Brazil's drought: Northern rivers still dropping

The worst drought in Brazil's history continues to reduce river levels in the Northern Arc region, hampering navigation on rivers that are used as waterways and are important routes to transport grains and fertilizers.

Madeira waterway

The waterway links Rondonia state's capital Porto Velho to the Itacoatiara port, in Amazonas state. Itacoatiara port is expected to receive around 371,435 metric tonnes (t) of fertilizers in September, according to line up data from shipping agency Unimar.

Status: The situation is most critical in the Madeira waterway, the second largest in the northern region, in Porto Velho. The state's ports and waterways authority (Soph) halted operations there on 23 September because the Madeira River's depth at the port reached 25cm (9.8in), the lowest since monitoring began in 1967.

The Madeira River depth in Porto Velho increased to 34cm on 26 September, according to monitoring data from the Brazilian Geological Survey (SGB).

Amazonas waterway

It is the main waterway in Brazil's north, handling around 65pc of the region's cargo, according to the national transportation and infrastructure department (Dnit). It links Amazonas' capital Manaus to Para's capital Belem.

Status: The Negro River has also been falling. The depth was at almost 13.88m at the SGB monitoring point in Manaus on 26 September — an extreme drought level and very close to the historic low of 13.64m recorded in 2023.

Tapajos waterway

It is an important waterway to move production from Mato Grosso state's northern area, with the Santarem port, in Para state, as a destination. The Santarem port handled nearly 4mn t of cargo in 2023, with fertilizers accounting for 578,630t, according to the Para port authority.

Status: The Tapajos-Teles Pires waterway is also facing a dire situation. The national water and sanitation agency ANA declared a water shortage on the Tapajos River on 23 September. Drier weather than usual has dropped the levels of Tapajos, especially in the stretch between Itaituba and Santarem cities, in Para state, where flows are below the minimum levels observed in history.

The depth of the Tapajos River at the Itaituba monitoring point, where the transfer point for the Miritituba waterway is located, was at 92cm on 26 September, below the record low of 132cm, according to SBG data.

At the Santarem monitoring point, where the port of Santarem is located, the Tapajos River was at 74cm, a level considered dry. The historical minimum at the location is -55cm below the port's reference point. A level below zero does not mean the river is dry, but a negative reading indicates very low conditions.

Tocantins-Araguaia waterway

The Tocantins-Araguaia waterway encompasses the Araguaia and Tocantins rivers. It runs from the Barra do Garcas city, in Mato Grosso, onto the Araguaia River, or from Peixes city, in Tocantins state, onto the Tocantins River, to the port of Vila do Conde, in Para. Soybeans, corn, fertilizers, fuels, mineral oils and derivative products are transported via the northern waterways. Vila do Conde port handled 19.3mn t of cargo in 2023, according to Para port authority.

Status: The SGB has two monitoring points on the Araguaia River. In the Nova Crixas city, in Goias state, the river was at 299cm, below the historical level of 310cm. In Sao Felix do Araguaia city, in Mato Grosso state, the river was at 257cm, a situation of extreme drought and close to the historical minimum level of 251cm.

In September, the federal government announced investments of R500mn ($91.4mn) to carry out dredging work on stretches of rivers in Amazonas. Para's state government requested another R146mn to address problems caused by the drought.

By João Petrini