Case study:Marswetering - Revision history

Bas Wullems at 14:45, 26 January 2021

2021-01-26T14:45:26Z

← Older revision		Revision as of 14:45, 26 January 2021
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	{{Case study subcatchment}}		{{Case study subcatchment
			\|Subcatchment=Vecht (Overijssel)
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	{{Site		{{Site
	\|Name=Marswetering		\|Name=Marswetering

Bas Wullems at 14:24, 3 December 2020

2020-12-03T14:24:10Z

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	\|WFD (national) typology=R5,		\|WFD (national) typology=R5,
	\|WFD water body name=Marswetering		\|WFD water body name=Marswetering
			\|Pre-project morphology=Straightened,
			\|Reference morphology=Low gradient passively meandering,
			\|Desired post project morphology=Low gradient passively meandering,
	\|Heavily modified water body=Yes		\|Heavily modified water body=Yes
	\|Protected species present=No		\|Protected species present=No

Bas Wullems at 14:22, 3 December 2020

2020-12-03T14:22:17Z

← Older revision		Revision as of 14:22, 3 December 2020
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	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete
	\|Themes=Habitat and biodiversity, Hydromorphology, Monitoring, Water quality		\|Themes=Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
	\|Country=Netherlands		\|Country=Netherlands
	\|Main contact forename=Sander		\|Main contact forename=Sander
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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 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 water authority has made an attempt to create more variation in morphology and flow structure of the Marswetering by introducing dead wood in the stream. The wood was introduced at five 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 and water level adaptations~~. ~~This page focuses on~~ the ~~introduction of dead wood~~.		\|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 water authority has made an attempt to create more variation in morphology and flow structure of the Marswetering by introducing dead wood in the stream. The wood was introduced at five locations below the water line to create narrower stretches in the stream.
	\|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 stream has a rather low discharge and is therefore less suitable for this type of measures.		Additionally, the banks were divided into a green and a blue zone. In the blue zone, vegetation was regularly removed to ensure flow continuity. In the green zone, vegetation is removed less regulaly and in a way that contributes to a varied flow structure.
	\|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.		Fish passages have also been created in the Marswetering.
			Further efforts are planned to broaden the waterway and recreate meanders.
			\|Monitoring surveys and results=The effect of the measures on the abundance of macroinvertebrate and fish has been monitored. The dead wood experiments did not yield any favourable results, probably because the stream has a rather low discharge and is therefore less suitable for this type of measures.
			Vegetation development is monitored by FLORON.
			Macroinvertebrates are monitored at 3-4 locations per stream as part of a regional project in the Marswetering, Overijssels Kanaal and Beentjesgraven.
			The overall ecological quality ratios of the stream has improved.
			\|Lessons learn=Although the dead wood 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=Marswetering		\|Project title=Marswetering
	}}		}}

Bas Wullems at 13:10, 3 December 2020

2020-12-03T13:10:54Z

← Older revision		Revision as of 13:10, 3 December 2020
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	{{Site}}		{{Site
			\|Name=Marswetering
			\|WFD water body code=NL04_MARS-WETERING
			\|WFD (national) typology=R5,
			\|WFD water body name=Marswetering
			\|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
			}}
	{{Project background}}		{{Project background}}
	{{Motivations}}		{{Motivations}}

Bas Wullems at 13:08, 3 December 2020

2020-12-03T13:08:58Z

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	}}		}}
	{{Project overview		{{Project overview
	~~\|Project title=Marswetering~~
	\|Status=Complete		\|Status=Complete
	\|Themes=Habitat and biodiversity, Hydromorphology, Monitoring, Water quality		\|Themes=Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
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	\|Contact organisation=Waterschep Drents Overijsselse Delta		\|Contact organisation=Waterschep Drents Overijsselse Delta
	\|Contact organisation url=www.wdodelta.nl		\|Contact organisation url=www.wdodelta.nl
			\|Name of parent multi-site project=Building with nature measures in streams
	\|Multi-site=No		\|Multi-site=No
	\|~~Name~~ of ~~parent multi-site project~~=~~Building with nature~~ measures in ~~streams~~		\|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 water authority has made an attempt to create more variation in morphology and flow structure of the Marswetering by introducing dead wood in the stream. The wood was introduced at five 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 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 stream has a rather low discharge and is 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=Marswetering
	}}		}}
	{{Image gallery}}		{{Image gallery}}

Bas Wullems: Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=52.496774441773354, 6.3033017927702195 }} {{Project overview |Project title=Marswetering |Status=Complete |T..."

2020-12-03T13:05:18Z

Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=52.496774441773354, 6.3033017927702195 }} {{Project overview |Project title=Marswetering |Status=Complete |T..."

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{{Case study status
|Approval status=Draft
}}
{{Location
|Location=52.496774441773354, 6.3033017927702195
}}
{{Project overview
|Project title=Marswetering
|Status=Complete
|Themes=Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
|Country=Netherlands
|Main contact forename=Sander
|Main contact surname=Verheijen
|Contact organisation=Waterschep Drents Overijsselse Delta
|Contact organisation url=www.wdodelta.nl
|Multi-site=No
|Name of parent multi-site project=Building with nature measures in streams
}}
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{{Site}}
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{{Motivations}}
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{{Monitoring documents}}
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