Annexure-District Survey Report
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8/21/2019 Nagapattinam | TWAD Nagapattinam District Profile Nagapattinam district is bounded in the North by Cuddalore district, in the west by Thanjavur and Thiruvarur districts and in the south and east by the Bay of Bengal. The District lies between 10º15’00 N to 11º 30' 00”N Latitude, 79º 30' 00”E to 79º 55' 00”E Longitude and has an aerial extent of 2377 sq.km. There are 11 Blocks, 434 Villages and 2952 Habitations in the District. Physiography and Drainage The entire Nagapattinam district is a plain terrain with the slope less than 1%. The topographical slope is towards east and southeast. The total length of the coast in the east and south is 225km. The district area falls under two river basins namely Cauvery subbasin, and Vennar subbasin. The district is drained by river like Kollidam and Cauvery in the North, Virasalar, Uppanar in the central part and Arasalar, T.R.Ar, Vettar Ar, Keduvai Ar, Pandavai Ar, Vedaranyam canal, Harichandranadi in the southern part of the district. The district forms the delta part of river Kollidam and Cauvery. Rainfall: The average annual rainfall and the 5 years rainfall collected from IMD, Chennai is as follows: Acutal Rainfall In Mm Normal Rainfall 2013 2014 2015 2016 2017 In Mm 1029.6 1415.0 1747.6 661.4 1629 1392.6 Geology: https://www.twadboard.tn.gov.in/content/nagapattinam 1/5 8/21/2019 Nagapattinam | TWAD Rock Type Geological Formation Sedimentary Rock Sand, Sandy Clay, Grey brown Sand, Marine Deposits Hydrogeology: Fairly Thick Discontinuous Confined Type Of Aquifer Fresh Groundwater Aquifer Overlained By Saline Water Towards The Coast Depth Of Water 1 M To 8m Level 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 Defunct Check Percolation Recharge Recharge Recharge Rooftop Hydro Others Ooranies Bore Well Total Dam Pond Pit Trench Shaft RWH Fracturing Recharge 10 91 5 119 46 271 Groundwater Potential as on March 2011 (as per CGWB): Net Groundwater Availability (In MCM) 159.16 Existing Gross Groundwater draft for all 162.88 users (in MCM) Stage of Groundwater development (in 102 % %) Over - Categorization of District Exploited Categorization of Firkas: The status of Categorization of firkas as of March 2011 for the District is shown below. https://www.twadboard.tn.gov.in/content/nagapattinam 2/5 8/21/2019 Nagapattinam | TWAD Categorisation Based On Extraction (As No. Of Firkas On March 2013) Firkas Kuttalam, Manganallur, Mayiladuthurai, Melaiyur, Palaiyur, Over Exploited (>100%) 11 Pattavarthi, Puthur, Sembanarkoil, Thiruvilaiyattam, Vaitheeswaran Koil, Sirkali Critical (90%-100%) 1 Madhanam Semi-Critical (70%-90%) 0 Safe (<70%) 2 Manalmedu, Thiurkannapuram Kangalancheri, Keelaiyur, Kilvelur, Nagapattinam, Nirmulai, Thagatur, Thalainayar, Therkupoigainallur, Others (Poor& Saline) 17 Thevoor, Thillayadi, Thirukkuvalai, Thirumarugal, Thiruvengdu, Valivalam, Velanganni, Vedaranyam, Kariyapattinam Total 31 Water supply status as on 1.4.2018 Rural Habitations Total No. of Rural Habitations: 2952 Partially Covered 298 (10-39 Lpcd ) Fully covered 2485 (10-39 lpcd ) QAH 169 Urban Towns ( Water Supply Status - 1.4.2018) S.N0 Name Of Towns Population Present Water Supply Level LPCD Municipalities 1 Sirkali 34927 66 https://www.twadboard.tn.gov.in/content/nagapattinam 3/5 8/21/2019 Nagapattinam | TWAD 2 Nagapattinam 102905 90 3 Myiladuthurai 85632 80 4 Vedaranyam 34266 81 Town Panchayats 1 Vaitheeswarankoil 7676 87 2 Kuthalam 16125 75 3 Thittacheri 9245 102 4 Tharangambadi 23191 90 5 Manalmedu 9017 103 6 Velankanni 11108 70 7 Kilvelur 8272 99 8 Thalainayar 12798 105 Ground Water Level: The Ground Water levels from the 26 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: https://www.twadboard.tn.gov.in/content/nagapattinam 4/5 8/21/2019 Nagapattinam | TWAD 5 Years 5Years Jan May Jan May Jan May Jan May Jan May Pre Post 2013 2013 2014 2014 2015 2015 2016 2016 2017 2017 Monsoon Monsoon Average Average 4.40 5.98 4.20 6.13 3.96 5.65 3.35 6.51 6.2 12.2 6.59 4.41 https://www.twadboard.tn.gov.in/content/nagapattinam 5/5.