# Understanding the role of land use, land cover, and the climate change on the fluoride concentration and groundwater availability in Telangana region, India

Dr Machender Ganaboina

Department of Geology, Mahatma Gandhi University, Anneparthy, Nalgonda (TS) 508254

Professor A.L. Ramanathan

Professor, Jawaharlal Nehru University, New Delhi 110067

## Abstract

The main objectives in conducting the present studies are to minimize the cost of investigation and to maximize the results for analyzing and evaluating the quality and availability of groundwater researches. Climate change is “a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods. Climate fluctuations are not unusual. In the North Atlantic Sector, for example, it is well known that the average temperatures and winds can fluctuate on decadal time scales. Climate changes caused by humans (anthropogenic) also evolve over the course of several decades. The natural decadal changes and those caused by humans are therefore superimposed upon one another. This makes it difficult to assess the impact of humans on climate with certainty. And also, proper understanding of the problem (Fluoride) of relation between geology, distribution, it is also proposed to investigate different aspects like land use and land cover, rainfall, climate, evapotranspiration, runoff, infiltration and water level fluctuation. To propose suitable remedial measures to reduce groundwater pollution in the area as well as water quality and availability. Correlation of Social problems of the area. The details of this research paper will also create awareness among the common public as to how to overcome the problems associated with groundwater pollution and remediation of the contaminated sites due to agricultural, industrial activities and urbanization. The Fluoride occurrence in groundwater is a natural phenomenon influenced by the local and regional geological setting. It is unique substance for which there are both lower and upper limits of concentration in drinking water with identified advantages and disadvantages. Granitic rocks contain a relative abundance of fluoride-rich minerals such as micas, apatite and amphiboles etc. Fluorite (CaF2) is the principal fluoride mineral, mostly present as an accessory mineral in granites. To explore the causes of high fluorides in groundwater and surface water causing a widespread incidence of fluorosis in local population. Groundwater is affected by many factors such as physico-chemical characteristics of soil, rainfall, soil erosion, weathering of rocks, chemical reactions below land surface, role of micro-organism, human and agricultural wastes and industrial effluents. Soils serve as a medium through which groundwater is recharged and any constituent added to soil may adversely affect the quality of groundwater. Anthropogenic and geogenic activities are a major source of metal pollution of soils. Thus, we have proposed scientifically the study area for research work.

Keywords: LU & LC, climate change, fluoride and groundwater

## Abbreviations

Abbreviations
 LU Land use LC Land cover

## Objectives of the Proposed Research Work

1. To Understanding the role of land use, land cover, of Telangana region.

2. To study the climate change on the fluoride concentration and groundwater availability in Telangana region.

3. To study of previous samples from different media like groundwater, stream water and tank water (i.e. surface water) and soils of Telangana region.

4. Study about the Structural and Geological control over Groundwater potentials and availability of the area.

5. Ascertain the quality of Groundwater and whether it quality is controlled by agricultural practices or parental material (rocks) or anthropogenic activity.

6. Assess the level of contamination.

7. Ascertain the suitability of water for domestic/irrigation/ industrial purposes.

8. To study the chemistry of water and soils of the area for assessment of environmental monitoring and Propose remedial measures to reduce the groundwater pollution.

9. Migration of the elements into the soils, groundwater, surface water.

## METHODOLOGY

1. Collection of literature survey and rainfall data of Telangana State.

2. Preparation of Geomorphological, Geological map of the area.

3. Preparation of Drainage, Land use and Land cover, Slope, Soil Resource, Elevation with Contour maps, Groundwater prospecting maps and Structural maps of Telangana region.

4. To study of previous samples of groundwater, stream water, tank water from pre-to post-monsoons samples in the area.

5. Data processing and analysis was carried out by Softwares like GIS, Surfer, Grapher, Aquachem and SPSS.

6. Interpretation of field geological and structural and laboratory (chemical) data.

7. Organizing research outcome in the form of Report.

## STUDY AREA

Telangana is a State in India situated on the centre-south stretch of the Indian peninsula on the high Deccan Plateau (Fig 1). It is the twelfth largest state and the twelfth-most populated state in India with a geographical area of 1,12,077 Sq. Km (43,273 sq mi) and 35,193,978 residents as per 2011 census. On 2 June 2014, The Telangana region was part of the Hyderabad state from Sept 17th 1948 to Nov 1st 1956, until it was merged with Andhra state to form the Andhra Pradesh state. After decades of movement for a separate State, Telangana was created by passing the AP State Reorganization Bill in both houses of Parliament. The area was separated from the northwestern part of Andhra Pradesh as the newly formed 29th state with Hyderabad as its historic permanent capital. Its other major cities include Warangal, Nizamabad, Khammam and Karimnagar. Telangana is bordered by the states of Maharashtra to the north, Chhattisgarh to the east, Karnataka to the west, and Andhra Pradesh to the east and south. The terrain of Telangana region consists mostly of hills, mountain ranges, and thick dense forests distribution of 27,292 sq. km. As of 2019, the state of Telangana is divided into 33 districts (Fig 2 & 3). The “Environment” is a complex system with physical, biological, geological, ecological, and geopolitical aspects. Studying it requires multidisciplinary research (e.g. Environmental geology, environmental chemistry, global climate change, biological diversity and ecosystems, environmental.

## ​Economy and IT of Telangana

The economy of Telangana is the eighth- largest state economy in India with ₹8.43 lakh crore (US$120 billion) in gross domestic product and a per capita GDP of ₹181,000 (US$2,600). The state has emerged as a major focus for robust IT software, industry and services sector. The state is also the main administrative centre to a large number of Indian defence aero-space and research labs like Bharath Dynamic limited, Defence metallurgical Research Laboratory, Defence Research and Development Organization and Defence Research and Development Laboratory.

## Cultural of Telangana

The cultural hearts of Telangana, Hyderabad, and Warangal, are noted for their wealth and renowned historical structures – Charminar, Qutb Shahi Tombs, Paigah Tombs, Falaknuma Place, Chowmahalla Place, Warangal Fort, Kakatiya Kala Thoranam, Thousand Pillar Temple, Cheruvu gattu, Pedda gattu temple and the Bhongir Fort in Yadadri Bhuvanagiri district. The historic city Goclonda during the Kakatiya reign was once known for the mines that have produced some of the world's most famous gems, including the Koh-i-Noor, Hope Diamond, Daria-i- Noor, Regent Diamond, Nassak Diamond and Noor-ul-Ain. Religious edifices like the Lakshmi Narasimha Swamy Temple in Yadadri Bhuvanagiri district, Makkah Masjid in Hyderabad, and Medak Cathedral are several of its most famous places of worship.

## Geographic Location

Telangana is situated largely in an upland region of the Deccan (peninsular India). Much of its surface area is occupied by the Telangana Plateau in the north and the Golconda Plateau in the south and is composed of gneissic rock (gneiss being a foliated rock formed within Earth’s interior under conditions of heat and pressure). The average elevation of the plateau area is about 1,600 feet (500 metres), higher in the west and southwest and sloping downward toward the east and northeast, where it meets the discontinuous line of the Eastern Ghats ranges. Drainage is dominated by the basins of the Godavari River in the north and the Krishna River in the south. As a result of erosion, the topography of the plateau region consists of graded valleys with red sandy soil and isolated hills. Black soil is also found in certain parts of the area.

Fig 1: Location map of Telangana State (Red and black Colour) in India.
Fig 2: The Administrative Boundaries of Telangana State.
Fig 3: The state of Telangana is divided into 33 districts.

The state is divided into 33 districts (Table 1.) two new districts Mulugu and Narayanpet were formed on 17 Feb 2019, which are further divided into 68 revenue divisions and they are in turn divided into 584 mandals.

The districts in the Telangana state.

## Regional Geology

The geology of the area in general comprises of granites and gneisses of Peninsular gneissic complex of Archean age. The terrain around entirely covers mainly of grey and pink granites of Archean, with plains and small mounds of Pre-Cambrian granitoides with small dolerite dykes, pegmatite and quartz intrusions of basic enclaves (Table 2.). The area possesses few outcrops, and therefore, the lithological and structural mapping has to be carried out to understand the geology of the concern basin. The Red, black and loamy soils are the prominent soil horizons in the study area. These soils are developed due to weathering of granitic and mafic rocks. Red soils are present in the dry upland areas while black and loamy soils are developed in water logged areas. The drainage in the area is dendritic type and it is controlled by undulatory topography, geographical location, physiography, climate, rainfall and drainage with a third order streams is predominant in the basin.

Groundwater in granites and gneisses occurs along the weathered and fracture zones. The maximum depth of the weathered zone is about 10-25 feet but majority of the wells that are encountered falling in the depth range of 26-35 feet. The topography characteristics are found to have extensive influence on the groundwater regime. It is found that the deeper wells are capable of sustaining daily pumping for about 4-6 hours. It is found that the position of water table is influenced not only by the rainfall but also controlled by topography, geology, structures and hydrogeological conditions. The groundwater resources can be replenished through construction of percolation tanks, judicious land management and groundwater pattern etc,. Desirable results of water/soil analysis may further decipher about the quality of water.

Geological succession.
 Period Formation Rocks Recent River and lake sedimentary deposits Clastic Sediments-sand, silt and clay Proterozoic Younger intrusives Dolerite dykes, gabbroic lenses, Pegmatites, Quartz veins, and Epidote veins Archean Peninsular Gneissic Complex (PGC) Gneisses, migmatites, Granites (pink and grey), granodoiorites tonalite and basic enclaves (amphibolites)

## Hydrogeology

Hydrometeorological information besides being important in groundwater studies plays an important role in various multipurpose projects, agriculture, irrigation, industries, aviation, shipping and fishing atmospheric processes. Jagannadhan and Dhar (1966) discussed the meteorological factors causing floods, their seasonal characteristics and also indicated basic hydrological data necessary for planning, designing and management of various hydrological aspects. Mani et al (1969) dealt with the indigenous design and manufacture of hydrometeorological equipment. Committee for Indian Hydrological Programme has been acting as a Catalyst to promote hydrometeorological studies. Krishna Rao (1971) dealt the status of work related to compilation of various agro climatological factors contributing to groundwater recharge.

Occurrence of Groundwater mainly depends on rainfall and it is the most important factor of Groundwater resource of any area. Rainfall refers to amount of Liquid Precipitation based on intensity and it is categorized into three types i.e., Light, moderate and Heavy. Precipitation is the principal and ultimate Source of Groundwater therefore; its distribution is an important aspect of Groundwater study. Hydrometeorological data delineate the presence of the Groundwater balance in an area. The most useful Hydrometeorological elements are Precipitation, Evaporation, Evapotranspiration, Humidity, Temperature, Soil moisture etc.

Krishna Rao, (1971) stressed importance of Hydrometeorological data in computing Groundwater Potentials. Subramanian, (1979) stated “study of climate is necessary to elevate water balances in an area” Hydrometeorological studies provide better understanding of groundwater resources. Hydrology of the area mainly depends on climatic conditions and geomorphic conditions.

The distribution of groundwater depends on the vertical and lateral extent of rock formations and their nature, weathering, fracturing and interconnected void spaces (Raghava Rao 1969). Though the hydrologist chiefly concerned with the groundwater, however for proper understanding of the relations between geology, distribution and occurrence of groundwater in general way all the aspects of the hydrologic cycle (fig.4) must be understood.

## Rainfall

The type, Intensity, frequency, duration and distribution of rainfall and its relation to topography play an important role in groundwater recharge of the area. The Physical, structural features of the rocks and nature of the soil also contribute to the groundwater recharge of the area. Principal source of the groundwater in the region is precipitation. Most of the precipitation in the area is from the southwest monsoon during the months of June to October. Analysis of rainfall data is an important factor of Hydrogeological study. Hydrologic cycle is the circulation of water from Ocean to atmosphere, from there to Lithosphere and Lithosphere to Ocean through complex and independent process including Precipitation, Runoff, Groundwater flow, Evaporation, and Evapotranspiration (Fig 4 & 5.). Thus, Hydrologic cycle determines water resources at all stages. The rainfall data of Bibinagar, Bhongir, Chityal, Narkatpalle, Kattangur, Nakrekal, Tipparti and Vemulapalle mandals.

Fig 4. Hydrological cycle.

## Rainfall variation

Rainfall distribution depends not only on terrain conditions but also on topography, soil profile and bed rock geology. Several investigators put their effort on precipitation and elevation relationship. Many geologists have been observed “correlation of mean seasonal precipitation with elevation, Slope, Orientation etc” finally he was concluded that 30% of variation in precipitation occurred is due to elevation difference.

Fig 5. Hydrological Budget map.

## Rain-gauge station

The number of gauges necessary to achieve a measurement of the rainfall within the selected confidence limit, can be determined by assuming that the area is meteorologically homogenous, the distribution is normal, and that there are no systematic sampling errors. According to Karanth (1987), has classified rainfall into low, moderate and heavy based on intensity of rainfall (Table 3).

Classification of Rain fall.
 S. No Type of Area Rain fall (mm/hour) 1 Light rain Rainfall < 2.5 mm/hr 2 Moderate rain Rainfall between 2.5 to 7.5 mm/hr 3 Heavy rain Rainfall >7.5 mm/hr

In Telangana some areas we are discussing rainfall example Bibinagar, Bhongir, Chityal, Narkatpalle, Kattangur and Nakrekal mandal (Tables:4 to 14) the rainfall occurs between June and October during the onset of south west monsoon. The humidity is very high and it varies between 60 and 80 % during the monsoon period. The highest rain fall would occur the months from June to September. The area receives an average annual rainfall of 900 mm from the southwest and northeast monsoon in a year. The highest precipitation generally occurs during the southwest monsoon. The intensity and amount of rainfall is unpredictable during the northeast monsoon period (October & November). The cyclonic storms that commonly originate in the Bay of Bengal and are generally affected the normal monsoon.

Table 4. Statistical data of rainfall of the Bibinagar Mandal for the period from year 1989 to 2008 (data from Central and State Groundwater Boards).
Table 5. Statistical data of rainfall of the Bhongir Mandal for the period from year 1988 to 2008 (data from Central and State Groundwater Boards).

Statistical data of rain fall of the Bibinagar and Bhongir mandals of the Telangana region for the periods from 1988 to 2008 is listed in Tables. 4 and 5 and the same data were shown in the Bar diagram or Rain fall charts (Figures.5 a to g and 6 a to f). As per the rain fall data of the area, maximum precipitation takes place during south - west monsoon especially from June to September months.

Figs.6. Bar diagram of rainfall from the Bibinagar Mandal for the periods from 1988 to 2008.

Figs.7. Bar diagram of rainfall from the Bhongir Mandal for the periods from 1988 to 2008.

Table 6. Monthly rainfall from 2000 to 2012- Chityal
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 248.3 139.2 251.3 14.8 57.6 0 0 0 0 18.4 48.5 0 778.1 2001 225 22.4 208.2 192.2 98.5 47 0 0 0 0 0 21 814.3 2002 121 14 114 10 130 0 0 0 1.8 2 0 0 392.8 2003 90.8 192.8 103.4 77.4 177 0 0 34 0 0 2 13.8 691.2 2004 87.4 92 40.3 120 105 11.2 0 4 0 18.4 0 26 504.3 2005 71 301 67.2 196.2 542 0 0 0 0 34.4 23 21.8 1256.6 2006 59.8 47.4 141 162.4 14 14 23 0 4 0 18 28.4 498 2007 117.4 41 240 171 50.4 0 0 0 0 76 2 0 697.8 2008 100 62 274 145 34 17 0 0 0 8 0 22 662 2009 57 33 139 152 53 20 0 3 0 0 13 48 518 2010 67 179.2 160 151 92 54 17 0 15 0 22 16 773.2 2011 36 168 111 10 14 15 0 2 0 0 76 8.2 440.2 2012 20 72 90.8 90.6 46.6 48.2 0 - - - - - 368.2 Total Rainfall 1233.7 1364 1940.2 1493.6 1414.1 362.2 40 43 20.8 81.2 204.5 205.2 8394.7
Table 7. Monthly rainfall from 2000 to 2012- Narkatpalle
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 276.6 133.6 225.2 26 14.4 0 0 0 0 10.8 28.4 8.4 723.4 2001 293.6 23.8 151.6 186.6 145.4 10 0 0 0 14.2 0 24.2 849.4 2002 125.8 16 143.8 21.4 216.8 2.4 0 0 0 40 0 0 566.2 2003 63.4 224 177.8 127.9 226.4 0 0 32 0 0 0 2 853.5 2004 87.4 91.6 55.4 45.2 133.2 0 0 0 8 24 0 92 536.8 2005 57 281.3 16.6 245.4 418.4 0 0 0 0 74 45 13.2 1150.9 2006 71.2 44.2 173 165 15.2 57.2 0 0 8 0 16.2 16 566 2007 192.8 84.2 153.6 206.8 76.4 12.8 0 0 0 150 29.2 0 905.8 2008 108.6 104.8 309 105.4 30 28.4 0 0 0 4.4 0 13.6 704.2 2009 80.4 38.6 120.8 262.4 51.6 48.8 0 13 0 0 0 58.2 673.8 2010 81.4 183.6 201.2 136 80.4 107 18 0 23 0 11 22 863.6 2011 32.4 32.4 81.2 3 0 5.2 0 2.8 0 0 25 10.2 289.4 2012 41.2 78 99.2 119.4 70.8 97.4 0 - - - - - 506 Total Rainfall 1511.8 1336.1 1908.4 1650.5 1209 369.2 18 47.8 39 317.4 1548 261.6 9189
Table 8. Monthly rainfall from 2000 to 2012- Kattangur.
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 147.2 60.1 182.4 25 0 0 0 0 0 12.8 8 3 438.5 2001 127.4 77 89.2 298.3 188.7 5 0 0 0 0 0 15 802.6 2002 99.8 21.8 121.1 0 100.4 0 0 0 0 20 0 0 363.1 2003 49 198.2 205.8 173.2 148.4 0 0 12.4 4 0 0 30 821 2004 59.4 173.2 45.8 85.2 174.8 2.2 0 0 2 12.2 4 2 560.8 2005 26.2 352.8 70.3 178.2 347.1 47 0 0 0 15.6 45 56.6 1138.8 2006 45.6 65.4 192.8 174.2 31.6 92.8 0 0 15.2 0 37.2 8.2 663 2007 113.4 57.2 61.4 123.4 46.2 14 0 0 12.6 34.4 11.6 0 474.2 2008 59 66.2 233.2 67.6 5 25.4 0 0 0 2.6 0 25 477.8 2009 15.8 24.2 175 85.4 52.8 67 0 26 0 0 0 27.8 474.2 2010 104.2 237.2 90 178 62.8 74.4 39.6 0 50 0 8.2 15.2 859.6 2011 45.4 183.6 188 8 0 0 0 8.2 0 0 13.2 3 449.4 2012 47.4 146 69 106.6 58 29.2 0 - - - - - 456.2 Total Rainfall 913.6 1662.9 167.6 1503.1 1215.8 357 39.6 46.6 83.8 97.6 127.2 213.6 7540.7
Table 9. Monthly rainfall from 2000 to 2012 Nakrekal.
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 324.8 102.8 254.6 21 9.4 0 3.4 0 0 5.8 0 2.4 742.2 2001 114 56 134.4 323 146.2 7.2 0 1.2 0 4.2 0 34 820.2 2002 43.8 34.2 151.8 18.4 59 0 0 0 0 5.8 5.8 0 318.8 2003 40.8 292 155 85.4 142 0 10.4 27.6 5.2 0 10.4 11.2 780 2004 74 108 44.8 67.6 150.8 0 0 0 2.4 39 0 8.2 510.4 2005 26.2 269 52 191.4 351.4 44 14.2 0 0 12 35.4 22 1017.6 2006 71.6 40.8 182 305.2 36.4 34.2 0 0 11.4 0 43.6 28.8 754 2007 81.4 60.6 109.2 162.2 46.2 4.2 0 0 10.2 150 60.4 0 684.4 2008 152.6 112.6 478.8 133.4 6.6 22.8 0 0 0 0 0 3 909.8 2009 3 31.2 207.2 162.6 68 0 0 38.6 0 0 8 30.2 548.8 2010 54.8 187.6 48 182 77.4 65.2 6.4 0 44.6 0 8.6 15 689.6 2011 32.6 219.4 183.8 24.8 0 0 0 8.4 0 1 4 11 485 2012 66 204 73.2 143.2 59.4 55 0 - - - - - 600.8 Total Rainfall 1410.4 1718.2 2074.8 1820.2 1116.4 232.6 34.4 75.8 73.8 217.8 176.2 165.8 8843.6
Table 10. Monthly rainfall from 2000 to 2012 Tipparti.
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 183 78.5 151.7 0 0 18 18 0 0 0 0 0 449.2 2001 74 16.4 110 334.3 95.4 34 0 0 0 0 20.2 9 693.3 2002 25.8 71 128.4 22 10.9 0 0 0 0 7.9 0 0 266 2003 27.1 59.2 47.8 131.4 107 0 0 44.8 0 0 0 30.4 447.7 2004 52.6 82 43 76.8 299 5.4 0 0 2 40 0 5 605.8 2005 17.5 208.6 82.8 269 384.6 0 0 0 0 12 35.4 22 1031.9 2006 71.6 47.8 131 265.2 54.2 19.6 0 0 11 0 6.4 30 636.8 2007 95.6 69.8 77.4 258.2 61 2.2 0 0 12.6 52.6 6 0 635.4 2008 64.8 79 265 112.2 15 24.6 0 0 0 3 0 0 722 2009 14.4 24.6 102.8 139.2 57.4 4 0 30.8 0 0 0 44 417.2 2010 35 172 60.6 94.4 81 92.4 30 0 12.2 0 6 16 599.6 2011 32.6 141.4 77.8 31.4 0 0 0 13 0 3.2 0 15 314.4 2012 68.2 108.2 100 114.6 32 41.4 0 - - - - - 464.4 Total Rainfall 762.2 1158.5 1378.3 1848.7 1197.5 241.6 48 88.6 37.8 58.8 74 171.4 7283.7
Table 11. Monthly rainfall from 2000 to 2012 Vemulapalle.
 Year South-West monsoon North-East monsoon Winter Summer Annual Rainfall (mm) Jun July Aug Sept Oct Nov Dec Jan Feb Mar Apr May 2000 228.2 91.6 405.4 5 9 0 20 0 0 0 13 0 772.2 2001 120.8 59 156.6 315 90.4 0 0 3 0 0 3 25 773.2 2002 34.4 64.4 133 75 36.2 0 0 0 0 18 0 0 361 2003 58 200 185.2 280 157.4 0 0 30 0 0 0 0 910.8 2004 39 234 32.2 85.6 209.2 4.2 0 0 4.2 35 0 11.4 654.8 2005 15.8 226.4 129.2 305 223.8 0 1 0 0 50 35 103 1089.2 2006 54.4 57.2 133.4 190 83.6 33.8 0 0 0 0 19 91 662 2007 98 92 183.8 176 91.4 2.6 0 0 3.2 35.6 0 0 682.4 2008 73.2 85 285.6 95.2 28.2 24.8 0 0 0 2.6 0 0 594.6 2009 14 22.2 91.6 74 63.4 7.4 0 8.2 0 4.2 0 42.6 327.6 2010 44.2 234.6 119 269 94.2 74.6 69 0 4.8 0 20 9.4 938 2011 56 197 209 48.6 0 0 0 35.2 0 0 0 2 547.8 2012 66 231.6 215 180 115.2 61.8 0 - - - - 869.6 Total Rainfall 902 179.5 227.9 2099 1202 209.2 90 76.4 12 145 89 284 9183.2
Table 12. Annual rainfall of Basin area from 2000 to 2012
 Rain gauge station Year Chityal Narkatpalle Kattangur Nakrekal Tipparti Vemulapalle 2000-01 778.1 723.4 438.5 724.2 449.2 772.2 2001-02 814.3 849.4 802.6 820.2 693.3 773.2 2002-03 392.8 566.2 363.1 318.8 266 361 2003-04 691.2 853.5 821 780 447.7 910.8 2004-05 504.3 536.8 560.8 510.4 605.8 654.8 2005-06 1256.6 1150.9 1138.8 1017.6 1031.9 1089.2 2006-07 498 566 663 754 636.8 662 2007-08 697.8 905.8 474.2 684.4 635.4 682.4 2008-09 662 704.2 477.8 909.8 563.6 594.6 2009 10 518 673.8 474.2 548.8 417.2 327.6 2010-11 773.2 863.6 859.6 689.6 599.6 938 2011-12 440.2 289.4 449.4 485 314.4 547.8 Total Annual Rainfall 8026.5 8683 7523 8242.8 6660.9 8313.6 Average 668.8 723.5 626.9 686.9 550.07 692.8
Table 13. Average annual rainfall & percentage of rainfall in mandals
 Year Chityal Narkatpalle Kattngur Nakrekal Tiipparti Vemulapalle Avg. Annual rainfall % of normal rainfall Avg. Annual rainfall % of normal rainfall Avg. Annual rainfall % of normal rainfall Avg. Annual rainfall % of normal rainfall Avg. Annual rainfall % of normal rainfall Avg. Annual rainfall % of normal rainfall 2000-01 778.1 116 723.4 100 438.5 70 724.2 105 449.2 82 772.2 111 2001-02 814.3 121 849.4 117 802.6 128 820.2 120 693.3 126 773.2 112 2002-03 392.8 59 566.2 78 363.1 58 318.8 46 266 48 361 52 2003-04 691.2 103 853.5 118 821 131 780 114 447.7 81 910.8 131 2004-05 504.3 75 536.8 74 560.8 90 510.4 74 605.8 110 654.8 95 2005-06 1256.6 188 1150.9 160 1138.8 182 1017.6 148 1031.9 188 1089.2 157 2006-07 498 75 566 78 663 106 754 110 636.8 116 662 96 2007-08 697.8 104 905.8 125 474.2 76 684.4 100 635.4 116 682.4 99 2008-09 662 99 704.2 97 477.8 77 909.8 132 563.6 102 594.6 86 2009-10 518 77 673.8 93 474.2 76 548.8 80 417.2 76 327.6 47 2010-11 773.2 116 863.6 119 859.6 137 689.6 100 599.6 109 938 135 2011-12 440.2 66 289.4 40 449.4 72 485 71 314.4 57 547.8 79 Average 668.8 723.5 626.9 686.9 550.07 692.8 Average annual rainfall in the Study area = 658.1
Table 14. Drought classification
 IMD Classification No. of Years in each Rain Gauge station % of normal Rainfall Category ChityalMandal NarkatpalleMandal KattangurMandal NakrekalMandal TippartiMandal VemulapalleMandal < 50% Severe drought 2002-03 2002-03 2009-10 50 to 75% Moderate drought 2002-03, 2004-05, 2006-07, 2011-12. 2004-05, 2011-12. 2000-01, 2002-03, 2011-12. 2004-05, 2011-12. 2011-12 2002-03 76 to 90% Slight drought 2009-10 2002-03, 2006-07. 2004-05, 2007-08, 2008-09, 2009-10. 2009-10 2000-01, 2003-04, 2009-10. 2008-09, 2011-12. 91 to 110% Normal rainfall 2003-04, 2007-08, 2008-09. 2000-01, 2008-09, 2009-19. 2006-07 2000- 01, 2006-07, 2007-08, 2010-11. 2004-05, 2008-09, 2010-11. 2004-05, 2006-07. 111 to 125% Slight Excess 2000-01, 2001-02, 2010-11. 2001-01, 2003-04, 2007-08, 2010-11. 2001-02, 2003-04. 2006-07, 2007-08. 2000-01, 2001-02. 126 to 150% Moderate Excess 2001-02, 2003-04, 2010-11. 2005-06, 2008-09. 2001-02 2003-04, 2010-11. >150% and above Large Excess 2005-06 2005-06 2005-06 2005-06 2005-06
Fig.8 Hydrographs of Chityal, Narkatpalle,
Kattangur, Nakrekal, Tipparti& Vemulapalle.

## Runoff

Runoff is one of the most important parameters in the hydrological cycle. Runoff is the water discharged through streams consisting wholly or in part of water contributed by over land flow and groundwater flow. Runoff is of two types i.e., surface runoff and sub-surface runoff. Surface runoff is that water which travel over the ground surface to the channels and rivers. The subsurface runoff is the laterally moved infiltrated water through the soil layer it enters stream channels. Runoff water includes that part of the precipitation that does not filter through the soil or is lost by evaporation, but runs over the ground surface to reach the outlet of basin. The actual runoff is equal to rainfall minus loss owing to percolation and evapo-transpirations. These losses vary greatly depending upon climatological factors such as precipitation, evaporation, transpiration and location.

The surface runoff in the catchment is mainly controlled by intensity, duration of rainfall, soil conditions, land cover and terrain slope. The land is the critical character, affecting on the hydrological response in the surface hydrologic modelling, specifically, the evapo-transpiration, infiltration, runoff and erosion, aerial distribution of precipitation, humidity and temperature of atmosphere. Geological and topographical conditions and density of precipitation has pronounced opposite effects on the surface and groundwater runoff. High permeability of ground surface, low slope and intensity of precipitation results less surface and more groundwater runoff. The compact soils will make the movement of water easy, permeable soil favours infiltration and reduces the runoff. Regardless permeability of the terrain, if the soil is fully saturated with water, infiltrations will be less and runoff is more. For these factors the amount of runoff in a given area varies from month to month and from season to season. Depending on the type of land and intensity of rainfall, runoff may be of two types i.e., immediate which is produced as soon as water hits the ground and delayed runoff which consists of water that first filters through the soil and then returns to the ground surface. A shower of intensity greater than the intensity of infiltration produces runoff with some water percolating into the ground. In the investigated area North and North-East parts comprise a hill track which is sloping towards the centre portion of the area, where runoff is relatively more than the other parts.

Runoff is a component of precipitation that appears in surface streams of either permanent or intermittent nature. Slope, drainage density, stream distribution are the influencing factors for runoff. Generally runoff is controlled by two factors.

1. Physical characteristics of the area

2. Climate

The physical characteristics are extent of the area, slope and elevation, orientation, soil type and drainage system and finally vegetation etc. The climate and geology also contribute their own share to the runoff process. Distribution of rainfall with its time and directions of stream movement and evapotranspiration. Intensity of flow, duration is one of the important climatic factors of runoff. If the rainfall intensity exceeds then the infiltration capacity will occur.

## Infiltration

Infiltration is the passage of water through the soil surface into the ground. It replenishes the soil moisture deficiency and the excess moves downward by force of gravity called percolation and builds up the groundwater table. The maximum rate at which water can enter the soil at a particular point under a given set of conditions is called infiltration capacity and it depends on many factors such as soil type, moisture content, Organic matter, Vegetative cover and season. It is of no use to the crops (except paddy) and it does not help to leach any superfluous salts out to the root zone.

The factors affecting the infiltration are the intensity and duration of rainfall. Rainfall is the main source of recharge for all groundwaters in the area, a study of its incidence, distributions both in space and time, intensity, Variability, frequency etc., is of considerable importance for the study of recharge of groundwater by rainfall. In the absence of availability of data, the effective contribution to groundwater recharge may be taken as one third of the annual rainfall taking away all the losses owing to runoff, evaporation and transpiration (Panduranga Rao, 1974). Of this quantity, perhaps some portions get absorbed in the upper layers, and is also evaporated and lost by evapotranspiration. Approximately, the percentage contribution to the groundwater can be estimated from the available volume of pore space in relation to total annual rainfall minus losses owing to runoff and evapotranspiration. Therefore, the percentage contribution may represent 10 to 15 percent of annual rainfall.

The infiltration rate limited by the transmission capacity of various layers of the soil. The properties of soil such as texture, structure, clay content, porosity and continuity of pores influence the rainfall infiltration. The effect of soil moisture is of two ways. At the beginning of rain, after day and rainfall-less period, the soil will be quite dry and cracked. When rain comes on such soils water infiltrates into the ground through pores and cracks. The rate of infiltration is high at the beginning due to the strong capillary potential created under the surface. After sometime when all the pores in the soil water zone gets filled up with water, then rate of infiltration called the “Saturation infiltration rate” is very much less than the initial infiltration rate. Water infiltrated enters into groundwater table in three stages, First infiltration of water into the soil zone, then into the zone of aeration, lastly reaching of percolated water into the saturated zone. The present study area of granitic terrain it is observed from open well and bore wells, that the area is covered with considerable thickness of soil from few centimeters to 2 meters. The subsoil of morrum (residuum) often comprises a fairly high degree of thickness varying from 10 to 15 meters. Subsoil is underline by weathered, fractured and jointed rocks up to a depth of 40 to 50 meters.

## Evapotranspiration

Evaporation and transpiration is an important factor in hydrological cycle. “Evaporation and Transpiration are closely connected to each other; no exact demarcation is possible. Under field conditions it is practically impossible to differentiate between evaporation and transpiration and both are lumped together as Evapotranspiration”. The main factors of Evapotranspiration are solar radiation intensity and duration, relative humidity, wind conditions, clouds altitude and atmospheric pressure. Estimates of evaporation from free water surface and the soil and transpiration from vegetation is of great importance in hydro-meteorological studies. The process of molecules of water at the surface of water soil acquires enough energy through sun radiation to escape the liquid and to pass into the gaseous state. Transpiration is the process by which plants loss water to the atmosphere. These two effects are considered together and known as “evapotranspiration”. Through action of evaporation, transpiration and sublimation a large amount of water is returned to the atmosphere as vapor from water surfaces and enclosed. The rate of evaporation depends on many factors such as temperature, relative humidity, wind velocity, barometric pressure and pollution of water. The rate of evaporation losses under a given set of meteorological conditions differs from one surface to another and types and stages of vegetative growth (Davis and Dewiest, 1966).

The detailed investigation of evaporation losses for various areas in the region are still lacking and exact measurement of evaporation losses is beyond the scope of the present work. The total amount of rainfall over the area as a whole based on the average rainfall per year. In the field tests for the evaporation, generally the evaporation is calculated one third of the precipitation. The evaporation is greatest on flat and barren lands and more in hot weather than in winter and also it varies with the seasons and humidity of atmosphere. Evaporation is nothing but loss of water from any region. It is a natural process from liquid state to gaseous state. About 70% of annual precipitation on the land surface of the earth returns to the atmosphere by way of Evaporation and transpiration. Evaporation and transpiration are the key for the precipitation and precipitation is the important component in Hydrologic cycle. Evaporation depends on availability of water, temperature, humidity, vegetation and wind etc.

## CLIMATE CHANGE AND DISASTERS

Climate change is “a change of climate (Fig 9.) which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods." (UNFCC)

Fig 9. Climate change scenario map.

Long term variation in global temperature, the geologic record shows a wide range of variation in global temperature (Fig 10.) on a variety of scales. Radiative forcing due to a variety of causes has been postulated for many extreme climatic events. Tertiary and Quaternary periods have experienced wide fluctuations over relatively short spans of time with overall cooling towards the present. The Quaternary is characterized by repeated continental glaciation. The Cretaceous Period was the warmest time in all of geological history (average global temperature is estimated to have been 20 degrees C).

Fig 10. Climate change Over Geologic Time scale

The world oceans, global climate drivers reliable. It is much easier to infer the globally averaged temperature than to predict the future precipitation in Berlin. Extensive measurement series are required to better understand regional climate. For many regions of the Earth, in the Southern Ocean for example, there are long time periods in the past with only a limited number of measurements. Today data are provided in these areas by satellites. Many mathematical models now exist that can help to understand the impacts of human activity on climate. As one aspect, they simulate climate response to external natural and anthropogenic forcing, but they also reveal how climate interacts with the biogeochemical cycles such as the carbon cycle. Climate research is thus developing into a more comprehensive study of the Earth system, and today’s climate models are evolving into Earth system models. This is necessary in order to study the multiple interactions. For example, the impact of global warming on the stratospheric ozone layer can only be investigated when the chemical processes in the atmosphere are taken into account. Another example is acidification of the seawater due to uptake of anthropogenic CO2 by the ocean. No one has yet been able to predict how the warming and acidification of the ocean will influence its future uptake of anthropogenic carbon dioxide, upon which the carbon dioxide levels in the atmosphere and thus the future temperature change depends. There is a mutual interaction between the ocean and the atmosphere. To a large extent the ocean determines the intensity of climate change, and its regional expression in particular. On average, warming is taking place globally. But individual regions, such as the area of the Gulf Stream, may behave in different ways. On the other hand, the ocean itself reacts to climate change. Understanding this complex interplay is a task that will take years to accomplish.

Natural Hazard “When a natural process poses a threat to human life or property; we call it a natural hazard”. Disaster “may be defines as a serious disruption of the functioning of a community or a society causing widespread human, material, economic or environmental losses which exceed the ability of the affected community or society to cope using its own resources” (Table 15.).

Disaster Risk = function (Hazard, Exposure, Vulnerability)

Disasters

1) Natural

Table 15. Classification of Natural disasters.

## Atmosphere

Volatile turbulent fluid, strong winds, Chaotic weather, clouds, water vapor feedback Transports heat, moisture, materials etc. Heat capacity equivalent to 3.2 m of ocean. In geological terms, “short-term” refers to hundreds to thousands of years, Variation in greenhouse gases accounts for some variation in global temperature (Fig 11.). Variation in incoming solar radiation also accounts for some of the global temperature change Over the past 155 years the Earth’s temperature has increased by 0.8 degrees C. Prior to 1800 temperatures were low (Fig.12) (known as the Little Ice Age).

Fig 11. Global Air Temperature map.
Fig 12. Climate change scenario map.

## Ocean

The oceans cover around 70 per cent of the Earth’s surface. They play an important role in the Earth’s climate and in global warming. One important function of the oceans is to transport heat from the tropics to higher latitudes. They respond very slowly to changes in the atmosphere. Beside heat, they take up large amounts of the carbon dioxide emitted by humankind. 70% of Earth, wet, fluid, high heat capacity Stores, moves heat, fresh water, gases, chemicals, Adds delay of 10 to 100 years to response time. The oceans cover 70.8% of the Earth’s surface (Table 16.). The oceans are wet: water vapor from the surface provides source for rainfall and thus latent heat energy to the atmosphere. The heat capacity of the atmosphere is equivalent to that of 3.5 m of ocean. The oceans slowly adjust to climate changes and can sequester heat for years. The ocean is well mixed to about 20 m depth in summer and over 100 m in winter. An overall average of 90 m would delay climate response by 6 years. Total ocean: mean depth 3800 m. Would add delay of 230 years if rapidly mixed. In reality, the response depends on rate of ventilation of water through the thermocline (vertical mixing). Estimate of delay overall is 10 to 100 years. The ocean currents redistribute heat, fresh water, and dissolved chemicals around the globe.

## Role of Land

Small heat capacity, small mass involved (conduction) Water storage varies: affects sensible vs latent fluxes, Wide variety of features, slopes, vegetation, soils, Mixture of natural and managed, Vital in carbon and water cycles, ecosystems. Heat penetration into land with annual cycle is ~2 m. Heat capacity of land is much less than water: Specific heat of land 4½ less than sea water, for moist soil maybe factor of 2, Land plays lesser role than oceans in storing heat. Consequently, the Surface air temperature changes over land are large and occur much faster than over the oceans. Heat penetration into land with annual cycle is ~2 m. Heat capacity of land is much less than water: Specific heat of land 4½ less than sea water, For moist soil maybe factor of 2, Land plays lesser role than oceans in storing heat. Consequently: Surface air temperature changes over land are large and occur much faster than over the oceans. soils, vegetation, slopes, water capacity. Land systems are highly heterogeneous and on small spatial scales. Changes in soil moisture affect disposition of heat: rise in temperature versus evaporation. Changes in land and vegetation affect climate through albedo, roughness and evapotranspiration. Land has enormous variety of features: topography, Soils, vegetation, slopes, water capacity. Land systems are highly heterogeneous and on small spatial scales. Changes in soil moisture affect disposition of heat: rise in temperature versus evaporation. Changes in land and vegetation affect climate through albedo, roughness and evapotranspiration.

## The Role of ICE

Major ice sheets, e.g., Antarctica and Greenland. Penetration of heat occurs primarily through conduction. The mass involved in changes from year to year is small but important on century time scales. Unlike land, ice melts Þ changes in sea level on longer time-scales. Ice volumes: 28,000,000 km3 water is in ice sheets, ice caps and glaciers. Most is in the Antarctic ice sheet which, if melted, would increase sea level by ~65 m, vs Greenland 7 m and the other glaciers and ice caps 0.35 m. In Arctic: sea ice ~ 3-4 m thick and Around Antarctic: ~ 1-2 m thick, Huge heat capacity, long time scales (conduction), High albedo: ice-albedo feedback Fresh water, changes sea level, Antarctica 65 m (WAIS 4-6m), Greenland,7m, other glaciers 0.35m.

## The Role of the Atmosphere in Energy

The atmosphere is the most volatile component of climate system, Winds in jet streams exceed 100 mph or even 200 mph; winds move energy around. Thin envelope around planet 90% within 10 miles of surface 1/400th of the radius of Earth; clouds appear to hug the surface from space. The atmosphere does not have much heat capacity. “Weather” occurs in troposphere (lowest part) Weather systems: cyclones, anticyclones, cold and warm fronts tropical storms/hurricanes move heat around: mostly upwards and pole wards.

 S. No. Parameters Area 1 Total water on earth 1,360,000,000 km3 2 Oceans and Seas 1,331,746,800 km3 3 Glaciers and Ice Sheets 24,000,000 km3 4 Groundwater 4,000,000 km3 5 Lakes and Reservoirs 155,000 km3 6 Soil Moisture 83,000 km3 7 Vapor in the atmosphere 14,000 km3 8 Rivers 1,200 km3
Note
Table 16. The Water budget globe.
Fig 13a. Disaster map of Drought
Fig 13b. Disaster map of Tropical cyclones
Fig 13c. Disaster map of GLOF (Glacial Lake Outburst Flooding)
Fig 13d. Disaster map of Floods

## FLUORIDE

The Agriculture and domestic purposes In Chinnaeru River Basin, Nalgonda District, Telangana State. The problem is raised on water quality for human beings, International and National scientific organization like World Health Organization (WHO), Central Groundwater Board (CGWB) raised problem (Reddy A G S et al., 2010) and (WHO 1984, 1996 & 2004), Nalgonda District is one of the poorest and most drought-prone districts of Telangana State in Southern India. The area has been associated with high groundwater pollution (fluoride) concentrations which have been reported to reach up to 10 mg/l (Ram Mohan, et al., 1993). Thousands of inhabitants suffering from paralysis bone diseases, deformities of vertebrae, hands and legs, deformed teeth, blindness and other conditions are common manifestations of this natural hazard in the district. The first fluorosis problem in Nalgonda district was reported (Siddiqui, 1968). There is an urgent need to make professional and scientific assessment of degree of soil and groundwater contamination, define the sources of contamination, the impact on the human health and specify remedial measures. Therefore, the study will help to understand the processes acting in the study area and the controlling factors. It will also help to access the level of contamination and to mitigate the existing problem. The details of this research study will also create awareness among the common public as to how to overcome the problems associated with fluoride, groundwater, soil pollution and remediation of the contaminated sites due to industrial activities, agriculture and urbanization. The primary objective of the study is to ascertain whether groundwater quality is controlled by Municipal wastage (anthropogenic) or litho types (rocks) or both. The study will help to identify the problems and potential of the area to generate a water resource database for overall development on a sustainable basis. In this regard harvesting of water resource judiciously in a smaller hydrological unit has the prime importance. Thus, the right mix of technology and traditional wisdom would be a winning combination, a plan that integrate- mega projects with micro efforts like rain harvesting and watershed management many give scientific solution for the development of backward areas. National and International levelThe groundwater/surface water, not only with similar chemical composition or ionic make up but also within the watershed or sub-basin, has different degree of fluoride concentration; the reasons for this discreet fluoride absorption could be delineated by attempting a comprehensive study of analytic results, which may open up new ideas for understanding more clearly the water-rock interaction contact chemistry. The geochemistry of groundwater has evaluated in Viappar river basin, Tamil Nadu, by adopting various methods like Gibbs plots, Kelley’s index, chloroalkali indices (CAI) and concluded host rock as the main source of dissolved solids in the groundwater (Pandian & Shankar, 2007). The Nalgonda district in South India is well known for high concentration of fluoride in groundwater (Ram Mohan, 1991). (Reddy A G S et al., 2010) Prevalence of fluorosis disease is rampant among majority of rural habitations of the district where groundwater is the only source for drinking and irrigation requirements. International The study has been carried out with the objective to find out the causes of pollution and its impact on human society. Vicinity of many agricultural zones leads to high level of metal toxicity that is derived from the poorly treated wastages on the open land. The study was under taken on Water Quality. Determine the extent and distribution of Fluoride, Nitrates etc., to delineate the source as geogenic or anthropogenic. Fluoride in drinking water has now become one of the most important geo-environmental and toxicological issues in the world. Fluoride has considerable physiological importance for man and animals.

The major health problems caused by fluoride are teeth mottling, skeletal fluorosis, thyroxine changes, kidney damage and deformation of bones in children as well as adults (Grandjean, et al., 1992; Handa, 1988; Jain, et al., 1999; Kundu, et al., 2001; Saxena & Ahmed, 2001; Subba Rao, 2003; Subba Rao, et al., 1998a, 1998b) due to ingestion of high fluoride concentration drinking water for a long-term are well known diseases. Highfluoride in groundwater and surface water have been reported from many parts of the world, particularly in arid and semi-arid areas of India, China, Sri Lanka, Spain, Mexico and many countries in Africa, Western USA and South America (Abu Rukah & Alsokhny, 2004; Ayoob & Gupta, 2006).

The scope of the present study encompasses zones of pollutants to areas of the basin and compares the basin results of the area with those of adjacent basin for regional outlook on groundwater quality, availability and distribution.

## Land Use and Land Cover

Fig14. Land use and land cover
Map of Telangana state.
Fig15.  Soil Resource Map
of Telangana state.
Fig 16.  Elevation with Contour Map of Telangana state
Fig 17.  Groundwater Prospects Map of Telangana state
Fig 18.  Telangana State Satellite Imagery.

## GEOMORPHOLOGY

Geomorphology has been characterized as the earth shape science, which is concerned with the form of the earth. During recent past the application of geomorphologic studies has been carried out much significance both in exploration of groundwater and mineral resources. For proper assessment of both surface as well as groundwater resources it is widely acknowledged that catchment approach gives the best results as in most cases the surface water basin groundwater basin are concurrent. Morphometry is the measurement and mathematical analysis of the configuration of the earth’s surface, shape and dimensions of its landforms (Chorley, 1953). Evaluation of the characteristics of the drainage network of a basin using quantitative morphometric analysis can give information about the hydrological nature of the rocks exposed within the drainage basin. A drainage map of a basin provides a reliable index of the permeability of the rocks and also gives an indication of yield of a basin. The geometry of a basin plays an important role in evolving quantitative parameters like, linear, areal and relief aspects of a basin.

The quantitative geomorphic methods involve means of measuring size and properties of drainage basin. According to Strahler (1952), the two general classes are: 1. Linear Scale measurements 2. Dimensionless measurements. The descriptive study of a basin involves all those process that in one way or other cause changes in the earth features. From hydrologic point of view the most important of these processes in river erosion which could be considered as having two phases namely, removal of rock and rock accumulation.

Fig 18:  Geomorphology map of Rangareddy District.

## Land Use and Land Cover

Fig 19:  Land use and Land cover map of Rangareddy District.

## SUMMARY AND CONCLUSIONS

1.     The Telangana region State it covers an area of 1,12,077 sq.km, and falls in the Toposheet No.56.

2.     The lithology of area is mainly made-up of granitic rocks (grey and pink granites, granite migmatite gneisses) of the granite-granodiorite-tonalite (GGT) in composition.

3.     The area belongs to a part of Eastern Dharwar craton of Pre-Cambrian age and is tectonically uplifted and deformed during Neo-Proterozoic period by the younger tecto no-thermal activity in the form of wide spread dolerite dyke swarms, younger granitoids, granulites and gabbroic rocks with widespread fracture system.

4.     Field and petrographic studies of the rocks suggest that they are metamorphosed and deformed at upper amphibolites facies conditions.

5.     The study area comes under semi-arid region and the average rainfall of the study area is 658.1mm/annum. The study area receives maximum rainfall in South - West monsoon period i.e., 70 %. The type, intensity, frequency, duration and distribution of rainfall and its relation to topography play an important role in groundwater recharge of the area. Most of the precipitation in the area is from the southwest monsoon during the months of June to October.

6.     The study of the drainage pattern and geomorphology of the research area the following conclusions can be drawn, Drainage pattern observed in the area is of dendritic to sub dendritic type, which is a characteristic of the granitic terrain. Most of the channels drained themselves into Musi River which is a major surface resource. The drainage pattern in the Telangana region is dendritic to sub-dendritic type. Its dendrite pattern is the characteristic feature in the granite terrain. In this pattern, the tributary streams come from all directions to meet main rivers. The drainage pattern in the area is well integrated, five to coarse textured and well oriented at places.

7.     The analysis of drainage pattern in the study area reveals the structure of drainage as dendritic to sub-dendritic. The basin has a stream frequency of 1.2 and it helps in distinguishing the groundwater recharge characteristics in the river basin.

8.     The Fluoride (F-) concentration varies from 0.4 -2.9 mg/l and 0.6-3.6 mg/l in groundwater during pre-and post-monsoons in some samples of Telangana region respectively. The fluoride content shows a little seasonal fluctuation from pre- to post-monsoon periods. It seems that it is relatively higher in post-monsoon period when compared to the pre-monsoon. 61% groundwater samples in pre-monsoon and 57% groundwater samples in post-monsoon have < 1.5 ppm and therefore these groundwater samples are good for human beings. However, a few groundwater samples contain > 1.5 ppm fluoride at Nymathpalli (3.6), Nagireddypalli (3.3), Bollepalli (3.3) in the south and Pagidipalli (2.7) in the north of the basin. The average F- content (1.61) in the study area is far less than that of wailapalli in Nalgonda district (Sugreeva reddy et al., 2010) where people are affected by fluorosis due to high fluoride content (avg.2.96).

9.     The water–rock interaction and evapo–transpiration and atmospheric precipitation and arid to semi–arid climatic conditions are played major role in the in groundwater of Fluoride concentration. Due to invasion of Musi river floods which carries lot of organic material and human waste of the Hyderabad city.

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## ACKNOWLEDGEMENTS

It gives me a great pleasure to complete my research work under the supervision of Prof. A.L. Ramanathan, School of Environmental science, Jawaharlal Nehru University, New Delhi. I am extremely grateful to Prof. A.L. Ramanathan for his valuable guidance, constant encouragement and useful discussion, and is particularly indebted to him for a critical review of the manuscript.

Working in the field and laboratory would not have been possible without the cooperation of Shyam Ranjan, and Mr. Naveeen, to whom I am thankful, highly thank ful.

I am grateful to Honrable Vice-Chancellor, Professor. Khaja Althaf Hussain, Registrar, professor. M. Yadhagiri, Principal, Upender Reddy, University College of Science and Informatic, Mahathma Gandhi University, Nalgonda, for their help to get this opportunity.

I express my thanks to Director, Chairman of IAS, INSA and NAS and Mr C S Ravikumar, Coordinator of Science education Programme, Indian Academy of Sciences, Bengaluru, for providing this opportunity of Summer Research Fellowship Programme.

Thanks are due to my research colleagues and senior research fellows in the School of Environmental science, Jawaharlal Nehru University, New Delhi, for their support and best wishes.

Last but not the least I would like to express my deep sense of gratitude to my parents and sisters, for providing encouragement and motivation during my summer research fellowship work.

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