Dunamale Aththanagalu Oya · අත්තනගලු ඔය ජල මට්ටම

Above minor flood level now and could reach major flood level around 4 pm this afternoon (in about 10 hours) (about 35% chance).

ප්‍රකාශිත අගය 4.74 m (අනතුරු ඇඟවීම 3.3 m, සුළු ගංවතුර 4.4 m, ප්‍රධාන ගංවතුර 5.5 m)

• ප්‍රධාන ගංවතුර (18.0 ft): විය හැක, 10 න් 3ක් පමණ, ප.ව. 4:02 පමණ සිට

වැටුණු වැසි

මෙම මාපකයේ පසුගිය පැය 3 තුළ මි.මී. 0.0, පසුගිය පැය 24 තුළ මි.මී. 97 (තද වැසි) (මෙම ගඟට තද)

වැසි පුරෝකථනය

ජලඛණ්ඩය මත ඉදිරි පැය 24 තුළ මි.මී. 7.9 (සැහැල්ලු වැසි). කාලගුණ ආකෘතියේ ඇස්තමේන්තුවකි.

ජලඛණ්ඩය මත චන්ද්‍රිකා වර්ෂාව: පසුගිය පැය 6 තුළ මි.මී. 2.3, පසුගිය පැය 24 තුළ මි.මී. 118.5 (පෙ.ව. 5:30 දක්වා). එය මානයන්ට වඩා වෙනස් විය හැක. GSMaP data by Japan Aerospace Exploration Agency (JAXA)

• · Part of the range is above the highest level this model has seen (12.5 ft); treat it as a rough guide.

• මෙය ගණනය කරන ආකාරය
• · Latest level at Dunamale and recent change. No gauge sits upstream of it (or none reports in step with it), so the catchment rain is its upstream signal.
• · Forecast model estimate of catchment rain (Open-Meteo, area average over 4 grid cells above Dunamale): 66 mm modelled for the last 24 hours, 8 mm forecast for the next 24 hours, with ECMWF ensemble spread.
• · The 1, 3, 6, 12, 24 hour steps use this gauge's own recent changes and the other gauges on the river (fitted to about 11 months of hourly readings, including the November 2025 Ditwah floods); where this was tested against 'level stays the same' it missed by less.
• · The 6, 12, 24 hour steps read the rain the satellite measured over Dunamale's catchment (JAXA GSMaP, corrected for how it reads here), with rain beside the gauge and rain on the channels upstream timed separately (about 5 h from beside the gauge). Tested storm by storm it was closer than the version that reads the weather model's rain.
• · Heavy rain upstream is part of the 1, 6, 12, 24 hour steps: rain that has fallen or is forecast over the catchment above Dunamale raises the level, and the top of the range allows for the heavier forecast rain. Tested storm by storm (leaving each storm out, Ditwah included) it was closer than the river's own trend alone.