HydroBASINS lev08 watershed · #2080048930
Bassin de River Yar
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 : Bournemouth, Christchurch and Po, Isle of Wight, NA
Sub-basin area
848,1km²
Upstream area
848,1km²
Discharge
2,99m³/s
Mean elev.
40m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom413.4 km²48.6% of basin
- Isle of WightEngland · United Kingdom387.3 km²45.5% of basin
- NAEngland · United Kingdom11.4 km²1.3% of basin
- Bournemouth, Christchurch and PoEngland · United Kingdom0.0 km²0.0% of basin
30 intersecting protected areas
New Forest
IUCN VNational Park
342.07 km² overlap
Isle Of Wight
IUCN VArea of Outstanding Natural Beauty
191.48 km² overlap
The New Forest
IUCN Not ReportedEmerald Network
185.10 km² overlap
The New Forest
IUCN IVSite of Special Scientific Interest
183.70 km² overlap
The New Forest
IUCN VWetland of International Importance (Ramsar Site)
180.90 km² overlap
New Forest
IUCN Not ReportedEmerald Network
180.82 km² overlap
Solent and Southampton Water
IUCN Not ReportedEmerald Network
39.86 km² overlap
Solent and Southampton Water
IUCN Not ReportedWetland of International Importance (Ramsar Site)
38.75 km² overlap
Isle of Wight Biosphere
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
34.29 km² overlap
21 more protected areassorted by overlap area
Tennyson
IUCN VHeritage Coast
32.95 km² overlap
Solent Maritime
IUCN Not ReportedEmerald Network
29.82 km² overlap
Solent and Dorset Coast
IUCN Not ReportedEmerald Network
29.18 km² overlap
Solent and Dorset Coast
IUCN Not ReportedSpecial Protection Area (Birds Directive)
29.17 km² overlap
Solent and Southampton Water
IUCN Not ReportedMarine Protected Area (OSPAR)
22.95 km² overlap
Hamstead
IUCN VHeritage Coast
20.58 km² overlap
Solent Maritime
IUCN Not ReportedMarine Protected Area (OSPAR)
17.59 km² overlap
South Wight Maritime
IUCN Not ReportedEmerald Network
15.20 km² overlap
South Wight Maritime
IUCN Not ReportedMarine Protected Area (OSPAR)
12.39 km² overlap
North Solent
IUCN IVSite of Special Scientific Interest
11.54 km² overlap
Site of Special Scientific Interest
10.11 km² overlap
North Solent
IUCN IVNational Nature Reserve
9.19 km² overlap
Site of Special Scientific Interest
6.24 km² overlap
Yarmouth to Cowes
IUCN IVMarine Conservation Zone
6.20 km² overlap
Newtown Harbour
IUCN IVSite of Special Scientific Interest
6.16 km² overlap
Hythe to Calshot Marshes
IUCN IVSite of Special Scientific Interest
5.37 km² overlap
Bembridge
IUCN IVMarine Conservation Zone
5.29 km² overlap
Isle of Wight Downs
IUCN Not ReportedEmerald Network
4.58 km² overlap
Site of Special Scientific Interest
4.57 km² overlap
Brading Marshes
IUCN IVNature Reserve
3.85 km² overlap
Newtown
IUCN VNature Reserve
3.50 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
12 581 distinct species · 1 201 357 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 River Yar : 26 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 67 interactions GloBI sur 3 types (connectance 12.7%, filtre Serrano α=0.2). 7 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°
10,3°C
Annual rain
807mm
Moisture idx (CMI)
0,12
Runoff
513mm/an
PET
713mm
AET
536mm
Mean slope
2,3°
Water table
154cm
Forest
8%
Crops
30%
Urban
16%
Protected
67%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)