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• 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 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, Mudikondan, and Arasalar etc.
The average annual rainfall and the 5 years rainfall collected from IMD, Chennai is as follows:
Acutal Rainfall in mmNormal Rainfall in mm
Rock TypeGeological Formation
Sedimentary Rock Laterite, Sand and Silt,
Sandstone, Alluvium and Marine
Type of Aquifer Fairly thick discontinious confined
acquifer fresh groundwater overlained
by saline water towards the coast.
Depth of Water level1 m to 8m
 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. Since 1991 average Ground water level in m Below Ground Level for pre and post monsoon is as follows::
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.
Recharge Structures
Check Dam Percolation Pond Recharge Pit Recharge Trench Others Ooranies Defunct Bore well Recharge Recharge Shaft Roof top 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 DistrictSemi Critical
 Categorization of Firkas:
The status of Categorization of firkas as of March 2011 for the District is shown below.
Categorisation based on Extraction (as on 2011) No. of Firkas Firkas
Over Exploited (>100%) 9 Agarathirumalam, Alangudi, Avoor,
Kodavasal, Koradacheri, Kulikkarai,
Peralam, Thirukkannamangai,
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,
Total 27
Water supply status as on 1.4.2017
 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 - Sep 2016)
S.NOName of Towns Population Present water supply level LPCD
1 Kuthanallur 25423 90
2 Mannargudi 66999 90
3 Thiruvarur 58301 90
4 Thiruthuraipoondi 24404 90
Town panchayats
1 Valangaiman 11754 73
2 Needamangalam 9336 75
3 Peralam 6149 74
4 Muthupet 21722 74
5 Koradacheri 6450 73
6 Kodavasal 14639 74
7 Nannilam 12618 72
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