HydroBASINS lev08 watershed · #7080624260
Bassin de Blackwater 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 11 administrative regions : Dinwiddie, Franklin, Gates, Hertford, Isle of Wight +6
Sub-basin area
2 173,9km²
Upstream area
2 173,9km²
Discharge
31,73m³/s
Mean elev.
30m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
11 dept-equivalent regions (GADM L2)
- Surry425.4 km²19.6% of basin
- 423.6 km²19.5% of basin
- 404.0 km²18.6% of basin
- Suffolk338.3 km²15.6% of basin
- 273.1 km²12.6% of basin
- Sussex231.9 km²10.7% of basin
- 38.9 km²1.8% of basin
- 19.5 km²0.9% of basin
17 intersecting protected areas
South Quay Sandhills
IUCN VState Natural Area Preserve
11.46 km² overlap
Piney Grove
IUCN VGrove
7.77 km² overlap
Big Woods
IUCN VPrivate Conservation Land
7.06 km² overlap
Big Woods
IUCN VWildlife Management Area
6.30 km² overlap
Antioch Pines
IUCN VState Natural Area Preserve
4.68 km² overlap
Blackwater Sandhills DCR
IUCN VState Natural Area Preserve
3.36 km² overlap
Dendron Swamp
IUCN VState Natural Area Preserve
2.57 km² overlap
The Nature Conservancy
IUCN VEasement
1.67 km² overlap
Blackwater Ecological
IUCN VState Natural Area Preserve
1.31 km² overlap
8 more protected areassorted by overlap area
South Quay Sandhills
IUCN VState Natural Area Preserve
1.16 km² overlap
Sur-Vof-4059
IUCN Not AssignedConservation Easement
0.99 km² overlap
South Quay Sandhills
IUCN VState Natural Area Preserve
0.62 km² overlap
Blackwater River
IUCN VPrivate Conservation Land
0.29 km² overlap
Tnc
IUCN VEasement
0.26 km² overlap
Reserve Program
0.08 km² overlap
Reserve Program
0.03 km² overlap
South Quay Sandhills
IUCN VState Natural Area Preserve
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 250 distinct species · 99 410 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Blackwater River : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 82 interactions GloBI sur 4 types (connectance 10.5%, filtre Serrano α=0.2). 10 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 160mm
Moisture idx (CMI)
-0,04
Runoff
467mm/an
PET
1 211mm
AET
928mm
Mean slope
0,8°
Water table
24cm
Forest
83%
Crops
22%
Urban
1%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)