Ontologia

HydroBASINS lev08 watershed · #2080391260

Bassin de River Lea

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 6 administrative regions : Luton, NA

6% lakePfafstetter: 23303820

Sub-basin area

1 387,3km²

Upstream area

1 387,4km²

Discharge

12,98m³/s

Mean elev.

87m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de River Roding1139 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

6 dept-equivalent regions (GADM L2)

30 intersecting protected areas

  • Chilterns

    IUCN V

    Area of Outstanding Natural Beauty

    21.99 km² overlap

  • Epping Forest

    IUCN IV

    Site of Special Scientific Interest

    7.69 km² overlap

  • Epping Forest

    IUCN Not Reported

    Emerald Network

    7.63 km² overlap

  • Lee Valley

    IUCN Not Reported

    Wetland of International Importance (Ramsar Site)

    4.51 km² overlap

  • Lee Valley

    IUCN Not Reported

    Emerald Network

    4.51 km² overlap

  • Hatfield Forest

    IUCN IV

    Site of Special Scientific Interest

    4.11 km² overlap

  • Hatfield Forest

    IUCN V

    Nature Reserve

    3.98 km² overlap

  • Hatfield Forest

    IUCN IV

    National Nature Reserve

    3.93 km² overlap

  • Chingford Reservoirs

    IUCN IV

    Site of Special Scientific Interest

    3.87 km² overlap

21 more protected areas

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

12 426 distinct species · 3 127 048 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

3 127 048 obs · 45 cellules
Obs. / cellule
≥ 529 182
178 406–529 181
76 220–178 405
40 228–76 219
< 40 228

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Ecological tissue

Sample of 38 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).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de River Lea : 28 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 96 interactions GloBI sur 6 types (connectance 13.7%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
96
Connectance
0.137
Patrimoniales
1
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

10,0°C

Annual rain

629mm

Moisture idx (CMI)

-0,11

Runoff

287mm/an

PET

706mm

AET

513mm

Mean slope

1,7°

Water table

131cm

Forest

0%

Crops

29%

Urban

34%

Protected

4%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)