]> 2026-04-20T04:52:51+00:00 Flood detention basin (HRB) Ickern-Mengede 500 en Approved 0.5 - 2 m Less than 0.001 5 - 10 m removal of bottom slab formwork Adding sinuosity Yes No No Awaiting results Yes Invertebrates,No,Yes,Yes,Yes,No,Awaiting results Fish,No,Yes,Yes,Yes,No,Awaiting results Macrophytes,No,Yes,Yes,No,No,Awaiting results Invertebrates Fish Macrophytes Yes No Channel naturalisation Improvement of channel morphology Enabling dynamics Meandering channel Emschergenossenschaft Central Plains Yes No Yes true Yes No No Awaiting results Yes Structure & condition of riparian/lake shore zones,No,Yes,Yes,No,No,Awaiting results Channel pattern/planform,No,Yes,Yes,No,No,Awaiting results Width & depth variation,No,Yes,Yes,No,No,Awaiting results Structure & condition of riparian/lake shore zones Channel pattern/planform Width & depth variation No HRBDoMengede VegKart 18.7.2013 006.jpg HRBDoMengede VegKart 18.7.2013 091.jpg View on one of the basins View into basin nr. 2, with deadwood and <i>Salix spec. </i> visible Yes Emschergenossenschaft Emschergenossenschaft 51.582936608828,7.3575782775879 EGLV Mechthild Emschergenossenschaft Semrau removal of bottom slab formwork, Adding sinuosity,,Increase water retention area, Connection to wider floodplain, Wetland habitat,Channel naturalisation, Improvement of channel morphology, Enabling dynamics, Meandering channel, ,,Community involvement,, Emschergenossenschaft 13139 Yes Yes No Awaiting results Yes Nutrient concentrations,Yes,Yes,Yes,Yes,No,Awaiting results Oxygen balance,Yes,Yes,Yes,Yes,No,Awaiting results PH,Yes,Yes,Yes,Yes,No,Awaiting results Salinity,Yes,Yes,Yes,Yes,No,Awaiting results Temperature,Yes,Yes,Yes,Yes,No,Awaiting results Nutrient concentrations Oxygen balance PH Salinity Temperature Yes Aerial view of the HRB Ickern-Mengede during construction Emschergenossenschaft 560EmscherKm48,5-57,7 13041455 Kopie.jpg 2005-01-01Z 2453371.5 Complete Part of the integrated river basin management for the Emscher Region (865 km², 2.700 inhabitants/ km²) is the revitalization of the river Emscher and its tributaries. Due to industrialization the waterbodies were systematically developed as open wastewater sewers in the beginning of the 20th century. Economic and technical alternatives such as closed sewer systems could not be implemented due to constant subsidence caused by coal mining. Momentarily, the river system is being restructured in order to enable the Emscher to once again be a fully functioning, continuous water-based ecosystem with typical topology and vegetation. An ecological concept based on the assumption of a non-interrupted river as a connection from the source to the mouth has been developed. Studies on the feasibility of restructuring the Emscher show, that due to coal mining, industrial impacts and population changes the “original” conditions can never be reached again. It will not be possible to return the Emscher to its original, meandering state. Therefore, the reference conditions are no direct goals for the river restoration, but they give orientation in the planning procedure. One of the first hot spots that has been put into practice is the HRB Ickern-Mengede. The HRB comprises an area of 30 ha, where a typical lowland river with natural substrats, features and vegetation can be formed. A varied mosaic of biotopes, which are typical for floodplains (alder floodplain forest, sedge, typha and phragmites reed, floodgrass and potamogeton) is expected to develop. Most importantly, the basin can hold a volume of 1,1 km³ to protect the downstream riparian communities. After the ecological restoration of the Emscher basin, it won't be able to discharge floods as quickly, hence the upstream flood protection must be enhanced. Two million m³ of native soil had to be excavated. 450 000 m³ of this have been used to build a landscape monument between the basin and the close highway, thereby reducing noise pollution for the inhabitants of the basin and the close area. It has also been made accessible for the public as a lookout. The river Emscher will be integrated into the basin, hence even smaller floods will reach the floodplain that has been created. Parts of the basin will be flooded about 80 days a year. Since the bottom of the HRB is uneven, parts of it will constantly be a body of standing water, whereas some elevated parts will be islands even during high floods. This diversity of topologic forms will lead to a great diversity in habitats - and therefore species. As of now, the basin is still divided into three smaller parts by the dyked Emscher, because it needs to be separated from the wastewater which the Emscher is still carrying. Only during high floods diluted wastewater will run over the dykes to flood the basins. Once the wastewater is fully removed from the river, there will be a slight remodelling of the basins (removal of the dykes), thus creating the possibility for the river to mold its own body and have access to the floodplain. Public participation process during the planning phase, 2006 a public workshop was organised by the EG on the design aspects of the construction (e.g. bike trails). Flood detention basin (HRB) Mengede flood detention basin (hrb) mengede Yes Rhine Rhine Increase water retention area Connection to wider floodplain Wetland habitat Emscher emscher HRB Ickern-Mengede hrb ickern-mengede Community involvement Emschergenossenschaft 865 Emscher DE_NRW_2772 Habitat and biodiversity Hydromorphology 62000 more than 10000 k€ Type 15: small sand-dominated lowland river DE_NRW_2772_O Emscher 43700 more than 10000 k€ Emschergenossenschaft 2013-12-31Z 2456657.5 2010-01-01Z 2455197.5 2014-05-14T12:47:07Z 2456792.0327199 Flood detention basin (HRB) Ickern-Mengede 2019-01-02T16:39:18Z 2458486.1939583 Flood detention basin (HRB) Ickern-Mengede 500 1 plainlist 5 [[Category:Case study]] [[Project title::!Flood detention basin (HRB) Mengede]] [[Subcatchment title::Emscher]] Flood detention basin (HRB) Ickern-Mengede# QUERY468092912ff60c8dda9f4abff70725f8