HydroBASINS lev08 watershed · #4080049150
Bassin de Irrigation Canal
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 8 administrative regions : Anamaduwa, Arachchikattuwa PS, Kotavehera, Mahakumbukkadawala, Mundalama +3
Sub-basin area
555,6km²
Upstream area
555,6km²
Discharge
9,73m³/s
Mean elev.
35m
Administrative coverage
8 dept-equivalent regions (GADM L2)
- MahakumbukkadawalaPuttalam · Sri Lanka151.4 km²27.4% of basin
- Arachchikattuwa PSPuttalam · Sri Lanka109.2 km²19.7% of basin
- 56.6 km²10.2% of basin
- 54.4 km²9.8% of basin
- RasnayakapuraKurunegala · Sri Lanka54.0 km²9.8% of basin
- 52.8 km²9.5% of basin
- KotaveheraKurunegala · Sri Lanka41.0 km²7.4% of basin
- 33.7 km²6.1% of basin
4 intersecting protected areas
Anawilundawa
IUCN IVSanctuary
8.16 km² overlap
Ambanmukalana
IUCN IbReserved Forest
5.07 km² overlap
Nakele
IUCN IbReserved Forest
0.66 km² overlap
Meegahakele
IUCN IbReserved Forest
0.09 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
468 distinct species · 18 472 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Irrigation Canal : 26 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 31 interactions GloBI sur 4 types (connectance 5.9%, filtre Serrano α=0.2). 7 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
27,7°C
Annual rain
1 377mm
Moisture idx (CMI)
-0,13
Runoff
560mm/an
PET
1 581mm
AET
1 109mm
Mean slope
0,7°
Water table
55cm
Forest
2%
Crops
35%
Urban
4%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)