Case study:TEST Daylighting the Texas Valley stream - Revision history

NIVA DK at 19:59, 2 February 2021

2021-02-02T19:59:39Z

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			\|Monitoring document=Monitoring report for Webinar.pdf
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NIVA DK at 19:57, 2 February 2021

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			\|Element=Nutrient concentrations
			\|Monitored before=No
			\|Monitored after=Yes
			\|Qualitative monitoring=No
			\|Quantitative monitoring=Yes
			\|Control site used=Yes
			\|Result=No change
			}}
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NIVA DK at 19:55, 2 February 2021

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	\|Biological quality elements=Fish, Macroalgae, Invertebrates,		\|Biological quality elements=Fish, Macroalgae, Invertebrates,
	}}		}}
	{{Measures}}		{{Measures
			\|Bank and bed modifications measure=Deculverting,
			\|Floodplain / River corridor=Erosion protection,
			\|Other technical measure=construction of recreational facilities (trails and footbridges),
			\|Social measures=Volunteer engagement,
			}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
	{{End table}}		{{End table}}

NIVA DK at 19:53, 2 February 2021

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	\|Funding sources=Norwegian Environment Agency (Miljødirektoratet), Lillestrøm Municpality		\|Funding sources=Norwegian Environment Agency (Miljødirektoratet), Lillestrøm Municpality
	}}		}}
	{{Motivations}}		{{Motivations
			\|Specific mitigation=Urbanisation,
			\|Biological quality elements=Fish, Macroalgae, Invertebrates,
			}}
	{{Measures}}		{{Measures}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

NIVA DK at 19:51, 2 February 2021

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	\|River corridor land use=Tall herb/rank vegetation,		\|River corridor land use=Tall herb/rank vegetation,
	}}		}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=150
			\|Project started=2015/02/02
			\|Works started=2016/05/08
			\|Works completed=2016/11/22
			\|Project completed=2020/11/23
			\|Total cost category=50 - 100 k€
			\|Funding sources=Norwegian Environment Agency (Miljødirektoratet), Lillestrøm Municpality
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

NIVA DK at 19:48, 2 February 2021

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NIVA DK at 19:42, 2 February 2021

2021-02-02T19:42:17Z

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	\|Project picture=RiverWiki TEST image1.jpg		\|Project picture=RiverWiki TEST image1.jpg
	\|Picture description=2. Newly restored stretch of stream Texas Valley, one year after implementation of restoration measures, i.e. March 2017. Photo: Kari Nordkvinne/NIVA.		\|Picture description=2. Newly restored stretch of stream Texas Valley, one year after implementation of restoration measures, i.e. March 2017. Photo: Kari Nordkvinne/NIVA.
			\|Project summary=Daylighting of a previously culverted stream in a suburban area. The culvert was old and under dimensioned, thus it had to be either exchanged with a larger culvert, or removed. Based on a cost-benefit analysis, the latter was chosen, and the land owner decided on three main goals for the daylighting: 1) improve the water quality to good ecological status, 2) reduce bank erosion after removing the culvert, 3) increase the natural recreational area within this suburban zone.

			The project was planned and prospected in 2015, the daylighting, flood protection and reconstruction of the riparian zone was conducted in 2016, and monitoring was conducted in 2017 and 2020.
			\|Monitoring surveys and results=Assessments of the ecological status based on nutrients, benthic algae, macroinvertebrates and fish were conducted twice, in 2017 and in 2020. The overall ecological status in 2017 and 2020 was bad due to lack of fish. This is due to a fish barrier (culvert) further down. However, macroinvertebrates increased from poor (2017) to good ecological status (2020), and benthic algae showed good status both years, thus these two organism groups had a good effect of the daylighting. Nutrients showed moderate status both years (Tot N and Tot P), which was the same as the upstream reference stretch.

			Embankments were set in place to reduce the risk of bank erosion after daylighting, as this could lead to negative impacts on local buildings and infrastructure. 2 years of continuous monitoring of particle runoff in the daylighted stretch was compared to similar measurements at the upstream open section, and there were no differences in particle runoff from the two stretches.

			To assess the recreational use of the area, the local bicycle club registered number of people using the new pathway and bench area every Saturday 10:00-14:00 from May-Oct 2017 and 2020. This showed an initial peak of users right after opening, then a slight decrease in 2017. However, the use was clearly higher in 2020, and the area was used by at least 9 people in the time registered every weekend in 2020.
			\|Lessons learn=Opening the stream has had very good reviews from the local residents and on the ecological status for benthic algae and macroinvertebrates. The bank erosion measures seem to work well after installment, but were built in a period of heavy rain, causing surplus erosion that could have been avoided. If fish status is to be improved, then the downstream culvert also needs to reopen. The costs of these measures were similar to building a new culvert, but yearly maintenance costs have so far been lower, and the recreational benefits are positive. The local bicycle club also have some ownership of the area now, through their monitoring, which has resulted in their free involvement in keeping the area free of garbage.
	\|Project title=TEST_Daylighting the Texas Valley stream		\|Project title=TEST_Daylighting the Texas Valley stream
	}}		}}

NIVA DK at 19:35, 2 February 2021

2021-02-02T19:35:00Z

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	{{Project overview		{{Project overview
	~~\|Project title=TEST_Daylighting the Texas Valley stream~~
	\|Status=Complete		\|Status=Complete
	\|Themes=Economic aspects, Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Spatial planning, Water quality, Urban		\|Themes=Economic aspects, Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Spatial planning, Water quality, Urban
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	\|Contact organisation=County Governor of Oslo og Viken		\|Contact organisation=County Governor of Oslo og Viken
	\|Contact organisation url=https://www.statsforvalteren.no/en/oslo-og-viken/		\|Contact organisation url=https://www.statsforvalteren.no/en/oslo-og-viken/
			\|Partner organisations=NIVA,
	\|Multi-site=No		\|Multi-site=No
			\|Project picture=RiverWiki TEST image1.jpg
			\|Picture description=2. Newly restored stretch of stream Texas Valley, one year after implementation of restoration measures, i.e. March 2017. Photo: Kari Nordkvinne/NIVA.
			\|Project title=TEST_Daylighting the Texas Valley stream
	}}		}}
	{{Image gallery}}		{{Image gallery}}

NIVA DK: Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=59.979076201741584, 11.241601638935451 }} {{Project overview |Project title=TEST_Daylighting the Texas Valle..."

2021-02-02T19:29:45Z

Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=59.979076201741584, 11.241601638935451 }} {{Project overview |Project title=TEST_Daylighting the Texas Valle..."

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{{Case study status
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{{Location
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{{Project overview
|Project title=TEST_Daylighting the Texas Valley stream
|Status=Complete
|Themes=Economic aspects, Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Spatial planning, Water quality, Urban
|Country=Norway
|Main contact forename=Kari
|Main contact surname=Nordkvinne
|Contact organisation=County Governor of Oslo og Viken
|Contact organisation url=https://www.statsforvalteren.no/en/oslo-og-viken/
|Multi-site=No
}}
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