The Valdivia River (Spanish: Río Valdivia) is a major river in the Los Ríos Region of southern Chile. It is formed by the confluence of the Calle‑Calle River and the Cau‑Cau River in the city of Valdivia, and it flows westward into Corral Bay on the Pacific Ocean.
Geography
- Length: Approximately 15 km (9.3 mi).
- Basin size: About 10,275 km² (3,967 sq mi).
- Source: Continuation of the Calle‑Calle River at its junction with the Cau‑Cau River.
- Mouth: Corral Bay, Pacific coast, at sea level.
Hydrology
- Average discharge: 687 m³ s⁻¹ (24,300 cu ft s⁻¹).
- Discharge varies seasonally, with the highest flow typically in July (≈ 1,293 m³ s⁻¹) and the lowest in March (≈ 592 m³ s⁻¹).
- During low‑discharge periods, saline water can advance upstream, reaching the Calle‑Calle tributary.
Tributaries
Key tributaries include the Cruces River, the Tornagaleones River, and the Futa River.
Human infrastructure
The Pedro de Valdivia Bridge spans the river in downtown Valdivia, providing a principal crossing for road traffic.
Estuarine characteristics
The river’s estuary exhibits depth variations from 7 m to 22 m and contains a saline wedge that influences local marine and freshwater ecosystems. Foraminiferal studies have identified the dominance of Trochamminita salsa in adjacent wetlands.
Population
The river basin supported a population of approximately 168,489 people as of the 2002 census.
References
- “Cuenca del río Valdivia,” archived PDF, 2007.
- Biblioteca del Congreso Nacional de Chile, “Hidrografía Región de los Ríos,” 2022.
- Garcés‑Vargas et al., “Caracterización hidrográfica del estuario del río Valdivia,” Latin American Journal of Aquatic Research, 2013.
- Jenningst et al., “Marsh Foraminiferal Assemblages in the Valdivia Estuary,” Journal of Coastal Research, 1995.