Case study:TEST Deculverting the Texas Valley Stream 1

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Location: 59° 58' 44.87" N, 11° 14' 29.90" E

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Project overview

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Status	Complete
Project web site
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
Main contact user ID
Contact organisation	County Governor of Oslo og Viken
Contact organisation web site	http://https://www.statsforvalteren.no/en/oslo-og-viken/
Partner organisations	NINA, NIVA
Parent multi-site project
This is a parent project encompassing the following projects	No

2. The Texas Valley stream one year after daylighting. July 26th 2017. Photo: Kari Nordkvinne/NIVA.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Texasbekken WFD water body codes 006-189-R WFD (national) typology REL2311 WFD water body name Texasbekken oppstrøms Texasdalen Pre-project morphology Closed culvert Reference morphology Naturally straight Desired post project morphology Naturally straight Heavily modified water body No National/international site designation Norway - Naturreservat Local/regional site designations Protected species present No Invasive species present Yes Species of interest Canadian pondweed (Elodea canadensis ) Dominant hydrology Dominant substrate 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 Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 150150 m <br />0.15 km <br />15,000 cm <br /> Project started 2015/04/06 Works started 2016/04/12 Works completed 2016/11/16 Project completed 2020/02/10 Total cost category 10 - 50 k€ Total cost (k€) Benefit to cost ratio 5 Funding sources Norwegian Environment Agency (Miljødirektoratet) Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 1 - 10 k€ Norwegian Institute for Nature Research (NINA) Berit Köhler Stakeholder engagement and communication Less than 1 k€ Norwegian Institute for Water Research (NIVA) Ingrid Nesheim Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Urbanisation Hydromorphology Freshwater flow regime Biology Fish, Invertebrates Physico-chemical Nutrient concentrations Other reasons for the project Recreation Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Nutrient concentrations Yes Yes No Yes Yes No change PH No Yes No Yes No Inconclusive Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Increased recreation No Yes No Yes No Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://https://www.niva.no/rapporter/overvaking-i-referanseelver Home page for the restoration project Supplementary Information Edit Supplementary Information