Buying Near a Storm Water Drain in Bangalore: Rajakaluve Buffer Rules and Checks

A drain that nobody notices from the road can undo a property purchase months later. Bangalore's storm water channels, called rajakaluves, come with a protected margin on both banks where building is forbidden. Breaking that rule brings notices, demolition and lenders who walk away. This guide sets out the margins valid in October 2026, where to find a drain on paper and in the field, and the order to do it in.

Three Margins, Three Drain Classes

The Urban Development Department published its final notification on 15 October 2025, amending the zoning regulations for drains. Its reach is the entire Bangalore Metropolitan Region, covering Greater Bengaluru as well as every remaining planning authority. Each margin is counted from the drain's edge in the revenue records, on both banks:

• Primary drains need 15 metres kept clear
• Secondary drains need 10 metres
• Tertiary drains need 5 metres

The numbers are smaller than before. The 2015 master plan revision asked for as much as 50 metres along a primary drain, and the National Green Tribunal went further in 2016. In March 2019 the Supreme Court cancelled the Tribunal's directions, but old write-ups, brokers and a few sanctioned plans still repeat the bigger figures.

Two practical lessons come out of this. Buildings cleared under the earlier rule kept the wider margin, so their plans may show more open space beside the drain than new projects do. Citizen groups have also objected to the reduced widths, so a fresh challenge is possible, which makes the wider figure a prudent comfort distance.

Who Owns What: Bed and Margin

The channel itself is government land and is entered as kharab in village survey records. A private person cannot own it, sell it or build on it, regardless of what a deed claims. Whatever is built on the bed counts as encroachment, and removal can happen with no compensation.

The margin is another matter, being usually private land alongside the channel. Ownership stays with the holder, but the strip must remain open ground. If part of a plot falls within the margin, the usable area shrinks below what the deed shows, and the asking rate should shrink with it.

How Drains Disappear from View

Bangalore has over 800 km of rajakaluves. Through decades of growth many were narrowed, capped with slabs or simply built over, so a person can walk over a drain without noticing it. The line is still preserved in village maps and in the corporation's maps of drains, and officials go by those.

The 2022 floods led the city corporation to list structures on drain land and start removing them. Deeds and an unbroken chain of title prove who owns land. They do not prove that no drain crosses it, so the two questions need separate answers.

Papers to Pull Out

All drain records are indexed by survey number, which is why that number is where the search begins. Lay each paper below beside the plot:

• Village map with the survey sketch, in which drains and similar government-owned strips are drawn
• The RTC entry giving kharab acreage within the number
• The land use map of the 2015 master plan revision, which separates the three drain classes
• The drain division's map at the city corporation
• Any approved layout or building plan, which should depict the drain and the strip kept open
• Dishaank, an app that places the survey number on satellite imagery at the buyer's own location

Offices have occasionally drawn one drain along different paths or under different classes. If two records conflict, the drain division at the corporation can issue a written clarification that settles it. Outside corporation limits the tahsildar's office or the local planning authority does the same.

Measuring It on the Ground

Hire a licensed surveyor to carry the drain's line from the records to the site and to measure the gap up to the plot boundary. It is a job of a day or two, and the fee is small beside the cost of the land. File the signed sketch showing the measured distance and its date.

Walk the site too. A row of slabs, a lower strip of ground, a culvert beneath the approach lane or a neighbour's wall with an unexplained bend are all clues. Heavy rain, or the hours after it, reveals where water actually travels.

What Lenders Think

Every bank deputes its own valuer and lawyer for a property it funds. Land on a drain or inside the margin carries demolition risk, so many lenders decline, or agree to finance only part of the value. A refusal is a free and loud warning about the property.

Request a lender's early view before any sizeable advance goes out. Where several banks have already cleared a project, it has survived the check repeatedly. A seller who wants cash alone for land beside a drain deserves more questions.

Flats and Projects Near a Drain

Flat buyers carry the same worry at the scale of a whole project. The approved plan, available on the state's RERA website, shows the site edge and should mark the drain and its margin. Towers, basements and ramps belong outside that margin, which is generally left as a road, a belt of trees or open ground.

In a finished project, the occupancy certificate offers the firmest assurance, as it follows a check of the building against the sanctioned plan. An older block without one calls for a surveyor's drain report. Advisers on our team assist buyers around Bangalore in requesting such papers from developers.

Eight Steps in Order

The sequence goes from free tasks to paid ones, which lets a bad plot fall away early:

1. Copy the survey number, size and boundaries from the deed and khata.
2. Search the number on the Dishaank app and the master plan, scanning for drains or lakes close by.
3. Go through the RTC and village map, looking for government-owned drain strips inside or beside the number.
4. Walk round the plot and ask the neighbours where rainwater collects.
5. Get the approved plan from the seller and note how it shows the drain and margin.
6. Book a licensed surveyor to take the drain-to-plot measurement.
7. Ask the drain division for written clarification if the measured gap is near the limit.
8. Obtain a bank's legal and valuation opinion ahead of any sale agreement.

Lakes carry margins of their own under a separate rule, so land beside a lake needs that check as well. Waterlogging is a related matter, since a plot clear of every margin can still flood from a low road.