Difference between revisions of "Nansa River. Morphological and functional restoration of the Nansa River at Muñorrodero"

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[[Image:Nansa1.jpg|left||thumb|300px|Construction of the new levee for flood protection with bioengineering techniques]][[Image:Nansa2.jpg|center||thumb|300px| The side arm once restored]][[Image:Nansa3.jpg|center|Plan of the main actions]]<br /><br /><br /><br /><br /><br /><br /><br />
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[[Image:Nansa1.jpg|left||thumb|300px|Construction of the new levee for flood protection with bioengineering techniques]][[Image:Nansa2.jpg|center||thumb|300px| The side arm once restored]][[Image:Nansa3.jpg|center|Plan of the main actions]]<br />
  
 
==Success criteria==
 
==Success criteria==

Revision as of 16:28, 14 June 2010

Nansa River. Morphological and functional restoration of the Nansa River at Muñorrodero


Factsheet: Nansa River. Morphological and functional restoration of the Nansa River at Muñorrodero

General
Country ES
River Name Nansa
Site Name Nansa River. Morphological and functional restoration of the Nansa River at Muñorrodero
River Characterisation
    River typology
    Location (Lat Lon) 43.3641273479357, -4.48894500732422
    Altitude lowland: < 200 m
    Catchment area medium: > 100 - 1000 km2
    Geology Calcareous
    National code/
    River type name

    Biological quality elements
    Ecosystem Services
    EU Directives
    Pressures
    Measures
    Other
    Project size -1
    Approximate costs > 1 000 000 Euros
    Synergy Proximity of the village of Muñorrodero. Flood protection.
    Status Realised
    Period of realization 01/09/2009 - 01/05/2010
    Evaluation
    Implemented by Confederación Hidrográfica del Cantábrico - Comisaría de Aguas. Executed by TRAGSA


    Key features of the case study

    The lower reach of the Nansa River was channelized in 1995 in Muñorrodero. As a result of this, its former right branch lost its connection with the main channel, although its morphology remained virtually unchanged. This situation led to a loss of acuatic and riparian habitats.
    The project was designed by the Confederación Hidrográfica del Cantábrico, executed by TRAGSA with the financing of the Spanish Ministry of the Environment. The objective was to restore the former morphology and fluvial dynamics in the Nansa River.

    Site description

    Nansa River has a length of 3200 meters and a basin surface of 411 Km2. The channel width is around 10 meters. The river discharge is around 12,5 m3/s, and the stream power of 245.8 kg m s-3. The substrate consists of sandstone and limestone. The vegetation is composed by a mixed riparian forest (Alnus glutinosa and Salix sp.) and grassland. Among the fish species we can find Salmo salarand Petromyzon marinus.

    Measures selection

    The main objective was to restore the fluvial dynamics and reconnect a former secondary channel (the ideal situation was braided channel mporphology). The proximity of Muñorrodero village imposed some constraints, as flood protection measures were also necesary. Thus, a levee was constructed with bioengineering techniques. The former chanch was conceived as a high flow channel, while the main channel is expected to discharge water with low flows. this measure would help to disipate the energy of the high flows, increase the retention of water in the watershed, and increase the diversity of riparian habitats, as the hydrological and morphologival conditions vary from the main channel to the side arm.
    Alongside to the restoration measures, two footbridges were built and paths were arranged for enable recreational use of this area.


    Construction of the new levee for flood protection with bioengineering techniques
    The side arm once restored
    Plan of the main actions

    Success criteria

    Ecological response

    Hydromorphological response

    Monitoring before and after implementation of the project

    Socio-economic aspects

    Contact person within the organization

    Rubén Santos Alonso
    Grupo de Cauces - Tragsa
    Centro Cívico
    c/ Comandante Caballero s/n
    33005 Oviedo

    Extra background information

    References


    Related Measures

    Related Pressures