Case study:Fish pass in Las Librerías weir on the Guadiela River

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Location: 40° 30' 40.20" N, 2° 12' 7.44" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydropower
Country	Spain
Main contact forename	Rincón Sanz
Main contact surname	Gonzalo
Main contact user ID
Contact organisation
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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Of the variety of existing fishways, in this particular case the chosen option was the installation of a pool fishpass, the most used kind of fishways.

The advantages of this kind of devices are:

- Little selective. Most fish species will be able to use it effectively.

- It admits wide ranges of flows.

- It presents an optimum behavior against changes of the water level.

The disadvantages of this kind of devices are:

- Plenty of space is required for its installation.

- It needs more maintenance because it can become blocked.

- The price is higher than other fish pass options.

In this case, due to the location of the dam it was decided to build the fishway with a curve of 180 degrees.

Among the alternatives of permeabilization, weir removal was not proposed since the obstacle is in use and it serves to generate hydroelectric energy. An agreement was reached with the owner in order to make a fishway that at least guarantees the circulation of a constant flow downstream the weir.

With this permeabilization it is possible to recover the connectivity between this section and the headwaters of the Guadiela River. However, the presence 3 km downstream of the Los Tilos dam (more than 6m high) prevents this recovery from being complete. It is therefore required to permeabilize this obstacle in order to achieve a more complete reconnection.

Monitoring surveys and results

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The implementation of monitoring programs is essential to evaluate the correct functioning of the fishway. There is no evidence that monitoring programs are being taken for this action.

Lessons learnt

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This permeabilization represent an improvement in the longitudinal connectivity of this river reach, however it is considered necessary to permeabilize the weir located 3 km downstream in order to achieve a more complete reconnection.

Image gallery

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The fishpass built in Las Librerías weir on the Guadiela River. Photo credits: Europa press/JCCM.

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 No National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Brown trout (Salmo trutta), Squalius pyrenaicus 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 100 - 500 k€ Total cost (k€) 144144 k€ <br />144,000 € <br /> Benefit to cost ratio Funding sources Part of this work was supported through FEDER funding (European funding to improve the regional development). 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 Barriers to fish migration, Hydropower Hydromorphology Continuity for organisms Biology Fish: Abundance, Fish: Species composition Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Creation of fish passes 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 http://europe.wetlands.org/publications/river-fragmentation-analysis-spain/ A link on the Wetlands International website to a document that describes the project. http://www.ecohidraulica.com/ All information on this page is copied from the document mentioned above which is written by Ecohidráulica, S.L. Supplementary Information Edit Supplementary Information References Confederación Hidrográfica del Ebro (2009). Pasos de peces para permeabilizar estructuras transversales en la cuenca del Ebro. Tecnoma. WWF (2009). Liberando ríos. Propuestas de la WWF para el desmantelamiento de presas en España.