Case study:Restoration of R. Odelouca 2

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Location: 37° 14' 41.67" N, 8° 29' 50.67" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Hydromorphology, Monitoring
Country	Portugal
Main contact forename	Rui
Main contact surname	Cortes
Main contact user ID	User:Rcortes
Contact organisation	UTAD
Contact organisation web site	http://www.utad.pt
Partner organisations	Águas do Algarve, SA
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This is an integrated restoration programme in a Mediterranean catchment with a significant conservation value. The construction of the River Odelouca dam for improving water supply in the Algarve region of south Portugal, located in Natura 2000 protected area, involved the definition of a variety of compensation measures including environmental requalification of selected river segments not affected by the reservoir. We cover the whole sequence of the project: a) characterization and selection of reaches to rehabilitate based on the definition of physiographic units and the relative quantification of impacts; b) implementation of soil engineering techniques for improving riparian habitat, bank stability and to control invasive species c) defining best river channel habitat improvement options for endangered endemic fish populations using two-dimensional hydraulic modeling (R2D); d) post-project appraisal and monitoring of floristic succession, fish, benthic fauna and habitat .

Monitoring surveys and results

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Lessons learnt

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The success of the defined measures was hampered by three principal factors, firstly failure to engage local landowners early in the programme; the timing of key tasks, such as planting riparian trees; continued difficulty to control sources of environmental disturbance, in particular serious and continuous point pollution from animal husbandry. Consequently fish assemblages in all stream reaches were still dominated by aliens and highly tolerant species, and native cyprinids were low abundant or absent, revealing the fish index of biotic integrity a low environmental quality.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use 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 Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category 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 Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information