කලින් predict කරපු විදිහට අතුරුගිරියේත් පහල area වලට වතුර එනවා වගේ. මීට වඩා ගොඩක් වැඩි වෙන්නේ නැති වෙයි ගොඩක් දුරට.
KADUWELA – 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:
2–5 ft (0.6–1.5 m)
Kelanimulla area:
4–8 ft (1.2–2.5 m) (highest risk zone in Kaduwela)
Athurugiriya Road lower bends:
1–3 ft (0.3–0.9 m)
Kaduwela Bridge / Highway underpass pockets:
2–4 ft (0.6–1.2 m)
Why Kaduwela will flood
Water moving downstream from Pugoda → Hanwella → Kaduwela
Low elevation (5–8 m in many parts)
Backflow from canals + Kelani overflow
Historical flooding (2016/2021/2024) shows Kaduwela is a major “spread basin”
Timing
Flood levels may increase for the next 6–12 hours, because Mapitigama is still rising.
MALABE – 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):
0–1 ft (0–0.3 m) — surface water only
Near waterways / low pocket areas:
1–2 ft (0.3–0.6 m)
Malabe Town (centre):
Mostly safe — may see minor road flooding
Arangala, Chandrika Kumaratunga Mawatha low spots:
1–3 ft possible if drainage chokes
Koswatta → 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 → Malabe corridor
So Malabe’s issue is drainage backflow, not river overflow.