The Huasco River in the Atacama Region of Chile is no typical hardly flows. The Atacama desert is one of the driest places on Earth, yet maintaining the flow of the Huasco river is crucial. The river sustains livelihoods and farming communities, export businesses and ecosystems - all dependent on the river's flow.

Competing water uses reduce viability of water resources in Chile

Fed by glaciers straddling the Chile Argentina border high up in the Andes, the Huasco River is formed by the confluence of the Del Carmen and Del Transito tributaries. From source to sea, the Santa Juana Reservoir stores water for irrigation needs. But residents in the Huasco Basin are concerned they may fare the same way as neighboring town Copiapó 140km to the North. Copiapó has received no rainfall for the last 10 years. In recent years the Copiapó River has dried up due to mining and agricultural activity in the region and the future of Copiapó is uncertain as residents grapple with the concept of leaving their homes and their land due to water scarcity.

The controversial Pascua-Lama open-pit mining project high in the mountains brings significant revenue to both Chile and Argentina and employment for the region. But the proximity of the mine to the glaciers, the source of the Huasco River, has caused controversy and public protest in Chile, including demonstrations and petitions presented to the Chilean government. Opponents to the mine argue that the project will affect the river’s flow and therefore farmers who are dependent on the water supply.

Transferred water rights between agriculture and mining may be affecting the availability of water downstream for farmers, yet regulation and monitoring of water distribution is difficult where land ownership is private and water rights are complex. Future planned development in the basin, and expanding land use for agriculture is also extracting more water from the river, at times reducing flow to zero along the river channel. These elements all pose difficult challenges for water management and new approaches to water allocation are needed.

Supporting the role of environmental flows in restoring and maintaining river flows for all users

The project aims to work with stakeholders in the Huasco Basin to try and improve water management in the basin, as well as to develop an environmental flows assessment in order to maintain future river flows. Local partners including Centro del Agua para Zonas Áridas y Semiáridas para América Latina y el Caribe (CAZALAC), the regional office of the Direction General of Water Resources of Chile (DGA), the regional office of the National Environmental Council of Chile (CONAMA), Proyecto Territorial Integrado Huasco of CORFO, the Regional Intendancy (Atacama Region), the Irrigation Water Users Boards (Junta de Vigilancia del Río Huasco), the Regional Water Resources and Environment bodies, and Fundacion Chile are leading the project focussing on the best approach to implement environmental flows to maintain ecosystem services from and for the river. 

Competing water uses range from mining, a coastal wetland, agriculture, recreation, and future developments such as the largest intensive pig farm in Chile. A recent proposal by Hidroelectrica Rio Huasco for the construction and operation of a hydroelectric plant using irrigation water stored in the Santa Juana reservoir may also affect flow timing and releases from the dam, affecting the needs of irrigation and the environment.

Further Reading