Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Doddanagamanagala Lake

ರಾಯಸಂದ್ರ ಕೆರೆ

Also called Rayasandra Kere, Rayasandra Lake

Kere, a large tank, in Rayasandra village, Anekal taluk

See it on the map
Size
70.7 acresAbout 40 football pitches
Rank by size
113th largestOf 1,621 lakes that still exist
Valley
Dakshina Pinakini
Who looks after it
ZPZilla Panchayat
Water quality
Fit only for irrigationTested Jul 2026
Built over
0.2% of the lakeSatellite land cover, 2021
Campaign
Residents are organising here

Through the years

Nothing on record for 1924 to 1944, 1946 to 1954, 1956 to 1979 and 1981 to 1983.

The records listed below, drawn on one line from 1923 to 2026.

  1. 1923

    Built

    As the 2018 lake survey records it

    See source

  2. 1945

    On the survey map

    See source

  3. 1955

    On the U.S. Army map

    Compiled from Survey of India maps of 1945-46

    See source

  4. 1980

    On the survey map

    See source

  5. 1984-2021

    Held water most years

    Water in 36% of all satellite passes, 1984-2024

    2% of its water area has since gone dry; 40% is new water

    4 years not counted: the satellite saw under half the lake

    Floating weed looks like dry land to this record, so a weed-covered year can read as dry

    See sourceSee source

  6. 2017-2018

    In the water bodies census, not marked as encroached

    This census's status marks are often wrong

    See source

  7. 2017-2025

    Mostly water every year

    About three in four of these readings are right, so trust what holds for several years

    See source

  8. 2018

    Still there in the 2018 lake survey

    Sewage, 82.1 acres surveyed

    Restored, year not recorded

    See source

  9. 2023-2026

    Tested by the state board in 36 months, most often fit only for irrigation

    Jul 2023 to Jul 2026

    See every testSee source

  10. 2025-2026

    Mostly floating weed after the monsoon and in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 24% open water
    • 75% floating weed
    • 2% dry or built

    Dry season, Mar 2026 to May 2026

    • 0.1% open water
    • 96% floating weed
    • 4% dry or built
    See source

How big it is

The records disagree on its size, so each measure is shown.

Drawn outline
70.7 acres

About 40 football pitches

See source
2018 lake survey
82.1 acres

About 47 football pitches

See source
End to end
988 m

The longest straight line across the outline

See source
Deepest point, 2018
4 m
See source
Kind of lake
Kere, a large tank
See source

How clean the water is

Latest test
Fit only for irrigation

Fit only for irrigation, cooling and waste disposal. Class E on the state board’s scale from A, the cleanest, to E.

Tested Jul 2026

See source
Class each month, tested 36 times since Jul 2023
Fit only for irrigation: 36 months. Every month is listed in the readings below.
Drinkable after disinfection
Fit for bathing
Drinkable after treatment
Fit only for wildlife and fish
Fit only for irrigation
See source
How it looked in 2018
Sewage
See source
What pollutes it, 2018

Sewage

See source
Sewage flows in, 2018

From the south-east

See source
Older tests
2 readings

From 2021

See source
Inlet and outlet tests, 2017-18
1 readings
See source
Every reading
Show every reading

Latest test, Jul 2026. Too low to measure: boron, nitrite, phenolphthalein alkalinity

MeasureUnitValue
Water temperature°C20
Dissolved oxygenmg/L1.7
pH7.1
ConductivityµS/cm1,911
BODmg/L31
Nitratemg/L as N7.7
Faecal coliformMPN/100mL630
Total coliformMPN/100mL2,200
Bicarbonatemg/L548
TurbidityNTU12.6
Total alkalinitymg/L as CaCO3548
Chloridemg/L328
CODmg/L240
Kjeldahl nitrogenmg/L as N32
Ammonia nitrogenmg/L as N26
Total hardnessmg/L as CaCO3352
Calcium hardnessmg/L as CaCO3180
Calciummg/L72
Magnesium hardnessmg/L as CaCO3172
Magnesiummg/L41.8
Sulphatemg/L31
Sodiummg/L181
Dissolved solidsmg/L1,296
Suspended solidsmg/L16
Phosphatemg/L0.95
Potassiummg/L14
Fluoridemg/L0.33
Sodium share%51
Sodium adsorption ratio4.2
Orthophosphatemg/L2.65

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jul 2026E1.7316302,200See source
Jun 2026E2.8314602,100See source
May 2026E1.8661,3006,300See source
Apr 2026E0.56317,00049,000See source
Mar 2026E17731,0001,30,000See source
Feb 2026E1.2482,10028,000See source
Jan 2026E0.7382,6007,000See source
Dec 2025E1.35233,00079,000See source
Nov 2025E0.9323,2009,400See source
Oct 2025E2292102,200See source
Sep 2025E3214304,300See source
Aug 2025E1262,10011,000See source
Jul 2025E0.8839,30049,000See source
Jun 2025E0.6672,40014,000See source
May 2025E1.22611,00079,000See source
Apr 2025E301,4007,900See source
Mar 2025E1.8352,20035,000See source
Feb 2025E1.9351,2007,900See source
Jan 2025E311,2007,900See source
Dec 2024E31511,00046,000See source
Nov 2024E2146,80033,000See source
Oct 2024E1.22426,00094,000See source
Sep 2024E0.73817,00070,000See source
Aug 2024E2453,20014,000See source
Jul 2024E3.2305809,200See source
Jun 2024E1.51514,00049,000See source
May 2024E0.9416,80033,000See source
Apr 2024E663,20014,000See source
Mar 2024E661,7007,900See source
Feb 2024E1234,90017,000See source
Jan 2024E4014,00026,000See source
Dec 2023E1.6204,70,00054,00,000See source
Oct 2023E0.4242,10054,000See source
Sep 2023E3.5124,90092,000See source
Aug 2023E232,20092,000See source
Jul 2023E3.31846,0003,50,000See source

Older tests

DateWhereReadingWater temperature°CDissolved oxygenmg/LpHConductivityµS/cmBODmg/LNitrate and nitritemg/L as NFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
2021Rayasandra Lake, TankLowest250.36.71,03551.157,90054,000See source
2021Rayasandra Lake, TankHighest255.87.91,563202494,0005,40,000See source

Inlet and outlet tests, 2017-18 lake survey

DateWhereWater temperature°CLight transparencycmpHConductivityµS/cmDissolved solidsmg/LSuspended solidsmg/LTurbidityNTUDissolved oxygenmg/LCODmg/LBODmg/LTotal phosphateKjeldahl nitrogenmg/L as NTotal coliformMPN/100mL
2017-12-0523.3147.6975860381744018.75221350
See source

How much is built over

Built inside the outline
0.2%

From satellite land cover, 2021

See source
Dumped in it

Garbage dump

See source
Land record maps
See source
Land within 500 m

44% built, 21% trees, 18% crops, 10% grass, 8% shrubs, 0.6% bare ground

From satellite land cover, 2021

See source

Who looks after it

Looked after by
Zilla Panchayat

ZP

See source
Campaign pages
See source

Where its water comes from and goes

Valley
Dakshina Pinakini

The river basin its water drains to

See source
Water comes from
See source
Overflows into

Gattihalli Govt Lake

See source
Catchment
11.7 km²

The land that drains into it

See source
Fed by, 2018 survey

Rain & drain fed

See source
Built parts, 2018 survey

2 inlet drains, 1 overflow weir, 1 sluice gate, no culverts, no check dams and no islands

See source
Used for, 2018 survey

Washing and Swim. idolimmers

See source

What lives here

Birds recorded
72 species

Most seen: Gray Heron, Little Egret, Purple Heron, Indian Pond-Heron and White-throated Kingfisher.

313 sightings, mostly from birdwatchers

See source
All wildlife recorded
82 species

325 records, 2013 to 2021

See source
Threatened species seen here
2
  • Spot-billed Pelican near threatened
  • River Tern vulnerable
See source
Photographed on iNaturalist
8 times

7 species, 6 confirmed by other naturalists.

Most seen: Andrographis serpyllifolia, Teasel Gourd, Dwarf Morning Glory, Limnophila repens and Wide Spikenard.

Last seen Feb 2020

See source
Animals seen, 2018 survey

Butterflies and dragonflies

See source
Water plants, 2018 survey

Rooted floating

See source
Weed cover, 2018 survey

Partial

See source

Around it

Around it in 2018

Eucalyptus plantation, layout, & vacant land

See source

Photos

No photos of it on Wikimedia Commons yet.

Where it is

Greater Bengaluru
Outside the city limits
See source
Village
Rayasandra

Sarjapura hobli, Anekal taluk, Bengaluru Urban district

See source
Land survey numbers

87 (Rayasandra), 54 (Doddanagamangala)

See source
Height above sea level
932 m
See source
Coordinates

12.8701° N, 77.6778° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
289
2018 lake survey
BUAKSPrys_kr4-1015
Lake Development Authority
LDA127
KGIS tank map
613
Water bodies census
1/12/002/000003/000033/002