East Bengaluru buyer answers
Flood risk on Sarjapur Road and the ORR: how do I check a flat before buying?
Direct answer: Sarjapur Road flooding is patchy, so check the flat, not the area. On Sarjapur Road or the outer ring road, look at four things: flood spots on the approach road, the distance to the nearest drain or lake, how high the basement ramp sits above the road, and what residents saw last monsoon.
Disclosure: acre&key’s advice is free to buyers.
Verify with your lawyer: This is general information, not legal advice. Whether a building respects a drain or lake buffer is a question for a surveyor and a property lawyer.
Key takeaways
- The official list is of points, not buildings. In April 2026 the East corporation had 20 of the city's 101 listed flood-prone locations (news).
- Panathur 'S' Cross and Silk Board were among the points named in the 2026 pre-monsoon circular (news).
- Drain buffers are 50 m, 25 m and 15 m for primary, secondary and tertiary drains under RMP-2015, as cited by the Supreme Court.
- The outer stretch isn't on the city list at all. Anekal taluk sits outside the GBA corporations.
- Our GATE check: ground level, approach road, things nearby, evidence.
Sarjapur Road and the ORR between Marathahalli and Silk Board are where flood clips often come from each monsoon. That doesn't mean every building floods. It means you need to check the specific flat rather than the area's reputation. This page gives you the order to do it in.
What does the official data cover on these roads?
The city's flood data is a list of vulnerable points. As of April 2026, the five GBA corporations had 101 flood-prone locations, 20 of them in the East, and 52 citywide were still unfixed (The New Indian Express, 11 Apr 2026, news). The GBA's circular named Panathur 'S' Cross and Silk Board among the points flagged (The Hindu, news).
You can see vulnerable spots on the state's Varunamitra map. It shows points on roads and junctions. It won't tell you whether one basement takes in water.
Once you cross into Anekal taluk on outer Sarjapur Road, the city list stops. Our flood exposure index found 603 K-RERA approvals in Anekal from 2020 to mid-October 2026, in a taluk an IISc-led study rated as having a large high-hazard share. For those sites, the checks below matter more, not less.
The GATE check (our framework)
| Letter | Question | Where to look | Warning sign |
|---|---|---|---|
| Ground level | Is the basement ramp or stilt floor higher than the road outside? | Measure on site; the approved section drawing | Ramp crest at or below road level |
| Approach road | Is there a vulnerable spot on your daily route? | Varunamitra map; news for the last two monsoons | A single route through a listed junction |
| Things nearby | How far is the nearest lake boundary or drain? | Approved plan; village survey maps | Inside the buffer for that drain or lake |
| Evidence | What happened last monsoon? | Residents; association minutes; a visit after rain | Basement pumping, water marks, "it clears in a day" |
How far should a flat be from a drain?
The Supreme Court's judgment of 5 Mar 2019 referred to the RMP-2015 buffers: 50 m from primary drains (rajakaluves), 25 m from secondary drains and 15 m from tertiary drains (judgment). Lakes follow a separate, size-based buffer since 18 Feb 2026 (Act 19 of 2026), from 0 m to 30 m.
Worked example 1: which buffer applies? A tower's nearest wall is 22 m from a drain.
| If the drain is | Buffer | Gap | Result |
|---|---|---|---|
| Primary | 50 m | 22 − 50 = −28 m | Inside the buffer by 28 m |
| Secondary | 25 m | 22 − 25 = −3 m | Inside by 3 m |
| Tertiary | 15 m | 22 − 15 = +7 m | Clear by 7 m |
So the first question is never "how close is the drain?" It's "what kind of drain is it?" The drain's classification and the measurement point should be on the approved plan. If they aren't, ask a surveyor. Our lake and rajakaluve checks cover the survey maps to pull.
Why does ramp height matter so much?
Most flats don't flood. Basements, ground-floor units and approach roads do. A basement ramp that sits barely above the road is where water gets in.
Worked example 2: the ramp margin. Say residents tell you water on the road outside reached about 30 cm last monsoon. You measure the ramp crest at 15 cm above the road.
- Margin: 15 − 30 = −15 cm
- The ramp would have been overtopped by about 15 cm
If the crest were 45 cm above the road, the margin would be 45 − 30 = +15 cm. These figures are illustrative; the 30 cm is what you'd learn from residents, not from any official record. There's no city-wide published table of road water depths that we could find.
What should you ask residents?
- Did water enter the basement or ground-floor flats in the last two monsoons?
- How long did the approach road stay blocked?
- Does the association pay for pumping, and how often?
- Has anyone claimed on home insurance for flood damage?
Ask for the association's minutes if you can. They're often more honest than memories.
Flood check before you pay a token
- Varunamitra map checked for your approach road and nearest junction
- Drain type and distance confirmed on the approved plan
- Lake boundary distance checked if a lake is within about 100 m
- Basement ramp crest measured against the road
- Two residents asked about the last two monsoons
- Visited the morning after heavy rain
- An alternative route out that avoids the listed junction
For the wider corridor, see our guides to living on Sarjapur Road and Bellandur. For the citywide picture, use the KSNDMC-based flood map. On a visit, add these to our site visit checklist.
Related reading on this site: buying near Bellandur or Varthur lake, Panathur Road access, and what to check on a site visit.
This is general information, not legal advice. Whether a building respects a drain or lake buffer is a question for a surveyor and a property lawyer.
Frequently asked questions
Is Sarjapur Road flood-prone?
Parts of it flood and parts don't. The official list is of road points, such as Panathur 'S' Cross and Silk Board, not neighbourhoods. Check the specific flat's approach road, drain distance and basement level instead of relying on the area's reputation.
How do I check if a flat floods in Bengaluru?
Look up vulnerable spots on the Varunamitra map, confirm the drain or lake distance on the approved plan, measure the basement ramp against the road and ask residents about the last two monsoons. A visit after heavy rain tells you the most.
What is the rajakaluve buffer?
Under RMP-2015, as cited by the Supreme Court in 2019, primary drains (rajakaluves) carry a 50 m buffer, secondary drains 25 m and tertiary drains 15 m. The type of drain decides which applies.
Does the city flood list cover outer Sarjapur Road?
No. The 101-point list covers the five GBA corporations. Outer Sarjapur Road falls in Anekal taluk, so you'll need to rely on site checks, survey maps and residents there.
Are upper-floor flats safe from flooding?
Water rarely reaches upper floors, but you still share the basement, the lifts' pits and the approach road. A flooded road or basement affects every resident, whichever floor you're on.
What is the GATE check?
It's our four-part flood check for one flat: ground level of the basement ramp, approach road flood spots, things nearby such as drains and lakes, and evidence from residents and a visit after rain.
Talk it through with acre&key
If you've shortlisted a flat on Sarjapur Road or the ORR and want the plan and site read with you, book a consultation with acre&key.
Lawyer note: This is general information, not legal advice. Whether a building respects a drain or lake buffer is a question for a surveyor and a property lawyer.
References
Checked 19 Oct 2026.
- The New Indian Express, 52 of 101 flood-prone locations yet to be fixed, 11 Apr 2026 (news): https://www.newindianexpress.com/cities/bengaluru/2026/Apr/11/52-of-101-flood-prone-locations-in-bengaluru-yet-to-be-fixed-before-monsoon
- The Hindu, GBA directs five corporations on pre-monsoon preparedness, 2026 (news): https://www.thehindu.com/news/national/karnataka/gba-directs-five-corporations-to-step-up-pre-monsoon-preparedness/article70816622.ece
- Varunamitra (Govt of Karnataka), vulnerable spots map: https://varunamitra.karnataka.gov.in/Default/Index?service=VulnerableSpots
- Supreme Court of India, judgment of 5 Mar 2019 (RMP-2015 drain buffers): https://api.sci.gov.in/supremecourt/2016/16740/16740_2016_Judgement_05-Mar-2019.pdf
- Karnataka Tank Conservation and Development Authority (Amendment) Bill 2025, as passed (Act 19 of 2026): https://kla.kar.nic.in/council/house/bills/156/33E.pdf
- K-RERA project search (Anekal taluk counts, 15 Oct 2026): https://rera.karnataka.gov.in/viewAllProjects?language=en