HydroBASINS lev08 watershed · #7080041460
Bassin de Cedar Run
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 8 administrative regions : Fairfax, Fairfax City, Fauquier, Loudoun, Manassas +3
Sub-basin area
1 542,2km²
Upstream area
1 542,5km²
Discharge
20,69m³/s
Mean elev.
109m
Administrative coverage
8 dept-equivalent regions (GADM L2)
- 615.4 km²39.9% of basin
- 543.1 km²35.2% of basin
- 281.8 km²18.3% of basin
- 67.9 km²4.4% of basin
- 25.8 km²1.7% of basin
- 7.2 km²0.5% of basin
- 1.1 km²0.1% of basin
- Stafford0.7 km²0.0% of basin
15 intersecting protected areas
Bull Run Mountains
IUCN VState Natural Area Preserve
7.91 km² overlap
Elklick
IUCN IIIPreserve
5.49 km² overlap
Cub Run Stream Valley
IUCN IIIPark
3.64 km² overlap
Johnny Moore Stream Valley
IUCN IIIPark
1.44 km² overlap
Rocky Run Stream Valley
IUCN IIIPark
1.29 km² overlap
Elklick Woodlands
IUCN VState Natural Area Preserve
0.92 km² overlap
Piney Branch Stream Valley
IUCN IIIPark
0.75 km² overlap
Flatlick Stream Valley
IUCN IIIPark
0.38 km² overlap
VDOT
IUCN IVWetlands Bank
0.36 km² overlap
6 more protected areassorted by overlap area
Frog Branch Stream Valley
IUCN IIIPark
0.31 km² overlap
Broad Run
IUCN VPrivate Conservation Land
0.23 km² overlap
Sandy Run Stream Valley
IUCN IIIPark
0.16 km² overlap
Watery Mountains
IUCN VPrivate Conservation Land
0.12 km² overlap
Pinebrook
IUCN Not AssignedConservation Easement
0.04 km² overlap
Rocky Run Stream Valley Park II
IUCN IIIPark
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 042 distinct species · 1 634 066 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 Cedar Run : 24 espèces reliées par 81 interactions GloBI sur 4 types (connectance 12.9%, 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°
12,7°C
Annual rain
1 014mm
Moisture idx (CMI)
-0,12
Runoff
426mm/an
PET
1 154mm
AET
836mm
Mean slope
2,0°
Water table
130cm
Forest
75%
Crops
16%
Urban
24%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)