āļ
āļāˇāļģāˇāļāˇāļģāˇāļē āˇāļēāˇāˇāˇ āļ´āˇāļŊāļ¸ āļŊāļ
āļāļŊāˇāļąāˇ predict āļāļģāļ´āˇ āˇāˇāļ¯āˇāˇāļ§ āļ
āļāˇāļģāˇāļāˇāļģāˇāļēāˇāļ⎠āļ´āˇāļŊ area āˇāļŊāļ§ āˇāļāˇāļģ āļāļąāˇāˇ āˇāļāˇ. āļ¸āˇāļ§ āˇāļŠāˇ āļāˇāļŠāļ⎠āˇāˇāļŠāˇ āˇāˇāļąāˇāļąāˇ āļąāˇāļ⎠āˇāˇāļē⎠āļāˇāļŠāļ⎠āļ¯āˇāļģāļ§.
KADUWELA â What Will Happen
Kaduwela sits directly in the Kelani flood-spread corridor, especially the low ground between Biyagama, Kelanimulla, and Orugodawatta.
Expected Flood Depths
Kaduwela Town Lowlands:
2â5 ft (0.6â1.5 m)
Kelanimulla area:
4â8 ft (1.2â2.5 m) (highest risk zone in Kaduwela)
Athurugiriya Road lower bends:
1â3 ft (0.3â0.9 m)
Kaduwela Bridge / Highway underpass pockets:
2â4 ft (0.6â1.2 m)
Why Kaduwela will flood
Water moving downstream from Pugoda â Hanwella â Kaduwela
Low elevation (5â8 m in many parts)
Backflow from canals + Kelani overflow
Historical flooding (2016/2021/2024) shows Kaduwela is a major âspread basinâ
Timing
Flood levels may increase for the next 6â12 hours, because Mapitigama is still rising.
MALABE â What Will Happen
Malabe is higher in elevation compared to Kaduwela, but drainage connects downward into Kolonnawa and Kaduwela basins.
Expected Flood Depths
Most of Malabe (higher ground):
0â1 ft (0â0.3 m) â surface water only
Near waterways / low pocket areas:
1â2 ft (0.3â0.6 m)
Malabe Town (centre):
Mostly safe â may see minor road flooding
Arangala, Chandrika Kumaratunga Mawatha low spots:
1â3 ft possible if drainage chokes
Koswatta â Rajagiriya corridor:
Flooding likely because water pushes towards Kolonnawa LP basin
Important:
Malabe does not flood from Kelani directly, but: Drainage lines push water downhill into Kolonnawa Basin
When Kolonnawa floods heavily, water backs up toward Rajagiriya â Malabe corridor
So Malabeâs issue is drainage backflow, not river overflow.