The Union government has relaxed the rules governing construction along the Ganga flood plain, opening the door for building projects in areas that experience only moderate or rare flooding.
This has been done through a gazette notification issued on 10 August 2025 by the National Mission for Clean Ganga (NMCG), which functions under the Jal Shakti Ministry. The notification amends the River Ganga (Rejuvenation, Protection and Management) Authorities Order, 2016.
The 2016 order had defined the Ganga flood plain as the area on either side of the river that gets submerged during the greatest flow, or a once-in-a-hundred-years flood.
It carried a strong protective clause stating that the bank of the Ganga and its flood plain would be a "construction-free zone" — the stated purpose being to reduce pollution and preserve the natural groundwater recharge function of the land.
There was also a separate ban on construction in the "active flood plain", but the order never actually defined what "active" meant — creating a legal inconsistency.
The blanket ban is gone. In its place, an approval-based system has been introduced — meaning you can now build, provided you obtain the required clearances.
Earlier, there was a single definition (everything within the 100-year flood line was treated as flood plain). Now it has been broken down into three layers:
Active flood plain — the stretch immediately alongside the river channel that submerges at least once every 5 years. Strict construction ban remains here, with minor exceptions for temporary set-ups like religious events.
Regulatory zone — the middle belt, subject to moderate flooding once every 5 to 25 years. Construction now permitted with clearances.
Warning zone — the outer periphery, which floods only during severe 25 to 100-year events. Construction now permitted with clearances.
Earlier, the entire 100-year flood zone was protected as a construction-free area.
Now, only the innermost 5-year core (the active flood plain) remains strictly protected. The other two zones — regulatory and warning — are open to construction, provided official clearances are obtained.
In short: the protective boundary has effectively shrunk from a 100-year flood line to a 5-year flood line, with everything be
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