On the basin scale, through the water storage system, the aim is to balance the upstream and downstream water resources, and form a three-industry network of the basin, which is expected to reach the goal——the city provides technology for nature while nature supplies food, energy, spaces of leisure and natural education for the city.

Through the establishment of the CO-NET, a public service system is formed in the urban area. And in suburb, a composite urban-natural space will be formed to integrate scientific research, agriculture, forestry and tourism. The outer suburbs are dominated by conservation and forest health activities which shall take no harm for nature.

In terms of the water storage system, the project plans to build the system by adding different types of rainwater adjustment facilities along the river. As for the rural area in Florida, it appears as ponds for irrigation and create space for daily life. In the mountain area, they are reservoirs and hydro-electronic power stations where has a large height difference relatively. In the urban area, they are urban rain water parks, collecting and draining water while providing perfect public space for people. In the estuary wetland, they are natural water adjustment facility, combined with a small amount of human activity.

Responding to the status of function, space, and social fragmentation, the project plans to restore and rebuild Four Service Networks around the water system:

1. Flood Control Net for safety: along with the landform, forming the system of five elements: gully-intercepting ditch (between built area and mountains ) -pond (storage on rainy days and drain on drought days) -branch river-wetland-main river.

2. Bio-diversity Net for biological habitat and migration: restoring and building a patch-corridor-matrix system.

3. Non-motorized Net for people to walk and cycle along the river: constructing continuous cycling lane along the water with bike station for rent and rest service.

4. Facility Net for cultural and recreational activities of residents: supplying libraries, art centers, community centers, and other related facilities along the river. The four networks are integrated to form a comprehensive river section space. In engineering, by integrating the flood section, adding flood control lane, stabilizing and naturalizing river bed, and supplying plantation along with the terrain, the project will finally form a comprehensive flood-proofing and biological friendly riverfront area for human activity.

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The Biobío Region, where locates Andalién river basin, is an important area in central Chile for food producing, forest resource and seaport. In general, the Andalién river basin has both natural and cultural resources, as well as droughts and floods caused by uneven water volume in the upstream and downstream due to topography.

Therefore, we propose a “COOPERATIVE MECHANISM” based on the river on different spatial scales. Reflected in space, we call it “CO-NET”:

1. On the basin scale, a co-net of river and economy;

2. On the urban scale, a co-net of river and service;

3. On the community scale, a co-net of river and social life.

The goal of CO-NET is to revitalize every part of the Andalién river, to explore what the river can provide for Concepción and its surrounding residents, and also explore what each stakeholder can contribute to the renaissance of the river.