HydroBASINS lev08 watershed · #4080019760
Bassin de Sungai Semerak
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 6 administrative regions : Bachok, Besut, Kota Bharu, Kuala Krai, Machang +1
Sub-basin area
691,9km²
Upstream area
691,9km²
Discharge
37,63m³/s
Mean elev.
81m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 389.5 km²56.5% of basin
- 107.4 km²15.6% of basin
- 71.5 km²10.4% of basin
- 61.8 km²9.0% of basin
- 53.9 km²7.8% of basin
- 1.6 km²0.2% of basin
1 intersecting protected areas
Chabang Tongkat
IUCN VIForest Reserve
25.93 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
298 distinct species · 857 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Sungai Semerak : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 23 interactions GloBI sur 2 types (connectance 6.1%, filtre Serrano α=0.2). 5 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°
26,6°C
Annual rain
2 913mm
Moisture idx (CMI)
0,48
Runoff
1 730mm/an
PET
1 524mm
AET
1 413mm
Mean slope
4,0°
Water table
132cm
Forest
18%
Crops
48%
Urban
28%
Protected
20%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)