Difference between revisions of "DOÑANA/RESTAURACIÓN DEL ARROYO DEL PARTIDO"

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==Measures selection==
 
==Measures selection==
 +
Three alternatives could be considered:<br />
 +
:#Keep the channel but modifying its design. The modification would consist in increase the hydraulic capacity of the channel (minimun flow channel and a high flow channel with lateral levees)to avoid erosion processes at the surroundings. The revegetation of the streambanks would serve to give stability against the erosion and improve the habitat conditions.<br />
 +
:#Partial or total recovery of the original processes of El Partido at its final reach, allowing the expansion of the extraordinary flows over a wide floodplain, and restablishing the funtionality of the original braided channels. This would disipate energy and reduce the flow shear force. The sediments would be deposited at the floodplain before they arrive to the Doñana marshes.<br />
 +
:#No action. Over the time, and after an initial period of sedimentation at the marshes, the artificial channel would disappear by aggradation and streambank erosion.At the end, the original floodplain would be recovered, and so the strem dynamics.<br />
 +
Finally, the alternative 2 was selected because it achieves the technical and environmental objectives with an acceptable cost from the economic and social point of view.
  
 
==Success criteria==
 
==Success criteria==

Revision as of 12:43, 8 April 2010

Doñana.El Partido


Factsheet: Doñana. Restauración del arroyo del Partido

General
Country ES
River Name Arroyo del Partido
Site Name Doñana. Restauración del arroyo del Partido
River Characterisation
    River typology
    Location (Lat Lon) 37.1311714078244, -6.46699905395508
    Altitude lowland: < 200 m
    Catchment area medium: > 100 - 1000 km2
    Geology
    National code/
    River type name
    2

    Biological quality elements
    Ecosystem Services
    EU Directives
    Pressures
    Measures
    Other
    Project size -1
    Approximate costs 10 000 - 100 000 Euros
    Synergy Doñana 2005 Hydric regeneration of Doñana´s watersheds and river networks
    Status Realised
    Period of realization 1998 - 2005
    Evaluation None
    Implemented by Ministerio de Medio Ambiente


    Key features of the case study

    Arroyo del Partido collects water from a watershed of 308 km2 caracterized by a torrential behavior. Land use changes (and agricultural practices)and channelizations have induce problems of erosion, transport and deposition of sand.

    Site description

    Measures selection

    Three alternatives could be considered:

    1. Keep the channel but modifying its design. The modification would consist in increase the hydraulic capacity of the channel (minimun flow channel and a high flow channel with lateral levees)to avoid erosion processes at the surroundings. The revegetation of the streambanks would serve to give stability against the erosion and improve the habitat conditions.
    2. Partial or total recovery of the original processes of El Partido at its final reach, allowing the expansion of the extraordinary flows over a wide floodplain, and restablishing the funtionality of the original braided channels. This would disipate energy and reduce the flow shear force. The sediments would be deposited at the floodplain before they arrive to the Doñana marshes.
    3. No action. Over the time, and after an initial period of sedimentation at the marshes, the artificial channel would disappear by aggradation and streambank erosion.At the end, the original floodplain would be recovered, and so the strem dynamics.

    Finally, the alternative 2 was selected because it achieves the technical and environmental objectives with an acceptable cost from the economic and social point of view.

    Success criteria

    Ecological response

    Hydromorphological response

    Monitoring before and after implementation of the project

    The Doñana 2005 programme includes several studies to know the ecosystems´condition before, during and after the actions.Among the studies figure:

    • Hydrogeomorphology
    • Physical and chemical quality of water and fitozooplankton
    • Aquatic and terrestial vegetal communities
    • Estuary and freshwater macroinvertebrates
    • Vertebrate communities

    These studies started with the first project of the programme and lasted few years after the last one was finished.

    Socio-economic aspects

    Contact person within the organization

    Extra background information

    Arroyo del Partido has been channelized its final reach for flood prevention. Removing the wall of the left margin, the expansion will allow the water to recover the original floodplain and restore the alluvial fan at its confluence with the marsh. The wall of the right margin is maintained and reinforced to protect the strawberry fields and other irrigation farmland. This action includes forestry and agri-environment measures, including restoration of the stream margins and actions in the alluvial fan to restore the natural appearance.

    Alluvial fan previous.jpg
    Aerial view of the alluvial fan previous to the restoration implementation

    Plano Partido.jpg
    Map of the main measures

    References

    http://www.mma.es/secciones/el_ministerio/organismos/oapn/donana2005/pdf/todas_actuaciones_donana_05_r.pdf

    Related Measures

    Related Pressures