Case study:Demolition of weir on the River Nora, Nalón Basin

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Location: 43° 25' 38.52" N, 5° 52' 27.93" W

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Project overview

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Status	Complete
Project web site
Themes
Country	Spain
Main contact forename	The North Hydrographic Confederation
Main contact surname	The North Hydrographic Confederation
Main contact user ID
Contact organisation	MARM
Contact organisation web site	http://www.magrama.gob.es/es/
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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The River Nora is located in the North of Spain, in Asturias, and is part of the Nalon Basin. The project described here is the demolition of a small obsolete weir which has ended his achievement concession. The longitudinal continuity of the river was interrupted by some artificial obstacles, especially older bypass channels. In the town of Guyame there was a dam with triangular section, (approximate dimensions of 60 x 8 x 2 m) which is the obstacle removed in this project. The project's main objective was the return of continuous longitudinal section of river affected by the dam. In addition, we proceeded to clean up part of the riverside vegetation blocking the channel, thereby increasing the hydraulic capacity. The restoration works were carried out in late 2007 by the company TRAGSA. The works will be controlled and managed through the North Hydrographic Confederation.

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Aerial view of Guyame

Picture of Nora River on its way through Guyame before works

Picture of Nora River on its way through Guyame after works

Turbidity of Nora River by discharges of infrastructure works in 2009.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district C.H. Cantábrico River basin Nalón Subcatchment River name Nora Area category 100 - 1000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 135 m0.135 km <br />13,500 cm <br /> Dominant geology Siliceous Ecoregion Ibero-Macaronesian Dominant land cover Grassland Waterbody ID Site Edit site Name Azud de Nora en Guyame WFD water body codes WFD (national) typology WFD water body name Pre-project morphology 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 Artificially regulated Dominant substrate River corridor land use Woodland, Urban 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) 20.9820.98 m³/s <br />20,980 l/s <br /> Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 67 m0.067 km <br />6,700 cm <br /> Project started Works started 2007/11/01 Works completed 2007/11/01 Project completed Total cost category Total cost (k€) 11,027 k€11,027,000 € <br /> Benefit to cost ratio Funding sources MARM, C.H.Cantábrico 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 C.H. Cantábrico Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Continuity for organisms, Continuity of sediment transport Biology Fish: Abundance Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal 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 Continuity for organisms Yes Yes Yes Improvement Continuity of sediment transport Yes Yes Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Awaiting results 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 documentation (in Spanish) Additional links and references Edit links and references Link Description http://www.chcantabrico.es/index.php?option=com content&view=article&id=574:demolicion-de-azud-en-el-rio-nora-a-la-altura-de-guyameconcejos- de-llanera-y-oviedo&catid=191:demolicionazudes&Itemid=247&lang=es Project description http://pescarmona.blogspot.com/2009/12/en-asturias-en-el-rio-nora-la-altura-de.html Blog from the local fishermen http://www.iusiero.org/spip.php?article360 Local news Supplementary Information Edit Supplementary Information