HydroBASINS lev08 watershed · #7080764200
Bassin de San Marcos 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 2 administrative regions : Caldwell, Gonzales
Sub-basin area
291,3km²
Upstream area
3 538km²
Discharge
25,96m³/s
Mean elev.
119m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Plum Creek1009 km²
- Bassin de San Marcos River274 km²
2 dept-equivalent regions (GADM L2)
- 271.1 km²93.2% of basin
- Caldwell19.9 km²6.8% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 157 distinct species · 106 110 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 San Marcos River : 33 espèces reliées par 78 interactions GloBI sur 4 types (connectance 8.6%, filtre Serrano α=0.2). 10 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°
20,1°C
Annual rain
874mm
Moisture idx (CMI)
-0,43
Runoff
263mm/an
PET
1 537mm
AET
739mm
Mean slope
1,0°
Water table
92cm
Forest
5%
Crops
31%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)