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(22_44¢N,86_20¢E) and (4) Galudih, Station D (22_40¢N, 86_25¢E).Station A is situated
upstream on river Subernarekha,about 15 km from the industrial city of Jamshedpur and just
touching the southern demarcation line of the basic igneous rock layer. Station B, before river
Kharkhai meets with river Subernarekha, is also upstream at a distance of 5 km. Similarly,
stations C and D are situated downstream and at a distance of 5 and 15 km,respectively, after
the city of Jamshedpur. A small seasonalrivulet, the Gurmanala creek, joins river
Subernarekha between stations C and D.
Figure 1. A map of the study area showing the different sampling stations
To determine the WQI, the following six water quality parameters are measured:
pH: The pH level is a measure of the acid content of the water. Most forms of aquatic life
tend to be very sensitive to pH. Since most of the human body consists of (5060%)
water,
the pH level has profound effect on all body chemistry, health and disease.