HydroBASINS lev08 watershed · #7080039770
Bassin de Norwalk 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 2 administrative regions : Fairfield, Westchester
Sub-basin area
187,6km²
Upstream area
187,6km²
Discharge
5m³/s
Mean elev.
138m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- Fairfield178.4 km²95.0% of basin
- WestchesterNew York · United States9.0 km²4.8% of basin
30 intersecting protected areas
Wooster Mountain State Park
IUCN IIIScenic Reserve
2.08 km² overlap
Pine Mountain
IUCN VLocal Conservation Area
0.92 km² overlap
Seth Low Pierrepont State Park
IUCN IIIScenic Reserve
0.57 km² overlap
Mary Evelyn Scott
IUCN VPreserve
0.47 km² overlap
State Resource Management Area
0.29 km² overlap
Weir Farm
IUCN IIINational Historical Park
0.27 km² overlap
Refuge
0.25 km² overlap
Private Conservation
0.20 km² overlap
Town of Wilton 2
IUCN Not AssignedLocal Other or Unknown
0.15 km² overlap
21 more protected areassorted by overlap area
Spectacle Swamp
IUCN VLocal Conservation Area
0.14 km² overlap
Town of Danbury 1
IUCN Not AssignedLocal Other or Unknown
0.11 km² overlap
Private Conservation
0.11 km² overlap
Private Conservation
0.10 km² overlap
Private Conservation
0.10 km² overlap
Private Conservation
0.09 km² overlap
Farm Ridge
IUCN VOpen Space
0.08 km² overlap
Private Conservation
0.07 km² overlap
Private Conservation
0.07 km² overlap
Private Conservation
0.07 km² overlap
Private Conservation
0.07 km² overlap
Private Conservation
0.06 km² overlap
Private Conservation
0.06 km² overlap
Private Conservation
0.04 km² overlap
Private Conservation
0.04 km² overlap
Private Conservation
0.04 km² overlap
Private Conservation
0.04 km² overlap
Private Conservation
0.03 km² overlap
Glendinning Setaside
IUCN VPrivate Conservation
0.03 km² overlap
Private Conservation
0.03 km² overlap
Private Conservation
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 467 distinct species · 277 966 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 Norwalk River : 25 espèces reliées par 73 interactions GloBI sur 4 types (connectance 11.6%, 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°
9,9°C
Annual rain
1 228mm
Moisture idx (CMI)
0,21
Runoff
844mm/an
PET
972mm
AET
811mm
Mean slope
3,4°
Water table
380cm
Forest
86%
Crops
0%
Urban
37%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)