HydroBASINS lev08 watershed · #2080429650
Bassin de la Somme Canalisée
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 1 administrative regions : Somme
Sub-basin area
404km²
Upstream area
4 883,3km²
Discharge
62,27m³/s
Mean elev.
88m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Selle705 km²
- Bassin de la Basse Selle38 km²
1 dept-equivalent regions (GADM L2)
- 405.4 km²100.0% of basin
59 communes (GADM L5)Available for FRA, RWA
- Molliens-Dreuil23.41 km²100% commune
- Hornoy-le-Bourg16.51 km²32% commune
- Amiens15.57 km²31% commune
- Flesselles13.41 km²63% commune
- Belloy-sur-Somme12.89 km²97% commune
- Vignacourt12.67 km²44% commune
- Poulainville12.66 km²100% commune
- La Chaussée-Tirancourt12.49 km²100% commune
- Ailly-sur-Somme12.37 km²83% commune
- Vaux-en-Amiénois11.30 km²100% commune
- Picquigny10.77 km²100% commune
- Bougainville10.35 km²100% commune
- Riencourt10.28 km²100% commune
- Crouy-Saint-Pierre10.14 km²100% commune
- Saint-Aubin-Montenoy9.99 km²100% commune
- Argœuves9.95 km²100% commune
- Saint-Sauveur9.33 km²100% commune
- Soues9.01 km²100% commune
- Hangest-sur-Somme8.89 km²69% commune
- Fourdrinoy8.84 km²100% commune
- Le Mesge8.45 km²100% commune
- Fresnoy-au-Val8.37 km²100% commune
- Bertangles8.11 km²100% commune
- Saisseval7.31 km²100% commune
- Briquemesnil-Floxicourt7.16 km²100% commune
- Bourdon7.13 km²100% commune
- Thieulloy-l'Abbaye7.02 km²48% commune
- Courcelles-sous-Moyencourt6.93 km²96% commune
- Fluy6.02 km²99% commune
- Coisy6.02 km²100% commune
- Fricamps5.94 km²100% commune
- Oissy5.58 km²100% commune
- Cavillon5.56 km²100% commune
- Moyencourt-lès-Poix5.33 km²53% commune
- Breilly5.27 km²100% commune
- Yzeux5.22 km²100% commune
- Saint-Vaast-en-Chaussée4.81 km²100% commune
- Cardonnette4.70 km²89% commune
- Quevauvillers4.69 km²52% commune
- Bovelles4.48 km²65% commune
- Bussy-lès-Poix4.12 km²100% commune
- Allonville3.96 km²38% commune
- Seux3.66 km²100% commune
- Dreuil-lès-Amiens3.53 km²97% commune
- Pissy3.37 km²50% commune
- Villers-Bocage3.28 km²22% commune
- Croixrault3.07 km²35% commune
- Revelles2.62 km²18% commune
- Camps-en-Amiénois2.41 km²56% commune
- Montagne-Fayel2.23 km²33% commune
- Quesnoy-sur-Airaines2.12 km²13% commune
- Flixecourt2.05 km²18% commune
- Rainneville1.80 km²25% commune
- Montonvillers1.20 km²91% commune
- Blangy-sous-Poix0.49 km²6% commune
- Bettencourt-Saint-Ouen0.28 km²4% commune
- Vraignes-lès-Hornoy0.14 km²2% commune
- Saveuse0.12 km²3% commune
- Aumont0.00 km²0% commune
18 intersecting protected areas
Wetland of International Importance (Ramsar Site)
16.78 km² overlap
Basse vallée de la Somme de Pont-Rémy à Breilly
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.95 km² overlap
Étangs et marais du bassin de la Somme
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.52 km² overlap
le marais de picquigny
IUCN IVLand acquired by a regional conservatory of natural areas
0.87 km² overlap
Land acquired by a regional conservatory of natural areas
0.79 km² overlap
le marais de la chaussee
IUCN IVLand acquired by a regional conservatory of natural areas
0.71 km² overlap
Biotope Protection Order
0.67 km² overlap
le marais de tirancourt
IUCN IVLand acquired by a regional conservatory of natural areas
0.62 km² overlap
la vallee d acon
IUCN IVLand acquired by a regional conservatory of natural areas
0.28 km² overlap
9 more protected areassorted by overlap area
le marais du chateau
IUCN IVLand acquired by a regional conservatory of natural areas
0.19 km² overlap
Vallée D\'Acon
IUCN IVBiotope Protection Order
0.10 km² overlap
la montagne de montenoy
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
Moyenne vallee de la somme
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.07 km² overlap
le larry de bourdon
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
Land acquired by a regional conservatory of natural areas
0.04 km² overlap
site geologique
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Le Quaternaire de la vallée de la Somme, loess du Pléistocène sup., Ailly-sur-Somme
IUCN Not ReportedGeotope Protection Order
0.00 km² overlap
Regional Nature Park
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 742 distinct species · 240 466 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 la Somme Canalisée : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 119 interactions GloBI sur 6 types (connectance 15.3%, 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°
10,1°C
Annual rain
658mm
Moisture idx (CMI)
-0,12
Runoff
487mm/an
PET
746mm
AET
528mm
Mean slope
2,1°
Water table
131cm
Forest
0%
Crops
65%
Urban
5%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)