valangaiman. |
Critical (90%-100%) | 1 | Thiruvizhimazhalai. |
Semi Critical (70%-90%) | 3 | Koothanallur, Sannanallur, Nannilam |
Safe (<70%) | 10 | Kottur(T), Kunniyur, Mannargudi, Nidamangalam, Palaiyur(T), Thalaiyamangalam, Thiruvarur, Ullikottai, Vadapathimangalam, Vaduvur. |
Others (Poor& Saline) | 4 | Alathampadi, Edaiyur, Thiruthuraipoondi, Murhupet. |
Total | 27 |
Water supply status as on 1.4.2018
Rural Habitations
Total No. of Rural Habitations: 2952
Partially covered | 0 (10-39 lpcd ) |
Fully covered | 2952 (40 lpcd and above) |
Urban Towns ( Water supply status - 1.8.2019)
S.No | Name of Towns | Population | Present water supply level LPCD |
---|---|---|---|
Municipalities | |||
1 | Kuthanallur | 25423 | 90 |
2 | Mannargudi | 66999 | 90 |
3 | Thiruvarur | 58301 | 90 |
4 | Thiruthuraipoondi | 24404 | 90 |
Town panchayats | |||
1 | Valangaiman | 11754 | 70 |
2 | Needamangalam | 9336 | 70 |
3 | Peralam | 6149 | 70 |
4 | Muthupet | 21722 | 70 |
5 | Koradacheri | 6450 | 70 |
6 | Kodavasal | 14639 | 70 |
7 | Nannilam | 12618 | 70 |
Ground Water Level:
The Ground Water levels from the 19 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 |
Jan 2018 |
May 2018 |
Jan 2019 |
May 2019 |
5 Years |
5Years |
7.40 |
13.04 |
7.10 |
11.17 |
4.20 |
7.30 |
3.71 |
8.74 |
8.47 |
15.0 |
13.8 | 18.2 | 12.8 | 15.8 |
9.1 |
13.3 |