Geospatial Analysis of Fluoride Contamination in Groundwater of Southeastern Part of Anantapur District, Andhra Pradesh - Management of Natural Resources in a Changing Environment - page 61

77 20'0'E 77 30'0'E 77 40'0'E 77 50'0'E 78 0'0'E 78 10'0'E

N

14 0'0'N

14 0'0'N

W E

S

13 0'0'N

13 0'0'N

SCALE 1: 253440
0

Meters 5

5 10 5

Kilometers

77 20'0'E 77 30'0'E 77 40'0'E 77 50'0'E 78 0'0'E 78 10'0'E

Fig. 3 Drainage map of the study area

depth of open wells range from 6.0 to 25.0 m below ground level and depth to water
level vary from 1.5 to 23 m bgl. The yield of dug wells varies 10-200 cm/day for a
pumping period of 3-6 h/day. The drainage map of the study area is shown in Fig. 3 .

Materials and Methods

In the present study, water samples were collected from 50 tube wells in the study area.
The study is carried out with the help of topographic maps, Garmin GPS MAP 76, Arc
GIS 9.3 corroborating with fieldwork. The Survey of India toposheets are used to pre-
pare the basemap, drainage map and to understand the general nature of the study area.