HydroBASINS lev08 watershed · #4080583010
Bassin de 宿谷川
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 19 administrative regions : Chichibu, Hannō, Hatoyama, Hidaka, Higashichichibu +14
Sub-basin area
442,6km²
Upstream area
442,6km²
Discharge
8,3m³/s
Mean elev.
197m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
19 dept-equivalent regions (GADM L2)
- 54.6 km²12.3% of basin
- 54.1 km²12.2% of basin
- OgawaSaitama · Japan47.7 km²10.8% of basin
- HigashimatsuyamaSaitama · Japan39.8 km²9.0% of basin
- 39.7 km²9.0% of basin
- 39.2 km²8.9% of basin
- HigashichichibuSaitama · Japan35.7 km²8.1% of basin
- HidakaSaitama · Japan34.1 km²7.7% of basin
16 intersecting protected areas
Kuroyama
IUCN VPrefectural Natural Park
98.93 km² overlap
Okumusashi
IUCN VPrefectural Natural Park
75.86 km² overlap
Nagatoro tamayodo
IUCN VPrefectural Natural Park
42.24 km² overlap
Hiki kyuryo
IUCN VPrefectural Natural Park
31.79 km² overlap
Dodairasan
IUCN IVPrefectural Wildlife Protection Area
6.30 km² overlap
Tamagawa mura kawanohiroba
IUCN IVPrefectural Wildlife Protection Area
0.74 km² overlap
Buko
IUCN VPrefectural Natural Park
0.39 km² overlap
Ogawa genki plaza
IUCN IVPrefectural Wildlife Protection Area
0.33 km² overlap
Hagigaoka shogakko
IUCN IVPrefectural Wildlife Protection Area
0.29 km² overlap
7 more protected areassorted by overlap area
Ogose chugakko
IUCN IVPrefectural Wildlife Protection Area
0.19 km² overlap
Ogawanishi chugakko
IUCN IVPrefectural Wildlife Protection Area
0.16 km² overlap
Tsurugashimashi takakura
IUCN VHometown green landscape(Saitama)
0.09 km² overlap
Special green space conservation districts
0.04 km² overlap
Naguri genki plaza
IUCN IVPrefectural Wildlife Protection Area
0.03 km² overlap
Tokigawa machi dogenbira
IUCN VPrefectural Nature Conservation Area
0.02 km² overlap
HondaWoods Minamiyorii Tsudoi no Sato
IUCN Not ApplicableOECM
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 058 distinct species · 15 075 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 宿谷川 : 27 espèces reliées par 60 interactions GloBI sur 4 types (connectance 10.1%, filtre Serrano α=0.2). 8 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°
13,6°C
Annual rain
1 380mm
Moisture idx (CMI)
0,24
Runoff
589mm/an
PET
1 045mm
AET
1 000mm
Mean slope
7,9°
Water table
253cm
Forest
57%
Crops
8%
Urban
45%
Protected
57%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)