Mahaweli flood watch

Peradeniya · Nawalapitiya · Kotmale reservoir — the upper Mahaweli
Updated
2026-09-24 17:05 SLST · hourly feed
1h ago
Unofficial. This page re-presents the Department of Meteorology / Disaster Management Centre's published river level reports; it is not issued by them and is not an official warning. Do not make an evacuation decision from this page. The official reports are at dmc.gov.lk, and the DMC emergency line in Sri Lanka is 117.

Peradeniya

Normal
4.31m
17:05 SLST · Irrigation Department hourly feed · DMC at 15:30 read 4.22
▲ 0.08 m/h · Alert in ~9h at this rate · +1.42 in 24h
0.69 m below Alert · higher than 90.1% of its history
Alert 5Minor 7Major 9
20 Sep21 Sep22 Sep23 Sep24 Sep
19 Sep 18:30 → 24 Sep 17:05 SLST · shaded: usually, this time of year 1.55–3.86 m, median 2.40 (n=132) · 34 readings from DMC, 119 filling its gaps from the Irrigation Department's hourly feed · the hollow end point (17:05, 4.31 m) is from that feed, ahead of the DMC report above
28.6%Alert3.6%Minor2.4%Major
chance of reaching each level within 24h · from 84 past readings in this state (level only)
For reference: Cyclone Ditwah, Nov 2025

Peak 14.80 m on 28 Nov 2025, 06:30 SLST — 3.0× Alert, 1.6× Major. Today's 4.31 is 29% of it.

27 Nov28 Nov
26 Nov 00:30 → 28 Nov 06:30 SLST

14 readings survive from the event in the archive · at its worst, 9 stations in a single report stood at Major Flood. The gauge then reported nothing for 46 consecutive reports — so this peak is the last reading before it went silent, not necessarily the crest.

Nawalapitiya

Normal
2.76m
17:04 SLST · Irrigation Department hourly feed · DMC at 15:30 read 2.77
▲ 0.03 m/h · Alert in ~24h at this rate · +0.36 in 24h
0.74 m below Alert · higher than 94.5% of its history
Alert 3.5Minor 5Major 6
20 Sep21 Sep22 Sep23 Sep24 Sep
19 Sep 18:30 → 24 Sep 17:04 SLST · shaded: usually, this time of year 1.05–2.53 m, median 1.43 (n=132) · 34 readings from DMC, 119 filling its gaps from the Irrigation Department's hourly feed · the hollow end point (17:04, 2.76 m) is from that feed, ahead of the DMC report above
1.8%Alert<5%Minor<5%Major
chance of reaching each level within 24h · from 55 past readings in this state (level + trend)
For reference: Cyclone Ditwah, Nov 2025

Peak 6.69 m on 28 Nov 2025, 03:30 SLST — 1.9× Alert, 1.1× Major. Today's 2.76 is 41% of it.

27 Nov28 Nov29 Nov30 Nov1 Dec2 Dec3 Dec
26 Nov 00:30 → 3 Dec 21:30 SLST

28 readings survive from the event in the archive · at its worst, 9 stations in a single report stood at Major Flood.

Kotmale reservoir 61% full (+4.0 pts vs previous report) · 690.82 m asl · 12.2 m below FSL 703.0 · read 2026-09-24
Trend chart appears once there are 5 daily readings — 3 so far. Capture began 2026-09-22; the source publishes once a day and keeps no history.

Closest to their thresholds

StationLevelAlertNext level, 24h
Panadugama6.73 m ▲5Minor floodMinor6.3% Major · n=268
Tawalama5.32 m4Alert18.5% Minor · n=135
Baddegama4.40 m ▲3.5Minor floodMinor16.3% Major · n=135
Magura4.92 m ▲4Alert15.5% Minor · n=110
Thalgahagoda1.67 m ▲1.4Alert71.4% Minor · n=49
Ratnapura5.99 m ▲5.2Alert15.7% Minor · n=343
Pitabeddara4.21 m ▼4Alert31% Minor · n=58
The other 29 stations in this report
StationLevelAlertNext level, 24h
Norwood1.37 m ▲1.5Normal19.6% Alert · n=102
Glencourse13.68 m ▲15Normal4.3% Alert · n=92
Putupaula2.62 m ▲3Normal6.6% Alert · n=228
Urawa2.16 m ▼2.5Normal10.9% Alert · n=46
Dunamale2.80 m ▲3.3Normal70% Alert · n=30
Kithulgala2.41 m ▼3Normal24.3% Alert · n=37
Ellagawa8.03 m ▲10Normal23.5% Alert · n=179
Hanwella5.13 m ▲6.5Normal3.8% Alert · n=52
N' Street3.00 ft ▲4Normal10.5% Alert · n=86
Holombuwa2.04 m ▼3Normal14.4% Alert · n=153
Badalgama2.93 m ▲5Normal2.4% Alert · n=42
Deraniyagala2.38 m ▼4.8Normal5.1% Alert · n=98
Moraketiya1.45 m ▲3Normal2.6% Alert · n=302
Giriulla1.88 m ▲5.5Normal1.5% Alert · n=65
Horowpothana1.64 m6Normal<1% Alert · n=531
Thanamalwila1.09 m4Normal0.2% Alert · n=574
Wellawaya0.94 m ▲4.4Normal<0% Alert · n=678
Kuda Oya1.02 m6.9Normal<0% Alert · n=703
Nakkala0.54 m5Normal0.2% Alert · n=657
Yaka Wewa0.41 m4Normal0.5% Alert · n=642
Moragaswewa0.39 m4.75Normal2.4% Alert · n=335
Thanthirimale0.41 m5Normal<1% Alert · n=273
Siyambalanduwa0.15 m4.5Normal<0% Alert · n=667
Thaldena0.09 m ▼3Normal0.2% Alert · n=615
Padiyathalawa0.08 m4Normal0.3% Alert · n=649
Galgamuwa0.02 m4.84Normal<1% Alert · n=224
Katharagama-0.24 m4Normal
Manampitiya-0.26 m ▼3Normal
Weraganthota-3.15 m5Normal