HydroBASINS lev08 watershed · #7080712340
Bassin de Twelvemile Bayou
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 : Bossier, Caddo, Harrison, Panola
Sub-basin area
832,2km²
Upstream area
9 107,5km²
Discharge
112,18m³/s
Mean elev.
79m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Black Bayou1035 km²
- Bassin de Big Cypress Bayou78 km²
4 dept-equivalent regions (GADM L2)
- 596.2 km²71.7% of basin
- Harrison234.7 km²28.2% of basin
- Panola0.7 km²0.1% of basin
- 0.0 km²0.0% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 316 distinct species · 146 637 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Twelvemile Bayou : 26 espèces reliées par 72 interactions GloBI sur 3 types (connectance 10.8%, 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°
18,1°C
Annual rain
1 219mm
Moisture idx (CMI)
-0,13
Runoff
390mm/an
PET
1 405mm
AET
1 003mm
Mean slope
1,0°
Water table
60cm
Forest
75%
Crops
12%
Urban
6%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)