Case study:Snelle Loop

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Location: 51° 30' 31.79" N, 5° 46' 20.06" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Monitoring
Country	Netherlands
Main contact forename	Bram
Main contact surname	Spierings
Main contact user ID
Contact organisation	Waterschap Aa en Maas
Contact organisation web site	http://www.aaenmaas.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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After the removal of a weir, the stream's flow velocity had become uniform, with little variation in substrate and macroinvertebrates as a consequence. Ten packages of wood were introduced into the stream, in different configurations.

Monitoring surveys and results

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Students of the HAS Hogeschool have found that the measures have had a positive effect on the ecology. There is now more diversity in macroinvertebrates, including the common clubtail and certain heteroptera species. Hydromorphological effects were positive as well. The wood packages have created more variation in flow velocity and substrate. The backwater effects of the wood created a more favourable hydraulic gradient in the stream. It also requires much less maintenance now. The large improvement in ecological status may also be related to the increased shading, but it is still too soon to conclude that.

Lessons learnt

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Snelle Loop WFD water body codes NL38_2K WFD (national) typology R4 WFD water body name Esperloop & Snelle Loop Pre-project morphology Artificial channel Reference morphology Artificial channel Desired post project morphology Artificial channel 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 Improved/semi-improved grassland/pasture, Intensive agriculture (arable) 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 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