HydroBASINS lev08 watershed · #7080878050
Bassin de Río Amatillo o Sirama
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 : Bolívar, Comacarán, Jocoro, Pasaquina, San Alejo +5
Sub-basin area
320,5km²
Upstream area
320,5km²
Discharge
5,9m³/s
Mean elev.
170m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
10 dept-equivalent regions (GADM L2)
- San AlejoLa Unión · El Salvador145.4 km²45.5% of basin
- BolívarLa Unión · El Salvador49.1 km²15.4% of basin
- YucuaiquínLa Unión · El Salvador37.2 km²11.7% of basin
- San JoséLa Unión · El Salvador36.2 km²11.3% of basin
- PasaquinaLa Unión · El Salvador24.5 km²7.7% of basin
- YayantiqueLa Unión · El Salvador13.7 km²4.3% of basin
- 8.0 km²2.5% of basin
- UluazapaSan Miguel · El Salvador3.4 km²1.1% of basin
2 moreFull L2 list
- Comacarán0.9 km² · 0.3%
- Santa Rosa de Lima0.8 km² · 0.3%
3 intersecting protected areas
El Socorro
IUCN Not ReportedNatural Area
0.76 km² overlap
Santa Elena
IUCN Not ReportedNatural Protected Area
0.47 km² overlap
San Lucas o Palo Galán
IUCN Not ReportedNatural Protected Area
0.27 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
140 distinct species · 826 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 23 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 Río Amatillo o Sirama : 20 espèces + 4 bulles famille, 18 interactions GloBI documentées sur 3 types (connectance 6.5%, filtre Serrano α=0.2). Les 4 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
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
1 770mm
Moisture idx (CMI)
-0,05
Runoff
620mm/an
PET
1 856mm
AET
1 161mm
Mean slope
6,0°
Water table
267cm
Forest
42%
Crops
35%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)