HydroBASINS lev08 watershed · #7080048330
Bassin de San Bernard 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 6 administrative regions : Austin, Brazoria, Colorado, Fort Bend, Matagorda +1
Sub-basin area
2 584,8km²
Upstream area
2 584,9km²
Discharge
31,28m³/s
Mean elev.
42m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 713.3 km²27.6% of basin
- 584.6 km²22.6% of basin
- 450.2 km²17.4% of basin
- 443.3 km²17.2% of basin
- 372.9 km²14.4% of basin
- 16.9 km²0.7% of basin
12 intersecting protected areas
San Bernard
IUCN IVNational Wildlife Refuge
55.52 km² overlap
Marine Protected Area
53.62 km² overlap
Attwater Prairie Chicken
IUCN IVNational Wildlife Refuge
42.77 km² overlap
Marine Protected Area
10.78 km² overlap
Justin Hurst
IUCN VWildlife Management Area
10.78 km² overlap
Nannie M. Stringfellow
IUCN VWildlife Management Area
5.35 km² overlap
Private Conservation Land
5.16 km² overlap
D.R. Wintermann
IUCN VWildlife Management Area
1.01 km² overlap
Us-Tx-132-1
IUCN Not AssignedConservation Easement
1.00 km² overlap
3 more protected areassorted by overlap area
Us-Tx-73-1
IUCN Not AssignedConservation Easement
0.41 km² overlap
Us-Tx-142-4
IUCN Not AssignedConservation Easement
0.38 km² overlap
US-TX-116-1 Mitigation or Eco-Asset Project
IUCN Not AssignedMitigation
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 895 distinct species · 328 733 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Bernard River : 26 espèces reliées par 74 interactions GloBI sur 3 types (connectance 12.4%, filtre Serrano α=0.2). 9 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°
20,2°C
Annual rain
1 108mm
Moisture idx (CMI)
-0,24
Runoff
368mm/an
PET
1 464mm
AET
936mm
Mean slope
0,2°
Water table
18cm
Forest
17%
Crops
40%
Urban
0%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)