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Engineers from Paraíba advance on a 130 km canal and over R$ 1 billion to bring water from São Francisco to dozens of cities and transform supply in Agreste
130-kilometer canal combines heavy engineering, billion-dollar investment, and integration with São Francisco waters to expand supply in Paraíba’s Agreste, support productive areas, and reinforce water security in municipalities historically affected by irregular rainfall.
The largest water project in Paraíba brings together open channels, inverted siphons, aqueducts, and galleries in a structure of approximately 130 kilometers, designed to transport water by gravity and enhance water security in dozens of municipalities in Paraíba’s Agreste.
Also known as the Paraíba Coastal Slope, the Acauã-Araçagi Canal integrates the system of utilizing the São Francisco River waters and was planned to bring raw water to urban, rural, and productive areas of the state.
According to the federal government, the project is expected to guarantee water security to about 40 municipalities in Paraíba, reach approximately 680 thousand people, and enable the irrigation of 16 thousand hectares in areas with a strong dependence on regular water supply.
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Besides human supply, the project serves agrarian reform settlements, family and business agriculture areas, and creates conditions for productive activities such as fish farming and shrimp farming in ponds, expanding the economic reach of the project.
Acauã-Araçagi Canal spans 130 km in Paraíba
The scale of the project helps explain why the canal has become one of the most important structures in northeastern water infrastructure, especially in a region marked by recurring droughts and a high dependence on reservoirs.
In total, the Paraíba Coastal Slope Water System comprises 17 segments of open channels, distributed over about 130.6 kilometers, according to official information about the project’s layout.
From the intake at the Acauã reservoir, in the lower course of the Paraíba River, the water flows towards different hydrographic basins until it reaches regions that need supply reinforcement during the dry period.
In practice, the canal’s engineering draws attention because the water conduction does not rely solely on an open ditch, but on a set of structures designed to overcome natural obstacles and road crossings.
The system includes siphon pipelines to cross valleys, aqueducts to overcome stretches of irregular terrain, and galleries intended for crossings with highways and railways along the route.
This combination allows the water to advance by gravity, taking advantage of the terrain’s level difference and reducing the need for permanent pumping in a large-scale project.
Supply in the Agreste depends on water integration
Enhancing the regularity of supply in areas historically vulnerable to drought is the central function of the Acauã-Araçagi Canal, especially in municipalities where the lack of rain affects human consumption, rural production, and economic activities.
In the Northeast, water availability does not depend solely on the volume accumulated in reservoirs, but also on the ability to transport this resource to regions where there is urban, agricultural, and productive demand.
For this reason, water integration projects assume a strategic role in territories with irregular rainfall, reservoirs subject to long periods of low recharge, and communities that depend on permanent solutions.
The water intake of the Acauã-Araçagi Canal is located at the Acauã dam, also known as Argemiro de Figueiredo Dam, the starting point of the structure that distributes the resource throughout the interior of Paraíba.
From this point, the system crosses municipalities such as Itatuba, Mogeiro, Salgado de São Félix, Itabaiana, São José dos Ramos, Riachão do Poço, Sobrado, Sapé, Mari, Cuité de Mamanguape, Araçagi, Itapororoca, and Curral de Cima.
Water project was divided into three lots
To allow the gradual execution of an intervention of this magnitude, the structure was divided into three implementation lots, with sections planned to expand the system’s reach as each phase progresses.
The first two lots total approximately 97 kilometers between the Acauã reservoir and the Mamanguape River basin, while the third section was designed to reach the Camaratuba River basin.
This division allows parts of the system to be delivered and come into operation before the complete project is finished, progressively increasing the number of localities served by the transported water.
Besides the extension, the investment reinforces the importance of the project for Paraíba, as the first two lots total values exceeding R$ 1.2 billion, according to data provided by the federal government.
The amount involves civil interventions, hydraulic structures, channels, crossings, and control devices necessary to safely conduct water to the areas served by the adductor system.
With this scale, the channel also changes the logic of supply in part of the Paraíba territory, which now has a network capable of integrating basins and distributing water more broadly.
This type of infrastructure does not eliminate the effects of drought, but it increases the public authority’s response capacity during periods of lower water availability and reduces dependency on emergency solutions.
São Francisco Water Arrives via Integrated System
One of the central points of the project is the connection with the São Francisco River transposition, which allows expanding the reach of the waters transferred by the East Axis to areas not on the main route.
The waters reach Paraíba through the São Francisco River Integration Project and can be utilized in the state system via the Acauã dam, where distribution begins through the Coastal Slope.
From this connection, the channel functions as a large water artery, bringing the resource to municipalities and productive areas that depend on complementary infrastructure to receive the transposed water.
The expected impact goes beyond domestic supply, as the more regular presence of water can support irrigation projects, reduce losses during drought periods, and diversify productive activities in the field.
According to the federal government, the channel can enable 16 thousand irrigated hectares, a significant number for a region where agriculture heavily depends on predictable water access.
Land reform settlements are also within the influence area of the project, enhancing the relationship between water infrastructure, food production, and the permanence of families in rural areas.
Among the localities mentioned in official information are 21 de Abril, Chico Mendes, and Padre Gino, linked to the municipalities of Riachão do Poço and Sapé, where the channel crosses productive areas.
In these communities, the arrival of water can support agricultural projects, strengthen local economic activities, and reduce dependency on emergency measures used during prolonged drought periods.
Water Security Involves Basins and Productive Areas
The importance of the channel also appears in the management of hydrographic basins, as the system was designed to contribute to the water sustainability of different areas of the Paraíba territory.
Among the basins related to the project are Rio Paraíba, Gurinhém, Miriri, São Salvador, Mamanguape, Araçagi, and Camaratuba, which expands the regional reach of the constructed infrastructure.
In practice, the project was not designed just for one municipality, but for a set of urban, rural, and productive areas that depend on a more stable supply.
Another relevant aspect is the operation by gravity, a solution that reduces the need for continuous pumping and requires precision in the design, layout, and execution of hydraulic structures.
In large-scale water projects, systems dependent on pumping can increase operational costs and require permanent energy structures, making the use of the terrain an important element of the project.
In the case of the Acauã-Araçagi Canal, the water conduction takes advantage of the level difference along the route, maintaining the flow through a combination of slope, technical control, and crossing structures.
The complexity appears in the less visible details of the construction, such as inverted siphons that need to withstand pressure, aqueducts that cross valleys, and galleries that ensure safe passages under highways and railways.
Each component has a specific function to maintain the water flow, avoid interruptions in the system, and allow the structure to operate in an integrated manner over dozens of kilometers.
Mega Water Project Reinforces New Supply Logic
In Brazil, the Acauã-Araçagi Canal reinforces a trend in water infrastructure where large projects cease to be just isolated reservoirs and start forming networks of regional integration.
In areas where water exists in certain points but is lacking in others, transporting and distributing the resource becomes as important as storing it in reservoirs and dams.
This logic helps explain the role of the Paraíba Coastal Watershed within the state’s water security system, especially in regions where irregular rainfall imposes constant pressure on supply.
For the population served, the most direct effect is the possibility of regular supply during the dry period, when droughts affect human consumption, rural production, and animal husbandry.
Predictability in supply can reduce social and economic vulnerabilities in localities dependent on water for consumption, irrigation, productive activities, and maintenance of small rural properties.
Even with the structure built, the full operation of the project depends on efficient operation, maintenance, and management, decisive factors for the canal to fulfill its purpose over the years.
Due to its extension, billion-dollar investment, and connection with the São Francisco waters, the Acauã-Araçagi Canal places Paraíba at the center of major water projects in the Northeast.
The project shows how engineering, territorial planning, and water security intersect in a region marked by a historical coexistence with drought and the search for permanent supply solutions.
Can a project of this magnitude transform the supply and production in the Paraíba Agreste in a lasting way, or will the biggest challenge still be ensuring efficient water management after it arrives?
