Case study:Guadiamar Green Corridor Project

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Location: 37° 21' 17.55" N, 6° 14' 1.36" W

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Project overview

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Status	Complete
Project web site
Themes
Country	Spain
Main contact forename	MARM
Main contact surname	MARM
Main contact user ID
Contact organisation	Junta de Andalucía
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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In April 1998 there was a breach in a tailings pond in the Guadiamar River area, causing a spill of 6 million cubic hectometres of sludges with a high concentration of heavy metals (zinc, lead, arsenic, copper, antimony, thallium, cadmium). The objectives of this project were the Guadiamar River ecological restoration, removal of sludge and effluent pollutants, and creating a green corridor. In addition, we conducted a strategic planning for the different communities of macroinvertebrates, fish, reptiles, birds... The project included several monitoring programs and analysis, in particular, water quality, to see if the level of pollutants had decreased. This project of restoration and recovery of the area was carried out between 1998 and 2005. The total budget for carry out the rehabilitation and restoration of 62 Km of the Guadiamar River was 165.396.261€. The financing came from the MARM and the Consejería of Environment, Andalucía.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Catchment

River basin district	C.H.Guadalquivir
River basin	Guadalquivir

Subcatchment

River name	Guadalquivir
Area category
Area (km2)
Maximum altitude category	Less than 100 m
Maximum altitude (m)	50 m0.05 km <br />5,000 cm <br />
Dominant geology
Ecoregion	Ibero-Macaronesian
Dominant land cover	Extensive agriculture
Waterbody ID

Other case studies in this subcatchment: Control and permeabilization of the marsh to the river, the Brazo de la Torre and Entremuros, Recovery "CañoTravieso", Recovery of the functionality of Brazo de la Torre, Restoration of streams Chico Soto, Soto Grande and Arroyo de la Laguna de los Reyes, Restoration of the stream of the Partido

Site

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Name	Caño Guadiamar
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Sinuous
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body	true
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate	Clay, Silt
River corridor land use	Extensive agriculture
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	12000 m12 km <br />1,200,000 cm <br />
Project started	1998/04/01
Works started
Works completed	2005/11/01
Project completed
Total cost category	more than 10000 k€
Total cost (k€)
Benefit to cost ratio
Funding sources

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision			Junta de Andalucía
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure	Pollution incident
Hydromorphology	Connection to groundwaters, Structure & condition of riparian zones, Channel pattern/planform
Biology
Physico-chemical	Acid neutralising capacity
Other reasons for the project	Landscape enhancement

Measures

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Structural measures
Bank/bed modifications	Recovering connectivity longitudinal and transversal
Floodplain / River corridor	Buffer strips, Recovery of dynamic river system, Facilitate natural regeneration of riparian vegetation
Planform / Channel pattern	Remove drains and pipes
Other	Elimination of pollutants due to the discharge of toxic sludge, Recovering natural habitats, Recovering natural landscapes
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Connection to groundwaters	Yes	Yes	Yes	Yes		Awaiting results
Structure & condition of riparian zones	Yes	Yes	Yes	Yes		Awaiting results
Channel pattern/planform	Yes	Yes	Yes			Awaiting results

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Acid neutralising capacity	Yes	Yes		Yes		Improvement

Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Landscape enhancement	Yes	Yes	Yes	Yes		Improvement

Monitoring documents

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Image gallery

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Aerial view

Map of the area affected by the flood

Photo of the Agrio River and Guadiamar floodplain after flood of toxic sludges.

Cleaning and conditioning of slopes

Mechanical removal of sludges from the riverbed

Aerial view of Guadiamar river floodplain after works

Guadiamar riverside forest

Additional documents and videos

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Additional documentation (in Spanish)

Additional links and references

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Link	Description

Supplementary Information

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