Mahaweli Flood Watch

Peradeniya · Nawalapitiya · Kotmale reservoir — the upper Mahaweli

Updated 13:10 SLST · hourly feed · under an hour 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
4.10m
13:06 SLST · hourly feed
▼ 0.03 m/h · -0.26 in 24h
0.90 m below Alert · higher than 88.5% of its history
Alert 5Minor 7Major 9
21 Sep22 Sep23 Sep24 Sep25 Sep
20 Sep 14:11 → 25 Sep 13:06 SLST · shaded: usually, this time of year 1.55–4.18 m, median 2.50 (n=136)
26.7%Alert3.3%Minor2.2%Major
chance of reaching each level within 24h · from 90 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 4.10 is 28% 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
2.70m
13:10 SLST · hourly feed
▲ 0.07 m/h · 0.80 m below Alert · -0.29 in 24h
0.80 m below Alert · higher than 93.7% of its history
Alert 3.5Minor 5Major 6
21 Sep22 Sep23 Sep24 Sep25 Sep
20 Sep 14:02 → 25 Sep 13:10 SLST · shaded: usually, this time of year 1.05–2.85 m, median 1.51 (n=136)
1.8%Alert<5%Minor<5%Major
chance of reaching each level within 24h · from 56 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 2.70 is 40% 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

Tap a station for its chart and base rates.

StationLevelAlertNext level, 24h
1.90 m1.4Minor floodMinor4.8% Major · n=547
4.70 m3.5Minor floodMinor10.4% Major · n=434
6.47 m ▼5Minor floodMinor6.2% Major · n=273
4.81 m4Alert5.5% Minor · n=91
6.24 m ▼5.2Alert10.2% Minor · n=197
4.09 m ▼4Alert12.7% Minor · n=55
The other 30 stations in this report
StationLevelAlertNext level, 24h
1.49 m ▼1.5Normal29.5% Alert · n=61
6.22 m ▼6.5Normal5.3% Alert · n=38
3.80 ft ▲4Normal25.6% Alert · n=43
14.10 m ▼15Normal4.7% Alert · n=279
2.78 m ▲3Normal6.4% Alert · n=234
2.72 m ▼3Normal32.4% Alert · n=34
2.93 m ▼3.3Normal19% Alert · n=84
8.79 m ▲10Normal1.8% Alert · n=276
3.18 m ▼5Normal0.9% Alert · n=213
2.48 m ▼4Normal5.1% Alert · n=197
1.47 m ▼2.5Normal13% Alert · n=154
1.35 m ▼3Normal5.7% Alert · n=211
1.35 m ▲3Normal2.6% Alert · n=307
2.01 m ▼4.8Normal4.9% Alert · n=102
1.95 m ▼5.5Normal<2% Alert · n=164
1.13 m4Normal0.2% Alert · n=580
1.64 m6Normal<1% Alert · n=537
1.07 m ▼4.4Normal<0% Alert · n=684
1.02 m6.9Normal<0% Alert · n=709
0.54 m5Normal0.2% Alert · n=663
0.41 m4Normal0.5% Alert · n=648
0.39 m4.75Normal2.3% Alert · n=341
0.39 m5Normal<1% Alert · n=274
0.11 m ▼3Normal0.2% Alert · n=619
0.13 m4.5Normal<0% Alert · n=673
0.03 m4Normal0.3% Alert · n=655
0.02 m4.84Normal<1% Alert · n=225
-0.24 m4Normal—
-0.25 m3Normal—
-2.67 m ▲5Normal—