Upon reviewing the way waterways have been artificialized, the renaturalization of rivers proposes solutions that integrate infrastructure, ecology, and social use of urban space.
Submitted at Jan 28, 2026, 10:00 AM
Rio natural (Freepik/Divulgação)
The urbanization has profoundly transformed the relationship between cities and rivers. Throughout the 20th century, many watercourses were channeled, rectified, or buried to meet the demands of growth, circulation, and flood control. Over time, these interventions have begun to reveal important environmental and urban limits.
Rio natural (Freepik/Divulgação)
In this context, the renaturalization of rivers emerges as an approach that seeks to rebalance this relationship. More than just recovering natural landscapes, the concept involves technical and urban solutions that reposition rivers as an active part of the city's ecological infrastructure.
The renaturalization of rivers is a set of strategies aimed at the recovery of the natural functions of a watercourse, even when it is situated in densely urbanized areas. The goal is not to eliminate the presence of the city but to allow the river to resume essential ecological roles, such as absorption of rainwater and maintenance of biodiversity.
Bonito (Divulgação/Divulgação)
This process can include the removal of rigid channeling, the reconfiguration of the riverbed, the recovery of the banks, and the reintroduction of native vegetation. The renaturalization of rivers considers both environmental aspects and the social use of space, integrating the watercourse into urban daily life in a more balanced way.
The artificialization of rivers is directly linked to the model of accelerated urbanization adopted in many cities. To make way for roads, buildings, and drainage systems, rivers have come to be treated as physical obstacles, rather than as structuring elements of the territory.
Com 17 km de extensão ao longo da margem oeste do Rio Pinheiros, o Parque Linear Bruno Covas revitaliza áreas urbanas de São Paulo, oferecendo espaços de lazer, mobilidade e contato com a natureza. (Imóveis Prime/Divulgação)
Although these solutions provided quick responses to problems such as flooding and sanitation, they have brought long-term consequences. Soil sealing, increased water velocity, and environmental degradation have intensified flooding, reduced water quality, and broke the relationship between the population and rivers, paving the way for discussions about renaturalization of rivers.
In practice, the renaturalization of rivers depends on the characteristics of each territory. In some cases, it involves large engineering interventions to return the river to a course closer to the natural one. In others, gradual actions, such as expansion of green areas and the recovery of riparian vegetation, already produce positive impacts.
Rio natural (Freepik/Divulgação)
A central point is to allow the river to interact again with the soil and floodplain areas, reducing the rigidity of concrete structures. River renaturalization projects tend to be interdisciplinary, bringing together experts in urbanism, projects, and infrastructure, as well as considering public use of these spaces as part of the plan.
The renaturalization of rivers generates impacts that go beyond the environmental dimension, directly reflecting on urban dynamics and the quality of life in cities.
From an environmental perspective, renaturalization contributes to the improvement of water quality, the increase of biodiversity, and the recovery of aquatic ecosystems. The presence of native vegetation helps in filtering pollutants, stabilizing the soil, and regulating thermal conditions of the projects.
In the urban context, renaturalized rivers can act as axes of coexistence, leisure, and active mobility. Furthermore, nature-based solutions tend to reduce flood risks and increase the resilience of cities in the face of extreme weather events, making urban infrastructure more efficient and integrated into the projects.
CASACOR Publisher is a creator of exclusive content, developed by the CASACOR Technology team based on the knowledge base of casacor.com.br. This text was edited by Yeska Coelho.
