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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Catchment and 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

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

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Project started
Works started
Works completed
Project completed
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Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
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Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

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Any other monitoring, e.g. social, economic

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Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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