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• Dharmapuri district is bounded by Krishnagiri district in the North, Tiruvannamalai and Villuppuram districts in the East, Salem district in the South and R.Cauvery in the west.
• The District lies between 11º47'40’’N to 12º33’40’’ N Latitude, 77º33'30’’E to 78º40'00’’E Longitude and has an areal extent of 4498 sq.km.
• There are 8 Blocks, 251 Villages and 3445 Habitations in the District.
 Physiography and Drainage:
• Major rivers of the district are the Cauvery River and Ponnaiyar. R. Cauvery originating from Karnataka State enters the district at Hogenekkal, and drains into the Mettur Dam in Salem district.
• Ponnaiyar is the other major river draining the district and is ephemeral in nature. It originates from Nandhi hills in Karnataka, enters Tamil Nadu west of Bagalur and flows almost in a south easterly direction till it reaches Doddampatti from where it takes an easterly course.
• Pambar, Vaniyar and Kallar are the important tributaries of Ponnaiyar draining the eastern part of the district whereas the Chinnar and Markandeya Nadhi drain the northern part of the district.
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
Hard RockGranite, Charnockite, Gneiss,
Pegmatite, Quartzite
Type of aquifer Discontinuous unconfined to semi confined
aquifers in fissured formations.
Aquifer parameters: Well yield in lpm36 – 1125
Transmissivity (T) m2/day8 – 73
Permeability (K)m/day0.78 - 23
Depth of Water level8m to 25m
 Ground Water Level::
The Ground Water levels from the 37 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
356 3 6 3 25 393
 Groundwater Potential as on March 2011 (as per CGWB):
Net Groundwater Availability (in MCM)375.84
Existing Gross Groundwater draft for all users (in MCM)497.30
Stage of Groundwater development (in %)132
Categorization of DistrictOver -Exploited
 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 2013) No. of Firkas Firkas
Over Exploited (> 100%) 14 Bommidi, Indur, Kadathur, Kambainallur,
Karimangalam, Marandahalli, Palacode,
Palayam, Papparapatty, Pennagaram,
Perumbalai, Pulikarai, Thenkaraikottai,
Critical (90%-100%) 3 Morappur,Nallampalli,Pappireddipatty
Semi Critical (70%-90%) 5 Dharmapuri, Harur, Krishnapuram
Sunjalnatham, Theerthamalai,
Safe (<70%) -
Others (Poor& Saline) -
Total 22
Water supply status as on 1.4.2017
 Rural Habitations
Total No. of Rural Habitations: 3445
Partially covered5 (10-39 lpcd )
Fully covered3440 (40 lpcd and above)
 Urban Towns (Water supply status - Sep 2016)
S.NOName of Towns Population Present water supply level LPCD
1 Dharmapuri 68619 121
Town Panchayats
1 Marandahalli 12451 82
2 Karimangalam 13511 70
3 Palakode 20959 70
4 Harur 25469 70
5 Kadathur 11382 70
6 P.Mallapuram 12705 70
7 Pappireddipatti 9369 71
8 Kambainallur 12194 85
9 Pennagaram 17480 70
10 Papparapatti 12174 71
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