Bezirksregierung Arnsberg

Düren, Germany

Bezirksregierung Arnsberg

Düren, Germany
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Staiger R.,Bochum University of Applied Sciences | Albuscheit H.,Tim Mausbach Judith Stadt Bochum | Grafrath T.,Tim Mausbach Judith Stadt Bochum | Heitmann S.,Bezirksregierung Arnsberg | And 3 more authors.
ZFV - Zeitschrift fur Geodasie, Geoinformation und Landmanagement | Year: 2017

The geometrical quality of the measurement equipment for cadastral purposes needs to be checked and proofed on a regular base. Therefore the state of North Rhine-Westphalia required until now a yearly quality check of the component distance measurement on a pillar based calibration line. The new test procedure, which is described in this paper, is following a different philosophy. In the so-called system-check all relevant measurement components, which contribute to the result are proofed. In a two-dimensional test field with known coordinates a procedure called «Bochumer Verfahren» is applied. In a first step the tacheometer is setup and oriented via four known points (Free Station). In the next step additional points are measured and coordinated in the given coordinate system. The check is successfully passed when all horizontal distances between the nominal and coordinated points are smaller than 1 cm.

The District Government Arnsberg, Dept. 6 commissioned the working group (ARGE) IHS/ahu AG, with the delimitation of sources of significant pollution from ore mining and the description of potential measures to be taken in the context of NRW's management planning. The project was undertaken on behalf of the Ministry for Climate Protection, Environment, Agriculture, Nature Conservation and Consumer Protection of the German State of North Rhine-Westphalia (MKULNV). A central part of the project was a consultation with the administrative districts, including in-situ inspections, which covered the period from July to December 2011. As part of the project, the countrywide data on mining and water management has been processed and analyzed. The assessment of the significance of suspected sites was carried out in cooperation with the project advisory group, using a points system. Based on the ranking of the number of points scored, the major sources of contamination were identified.

Petri R.,Bezirksregierung Arnsberg | Buschhuter K.,Geologischer Dienst NRW | Dahmen D.,RWE AG
World of Mining - Surface and Underground | Year: 2014

In connection with the amendment to the Inden II Lignite Mining Plan (residual lake instead of backfilling) stability tests for the planned residual-lake slopes have already been performed early on to demonstrate the general feasibility of a lake in the envisaged size, taking also account of possible impact from earthquakes. The investigation areas were selected with a view to the objects located in the environs of a future lake that require protection (surrounding villages, A 4 motorway). The calculations that were performed using conservative shear- strength values (minimum values) invariably indicate sufficient stability. According to today's knowledge as reflected in the geological, hydrological and geomechanical records the examined slopes are to be considered stable for the time needed to fill the residual lake and in their permanent final state. This is also true if effects of earthquakes are considered. As part of the investigations the stability of the examined temporary rim slopes was also evidenced for the duration of extraction activities, so that the stability of the slopes is ensured in all areas at all times. The planned 1:20 inclined wave-action zone ensures that the final, fully filled lake is hydromechanically stable and can withstand wind-generated waves. Potential erosion or cliff formation at the slopes caused by wind-generated waves at the filling stage would be fixed, if necessary, within the scope of slope maintenance. The filling phase will be closely monitored (monitoring of slopes, hydrogeological measurements). Further studies of the opencast mine rim slopes, the design and stability of the residual lake's single and part-slopes and the local and temporal use of the residual-lake slopes will be conducted at the next planning and approval stages of the proceedings under mining law. Specific investigation areas and dates are included in the collateral requirements of the Master Operating Plan approval dated 20 December 2012. The necessary records are to be submitted by the mining company to the mining authority in due time. Detailed examinations as required by the utilisation concept will also be conducted in subsequent processes. This phased approach safeguards that the latest geological, hydrogeological as well as geomechanical findings and the current state of the art are considered in further planning activities and that the stability of slopes is ensured at all times.©GDMB Verlag GmbH.

The rehabilitation of the former operating surfaces of the opencast lignite pits in the Rhenish mining area has traditionally attracted great attention. A closely graduated hierarchy of approval procedures and the associated implementation guidelines of the supervisory authorities ensure that, even before initial mine development, the various extraction projects are thoroughly studied, planned and regulated all the way to rehabilitation. Hence, all phases of opencast-mine operations are already aligned toward sustainable and safe recurvation alongside the function of rawmaterial extraction. This recultivation is closely monitored by the mining-supervision authority and - in line with changes in underlying social, ecological and technical conditions - is adapted as needs require. This also includes a continuous response to the latest rules governing recultivation and soil stability to ensure sustainable rehabilitation at a high ecological, technical and safety level by way of regular updates. As regards stability issues, any technical questions regarding the further development of the regulatory framework are discussed in the permanent "Arbeitskreis Gebirgsmechanik im Rheinischen Braunkohlenbergbau" (Working Circle for Rock Mechanics in Rhenish Lignite Mining) initiated by the Arnsberg regional government. This body - comprising representatives of the mining authority, the Geological Service and the mining company, supplemented from case to case by experts from the worlds of science and research - has proved to be the ideal instrument hitherto for bundling the specialist knowledge in this discipline available at the various facilities. With the end of mining supervision, jurisdiction for the recultivated landscapes of the Arnsberg regional government, too, comes to an end. After implementation of the currently applicable finaloperating plan, the recultivated former opencast-mine areas are subject to the supervision of the technical authorities in charge. This is also true of the water surfaces and high dumps created in the Rhenish mining area. Since these recultivation features are of special interest on stability grounds, the Working Circle for Rock Mechanics in Rhenish Lignite Mining has undertaken a broad-based evaluation of this subject. The results show that deformations in the slope system have been noted in only two cases and that no danger emanated from them for people or for material goods. Hence, the principle pursued by all those involved in the Rhenish mining area, viz. aligning extraction projects, from the very start, toward recultivation, has proved to be a success. Planning and operation of the Inden, Garzweiler and Hambach opencast mines, too - where, within the scope of the recultivation process, lakes are provided for in the residual voids left after depletion - have been and are being managed along the lines of these principles. For the landscapes emerging in future, this means not only a broad potential for local recreation and ecology, but also high safety standards for the population and future users.

The stability of temporary mine-rim slopes and permanent final slopes is ensured in NRW by the systematic application of the Guideline for Stability Examinations (RfS) subject to the supervision of the Office of Mining. The Guideline provides for a so-called "six-eyes principle" throughout in which the mine operator evidences the stability in a Special Operating Plan; the NRW Geological Service as competent technical institution performs a geo-technical examination of the stability; and the Office of Mining, taking specific account of technical and safety aspects, issues its operating-plan approval and carries out official supervision. This principle of the RfS can likewise be found in the Geome-chanics Working Group in the Rhenish Lignite-mining Area, set up in 2009, which views itself as a permanent institution and has important geomechanical topics processed by the specialists involved. Organizationally, it consists of a core working group and a coordination group. Its activities ensure structured and comprehensive processing of all issues of relevance in geomechanics for opencast lignite mines in NRW.

Welz A.,Bezirksregierung Arnsberg | Weltermann P.,Geologischer Dienst NRW Landesbetrieb | Henscheid S.,Geologischer Dienst NRW Landesbetrieb
ZFV - Zeitschrift fur Geodasie, Geoinformation und Landmanagement | Year: 2011

For one year the online-information-system «Danger potentials of the underground in NRW» informs property owners, house builders, architects, authorities on the building areas and planning agencies, about potential dangers of the underground. The system is a modern E-Government-Application that provides the user an opportunity to achieve a general idea of established or possible danger potentials fast and free of charge. The system is accessible via and allows the user to obtain a preliminary information without contacting an authority. An online-application form enables the user to request information relating to the property. Now the information system received the GIS Best Practice Award 2010 by the DVWe. V. at the INTERGEO® 2010 in Cologne.

Experts inform about efforts being made to secure final and border slopes in the openpit lignite mines of the Rhenish mining district in Germany from the perspective of the mining authority. The official approval and monitoring of lignite mining operations in the district are the duties and responsibilities of the District Government Arsberg, Department of Mining and Energy in North Rine-Westphalia. The Department of Mining and Energy is responsible as the mining supervisory authority for the entire state. The government office regulates and monitors the safe and secure construction of open-pit slopes under the scope of responsibilities of mining supervision.

Large dam plants have a high hazard potential. A failure of a dam structure can result adverse consequences such as loss of life, economic loss (including property damage) and environmental impact. More than 360 dam plants in Germany meet the ICOLD criteria "Large Dam". 440 dams and flood control reservoirs have a storage capacity of more than 300 000 cubic meters. The surveillance and safety of dam plants is regulated in Germany on a federal state level. It is up to the states to define legal and technical safety regulations. The content and scope of official dam inspection in North Rhine-Westphalia is shown for the district government of Arnsberg. There the surveillance authority complets and checks the self-surveillance of the dam owners and operates on the four-eyes principle. The official dam inspection is considered a necessary part of a redundant dam safety culture.

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