Case study:Removal of a pond weir in a tributary of Petersbach

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Location: 48° 58' 58.16" N, 7° 15' 2.35" E

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Project overview

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Status	Complete
Project web site
Themes
Country	France
Main contact forename	Julien
Main contact surname	Prinet
Main contact user ID
Contact organisation	ONF – direction forêt Alsace
Contact organisation web site	http://www.onf.fr
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Saumuehle stream is a 1,5 Km tributary of the Petersbach river, located in the Petite Pierre Nord forest. It is a firs class fish stream. In 1980, the Saumuehle pond (12000 m2) was created for recreational fishing. The pond cause warming waters downstream and the weir is an obstacle to ecological continuity. After a few years, the dam, made with soil from the excavation of the pond, lost its seal and the water level had dropped, leading to a gradual filling of the pond. Under an Interreg project which aims to improve the condition of the river in the forest, this site was chosen as a pilot site. The work takes place in several phases. At first, the pond is drained in order to remove the drain boards After conducting a fishing rescue and temporary diversion of the river to a side ditch, materials of the dam are moved on the edge of the pond. Then, reprofiling sloping instead of the dam is made. A lateral pond is created to hold the presence of amphibians observed on the site.

Monitoring surveys and results

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This restoration has reconnecting 1400 linear meters of stream. After draining the pond, the river quickly regained a sinuous channel. The substrate is unclogged and coarse aggregate appeared; also riffles and mouilles appeared upstream. A post-work fishing monitoring shows clearly a recolonization of the brown trout upstream. In 2008, during winter floods, the bed of the stream moves a few meters on the left bank, where the new pond was created. This was quickly picked up by the river. This has proven that the pond was created too early: It would have to wait until the stabilization of the river bed. This pond will be recreated when the bed is completely stabilized.

Lessons learnt

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Image gallery

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The Saumuehle Pond before works.

The Saumuehle pond weir removal, during works in 2007.

The Saumuehle stream, in 2008, 6 months after pond drainage.

The coarse substrate reappeared after works (March 2008).

The Saumuelhe stream in December 2009, two years after restoration works.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rhin-Meuse River basin Subcatchment River name Petersbach Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Highlands Dominant land cover Waterbody ID Site Edit site Name Petite-Pierre Nord forest - Butten WFD water body codes FRCR437 WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Parc naturel régional des Vosges du Nord Protected species present Yes Invasive species present No Species of interest brown trout, sculpins, minnows and white-clawed crayfish Dominant hydrology Dominant substrate River corridor land use Plantation forestry 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) 100100 m <br />0.1 km <br />10,000 cm <br /> Project started Works started 2007/09/01 Works completed 2007/11/01 Project completed Total cost category Total cost (k€) 1,1361,136 k€ <br />1,136,000 € <br /> Benefit to cost ratio Funding sources EU Interreg IIIA (50 %), Agence de l’eau (25 %), conseils généraux du Bas-Rhin et du Haut-Rhin (15 %), direction régionale de l’environnement (DIREN) (5 %) Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Sycoparc, Office national de l’eau et des milieux aquatiques (Onema) - service départemental, direction régionale de l’environnement (DIREN), agence de l’eau. Stakeholder engagement and communication Works and works supervision 1,1361,136 k€ <br />1,136,000 € <br /> Sycoparc, Office national de l’eau et des milieux aquatiques (Onema) - service départemental, direction régionale de l’environnement (DIREN), agence de l’eau. Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Continuity of sediment transport Biology Fish: Abundance Physico-chemical Temperature Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal, Pond drainage 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 Fish Yes Yes No Yes No Improvement 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 Case study description by ONEMA (French National Agency for Water and Aquatic Environments) (in French) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information