Leaving
Level 1 · WatchTue 10 Nov
Watch on 45 km between Bogawantalawa and Hatton
Around Bogawantalawa and Norwood, km 106–122, km 150–180.
You reach it about Tue 11:05, 2 h 30 min after leaving, and are through it by Tue 13:45.
NBRI’s bulletin is valid until Tue 20:00, so it covers that time.
NBRI’s advice, as issued
Since the rainfall within the past 24 hours has exceeded 75mm, if the rain continues, be watchful on the possibility of landslides, slope failures, rock falls, cutting failures and ground subsidence.
NBRI, issued Mon 9 Nov, 20:00 · valid to Tue 10 Nov, 20:00lankawatch.org
Your road · 180 km~5 h 10 min
NBRI WatchNot listedOutside NBRI areaRiver crossingRain gaugeNo report
- Hambantota
Outside NBRI’s landslide area: the bulletin says nothing herekm 0–38 - Not listedkm 38–106
- Watchkm 106–122
- near Bogawantalawa
Not listedkm 122–150 - Bogawantalawa to Hatton
Watchkm 150–180
Level 2 · AlertTue 10 Nov
Alert on 12 km near Pallebedda
km 82–94, km 99–100.
Also: Watch on 48 km between Pallebedda and Hatton
You reach it about Tue 10:10, 1 h 40 min after leaving, and are through it by Tue 10:55.
NBRI’s bulletin is valid until Tue 20:00, so it covers that time.
NBRI’s advice, as issued
Since the rainfall within the past 24 hours has exceeded 100 mm, if the rains continue, be on alert on the possibility of landslides, slope failures, rock falls, cut failures and ground subsidence, being ready to evacuate to a safe location if the need arises.
NBRI, issued Mon 9 Nov, 20:00 · valid to Tue 10 Nov, 20:00lankawatch.org
Your road · 181 km~5 h 30 min
NBRI AlertNBRI WatchNot listedOutside NBRI areaRiver crossingRain gaugeNo report
- Hambantota
Outside NBRI’s landslide area: the bulletin says nothing herekm 0–36 - near Padalangala
Not listed, Outside NBRI’s landslide area: the bulletin says nothing herekm 36–39 - Padalangala to Embilipitiya
Not listedkm 39–80 - Pallebedda
Watchkm 80–83 - near Pallebedda
Alertkm 83–94 - Not listedkm 94–105
- Watchkm 105–121
- Pinnawala Town
Not listedkm 121–152 - Bogawantalawa to Hatton
Watchkm 152–181
LandslideAlert5 stretches · NBRI’s adviceRainModerate rain, up to 12.2 mm in 24 hLast 3 days, satellite: About 1–2 days a month are this wet hereWeatherNo advisory for this roadRivers9 crossingsMoraketiya: Alert level · Walawe Ganga basin rain: Rare here (1–2 days a month) · rain upstream of Walawe Ganga: Rare here (1–2 days a month)
Level 2 · AlertTue 10 Nov
Alert on 36 km between Puwakpitiya and Watawala
Around Dehiowita and Ginigathhena, km 247–262, km 286–309.
Also: Watch on 87 km between Homagama and Hatton
You reach it about Tue 12:30, 4 h after leaving, and are through it by Tue 14:20.
NBRI’s bulletin is valid until Tue 20:00, so it covers that time.
NBRI’s advice, as issued
Since the rainfall within the past 24 hours has exceeded 100 mm, if the rains continue, be on alert on the possibility of landslides, slope failures, rock falls, cut failures and ground subsidence, being ready to evacuate to a safe location if the need arises.
NBRI, issued Mon 9 Nov, 20:00 · valid to Tue 10 Nov, 20:00lankawatch.org
Your road · 321 km~6 h 20 min
NBRI AlertNBRI WatchNot listedOutside NBRI areaRiver crossingRain gaugeNo report
- Hambantota to Ranna
Outside NBRI’s landslide area: the bulletin says nothing herekm 0–66 - Thihagoda to Imaduwa
Not listedkm 66–139 - Watchkm 139–148
- Not listedkm 148–155
- Watchkm 155–171
- Homagama to Meegoda
Not listedkm 171–222 - Meepe to Puwakpitiya
Watchkm 222–248 - Dehiowita
Alertkm 248–262 - Yatiyantota to Kithulgala
Watchkm 262–286 - Ginigathhena to Watawala
Alertkm 286–309 - Hatton
Watchkm 309–321
LandslideAlert7 stretches · NBRI’s adviceRainHeavy rain, up to 126.5 mm in 24 hLast 3 days, satellite: Only a few days a year are this wet here · Last this wet in Dehiovita: November 2025WeatherNo advisory for this roadRivers33 crossingsBaddegama: Minor flood level · rising · Walawe Ganga basin rain: Rare here (1–2 days a month) · rain upstream of Kalu Ganga: Rare here (1–2 days a month)
Next update usually today by 17:45.
Before you go
We don’t know about road closures or damage. Be cautious on the way, especially in the hills in rain.
About the Hambantota–Hatton road
The fastest road we know from Hambantota to Hatton is 180 km, about 5 h 10 min, via Bogawantalawa.
Main roads on it: Bodagma-Hambegamuwa-Kaltota Road (36 km), Norwood-Bogawantalawa-Campion Road (16 km), Andarawewa - Hambantota Highway (16 km).
We show 3 roads between them, fastest first.
DS divisions on this road
It passes through 9 DS divisions in 5 districts, in travel order:
Past NBRI bulletins
Most often listed on this road, in the 41 NBRI bulletins we have passed on since Sun 20 Sept: Imbulpe (19), Balangoda (17), Norwood (16).
A record of past bulletins, not a forecast. Not being listed doesn’t mean safe.
Steep terrain
About 6 km of it runs through steep terrain (slopes over 30° beside the road).
Terrain beside the road, from a satellite elevation model: not the road’s gradient and not a landslide hazard rating.
How to read this
- Not an official service. NBRI’s warnings are passed on as issued.
- Rain levels compare each division with its own satellite record since 2000. Satellites can miss heavy local downpours.
- Gauge sources: Department of Meteorology and Irrigation Department gauge readings, passed on as published. Met gauge sites are approximate. Compared with each division's own satellite record since 2000. This is not a warning and does not replace NBRI's levels. Satellites can miss heavy local downpours, so it never means a road is safe. Satellite data up to 10 Nov, 02:30. Checked Tue 10 Nov, 08:30.
Was this page useful?Thanks, noted.
Landslide (NBRI)
×| Warned DS division | Level | From km |
|---|---|---|
| Balangoda | Watch | 106 |
| Norwood | Watch | 150 |
Rain on route
×Moderate rain, up to 12.2 mm in 24 h
Rain gauges near your route
12345678910111213
0180 km
Key
DryLight rainModerate rainHeavy rainVery heavy rainNo rain report
- 1 Hambantota, 0 mm, dry
- 2 Mattala, 12.2 mm, moderate rain
- 5 Samanala Wawa, 0 mm, dry
- 12 Norwood, ≥ 6.7 mm, light rain or more (incomplete day)
9 gauges not reporting.
Gauge coverage: most of the route.
NBRI's warning stays in force after rain eases.
Satellite estimate
- Last 3 days: among the wettest 5% of 3-day periods since 2000 in Kaltota, Balangoda, Imbulpe, Norwood.
Rain outlook (computer model) · Next day: Chance of a rare wet day
- Next day: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Sooriyawewa, Sevanagala, Thanamalvila +5 (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 11 Nov, 05:30)
- Next 3 days: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Sooriyawewa, Sevanagala, Thanamalvila +5 (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 13 Nov, 05:30)
- "Not signalled" never means dry or safe. This is a computer model, not a warning, and it never changes NBRI's levels. Like the satellite, it reads hill-country rain low and can miss heavy local downpours.
- ECMWF ensemble forecast (open data, CC BY 4.0), run 9 Nov, 17:30, compared with each division's own satellite record.
Weather forecast (Met Dept)
×No advisory for this road
- No Department of Meteorology advisory is in force for Hambantota, Moneragala, Ratnapura, Badulla and Nuwara Eliya.
- Forecast issued 10 Nov, 05:30
- Showers or thundershowers will occur at times in the Northern province and in Trincomalee district.
- Showers or thundershowers will occur elsewhere in the island after 1.00 p.m.
- Covers Ratnapura, Nuwara Eliya, Badulla and Moneragala on this road: Heavy falls above 100mm are likely at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle and Matara districts.
- Covers Hambantota on this road: Showers may occur in the coastal areas of the Southern Province during the morning.
- The general public is kindly requested to take adequate precautions to minimize damage caused by temporary localized strong winds and lightning during thundershowers.
- Covers Ratnapura, Nuwara Eliya, Badulla and Moneragala on this road: Misty conditions can be expected at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle, Matara and Kurunegala districts during the early hours of the morning.
- A forecast never lowers or replaces the NBRI landslide warning above.
- Forecast and advisories by the Department of Meteorology, Sri Lanka, as issued. LankaWatch is not an official service.
Rivers and catchments
×Crosses 11 named rivers · 5 basins · Walawe Ganga basin rain: Rare here (1–2 days a month)
Karagan Oya · Malala Oya · Walawe Ganga …
NorwoodBelow Alert · River level 1.2 mDepartment’s thresholds: Alert 1.5, minor flood 3, major flood 4.5 m
River basins along this road
- km 0–1 · Karagan Oya basin
- km 6–17 · Karagan Oya basin
- km 17–22 · Malala Oya basin
- km 22–53 · Walawe Ganga basin
- km 54–63 · Malala Oya basin
- km 63–150 · Walawe Ganga basin
- km 150–178 · Kelani Ganga basin
- km 178–180 · Mahaweli Ganga basin
Satellite rain over these basins
- Walawe Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kelani Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Mahaweli Ganga basin · Last 3 days: Unusual here (3 days a month)
A whole-basin satellite average against that basin’s own record since 2000, not the area upstream of any one point. Satellites under-read hill rain. Not a warning.
Where this road crosses a river or stream
- km 26 · Maha Ara (Walawe Ganga basin) · flows south-east
0.1 km² drain to this point - km 31 · Mahakadawala Ara (Walawe Ganga basin) · flows south-west
18 km² drain to this point - km 64 · Duagas Ara (Walawe Ganga basin) · flows south-west
0.8 km² drain to this point - km 75 · Mau Ara (Walawe Ganga basin) · flows south
56 km² drain to this point - km 79 · Kanducliya Ara (Walawe Ganga basin) · flows south
1.5 km² drain to this point - km 90 · Weli Oya (Walawe Ganga basin) · flows south-west
264 km² drain to this point · rain over that area, Last 3 days: Unusual here (3 days a month) - km 95 · Muttukelina Ara (Walawe Ganga basin) · flows west
0.1 km² drain to this point - km 107 · Diyawini Oya (Walawe Ganga basin) · flows south
2.5 km² drain to this point - km 131 · Kiriketi Oya (Walawe Ganga basin) · flows south-east
19 km² drain to this point - km 138 · Belihul Oya (Walawe Ganga basin) · flows south-west
27 km² drain to this point - km 156 · Hambamata Oya (Kelani Ganga basin) · flows north-west
27 km² drain to this point
Norwood, an Irrigation Department gauge 13.4 km downstream (97 km² upstream): at least 6.7 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:02.
River level 1.2 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 1.5, minor flood 3, major flood 4.5 m) - km 162–170 · Hambamata Oya (Kelani Ganga basin) · 8 crossings · flows north-west
97 km² drain to this point
Norwood, an Irrigation Department gauge 0.4 km downstream (97 km² upstream): at least 6.7 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:02.
River level 1.2 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 1.5, minor flood 3, major flood 4.5 m)
And 4 more unnamed streams on our map
Where this road runs beside a river
- km 165–167 · beside the Hambamata Oya
- km 167–168 · beside the Hambamata Oya
Rivers and basins come from our own map of Sri Lanka’s river network. Flow direction, where shown, is worked out from the height of the land. This is orientation only, not a flood warning.
The area draining to a crossing is worked out from a terrain model (about 90 m cells) and is approximate. The rain over it is the satellite average for that same area, against its own record since 2000. Areas under about 150 km² are smaller than the satellite can see, so they show no rain.
River levels are the Irrigation Department’s own readings at its gauge, against its own thresholds. This is not a flood warning: flood warnings come from the Irrigation Department and DMC.
Landslide (NBRI)
×| Warned DS division | Level | From km |
|---|---|---|
| Weligepola | Alert | 83 |
| Godakawela | Watch | 80 |
| Balangoda | Watch | 105 |
| Norwood | Watch | 152 |
Rain on route
×Moderate rain, up to 12.2 mm in 24 h
Rain gauges near your route
123456789101112131415161718
0181 km
Key
DryLight rainModerate rainHeavy rainVery heavy rainNo rain report
- 1 Hambantota, 0 mm, dry
- 2 Mattala, 12.2 mm, moderate rain
- 9 Samanala Wawa, 0 mm, dry
- 17 Norwood, ≥ 6.7 mm, light rain or more (incomplete day)
14 gauges not reporting.
Gauge coverage: most of the route.
NBRI's warning stays in force after rain eases.
Satellite estimate
- Last 3 days: among the wettest 5% of 3-day periods since 2000 in Embilipitiya, Godakawela, Weligepola, Opanayake +3.
Rain outlook (computer model) · Next day: Chance of a rare wet day
- Next day: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Sooriyawewa, Embilipitiya, Godakawela +5 (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 11 Nov, 05:30)
- Next 3 days: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Sooriyawewa, Embilipitiya, Ambalantota +6 (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 13 Nov, 05:30)
- "Not signalled" never means dry or safe. This is a computer model, not a warning, and it never changes NBRI's levels. Like the satellite, it reads hill-country rain low and can miss heavy local downpours.
- ECMWF ensemble forecast (open data, CC BY 4.0), run 9 Nov, 17:30, compared with each division's own satellite record.
Weather forecast (Met Dept)
×No advisory for this road
- No Department of Meteorology advisory is in force for Hambantota, Ratnapura and Nuwara Eliya.
- Forecast issued 10 Nov, 05:30
- Showers or thundershowers will occur at times in the Northern province and in Trincomalee district.
- Showers or thundershowers will occur elsewhere in the island after 1.00 p.m.
- Covers Ratnapura and Nuwara Eliya on this road: Heavy falls above 100mm are likely at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle and Matara districts.
- Covers Hambantota on this road: Showers may occur in the coastal areas of the Southern Province during the morning.
- The general public is kindly requested to take adequate precautions to minimize damage caused by temporary localized strong winds and lightning during thundershowers.
- Covers Ratnapura and Nuwara Eliya on this road: Misty conditions can be expected at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle, Matara and Kurunegala districts during the early hours of the morning.
- A forecast never lowers or replaces the NBRI landslide warning above.
- Forecast and advisories by the Department of Meteorology, Sri Lanka, as issued. LankaWatch is not an official service.
Rivers and catchments
×Crosses 7 named rivers · 6 basins · Walawe Ganga basin rain: Rare here (1–2 days a month) · rain upstream of Walawe Ganga: Rare here (1–2 days a month) · Alert level
Karagan Oya · Malala Oya · Walawe Ganga …
MoraketiyaAlert level · River level 3.05 mDepartment’s thresholds: Alert 3, minor flood 5, major flood 7 m
River basins along this road
- km 0–1 · Karagan Oya basin
- km 1–2 · Karagan Oya basin
- km 2–4 · Karagan Oya basin
- km 6–16 · Karagan Oya basin
- km 16–21 · Malala Oya basin
- km 22–94 · Walawe Ganga basin
- km 94–114 · Kalu Ganga basin
- km 114–152 · Walawe Ganga basin
- km 152–179 · Kelani Ganga basin
- km 179–181 · Mahaweli Ganga basin
Satellite rain over these basins
- Walawe Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kalu Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kelani Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Mahaweli Ganga basin · Last 3 days: Unusual here (3 days a month)
A whole-basin satellite average against that basin’s own record since 2000, not the area upstream of any one point. Satellites under-read hill rain. Not a warning.
Where this road crosses a river or stream
- km 25 · Maha Ara (Walawe Ganga basin) · flows south-east
0.1 km² drain to this point - km 30 · Mahaweligada Ara (Walawe Ganga basin) · flows south-west
23 km² drain to this point - km 30 · Mahakadawala Ara (Walawe Ganga basin) · flows south-west
23 km² drain to this point - km 37 · Walawe Ganga · flows south
2,201 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month)
Moraketiya, an Irrigation Department gauge 13.9 km upstream (1,541 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): no complete 24-hour total (3 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:04.
River level 3.05 m · Alert level (Department’s thresholds: Alert 3, minor flood 5, major flood 7 m) - km 51 · Hulanda Oya (Walawe Ganga basin) · flows north-east
172 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 64 · Tlmbolketiya Ganga (Walawe Ganga basin) · flows east
253 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 121 · Walawe Ganga · flows south-east
132 km² drain to this point - km 158 · Hambamata Oya (Kelani Ganga basin) · flows north-west
27 km² drain to this point
Norwood, an Irrigation Department gauge 13.4 km downstream (97 km² upstream): at least 6.7 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:02.
River level 1.2 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 1.5, minor flood 3, major flood 4.5 m) - km 164 · Hambamata Oya (Kelani Ganga basin) · flows west
63 km² drain to this point
Norwood, an Irrigation Department gauge 6.7 km downstream (97 km² upstream): at least 6.7 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 0 mm in the 3 hours to 10 Nov, 08:02.
River level 1.2 m · Below Alert · falling over about 3 hours (Department’s thresholds: Alert 1.5, minor flood 3, major flood 4.5 m)
And 20 more unnamed streams on our map
Rivers and basins come from our own map of Sri Lanka’s river network. Flow direction, where shown, is worked out from the height of the land. This is orientation only, not a flood warning.
The area draining to a crossing is worked out from a terrain model (about 90 m cells) and is approximate. The rain over it is the satellite average for that same area, against its own record since 2000. Areas under about 150 km² are smaller than the satellite can see, so they show no rain.
River levels are the Irrigation Department’s own readings at its gauge, against its own thresholds. This is not a flood warning: flood warnings come from the Irrigation Department and DMC.
Landslide (NBRI)
×| Warned DS division | Level | From km |
|---|---|---|
| Dehiovita | Alert | 248 |
| Ambagamuwa | Alert | 286 |
| Karandeniya | Watch | 139 |
| Elpitiya | Watch | 142 |
| Walallavita | Watch | 155 |
| Mathugama | Watch | 162 |
| Padukka | Watch | 222 |
| Seethawaka | Watch | 224 |
| Yatiyanthota | Watch | 262 |
| Norwood | Watch | 309 |
Rain on route
×Heavy rain, up to 126.5 mm in 24 h
Rain gauges near your route
1234567891011121314151617181920212223242526272829303132333435
0321 km
Key
DryLight rainModerate rainHeavy rainVery heavy rainNo rain report
- 1 Hambantota, 0 mm, dry
- 3 Thalgahagoda, ≥ 3.2 mm, light rain or more (incomplete day)
- 6 Galle, 0.7 mm, dry
- 9 Baddegama, ≥ 18.3 mm, moderate rain or more (incomplete day)
- 14 Putupaula, ≥ 37.2 mm, moderate rain or more (incomplete day)
- 16 Ratmalana, 14.6 mm, moderate rain
- 17 Hanwella, 28.6 mm, moderate rain
- 19 Penrith Estate, 126.5 mm, heavy rain
- 29 Kithulgala, 35.9 mm, moderate rain
- 33 Norton, 14.2 mm, moderate rain
25 gauges not reporting.
Gauge coverage: most of the route.
NBRI's warning stays in force after rain eases.
Satellite estimate
- Last 3 days: among the wettest 1% of 3-day periods since 2000 in Dehiovita.
Rain outlook (computer model) · Next day: Chance of a rare wet day
- Next day: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Yatiyanthota, Ambagamuwa, Norwood (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 11 Nov, 05:30)
- Next 3 days: a chance of a wet day of the kind that comes about 1–2 days a month in Hambantota, Ambalantota, Angunakolapelessa, Weeraketiya +2 (the wettest 5% of days there; several times the usual chance). (10 Nov, 05:30 to 13 Nov, 05:30)
- "Not signalled" never means dry or safe. This is a computer model, not a warning, and it never changes NBRI's levels. Like the satellite, it reads hill-country rain low and can miss heavy local downpours.
- ECMWF ensemble forecast (open data, CC BY 4.0), run 9 Nov, 17:30, compared with each division's own satellite record.
Weather forecast (Met Dept)
×No advisory for this road
- No Department of Meteorology advisory is in force for Hambantota, Matara, Galle, Kalutara, Colombo, Kegalle and Nuwara Eliya.
- Forecast issued 10 Nov, 05:30
- Showers or thundershowers will occur at times in the Northern province and in Trincomalee district.
- Showers or thundershowers will occur elsewhere in the island after 1.00 p.m.
- Covers Kegalle, Nuwara Eliya, Colombo, Kalutara, Galle and Matara on this road: Heavy falls above 100mm are likely at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle and Matara districts.
- Covers Galle, Hambantota and Matara on this road: Showers may occur in the coastal areas of the Southern Province during the morning.
- The general public is kindly requested to take adequate precautions to minimize damage caused by temporary localized strong winds and lightning during thundershowers.
- Covers Kegalle, Nuwara Eliya, Colombo, Kalutara, Galle and Matara on this road: Misty conditions can be expected at some places in Western, Sabaragamuwa, Central and Uva provinces and in Galle, Matara and Kurunegala districts during the early hours of the morning.
- A forecast never lowers or replaces the NBRI landslide warning above.
- Forecast and advisories by the Department of Meteorology, Sri Lanka, as issued. LankaWatch is not an official service.
Rivers and catchments
×Crosses 30 named rivers · 17 basins · Walawe Ganga basin rain: Rare here (1–2 days a month) · rain upstream of Kalu Ganga: Rare here (1–2 days a month) · Minor flood level
Karagan Oya · Walawe Ganga · Kachigal Aru …
BaddegamaMinor flood level · River level 4.16 mDepartment’s thresholds: Alert 3.5, minor flood 4, major flood 5 m
River basins along this road
- km 0–1 · Karagan Oya basin
- km 7–12 · Karagan Oya basin
- km 12–25 · Walawe Ganga basin
- km 25–31 · Kachigal Aru basin
- km 31–33 · Kachigal Aru basin
- km 33–47 · Urubokka Ganga basin
- km 47–53 · Rekawa Oya basin
- km 53–61 · Kirama Oya basin
- km 61–67 · Seenimodara Oya basin
- km 67–89 · Nilwala Ganga basin
- km 89–105 · Polwatta Ganga basin
- km 105–109 · Koggala Lake basin
- km 109–142 · Gin Ganga basin
- km 142–144 · Madampe Lake basin
- km 144–173 · Bentota Ganga basin
- km 173–186 · Kalu Ganga basin
- km 186–215 · Bolgoda Ganga basin
- km 215–216 · Bolgoda Ganga basin
- km 216–218 · Kelani Ganga basin
- km 218–219 · Bolgoda Ganga basin
- km 219–298 · Kelani Ganga basin
- km 298–321 · Mahaweli Ganga basin
Satellite rain over these basins
- Walawe Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Gin Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Madampe Lake basin · Last 3 days: Rare here (1–2 days a month)
- Bentota Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kalu Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kelani Ganga basin · Last 3 days: Rare here (1–2 days a month)
- Kachigal Aru basin · Last 3 days: Unusual here (3 days a month)
- Urubokka Ganga basin · Last 3 days: Unusual here (3 days a month)
- Kirama Oya basin · Last 7 days: Unusual here (3 days a month)
- Nilwala Ganga basin · Last 3 days: Unusual here (3 days a month)
- Bolgoda Ganga basin · Last 3 days: Unusual here (3 days a month)
- Mahaweli Ganga basin · Last 3 days: Unusual here (3 days a month)
A whole-basin satellite average against that basin’s own record since 2000, not the area upstream of any one point. Satellites under-read hill rain. Not a warning.
Where this road crosses a river or stream
- km 18 · Karagawa Ara (Walawe Ganga basin)
2,455 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 21 · Walawe Ganga · flows south
0.9 km² drain to this point - km 30 · Kuchigal Ara (Kachigal Aru basin) · flows south
173 km² drain to this point · rain over that area, Last 3 days: Unusual here (3 days a month) - km 56 · Kirama Oya · flows east
115 km² drain to this point - km 62 · Sinimodara Oya · flows south-east
20 km² drain to this point - km 77 · Kanduwela Ela (Nilwala Ganga basin)
35 km² drain to this point - km 81 · Nilwala Ganga · flows south
659 km² drain to this point · rain over that area, Last 3 days: Unusual here (3 days a month)
Thalgahagoda, an Irrigation Department gauge 2.6 km upstream (655 km² upstream · rain over that area, Last 3 days: Unusual here (3 days a month)): at least 3.2 mm in the 24 hours to 9 Nov, 08:30 (1 hourly reading missing); 0 mm in the 3 hours to 10 Nov, 08:09.
River level 1.63 m · Alert level · steady over about 3 hours (Department’s thresholds: Alert 1.4, minor flood 1.7, major flood 2.8 m) - km 96 · Polwatta Ganga
166 km² drain to this point · rain over that area, Last 24 hours: Unusual here (3 days a month) - km 115 · Maha Dola (Gin Ganga basin) · flows west
19 km² drain to this point - km 124 · Keembiya Ela (Gin Ganga basin) · flows north-west
14 km² drain to this point - km 130 · Gin Ganga · flows west
681 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month)
Baddegama, an Irrigation Department gauge 2.6 km downstream (709 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): at least 18.3 mm in the 24 hours to 9 Nov, 08:30 (2 hourly readings missing); 7.8 mm in the 3 hours to 10 Nov, 08:08.
River level 4.16 m · Minor flood level · rising over about 3 hours (Department’s thresholds: Alert 3.5, minor flood 4, major flood 5 m) - km 153 · Uragas Ela (Bentota Ganga basin)
5.2 km² drain to this point - km 156 · Bentota_Gnga (Bentota Ganga basin)
363 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 164 · Welipenne Ganga (Bentota Ganga basin)
131 km² drain to this point - km 177 · Iriyangala Ela (Kalu Ganga basin)
9.7 km² drain to this point - km 185 · Kalu Ganga
2,762 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 187 · Keppu Ela (Bolgoda Ganga basin)
0.4 km² drain to this point - km 193 · Panape Ela (Bolgoda Ganga basin)
66 km² drain to this point - km 200 · Maha Oya (Bolgoda Ganga basin) · flows west
27 km² drain to this point - km 205 · Nudun Ela (Bolgoda Ganga basin) · flows west
35 km² drain to this point - km 220 · Panamnwa Ela (Kelani Ganga basin)
9.8 km² drain to this point - km 222 · Puswell Oya (Kelani Ganga basin)
65 km² drain to this point - km 248 · Gatahatta oya (Kelani Ganga basin) · flows north
51 km² drain to this point - km 259 · Godellakumbura Ela (Kelani Ganga basin) · flows west
17 km² drain to this point - km 265–268 · Kelani Ganga · 2 crossings · flows south-west
542 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month)
Kithulgala, an Irrigation Department gauge 14.7 km upstream (425 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): 35.9 mm in the 24 hours to 9 Nov, 08:30 (Moderate); 0 mm in the 3 hours to 10 Nov, 08:06.
River level 2.24 m · Below Alert · rising over about 3 hours (Department’s thresholds: Alert 3, minor flood 4, major flood 6 m) - km 268 · Madelle Oya (Kelani Ganga basin) · flows north
542 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 269 · Ekki Oya (Kelani Ganga basin) · flows west
537 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 274 · Kelani Ganga · flows west
506 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month)
Kithulgala, an Irrigation Department gauge 8.9 km upstream (425 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): 35.9 mm in the 24 hours to 9 Nov, 08:30 (Moderate); 0 mm in the 3 hours to 10 Nov, 08:06.
River level 2.24 m · Below Alert · rising over about 3 hours (Department’s thresholds: Alert 3, minor flood 4, major flood 6 m) - km 281 · Bibili Oya (Kelani Ganga basin) · flows south
488 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 283 · Girankitte Oya (Kelani Ganga basin) · flows south-west
470 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month) - km 286 · Kelani Ganga · flows west
418 km² drain to this point · rain over that area, Last 3 days: Rare here (1–2 days a month)
Kithulgala, an Irrigation Department gauge 2 km downstream (425 km² upstream · rain over that area, Last 3 days: Rare here (1–2 days a month)): 35.9 mm in the 24 hours to 9 Nov, 08:30 (Moderate); 0 mm in the 3 hours to 10 Nov, 08:06.
River level 2.24 m · Below Alert · rising over about 3 hours (Department’s thresholds: Alert 3, minor flood 4, major flood 6 m) - km 299–310 · Mahaweli Ganga · 11 crossings · flows north-west
25 km² drain to this point - km 315–316 · Mahaweli Ganga · 2 crossings · flows north-west
11 km² drain to this point
And 4 more unnamed streams on our map
Where this road runs beside a river
- km 299–300 · beside the Mahaweli Ganga
- km 301–303 · beside the Mahaweli Ganga
- km 306–308 · beside the Mahaweli Ganga
- km 315–316 · beside the Mahaweli Ganga
Rivers and basins come from our own map of Sri Lanka’s river network. Flow direction, where shown, is worked out from the height of the land. This is orientation only, not a flood warning.
The area draining to a crossing is worked out from a terrain model (about 90 m cells) and is approximate. The rain over it is the satellite average for that same area, against its own record since 2000. Areas under about 150 km² are smaller than the satellite can see, so they show no rain.
River levels are the Irrigation Department’s own readings at its gauge, against its own thresholds. This is not a flood warning: flood warnings come from the Irrigation Department and DMC.