HydroBASINS lev08 watershed · #6080400930
Bassin de Riacho São João
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 32 administrative regions : Aiuaba, Alagoinha do Piauí, Alegrete do Piauí, Aroeiras do Itaim, Belém do Piauí +27
Sub-basin area
8 451,7km²
Upstream area
8 451,9km²
Discharge
11,11m³/s
Mean elev.
451m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
32 dept-equivalent regions (GADM L2)
- 1834.0 km²21.8% of basin
- 766.8 km²9.1% of basin
- 535.9 km²6.4% of basin
- 531.9 km²6.3% of basin
- 492.2 km²5.8% of basin
- 439.3 km²5.2% of basin
- 410.2 km²4.9% of basin
- 401.6 km²4.8% of basin
24 moreFull L2 list
- Santo Antônio de Lisboa360.3 km² · 4.3%
- Campo Grande do Piauí311.7 km² · 3.7%
- São Julião291.1 km² · 3.5%
- Bocaina261.7 km² · 3.1%
- São José do Piauí208.1 km² · 2.5%
- Sussuapara205.2 km² · 2.4%
- São Luis do Piauí204.7 km² · 2.4%
- Vila Nova do Piauí201.8 km² · 2.4%
- Alegrete do Piauí195.8 km² · 2.3%
- Jaicós164.0 km² · 1.9%
- Paquetá138.5 km² · 1.6%
- Pimenteiras116.5 km² · 1.4%
- Santana do Piauí100.2 km² · 1.2%
- Caldeirão Grande do Piauí89.5 km² · 1.1%
- Aroeiras do Itaim64.4 km² · 0.8%
- Belém do Piauí33.4 km² · 0.4%
- Aiuaba16.2 km² · 0.2%
- Parambu10.7 km² · 0.1%
- Itainópolis8.3 km² · 0.1%
- Campos Sales7.3 km² · 0.1%
- Lagoa do Sítio6.2 km² · 0.1%
- Salitre5.0 km² · 0.1%
- Dom Expedito Lopes1.8 km² · 0.0%
- Francisco Macedo1.4 km² · 0.0%
1 intersecting protected areas
Environmental Protection Area
491.81 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
464 distinct species · 1 300 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Riacho São João : 26 espèces reliées par 35 interactions GloBI sur 3 types (connectance 6.6%, 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°
25,2°C
Annual rain
693mm
Moisture idx (CMI)
-0,60
Runoff
46mm/an
PET
1 748mm
AET
585mm
Mean slope
2,9°
Water table
508cm
Forest
11%
Crops
14%
Urban
0%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)