HydroBASINS lev08 watershed · #4080044520
Bassin · #4080044520
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 4 administrative regions : Hokota, Kamisu, Kashima, Ōarai
Sub-basin area
155,5km²
Upstream area
155,5km²
Discharge
0,38m³/s
Mean elev.
16m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- 55.8 km²35.9% of basin
- 39.0 km²25.0% of basin
- 29.9 km²19.2% of basin
- 6.7 km²4.3% of basin
10 intersecting protected areas
Common fishery right area
11.71 km² overlap
Oarai
IUCN VPrefectural Natural Park
2.43 km² overlap
Hasakiminami
IUCN IVPrefectural Wildlife Protection Area
1.26 km² overlap
Ibaraki Prefectural Marine Zone Fisheries Coordination Regulations Article42 (i) of the table
IUCN IVProtected Water Surface
0.71 km² overlap
Kashima
IUCN IVPrefectural Wildlife Protection Area
0.64 km² overlap
Ibaraki Prefectural Marine Zone Fisheries Coordination Regulations Article42 (ii) of the table
IUCN IVProtected Water Surface
0.60 km² overlap
Ibaraki Prefectural Marine Zone Fisheries Coordination Regulations Article42 (iii) of the table
IUCN IVProtected Water Surface
0.39 km² overlap
Koyama fudo
IUCN VPrefectural Nature Conservation Area
0.04 km² overlap
Tamazawa
IUCN VPrefectural Nature Conservation Area
0.02 km² overlap
1 more protected areassorted by overlap area
Hachiman
IUCN VGreen Space Environment Conservation Area(Ibaraki)
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
431 distinct species · 2 439 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 · #4080044520 : 24 espèces reliées par 55 interactions GloBI sur 3 types (connectance 8.7%, filtre Serrano α=0.2). 12 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
1 489mm
Moisture idx (CMI)
0,38
Runoff
761mm/an
PET
919mm
AET
908mm
Mean slope
0,9°
Water table
49cm
Forest
1%
Crops
41%
Urban
67%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)