Ground Water Information Booklet South Tripura District, Tripura
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Technical Report Series: D No: 55/2011-12 Ground Water Information Booklet South Tripura District, Tripura Central Ground Water Board North Eastern Region Ministry of Water Resources Guwahati March 2012 AT A GLANCE South Tripura District, Tripura SL. ITEMS STATISTICS NO. 1. GENERAL INFORMATION i) Geographical Area (sq. km) 3074.78 ii) Administrative Divisions (as on31.3.2008) No. of Blocks 11 No. of Panchayats 153 No of ADC villages 167 iii) Population (as per 2001 census) 7,67,440 iv) Average Annual Rainfall (mm) 2055 2. GEOMORPHOLOGY Major Physiographic units Hills-Baramura and Atharamura Valleys-Udaipur and Belonia Major Drainages Gomti, Muhuri and Fenny 3. LAND USE (SQ. KM)(2007-08) a) Forest Area 2065.75 (67.18%) b) Net area sown 777.28 (25.27%) c) Cultivable area 1443.07 4. MAJOR SOIL TYPES Transported soil, residual soil and lateritic soil. 5. AREA UNDER PRINCIPAL CROPS (Ha) Rice 81457 ha (2006-07) Potato 2438 ha Total pulses 2188 ha Total oil seeds 1093 ha 6. Irrigation by Different Sources(2006-07) (Areas and Numbers of Structures) Dug wells Nil Tubewells / borewells 850 ha Tanks / ponds Nil Canals Nil Other sources Lift irrigation: 15704 ha /50 nos Diversion 921 ha/18 nos Medium irrigation 2886 ha Net Irrigated Area 18,325 ha Gross Irrigated Area 31,702 ha 7. NUMBERS OF GROUND WATER MONITORING WELLS OF CGWB (As on 31.03.08) No. of Dug wells 7 No. of Piezometers 0 8. PREDOMINANT GEOLOGICAL Recent formation of Quaternary age and FORMATION Dupitila, Tipam and Surma formations of Upper Tertiary age. 1 9. HYDROGEOLOGY Major water bearing formation Tipam sandstone Pre-monsoon depth to water level during 2008 1.42 – 5.82 m bgl Post-monsoon depth to water level during 2008 0.90 – 5.10 m bgl Long term trend for 10yrs (1999-2008) in m/ yr Pre-monsoon Rise- 3 stations 0.173 - 0.205 Fall- 1 stations 0.0.011 Post-monsoon Rise- 4 stations 0.035 - 0.081 Fall- 4 stations 0.059 - 0.205 10. GROUND WATER EXPLORATION BY CGWB (As on 31.03.08) No. of wells drilled (EW, OW, PZ, SH, Total) EW = 16 nos. OW = 3 nos. PZ = 2 nos. Total = 21 nos. Depth Range (m) 197 – 215 Discharge (lps) 3.33 to 44 Storativity (S) 2.4 x 10-3 to 2.25 x 10-5 Transmissivity (m2/ day) 47.4 to 1577 11. GROUND WATER QUALITY Presence of chemical constituents more than Iron up to 3.66 ppm (in deeper aquifer) permissible limit (e.g., EC, F, As, Fe) Type of water 12. DYNAMIC GROUND WATER RESOURCES (2004) in mcm Annual Replenishable Ground Water Resources 587.5 Net Ground water Draft 41.86 Projected demand for domestic and industrial uses 38.68 up to year 2025 Stage of ground water development 7.13 % 13. AWARENESS AND TRAINING ACTIVITY Mass Awareness programme organized Nil Water Management Training Programme organized Nil 14. EFFORTS OF ARTIFICIAL RECHARGE & RAINWATER HARVESTING Projects completed by CGWB (no. & amount spent) Nil Projects under technical guidance of CGWB (nos.) Nil 15. GROUND WATER CONTROL AND REGULATION No. of OE blocks Nil No. of Critical blocks Nil No. of blocks notified Nil 16. MAJOR GROUND WATER PROBLEMS AND Ground water contains high iron ISSUES concentration. In shallow aquifer conc. of iron varies from 0.08 to 0.65 ppm and in deeper aquifer it varies from 0.5 to 3.66 ppm. 2 1.0 INTRODUCTION South Tripura district is situated between North Latitudes 22º58/00// and 23º45/00// and East Longitude 91º15/30// and 91º58/30// falling in the Survey of India degree sheet number 79M. It is bounded by Bangladesh on south, east and west sides, by west Tripura district on north and northwestern sides and by Dhalai district on northeast side. The total geographical area of the district is 3074.78 sq.km. Udaipur is the ditrict head quarters. Administratively, the district is divided into 4 nos. of sub–divisions which are in turn sub-divided into 11 nos. of blocks. There are 153 gram panchayats and 167Autonomous District Council (ADC) villages in the district. Forests cover 2065.75 sq.km (67.18%) of the total district. Land not available for agricultural use is 221.50sq.km (7.20%). The net area sown is 77728 ha which is only 25.27% of the total geographical area. As per 2001 census, the total population of the district is 767,440 persons with a density of 250 persons/ sq.km. The decadal growth rate is 6.78 (1991-2001). Drainage The anticlinal hill ranges forms the watersheds from which various drainage channels emerged. The district is drained by many perennial rivers. The major rivers are Gomti, Muhuri, Fenny etc (fig.1). These perennial rivers are a part of Gomti sub-basin which in turn forms a part of Meghna basin. The common drainage patterns are sub-parallel to parallel and dendritic. Up to 4th order streams are found in the area. Irrigation There is no major irrigation project in the district. However there are two medium irrigation projects in the district namely 1.Gomati irrigation project and 2. Muhari irrigation project. The gross command area under the two projects is 5220 and 2600 ha respectively. The total irrigation potential created so far (2006-07) is 20361 ha only i.e., only about 26% of the net sown area. Agriculture is mostly dependent on minor irrigation schemes apart from rainfall. The minor irrigation schemes found in the area are (1) lift irrigation schemes on perennial rivers and cherras, (2) diversions (3) weir (4) tanks, (5) deep tubewells (6) shallow tubewells and (7) artesian wells. The major crops grown in the area are rice, pulses, oilseeds, potato and other crops. Cropping pattern in the area is paddy oriented. During the year 2006-07, rice is a major crop grown with 28,813 ha. During Kharif season farmers cultivate Aman paddy, the main crop of the district. This crop rarely requires any irrigation due to abundant rainfall during the period. Total irrigation potential created is 20361 ha. The surface water schemes constitute 19511 ha (96%) and the ground water irrigates only 850 ha (4%) of the total irrigation potential created. This shows that the ground water utilization is in the primitive stage in the district. 3 Studies / Activities carried out by CGWB The earlier work on the hydrogeological conditions of Tripura state was carried out by the officers of the Ground Water Division of Geological Survey of India and later by the officers of the Central Ground Water Board. Systematic hydrogeological investigations carried out in the district during 1972–75. Then the district is covered by Re-appraisal hydrogeological investigations. Under ground water exploration sixteen exploratory and three observation wells and piezometers constructed by the Board. During 2004–05, ground water management studies in the entire district except Dumburnagar block was carried out. 2.0 RAINFALL AND CLIMATE Rainfall The district is having 4 nos. of rain gauge stations located at Udaipur, Belonia, Amarpur and Sabroom. The average annual rainfall for last 35 years (1971 – 2008) of the area is 2055 mm. The average monsoon rainfall for lat 10 years is 1710 mm. The average nos. of rainy days for last 5 years is 95. Maximum rainfall of 5900 mm (1993) recorded at Sabroom and minimum rainfall of 1352 mm (1994) recorded at Udaipur. The co-efficient of variation of rainfall in the area ranges from 6 – 32% suggested a low variability of annual rainfall. Climate The climate in the area is characterized by moderate temperature and is highly humid in nature. There are three prominent seasons summer, rainy and winter. The summer season spans from March to May and is followed by SW monsoon lasting till September. Winter season starts from November and lasts till the end of February. Other Climatic features The temperature in the area varies from 5.1oC to 35.6oC. The humidity is generally high throughout the year. In summer season the relative humidity varies between 50 to 90 percent and in rainy season, the relative humidity is over 85 percent in morning and in evening it varies between 70 to 80 percent. 3.0 GEOMORPHOLOGY AND SOIL TYPES Geomorphology Physiographically, the area can be divided into two parts, Anticlinal Hill Ranges and Synclinal flat-bottomed valleys. The major hill ranges are Baramura and Atharamura. The trend of the hill ranges is almost N – S. The height of the hill ranges increases from west to east. The broad synclinal valleys are Udaipur and Amarpur. The valleys are gently undulating with intermittent flood plains of rivers and streams. The undulations formed by 10 to 30 m high mounds with gullies in between them, locally called “loonga.” 4 Soils In general, soils of the area are acidic in nature. The pH of soil ranges from 5.50 to 5.68. Nitrogen and phosphate is low, available potash is medium to high, calcium, magnesium and sulfur are deficient in these soils. In the area lateritic soil is found in tilla (hilly / small mounds) area, younger soils or river valley soils are found along all major river courses, clayey soils are found in paddy fields. Apart from these, sandy loam, clayey loam and loamy soils are also available. 4.0 HYDROGEOLOGY Water Bearing Formations There are three hydrogeological units / water bearing formations identified in the district are Alluvial formation, Dupitila formation and Tipam formation and are shown in fig.1. The details of the water bearing formations are as follows: Alluvial formation: It occurs along the banks of main rivers and its thickness varies from 10 to 15 m.