Completed Project : Preparation of Ground Water Quality Map under Rajiv Gandhi National Drinking Water Mission Phase IV in Karnataka

Preparation of Ground Water Quality Map under Rajiv Gandhi National Drinking Water Mission Phase IV in Karnataka

National Remote Sensing Centre (NRSC), ISRO, Govt. of India, in collaboration with partner institutions is preparing ground water quality maps using remote sensing and GIS technology under Rajiv Gandhi National Drinking Water Mission (RGNDWM) project. The project is being sponsored by the Department of Drinking Water Supply (DDWS), Ministry of Rural Development (MoRD). The KSRSAC has been entrusted with the work pertaining to the State of Karnataka


Objectives

The objective of ground water quality mapping is to create a spatial database on ground water quality using mainly the existing point data available with DDWS, MoRD. The output spatial data is to be in the form of an additional layer showing the spatial distribution of the quality of ground water. The ground water quality information is to be provided in terms of its suitability for human consumption, i.e.1) potable, 2) permissible and 3) non-potable as per the norms of the Bureau of Indian Standards (BIS).


Chemical parameters considered for mapping

There are many dissolved minerals and organic constituents present in ground water in various concentrations. Among them, the most common elements are pH, Total Hardness, Iron, Nitrate and Fluoride and the same are considered for mapping and analysis. Table 1 shows the threshold values used for classifying concentration of the elements as per BIS Specifications of 2003.


Table 1 Classification of chemical parameters as per BIS specifications


Sl. No. Chemical parameters Desirable Permissible Non-potable
1 pH 6.5 to 8.5 No Relaxation <6.5 & >8.5
2 Total Hardness CaCO3 (mg/l) <300 300 to 600 >600
3 Nitrate NO3 (mg/l) <45 No Relaxation >45
4 Fluoride - F(mg/l) <1.0 1.0 to 1.5 >1.5
5 Total Iron Fe (mg/l) <0.3 0.3 to 1.0 >1.0

Summary Of Work


As for pH, Belgaum and Shimoga districts are more affected; for Total Hardness Tumkur, Mandya and Belgaum districts; for Nitrates Mandya, Kolar and Davanagere districts and for Fluorides Chikkaballapur, Tumkur and Bellary districts are affected. The number of affected villages for various parameters of ground water in different districts is presented in Table 2.


Table 2 Number of problem villages in different districts in respect of chemical parameters


sl.no District Total no of villages selected No of problem villages
pH Total hardness Iron Nitrate Fluoride
1 Bagalkote 989 126 197 4 53 65
2 Bangalore Urban 1089 39 199 82 399 29
3 Bangalore Rural 944 16 103 8 118 18
4 Belgaum 1638 185 544 204 89 95
5 Bellary 1228 19 159 5 183 489
6 Chamarajanagar 1422 6 298 10 11 1
7 Chikballapur 1875 81 201 30 232 689
8 Chikmagalur 2150 219 118 22 12 16
9 Chitradurga 1260 28 248 15 103 360
10 Dakshina Kannada 1008 60 5 14 1 21
11 Davanagere 1317 119 461 13 442 272
12 Dharwad 506 34 62 2 47 3
13 Gadag 595 3 208 3 38 80
14 Hassan 2296 186 87 84 17 11
15 Haveri 1190 1 263 15 5 6
16 Kodagu 450 43 0 45 1 0
17 Kolar 1624 0 401 7 647 289
18 Koppal 738 49 153 81 133 100
19 Mandya 2057 14 688 269 767 244
20 Mysore 2449 1 298 30 114 20
21 Shimoga 1774 516 97 59 16 11
22 Tumkur 4294 41 704 298 359 689
23 Udupi 660 0 1 3 0 1