Case study:Koningsdiep

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Location: 53° 2' 26.51" N, 6° 3' 3.28" E

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Project overview

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Status	Complete
Project web site	http://https://www.fryslan.frl/beleidsthemas/gebiedsontwikkelingsprojecten_3553/item/koningsdiep_1846.html
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
Country	Netherlands
Main contact forename	Koos
Main contact surname	Koops
Main contact user ID
Contact organisation	Wetterskip Fryslân
Contact organisation web site	http://www.wetterskipfryslan.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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Stream restoration measures in the Koningsdiep aim to create a larger habitat for the species present. The stream discharge was reduced through the creation of a meander, so that a culvert does not have to be closed to prevent downstream water damage. This culvert is important to ensure animals' ability to migrate in the area. A fish passage was created in the meander. Dead wood trunks and branches were introduced in the newly dug-out part to narrow the stream.

Monitoring surveys and results

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The meander has started to get overgrown because of the high nutrient load in the water. The water authority has chosen not to intervene yet, as they expect that this a temporary situation to which the stream will eventually adjust.

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Koningsdiep WFD water body codes NL02L4 WFD (national) typology R5 WFD water body name Koningsdiep Pre-project morphology Actively meandering Reference morphology Straightened Desired post project morphology Low gradient passively meandering 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 Grassland, Broadleaf/mixed woodland (semi natural), Moorland/heathland 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 Edit 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project 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 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 Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information