Case study:Gastersche Diep

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Location: 53° 2' 26.11" N, 6° 38' 29.21" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
Country	Netherlands
Main contact forename	Emiel
Main contact surname	Galetzka
Main contact user ID
Contact organisation	Waterschap Hunze en Aa's
Contact organisation web site	http://www.hunzeenaas.nl
Partner organisations
Parent multi-site project	Building with nature measures in streams
This is a parent project encompassing the following projects	No

WFD water bodies in the Hunze en Aa's water authority region. The Gastersche Diep is part of the Drentse Aa water body.

Project summary

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The flow velocity in the stream had become too high, causing bed incision and lower water levels. To stop this effect, almost 100 dead trees and stubs were introduced in the Gastersche Diep, in three 400-metre-long stretches.

Monitoring surveys and results

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Since the introduction of this large quantity of dead wood, water levels have risen between 0.27 and 0.65 m. The stream bed has risen by 0.17 m due to sediment deposition.

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Ems River basin Nedereems Subcatchment River name Drentsche Aa Area category 100 - 1000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Central Plains Dominant land cover Grassland, Intensive agriculture (arable), Broadleaf/mixed woodland (semi natural), Moorland/heathland Waterbody ID NL33DA Other case studies in this subcatchment: Anloërdiepje, Taarlosche Diep, Zeegserloopje Site Edit site Name Gastersche Diep near Drentse Aa WFD water body codes NL33DA WFD (national) typology R5 WFD water body name Drentse Aa Pre-project morphology Actively meandering Reference morphology Actively meandering Desired post project morphology Actively meandering Heavily modified water body Yes National/international site designation Local/regional site designations Nationaal park Drentse Aa Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate Sand River corridor land use Rough unimproved grassland/pasture, Tall herb/rank vegetation, Improved/semi-improved grassland/pasture, Intensive agriculture (arable), 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 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