Page 1 of 12 Project Interim Report Hydrological and ecological impact of mining in and around Mahan River Sponsor South Eastern Coalfields Limited (SECL) Bilaspur, Chhatisgarh-495006 CSIR-National Environmental Engineering Research Institute Nehru Marg, Nagpur 440020 July 21, 2017
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Page 1 of 12
Project Interim Report
Hydrological and ecological impact of mining in and around
Mahan River
Sponsor
South Eastern Coalfields Limited (SECL)
Bilaspur, Chhatisgarh-495006
CSIR-National Environmental Engineering Research Institute
Nehru Marg, Nagpur 440020
July 21, 2017
Page 2 of 12
1.0 Origin of the Proposal and Problem Definition:
South Eastern Coalfields Limited has several coal mines in the area of Mahan River Valley.
The coal mining activity leads to several interferences with surface and sub-surface water
resources such as removal of mine water, disposal/use of mine water, storage of
storm/rainwater into the abandon mines etc. Therefore it would be required to undertake a
study for assessment of surface and sub-surface water regime in the coal mine project areas.
The impact of the mining activity on the ground and surface water may reach beyond the
mine activity area. However, the scope of the present study is restricted to study of water
regime in the sub-watershed surrounding the working minesand proposed mines of SECL in
Mahan River Valley.
The report details the present status of the work wherein the data received from the SECL are
mentioned. Besides, the primary data collected during the field visit are also presented.
2.0 Objectives of the Study
Preparation of study area maps with details of mine locations and drainage pattern.
Assessment of hydrogeological characteristics of the study area to establish the depth
to water (DTW) table and ground water development potential and current status of
GW development.
Assessment of impact of dewatering of mines on the water levels of the surrounding
wells or other water bodies, particularly the effects during summer season.
Impact assessment of seepage on water levels of the surrounding wells.
Analysis of river flow data for past ten years at various gauge stations in the study
area.
Analysis of water quality data for past ten years at various monitoring stations in the
study area.
Remote sensing images analysis of river catchment area to delineate spatial-temporal
variation in past ten years.
Water quality modelling to assess the impact of significant pollution parameter in the
river (provided river hydrodynamics, river width, depth profile and velocity/flow is
available).
Study on the effect of pumping out of the water from mines in terms of the ground
water levels and any pollution causing to surface/subsurface water bodies w.r.t to
quality of water pumped out from mines.
Page 3 of 12
Comparison of hydro-chemical aspects and water quality parameters for mine-water,
surface well water and borewell water in the study area.
Estimating the water budget of the mine area including drought patterns, annual flows
in the rivers and streams, water quality, existing water wells etc, through available
records. The proposed water management planning to be delineated.
Environmental base line to be established with respect to current period.
3.0 Scope of the project:
The entire study will be restricted to sub-watershedof Mahan River valley
The study by CSIR-NEERI will be based on secondary data
Any primary data collected in addition to the available secondary data is not
included in the scope of the study and will be generated separately by SECL if
required.
4.0 Study area
The study area is covered in the Survey of India toposheet No 64 M/3 (scale 1:50,000).
The study area has total existing 7 active mines namely Mahan (OCM), Mahan-II (OCM),