Patna Flood-Prone Areas: Check a Plot for Flood, Buffer, Earthquake

How to check a plot for flooding and waterlogging

After the 2019 floods, many in Patna learnt that the level of the land matters as much as the address. Check these seven things:

1. Visit during or just after the monsoon: every plot looks fine in the dry season.
2. Ask the neighbours: how many days did water stand here in 2019? How high does it rise every year?
3. Check the level: is the plot below the road? How high have nearby houses raised their plinths? Very high plinths and earth filling are themselves a signal.
4. Find where the drain goes: which nala or pumping station takes the locality's water, and does it work?
5. Distances on the map: from the river, canal, pyne or embankment, and the master plan zone (buffer, conservation). Look for watercourses near the plot on Bhu-Naksha.
6. Distance from the landfill and STPs, and a groundwater (arsenic) test.
7. Budget for filling: earth filling and a higher plinth on a low plot are part of your cost.

Papers and other checks for a plot: plot buying guide for Patna. The master plan in simple terms: Patna Master Plan 2031 explained.

Patna's waterlogging areas: what the master plan says

The master plan report (2016) lists these drainage gaps (pages 103–104):

Note: this was the 2016 position. Drains and pumping stations have been built in many places since. So don't label a locality "bad" or "good" from this list alone. It tells you where to check more carefully.

Punpun, Naubatpur and Fatuha: buying a plot in Bihta, Naubatpur, Fatuha or Punpun.

Plot near a river or canal: how far away can you build?

Shown a "cheap plot by the river"? Check its master plan zone first. Full green belt and conservation zone rules: can you build in Patna's green belt?

Plot near the landfill site: Ramachak-Bairiya

• The master plan's proposed landfill: Sampatchak block, Ramachak-Bairiya, plot no. 118, 80.5 acres, acquired by the state government for a solid waste processing complex (page 107).
• Guidelines (report Annexure 17, page 211): a landfill should be at least 500 m from habitation, and once the site is finalised, a 500 m belt around its boundary should be declared a "no development zone".

Annexure 17 is a technical note. Confirm with the municipal corporation or circle office whether a specific plot is restricted. Still, before buying near Bairiya, judge the smell, the waste-truck routes and the groundwater yourself.

Patna is in seismic zone IV: what does that mean?

• Per the master plan (pages 16, 27–28), Patna lies in seismic zone IV (high risk), so earthquake-resistant buildings are required.
• Per the Government of India's parliamentary reply of 1 April 2026 (PIB), the seismic zoning map in BIS IS 1893 (Part 1):2016 remains the current standard; the revised zonation was withdrawn in March 2026.

Building? Have a qualified structural engineer design the house to the earthquake-resistant codes. Buying a flat? Ask the builder which standard the structure follows and who approved the plan: flat buying checklist for Patna.

What should you do? (our advice)

• Look at the water before the price: a cheap low plot becomes expensive after filling.
• Near a river, canal or embankment, don't pay a token before checking the master plan zone.
• See the plot a second time after the rains, and ask the neighbours about 2019.
• Make the house earthquake-resistant; it is safety, not an extra.

Patna floods and plots: frequently asked questions

1. What are the risks of buying land near Punpun?

   Per the master plan, the Punpun causes heavy floods in the east, and when the Ganga is high, water backs up through it. The Draft Plan 2047 says the 2019 flooding was concentrated in the township's eastern part, where ground is lower. Many Punpun villages are also in the Patliputra township, where construction is barred until 30.03.2027.

2. What is the highest flood level recorded around Patna's township area?

   About 53.91 m above mean sea level, in 1976, per the Draft Plan 2047. Ask how your plot's level compares.

3. Can any house be built in the river conservation zone?

   Plotted housing is prohibited there. There are only limited exceptions, such as dwellings for people working the farm.

4. Is there arsenic in Patna's groundwater?

   The master plan report flags arsenic in the second layer of groundwater in areas around the landfill site (page 95). Get bore-well water tested before you buy.

5. Will new drains end waterlogging?

   The plan proposes new storm-water canals in the middle of the 80 m road and along some 60 m and 45 m roads (page 104). Until they are built, judge each plot on site.

Written on 24 October 2026. Sources: the Patna Master Plan 2031 report and its DCR, the Patliputra township Draft Development Plan 2047, and the parliamentary reply of 1 April 2026 published by PIB. The waterlogging list is from the 2016 report; conditions on the ground may have changed.