Home TamilNadu Map Tiruvannamalai District Profile Print 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. 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 Geology: Rock Type Geological Formation Charnockite, Gneiss, Granite, Sedimentary Rock 90% Sandstone, Shale, Sand and silt Hard Rock 10% and Alluvium Hydrogeology: Discontinuous unconfined to semi Type of Aquifer 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 average Ground water level in m Below Ground Level for pre and post monsoon is as follows: 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. Recharge Structures Roof Check Percolation Recharge Recharge Defunct Bore Recharge Hydro Others Ooranies top Total Dam Pond Pit Trench well Recharge Shaft Fracturing RWH 546 39 9 24 30 648 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 2011 for the District is shown below. Categorisation based on Extraction (as No. of Firkas on 2011) Firkas Chengam, Cheyyar, Kilpennathur, Osur Over Exploited (>100%) 13 pachal, Melpallipattu, Somaspadi, Malaiyur , Pudupalayam, Vandavasi, Thandarampat, Thurinjapuram, Veraiyur. Kettavarampalayam,Nayadumangalam, Vanapuram, Eraiyur, Thanipadi, Thatchampattu,Chennavaram, Critical (90%-100%) 16 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 1.4.2017 Rural Habitations Total No. of Rural Habitations: 4753 Partially covered 42 (10-39 lpcd ) Fully covered 4711 (40 lpcd and above) Urban Towns (Water supply status - Sep 2016) S.NO Name of Towns Population Present water supply level LPCD Municipalities 1 Thiruvannamalai 145278 115 2 Vandavasi 31320 86 3 Thiruvathipuram 37802 85 4 Arani 63671 82 Town Panchayats 1 Polur 28123 70 2 Kannamangalam 7399 81 3 Vettavalam 15506 70 4 Chetpet 19827 70 5 Kilpennathur 13718 74 6 Kalambur 14304 77 7 Pudupalayam 11382 72 8 Desur 4597 71 9 Chengam 26980 81 10 Peranamallur 5801 84.