Case study:Zandwetering: Difference between revisions

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|Name of parent multi-site project=Building with nature measures in streams
|Name of parent multi-site project=Building with nature measures in streams
|Multi-site=No
|Multi-site=No
|Project summary=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. ts 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. he 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 at six locations below the water line to create narrower stretches in the stream. This measure was carried out along with other measures, such as the creation of fish passes. This page focuses on the introduction of dead wood.
|Project summary=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. 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 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 at six locations below the water line to create narrower stretches in the stream. This measure was carried out along with other measures, such as the creation of fish passages. 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.
|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.
|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.

Revision as of 09:44, 20 April 2021

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Location: 52° 16' 37.53" N, 6° 9' 43.64" E
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
Country Netherlands
Main contact forename Sander
Main contact surname Verheijen
Main contact user ID
Contact organisation
Contact organisation web site http://www.wdodelta.nl
Partner organisations
Parent multi-site project

Building with nature measures in streams

This is a parent project
encompassing the following
projects 		No
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Project summary

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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. 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 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 at six locations below the water line to create narrower stretches in the stream. This measure was carried out along with other measures, such as the creation of fish passages. This page focuses on the introduction of dead wood.

Monitoring surveys and results

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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 learnt

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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.


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Catchment and subcatchment

Catchment

River basin district Rijn
River basin Rijndelta

Subcatchment

River name Vecht
Area category 1000 - 10000 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m)
Dominant geology Siliceous, Organic
Ecoregion Central Plains
Dominant land cover Grassland, Intensive agriculture (arable), Broadleaf/mixed woodland (semi natural)
Waterbody ID NL36_OWM_014



Other case studies in this subcatchment: Beentjesgraven, Beneden Regge, De Doorbraak, Deurningerbeek, Dinkel Noord, Jufferbeek, Living Vechte-Dinkel, Marswetering, Midden Regge, Oude Bornschebeek... further results


Site

Name Zandwetering
WFD water body codes NL04_SAL_ZANDWETERING
WFD (national) typology R5
WFD water body name Zandwetering
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate Sand
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category 0.1 - 1.0 m³/s
Mean annual discharge (m3/s)
Average channel gradient category Less than 0.001
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources

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
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
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

Biological quality elements

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

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

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Supplementary Information

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