HydroBASINS lev08 watershed · #4080448240
Bassin de 小坂川
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 7 administrative regions : Hirakawa, Kazuno, Kosaka, Shingō, Takko +2
Sub-basin area
423,4km²
Upstream area
423,5km²
Discharge
11,93m³/s
Mean elev.
448m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 225.4 km²53.2% of basin
- 169.8 km²40.1% of basin
- 22.1 km²5.2% of basin
- 3.5 km²0.8% of basin
- 2.7 km²0.6% of basin
- 0.4 km²0.1% of basin
- 0.1 km²0.0% of basin
11 intersecting protected areas
Ouu Mountain Range
IUCN VGreen Corridor
19.82 km² overlap
Shirakami Hakkoda
IUCN VGreen Corridor
19.18 km² overlap
Towada hachimantai
IUCN IINational Park
11.36 km² overlap
Oyu
IUCN IVPrefectural Wildlife Protection Area
8.64 km² overlap
Naganotaira
IUCN VRestricted Development Area(Aomori)
3.42 km² overlap
Shirahagitai
IUCN VRestricted Development Area(Aomori)
3.11 km² overlap
Sawa
IUCN IVPrefectural Wildlife Protection Area
0.22 km² overlap
Mantani
IUCN IVPrefectural Wildlife Protection Area
0.05 km² overlap
Prefectural Natural Park
0.00 km² overlap
2 more protected areassorted by overlap area
Towada
IUCN IVNational Wildlife Protection Area
0.00 km² overlap
Towadako oyobi oirase keiryuu
IUCN IIINational Natural Monument
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 142 distinct species · 3 906 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 16 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 小坂川 : 12 espèces reliées par 25 interactions GloBI sur 3 types (connectance 16.3%, filtre Serrano α=0.2). 6 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°
8,1°C
Annual rain
1 471mm
Moisture idx (CMI)
0,45
Runoff
890mm/an
PET
805mm
AET
776mm
Mean slope
10,5°
Water table
366cm
Forest
94%
Crops
1%
Urban
1%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)