Bad Münstereifel is a town in the district of Euskirchen, in North Rhine-Westphalia, Germany. With its 51 districts and about 17,300 inhabitants (as of Dec. 2022), the urban area covers a total area of 150.83 km ², of which about 60% is forested. With 115 inhabitants per km ², the city of Bad Münstereifel is more likely to be classified as sparsely populated (for comparison: the district of Euskirchen = 154 p.e./km ², North Rhine-Westphalia = 532 p.e./km ², Lower Saxony = 171 p.e./km ², Saxony-Anhalt = 108 p.e./km ²). The catchment areas (EZG) of the two main waters Ahr and Erft divide the urban area of Bad Münstereifel into two large areas. In the urban area of Bad Münstereifel there are many waters, which were damaged to varying degrees by the floods of July 2021. The sustainable restoration of these waters (M220 - M264) has been anchored in the reconstruction plan (WAP) of the city of Bad Münstereifel. For the optimal organisation of this task, the respective water systems (project spaces) were broken down into individual measures (M) or into groups of measures (MV). The network of measures MV2 includes the waters (project areas) of Brömmersbach (M223), Lamersbach (M239) and Seldesbach (M262). The Lamersbach and the Seldesbach are right-sided tributaries of the main water Buchholzbach (sometimes also referred to as Escher Bach) and flow above or below the district Berresheim into these. On the other hand, the Brömmersbach is an influx of the Armuthsbach and has been assigned to the MV 2 for territorial and organisational reasons. In the further course also the Buchholzbach flows into the Armuthsbach, which flows in the Rhineland-Palatinate locality of Schuld in the Ahr. The Buchholzbach (M224) itself is not part of these restoration measures. All lengths and heights of the mentioned waters refer only to the urban area of Bad Münstereifel. The project space Brömmersbach (M223) comprises 6 sub-areas. The main water is the 4.06 km long Brömmersbach, which has a gradient of 4%. The 1.42 km long Rothsiefen is the next inflowing component. This overcomes a height difference of 77 m, which corresponds to a gradient of 5%. The Blinderter Bach is 1.38 km long in the urban area. The height difference is 91 m (gradient approx. 4 %). An unnamed tributary (NG) is another tributary to the Brömmersbach. This tributary is only 680 m long. With a height difference of about 56 m, it has a steep gradient of 8%. A further component of the project space M223 is the 1.37 km long squatting sieve with a height difference of 89 m. This corresponds to a gradient of approximately 6%. After taking up these numerous tributaries, the Brömmersbach flows into the Armuthsbach. This stream is 1.31 km long in the city of Bad Münstereifel. With a height difference of only 17 m, this area has a very low gradient of only 1%. The project area Brömmersbach (M223) thus has a total length of 10.22 km. The 2nd Part of the MV2 is the 3.03 km long and flowless Lamersbach (M239) with a height difference of 117 m, which corresponds to a gradient of about 4%. The Seldesbach (sometimes referred to as Seelbach) with its tributary Billsiefen is the 3. Part of the network of measures 2. With a length of 3.98 km, an altitude difference of 176 m and a gradient of 4%, the Seldesbach is an average body of water. On the other hand, the Billsiefen, which is only 620 m long and has a height difference of 63 m, has a very steep gradient of about 10%. The MV2 network of measures is approximately 17.85 km long in total and has an average gradient of 5.1%. Only in the project area Brömmersbach (M223) is a nature reserve designated. The water courses of the entire Blinderter Bach and the entire Brömmersbach are assigned to the nature reserve EU-164 "Brömmersbach". This also applies to the entire area of the Armuthsbach (in the urban area of Bad Münstereifel) up to the confluence of the Buchholzbach. FFH areas are not designated in the area of MV2. The waters of the project areas (outside the localities of Esch, Nitterscheid, Mutscheid, Ellesheim, Sasserath and Ohlerath) of Measure Network 2 are completely located in landscape protection areas (LSG). All watercourses of the MV2 are mostly located in forest areas. The watercourses are characterized by some crossings of roads and paths, which were made as bridges or passages. These hydraulic systems, especially the passages, were partially severely damaged or destroyed. This level of damage also applies to the entire water system. In particular, deep erosion, sedimentation, bank erosion, fall trees, landslides and embankment demolitions have occurred. Waste or rubbish was also washed up. The aim of the entire measure is the sustainable and close-to-nature restoration of the waters in the area of the network of measures, so that in the future these enormous damage can be avoided or reduced in the event of similar events. In particular, the outlets shall be repaired, renovated or rebuilt if necessary. The design of the passages shall be verified on the basis of the findings of the 2021 heavy rain event and, where necessary, these structures shall be upgraded accordingly to prevent further failure. When restoring the entire course of the stream, particular attention must be paid to a possible renaturation or self-dynamic development of the water while respecting sustainable nature conservation. Regulatory coordination and the resulting requirements or requirements must be implemented. The landscaping accompanying plan, the engineering structures, the surveying accompanying the planning and the geotechnics are part of the planning services according to HOAI.
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