Case study:De Doorbraak

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Location: 52° 18' 48.01" N, 6° 37' 5.22" E

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Project overview

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Status	In progress
Project web site	http://www.vechtstromen.nl/buurt/gemeenten/almelo/doorbraak/
Themes	Habitat and biodiversity, Hydromorphology, Water quality
Country	Netherlands
Main contact forename	Maarten
Main contact surname	Zonderwijk
Main contact user ID
Contact organisation	Waterschap Vechtstromen
Contact organisation web site	http://www.vechtstromen.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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De Doorbraak is a newly created stream near Almelo. Its creations has several purposes. In terms of water quantity, the stream helps create more space for inundation, so that there is less of a need to discharge water out of the area. This is supposed to help retain more water in the region in wet periods and prevent drought in dry periods. De Doorbraak is also part of a plan to improve the water quality of the Regge basin. It contributes to a separation of urban and rural waters, so that less polluted water ends up in the Regge. Finally, it provides and ecological link between Twente in the northeast and the hills of the Sallandse Heuvelrug in the southwest. The topsoil of this stream valley was removed over a length of 13 km and a width of 50 m. This created a large area that the stream can inundate. Abandoned meanders and pools were conncted to the main stream. Vegetation removal is managed by grazers, with additonal mowing, if necessary.

Monitoring surveys and results

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The bank vegetation is developing well and resembles wetland vegetation. The exotic plant Crassula helmsii poses a risk, as it might dominate other species. So far, grazers have not been sufficient for removing undesirable vegetation. Trees need to be cut regularly.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Doorbraak WFD water body codes NL05_Exoscheaa WFD (national) typology R6 WFD water body name Exosche Aa_Doorbraak Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest 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) 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