River Water Quality
   
Parameter Class (A) Norms Subarnarekha Kharkai
02-03 03-04 02-03 03-04
Cd 0.01 mg/l NT NT NT NT
Cr +6 0.5 mg/l 0.016 0.006 0.017 0.008
Total Chromium - 0.026 0.021 0.033 0.024
Cu 1.50 mg/l 0.07 0.025 0.025 0.025
Fe 0.30 mg/l 0.23 0.17 0.025 0.190
Zn 15 mg/l 0.145 0.125 0.245 0.165
Ni NA 0.095 0.05 0.370 0.025
Mn 0.50 mg/l 0.02 0.015 0.04 0.005
NO3 (N) 20 mg/l 0.46 1.07 1.95 0.580
Pb 0.10 mg/l 0.035 0.02 0.03 0.005
pH 6.5 – 8.5 8.2 7.5 8.2 7.6
Total Hardness 300 mg/l 90 89 122 104
DO 6 mg/l 4.0 4.5 3.3 4.7
TSS NA 76.0 5.7 44 54
BOD3 2 mg/l 4.5 3.5 5.0 2.5

NA - Not Applicable : NT - No Trace

Studies have also been carried out to study the Dimna Lake stratification and eutrophication. No stratification was observed in the Lake as indicated by no changes in Dissolved Oxygen (DO) levels at different depth. The company does not use any ground water source for either industrial or domestic use at Jamshedpur.

EN21 IMPACT ON RENEWABLE WATER RESERVE

The flow of river water after 500 meters from the confluence of Rivers Subarnarekha & Kharkai (water abstraction point) at Jamshedpur is shown in the box.

At Jharia the water is withdrawn from rivers Damodar & Katri and at West Bokaro from a seasonal nallah. The groundwater from the underground Mines and wastewater from coal washeries is used after treatment for industrial and domestic purposes at both locations.

At Mines & Quarries the water is drawn from different sources as shown in the box and the flow in pre-monsoon is 51246 m3/hr for Baitarni River, 455 m3/hr for Jojo nalla and 29277 m3/hr for Kundra nallah.

EN22 RECYCLING & REUSE OF WATER

Gross make up water requirement for Steel Works was 78,400 cum/day (avg) during the reporting period. Approx. 900,000 cum/day of water remains in circulation in steel manufacturing processes through close circuit system and Cooling Ponds. The make up water represents primary evaporation, seepage and blow down losses. The make up water consumption at different units are presented in EN5.
   Post Monsoon Winter Summer
River flows at Jsr. 9.40 cum/sec 4.50 cum/sec 5.93 cum/sec
Water pick up 2.78 cum/sec 2.666 2.76
% age 29.6 59.1 46.5

Water Abstraction from River Subarnarekha.

Source: Regional Environmental Impact Assessment Study Report for Jamshedpur Region by NEERI, Nagpur- May 1995.

Water Sources at Mines
   
Name of Mine Water Source Purpose Remarks
Noamundi Baitarni
River
 
Jojo Nalla		 Industrial
 
 
Domestic		 Source is about 20 km away from Mines.
Source is about 3 km away from Mines.
Joda Kundra
Nalla		 Industrial & Domestic Source is about 5 km away from Mines.
Gomardih Nakati
Nalla 
 
Ground
water
Domestic
 
 
Industrial		 Source is about 5 km away from Mines.
Ground water is available in the active mining area.
Jharia Damodar
River		 Industrial &
Domestic		 One km from site.
Sukinda Mines
Drainage		 -do- Mines drainage treated and used.
West Bokaro Mines drainage
+ Raw River		 -do- Water is treated before use.

 
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