Ratnapura Kalu Ganga · කළු ගඟ ජල මට්ටම

Above minor flood level now and could reach major flood level around 10 am this morning (in about 6 hours) (about 55% chance).

ප්‍රකාශිත අගය 8.68 m (අනතුරු ඇඟවීම 5.2 m, සුළු ගංවතුර 7.5 m, ප්‍රධාන ගංවතුර 9.5 m)

මෙම සතියේ ගංගා ජල ප්‍රවාහය ඉහළ යා හැක.

• ප්‍රධාන ගංවතුර (31.2 ft): විය හැක, 10 න් 5ක් පමණ, පෙ.ව. 10:04 පමණ සිට

වැටුණු වැසි

මෙම මාපකයේ පසුගිය පැය 3 තුළ මි.මී. 0.0, පසුගිය පැය 24 තුළ මි.මී. 129 (ඉතා තද වැසි)

වැසි පුරෝකථනය

ජලඛණ්ඩය මත ඉදිරි පැය 24 තුළ මි.මී. 22 (මධ්‍යස්ථ වැසි). කාලගුණ ආකෘතියේ ඇස්තමේන්තුවකි.

ජලඛණ්ඩය මත චන්ද්‍රිකා වර්ෂාව: පසුගිය පැය 6 තුළ මි.මී. 20.6, පසුගිය පැය 24 තුළ මි.මී. 105.6 (පෙ.ව. 3:30 දක්වා). එය මානයන්ට වඩා වෙනස් විය හැක. GSMaP data by Japan Aerospace Exploration Agency (JAXA)

• · Outlook: the GloFAS global flood model has river flow at 461 m3/s in its highest member within 7 days, above the 1-in-20 level (285 m3/s). This is a heads-up only; it does not change the levels above.
• · Part of the range is above the highest level this model has seen (20.7 ft); treat it as a rough guide.
• · Some rain is forecast over the catchment: about 22 mm in the next 24 hours (ensemble range 8 to 34 mm).

• මෙය ගණනය කරන ආකාරය
• · Latest level at Rathnapura 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 6 grid cells above Rathnapura): 54 mm modelled for the last 24 hours, 22 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.
• · Heavy rain upstream is part of the 1, 3, 6, 12, 24 hour steps: rain that has fallen or is forecast over the catchment above Rathnapura 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.