HydroBASINS lev08 watershed · #7080013460
Bassin de Arroyo Valle
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 5 administrative regions : Alameda, Contra Costa, San Joaquin, Santa Clara, Stanislaus
Sub-basin area
1 897,6km²
Upstream area
1 897,6km²
Discharge
6,62m³/s
Mean elev.
454m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- 1181.0 km²62.2% of basin
- 558.3 km²29.4% of basin
- 157.7 km²8.3% of basin
- 0.9 km²0.0% of basin
- 0.5 km²0.0% of basin
30 intersecting protected areas
Ohlone Regional
IUCN VWilderness
36.62 km² overlap
Sunol Regional
IUCN VWilderness
27.88 km² overlap
Eden Landing
IUCN VEcological Reserve
20.31 km² overlap
Easement
7.94 km² overlap
Preserve
7.29 km² overlap
Brushy Peak Regional
IUCN VPreserve
6.86 km² overlap
Mount Hamilton Megasite
IUCN VEasement
3.65 km² overlap
Gale Ranch
IUCN Not AssignedConservation Easement
3.56 km² overlap
Blue Oak Ranch
IUCN VReserve
3.40 km² overlap
21 more protected areassorted by overlap area
Doolan Canyon Regional
IUCN VPreserve
3.15 km² overlap
Hayward
IUCN Not AssignedShoreline
3.12 km² overlap
Bishop Ranch Regional
IUCN VRegional Open Space
3.05 km² overlap
Tri-Valley Conservancy
IUCN Not AssignedEasement
2.63 km² overlap
Wilderness
2.16 km² overlap
Eagle Ridge
IUCN Not AssignedPreserve
2.08 km² overlap
Mission Peak Regional
IUCN VPreserve
1.39 km² overlap
Blackbird Valley
IUCN VConservation Easement
1.19 km² overlap
Horseshoe Canyon Mine
IUCN VConservation Easement
0.91 km² overlap
Intervening Offsite -Jones Property
IUCN Not AssignedConservation Easement
0.73 km² overlap
Local Conservation Area
0.61 km² overlap
Schaefer Ranch
IUCN Not AssignedConservation Easement
0.52 km² overlap
Curry Canyon Ranch
IUCN VPrivate Conservation
0.49 km² overlap
Old Ranch
IUCN Not AssignedConservation Easement
0.43 km² overlap
Highland Springs
IUCN VPrivate Conservation
0.42 km² overlap
Wendt Ranch
IUCN Not AssignedConservation Easement
0.33 km² overlap
Open Space
0.30 km² overlap
Chabot - Garin
IUCN VTrail Corridor
0.26 km² overlap
Marine Protected Area
0.20 km² overlap
National Wildlife Refuge
0.19 km² overlap
City
IUCN Not AssignedPark
0.09 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 307 distinct species · 1 734 839 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Arroyo Valle : 22 espèces reliées par 82 interactions GloBI sur 4 types (connectance 15.5%, filtre Serrano α=0.2). 11 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°
14,5°C
Annual rain
516mm
Moisture idx (CMI)
-0,59
Runoff
139mm/an
PET
1 277mm
AET
437mm
Mean slope
9,4°
Water table
459cm
Forest
53%
Crops
4%
Urban
18%
Protected
10%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)