The Bombay Sewage Disposal Project was conceived as a major intervention to improve wastewater disposal for Mumbai, building on earlier Sewage initiatives. Increasing sewage volumes and growing environmental concerns in coastal waters required enhanced treatment and disposal systems to protect public health and marine ecosystems. The project included deep underground conveyance and marine disposal infrastructure to transport treated wastewater away from the shoreline, which comprised large pumping stations, underground tunnels and marine outfalls designed for reliable operation under challenging subsurface and marine conditions.

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