The Indian Institute of Technology Guwahati (IIT-G) has raised concerns over potential groundwater risks linked to the proposed Kamakhya access corridor project and advised strict restrictions on foundation depth to safeguard the fragile hydro-geological system of the Nilachal Hills.
In its hydro-geophysical assessment, IIT-G cautioned that construction activities must avoid disturbing fracture-controlled groundwater pathways beneath the hill. The institute recommended that foundation depth in most parts of the project should not exceed 6.4 metres. However, more stringent limits have been suggested in sensitive stretches—up to 1.9 metres between the Kamakhya Temple and Chinnamasta Temple, and up to 3.9 metres near Siddheshwar Temple or up to the nearest fracture, whichever is shallower.
The study noted that the subsurface in the project zone comprises layers of soil-fill over weathered and hard rock, with fractures detected at depths of around 6.4 to 7.6 metres. Any deep excavation beyond the recommended limits could disrupt the natural groundwater flow system, the institute warned.
Following the expert recommendations, project consultants have reportedly revised structural drawings to ensure compliance with the prescribed depth caps. The state Public Works Department informed the court that most of the planned facilities are being positioned over already compacted or previously built-up areas to minimise fresh ground disturbance.
The corridor project, estimated at around ₹500 crore, aims to improve pilgrim movement and infrastructure leading to the historic Kamakhya shrine atop Nilachal Hills, which attracts lakhs of devotees every year.
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