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.
Physiography and Drainage:
- Thiruvarur district is a plain terrain with a gentle slope towards east in the northern and central part and towards 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, Mudikondam, and Arasalar etc.
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 | |
1247.9 | 971.6 | 1128.6 | 1303.7 | 1796.2 | 985 |
Geology:
Rock Type | Geological Formation | ||||
Sedimentary Rock | Laterite, Sand and Silt, Sandstone, Alluvium and Marine deposit |
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 |
5 Years |
5Years |
15.3 |
19.1 |
13.8 |
18.2 |
12.9 |
15.8 |
9.1 |
13.6 |
5.4 |
11.2 |
13.4 | 10.0 |
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 |
168 | 9 | 39 | 25 | 241 |
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%) | 10 | Agarathirumalam, Alangudi, Avoor, Kodavasal, Koradacheri, Kulikkarai, Peralam, Thirukkannamangai, Thiruvizhimazhalai, Valangaiman |
Critical (90%-100%) | 1 | Vadapathimangalam |
Semi Critical (70%-90%) | 3 | Koothanallur, Nannilam, Sannanallur |
Safe (<70%) | 9 | Kottur, Kunniyur, Mannargudi, Nidamangalam, Palaiyur, Thalaiyamangalam, Thiruvarur, Ullikottai, Vaduvur |
Others (Poor & Saline) | 4 | Alathampadi, Edaiyur, Muthupet, Thiruthuraipoond |
Total | 27 |
Rural Habitations
Total No. of Rural Habitations: 2952
Partially covered | 0 (10-39 lpcd ) |
Fully covered | 2952 (40 lpcd and above) |