HydroBASINS lev08 watershed · #5080030660
Bassin de Gumaca River
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 10 administrative regions : Alabat, Atimonan, Calauag, Gumaca, Lopez +5
Sub-basin area
537,9km²
Upstream area
537,9km²
Discharge
21,36m³/s
Mean elev.
55m
Administrative coverage
10 dept-equivalent regions (GADM L2)
- 102.6 km²19.1% of basin
- Quezon80.9 km²15.1% of basin
- 78.6 km²14.7% of basin
- 59.4 km²11.1% of basin
- 57.9 km²10.8% of basin
- 52.7 km²9.8% of basin
- Plaridel19.0 km²3.5% of basin
- 18.4 km²3.4% of basin
2 intersecting protected areas
Island of Polilio, Alabat, Cabelete, Jomalig, Patnanongan, Kalotkot, Kalongkooan, Palasan, Calabao, Icol and San Rafael Mangrove Swamp Forest Reserve
IUCN Not AssignedMangrove Swamp Forest Reserve
4.66 km² overlap
Alabat Watershed Forest Reserve
IUCN Not AssignedWatershed Forest Reserve
3.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
161 distinct species · 264 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 Gumaca River : 25 espèces reliées par 22 interactions GloBI sur 3 types (connectance 5.8%, filtre Serrano α=0.2). 3 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°
26,8°C
Annual rain
2 823mm
Moisture idx (CMI)
0,47
Runoff
2 287mm/an
PET
1 495mm
AET
1 365mm
Mean slope
5,3°
Water table
218cm
Forest
44%
Crops
17%
Urban
18%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)