Case study:Bijloop

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Location: 51° 32' 34.38" N, 4° 42' 24.91" 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, Water quality
Country	Netherlands
Main contact forename	Martin
Main contact surname	Stamhuis
Main contact user ID
Contact organisation	Waterschap Brabantse Delta
Contact organisation web site	http://www.brabantsedelta.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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The Bijloop-Turfvaart stream system has been heavily modified for peat transport in the 15th century. Since then, it has been optimized for agricultural purposes. The low flow velocity, high water temperature and nutrient load cause a generally unfavourable ecological environment. The water authority has expiremented with removing fewer water plants. To this end, they planted trees lining the stream. Various species were used: black alder, summer oak, hazel, rowan, blackthorn, ash and buckthorn.

Monitoring surveys and results

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In the beginning of the project the stream discharge was too low, so that sludge and leaves piled up in the bed. This caused a high biological oxygen demand and consequently a low oxygen level. As the project developed, a continuous vegetation cover developed, making mowing unnecessary. Black alder and hazel proved especially suitable, since they grow fast. Oxygen levels have become more stable and nutrient runoff into the stream has decreased.

Lessons learnt

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Flow dynamics are important to the success of stream-parallel vegetation planting. In streams with a low discharge, fallen trees and leaves can cause backwater effects and obstruction. If a high flow velocity can be maintained, this will not tend to be a problem. If vegetation does not develop quickly enough, there is a risk of bank instability.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Bijloop WFD water body codes NL25_57a WFD (national) typology R4 WFD water body name Bijloop-Turfvaart Pre-project morphology Reference morphology Desired post project morphology 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 River corridor land use Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m 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