Case study:Mars- en Zandwetering: Difference between revisions

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{{Case study status
 
|Approval status=Draft
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{{Location
|Location=52.275343252193494, 6.16405816350059
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{{Project overview
|Status=Complete
|Themes=Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
|Country=Netherlands
|Main contact forename=Sander
|Main contact surname=Verheijen
|Contact organisation=Waterschap Drents Overijsselse Delta
|Contact organisation url=www.wdodelta.nl
|Name of parent multi-site project=Building with nature in streams
|Multi-site=No
|Project summary=The Marswetering is a slow flowing river in a region that is characterized by agriculture, woodland and rural estates. Its natural hydrological regime has been altered by withdrawals for agricultural purposes and by water level regulating structures. As a consequence, development of vegetation, macroinvertebrates and fish have been held back. The stream faces similar problems to those of the Marswetering outlined above.
The Zandwetering is a slow flowing waterway in the urban area of Deventer and the countryside to the north. The latter, downstream part of the waterway is characterized by meadows, fields and woodland.
The water authority has made an attempt to create more variation in morphology and flow structure of the Marswetering and Zandwetering by introducing dead wood in the stream. The wood was introduced below the water line to create narrower stretches in the stream. This was done at five locations in the Marswetering and six locations in the Zandwetering.
This measure was carried out  along with other measures, such as the creation of fish passes and water level adaptations. This page focuses on the introduction of dead wood.
|Monitoring surveys and results=The effect of the measures on the abundance of macroinvertebrate and fish has been monitored. The experiments did not yield any favourable results, probably because the selected streams have a rather low discharge and are therefore less suitable for this type of measures.
|Lessons learn=Although the method yielded no results in this particular location, it has since been applied in various other projects and is generally well received by society. An important lesson is that a sufficiently high discharge is required for this measure to function. Projects such as this one can be complicated by a shortage of available wood and problems cleaning out debris. It has also been noticed that willow wood is less suitable for this measure, as it degrades quickly and is likely to sprout.
|Project title=Mars- en Zandwetering
}}
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{{Case study subcatchment}}
{{Site
|Name=Marswetering; Zandwetering
|WFD water body code=NL04_MARS-WETERING; NL04_SAL_ZANDWETERING
|WFD (national) typology=R5
|WFD water body name=Marswetering; Zandwetering
|Heavily modified water body=Yes
|Protected species present=No
|Invasive species present=No
|Dominant substrate=Sand
|Mean discharge category=0.1 - 1.0 m³/s
|Average channel gradient category=Less than 0.001
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{{Project background}}
{{Motivations}}
{{Measures}}
{{Hydromorphological quality elements header}}
{{End table}}
{{Biological quality elements header}}
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{{Physico-chemical quality elements header}}
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{{Other responses header}}
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{{Monitoring documents}}
{{Monitoring documents end}}
{{Additional Documents}}
{{Additional Documents end}}
{{Additional links and references header}}
{{Additional links and references footer}}
{{Supplementary Information}}
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Latest revision as of 13:41, 3 December 2020

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