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

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Location: 43° 25' 39", -5° 52' 28"
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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
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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.

Monitoring surveys and results

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Lessons learnt

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Image gallery


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.
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Catchment and 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 m
0.135 km
13,500 cm
Dominant geology Siliceous
Ecoregion Ibero-Macaronesian
Dominant land cover Grassland
Waterbody ID



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) 20.98
20.98 m³/s
20,980 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 67 m
0.067 km
6,700 cm
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 €
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

Mitigation of a pressure
Hydromorphology Continuity for organisms, Continuity of sediment transport
Biology Fish: Abundance
Physico-chemical
Other reasons for the project


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

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

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

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

Any other monitoring, e.g. social, economic

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


Monitoring documents



Additional documents and videos


Additional 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

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