Case study:Historic Mill Restoration Project

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Location: 54° 54' 46.21" N, 8° 50' 21.08" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Habitat and biodiversity, Social benefits
Country	Denmark
Main contact forename	Hans
Main contact surname	Ole Hansen
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Area of the project

Project summary

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Reducing the risk of flooding, tackling subsidence and improving access for fish was dealt with by removing sluice gates and installing a weir allowing fish to swim over more easily. Retaining the historic mill and mill pond were central to the scheme. Economic, social and environmental benefits have been reported in a project that dealt sensitively with the cultural heritage at the site. Works: 1. The mill pond and river were separated with a sheet-piled, concrete-faced weir. Flood banks were set back to increase capacity for flood waters. 2. Sluice gates and the fish ladder upstream of the mill bridge were removed. The millpond was retained as a functioning nursery area for fish. 3. Downstream of the mill, spawning grounds were formed by creating areas of shallower water using gravel (riffles). Resting areas (backwaters) were created and an otter pass was built under the bridge. 4. A new access point downstream of the mill was made for the Tønder Rowing Club to minimise disturbance to nature. 5. 700m of wetlands was created downstream of Tønder to create a wider nature corridor. This has been very popular with walkers and local people. Benefits: Historic mill retained; Aesthetic improvements have led to an increase in local house prices; Public access to nature improved - wetland walk; Balanced project aims with recreational needs; Improved river habitat; Fish pass more freely past the mill; Passage for houting has been restored.

Monitoring surveys and results

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Lessons learnt

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• Taking into account the historic context of the site, the project was delivered sensitively. • The legacy of the project will benefit wildlife and people in a number of ways (access to nature, recreation).

Image gallery

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Lateral sheet piling used to create the weir

Sheet piling faced with concret

The structure once vegetated

Cultural legacy: Historic Mill retained

Bachmanns Mill Pond - after restoration (1)

Bachmanns Mill Pond - after restoration (2)

Bachmanns Mill Pond - after restoration (3)

Bachmanns Mill pond - before restoration

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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