In this thesis was presented Nové Heřminovy dam with basic parameters. Requirements on bottom outlets and intake objects are presented as well. Analysis of used valves on all dams in Czech Republic was done as an underlay for suggestions of bottom outlets in this thesis. The main task was to suggest three variations of bottom outlets. Differences are in number of outlets, dimensions, placing and valves. Then variation of intake objects. Each of variation was verbally described and filled with calculations.

Orientador: Cesar Augusto Moreira / Resumo: Uma barragem de rejeitos é constituída por uma barreira física, cuja função é a acumulação de produtos residuais do processo industrial de beneficiamento mineiro. Os métodos de projeto para barragens de rejeitos diferem das barragens de retenção de água pela construção do barramento em diferentes etapas. Deste modo, os problemas de estabilidade em uma barragem são de grande importância, principalmente quando se trata de barragens construídas para armazenamento destes rejeitos de mineração, uma vez que a possibilidade de falhas não apenas ameaça a segurança das pessoas e da propriedade industrial, mas também pode causar impactos ambientais substanciais. No Estado de Minas Gerais, aproximadamente 30 km a sudoeste do município de Caldas, está localizada a Mina Osamu Utsumi de responsabilidade das Indústrias Nucleares do Brasil (INB), a qual tem um sistema para contenção de rejeitos provenientes da exploração e processamento de urânio, atualmente desativado. O Sistema consiste em uma barragem de rocha e terra a qual apresenta a existência de surgências no maciço rochoso à jusante do barramento, cujo fluxo ocorre em sistema fraturado. O objetivo do trabalho é reconhecer possíveis zonas de fluxo no interior e na base da barragem por meio de um conjunto de ensaios geofísicos de eletrorresistividade adquiridos com a técnica de tomografia elétrica através de modelos de inversão 2D e modelamento 3D. Foram adquiridas 5 linhas de tomografia elétrica com espaçamento entre eletrodos de 6 m... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: A tailings dam is constituted by a barrier, whose function is the accumulation of residual products from the mining beneficiation industrial process. Project methods for tailings dams differ from water retention dams by the construction of the dam in different stages. Thus, the stability problems in a dam are of great importance, especially when it comes to dams built for the storage of these mining waste, since the possibility of failures not only threatens the safety of people and industrial property, but also cause negative and substantial effects to the local environment. The Osamu Utsumi uranium mine, administrated by the state company Industrias Nucleares do Brasil (INB), is located 30 km southwest of Caldas, in the State of Minas Gerais, and its contention system of tailings, generated by the exploration and processing of uranium ore, is currently out of operation. The system is composed of a rock-soil dam, which presents the existence of water upwellings downstream in the bedrock, with water flux confined in fractures. This research aims the recognition of possible flux zones into the base of the dam through geophysical surveys applying DC Resistivity, in addition to Electrical Resistivity Tomography technique in the generation of 2D inversion models and 3D modeling. The acquisition was composed of five lines of electrical resistivity tomography with 6 m of spacing between electrodes, using Schlumberger array. The results are presented by 2D and 3D geophysical models ... (Complete abstract click electronic access below) / Mestre

This descriptive essay aims to develop constructivist Role theory. Specifically, it examines the potential of applying role analysis to a case of two types of actors; marginalized citizens and their state decision makers. There has previously been little role analysis applied to domestic political settings, as opposed to internationally between states. Therefore, research has been encouraged in this area. The selected empirical case is the controversial Bakun hydroelectric dam project in Sarawak, Malaysian Borneo. It involves the resettlement of the marginalized indigenous Orang Ulu people and is driven by the Sarawak state government. By analyzing the role conceptions and norms of these actors, together with the concept of power, a new perspective on their relationship is developed. The successful application of Role theory in this new setting and case is a contributing point of the study. The role analysis is conducted using a qualitative critical text analysis method; an analytical framework is established with which the actors’ roles are retrieved from the text material. The results are then analyzed, and the conclusion of the case study is that the actors have incoherent conceptions of their roles and norms, leading to a conflict between the two in which the government has the upper hand due to (illegitimate) power structures.

Continuing development of the Virginia Tech campus is increasing downstream flooding and water quality problems. To address these problems, the University has proposed the construction of a stormwater management facility to control the quantity and quality of stormwater releases to Strouble Creek, a tributary of the New River. The overall goal of this project is to design a stormwater management facility proposed for the Virginia-Maryland College of Veterinary Medicine at Virginia Tech in Blacksburg, Virginia that will reduce present and anticipated downstream flooding and water quality problems. Specific objectives of the project are: * control of flooding in lower areas by reducing the peak discharge while disturbing existing wetlands as little as possible, * address removal of major NPS pollutants such as total phosphorus (TP), total nitrogen (TN), metals, organic compounds related to petroleum and gasoline, and suspended sediment (SS) from stormwater runoff, and * design of a dam system that is able to withstand all driving forces and constructed in accordance with governing regulations. The design requirement to limit wetland disturbance below one acre was maintained. The requirement set by officials of Virginia Tech is based on the Nationwide Permit 26 of the Wetland Regulations. An individual permit process is thus avoided. Considering this demand, however, the freedom of the stormwater management facility design was significantly restricted. Resulting from the previous restrictions mentioned, the facility will include two ponds in series - a lower, dry pond and an upper, wet pond. The stormwater management system is designed to reduce the peak discharge. The dry pond is designed to detain water only for a short period of time, as opposed to the wet pond which is designed to retain water, thereby maintaining a permanent pool of water, and to change the characteristics of runoff. The wet pond was chosen to be of an Extended Detention wetland type. Aspects such as the availability of suitable area and detention volume governed the decision to make use of this type of stormwater wetland. The constraint on a maximum possible water surface elevation due to the Veterinary School1s road embankment, which crest elevation is at 2023 ft, was considered in the design. The stormwater management facility was designed to meet water quantity control requirements and to address water quality benefits. Storm water management regulations intending to mitigate the adverse effects of land development to streams and waterways were met. Requirements to limit peak discharges from 2-year and 10-year events to existing discharge levels were achieved. Several outlet structures for each of the ponds were investigated. The structures proposed are a perforated riser/broad-crested weir for the wet pond and a proportional weir for the dry pond. They were chosen as a result of analyses on hydraulic performance, maximum water surface elevations, drawdown times, peak discharge rates, and pollutant removal capabilities. The average pollutant removal capability of 75% of TSS, 45% TP, and 25% TN for an extended stormwater wetland, as found in the literature, is expected to be lower for the proposed facility, since the wetland-to-watershed-area ratio is considerably smaller (0.22%) than the required minimum ratio of 1%. However, other suggested desirable parameter for extended detention wetland systems such as required treatment volume, effective flow path length, and dry weather water balance will be maintained. The structural design of the dams was based on experience and research data. The dams are designed to consist of two zones, shell and core. The core extends as a cutoff trench 4 feet below the ground surface. Additionally, toe drain trenches and anti-seep collars along the pipe where penetrating the dam will be placed to collect and reduce seepage, respectively. Special considerations toward seepage problems were taken into account for both dams by placing a cutoff trench and a toe drain trench. Note: The appendix of this project report contains four AutoCAD files, that can only be viewed using AutoCAD. / Master of Engineering

No description available.

Veränderte Randbedingungen erfordern modifizierte Betriebsregeln. Während die güteorientierte Bewirtschaftung von Stauräumen in der Vergangenheit hauptsächlich bei der langfristigen Bewirtschaftung eine Rolle spielte, gewinnt sie in jüngerer Zeit immer mehr auch bei der kurzfristigen Abflusssteuerung als Vorentlastung und während der Hochwasserereignisse an Bedeutung. Dabei soll vor allem die Entlastung aus Horizonten mit geringerer Wasserqualität ermöglicht werden. Gleichzeitig kann es notwendig werden, im Hochwasserfall insgesamt mehr vorzuentlasten und die Entnahmeeinrichtungen mit einzubeziehen. Der vorliegende Beitrag beschäftigt sich mit den diesbezüglichen Möglichkeiten bei Nutzung vorhandener Entnahmeeinrichtungen und den Anforderungen an bauliche Ergänzungen. Es werden Grundsätze für die Planung, die Berechnung, den Betrieb und die Überwachung sowie Beispiele aus hydraulischer Sicht besprochen.

The heavy rainfall event in August 2002 in Saxony/Germany caused the break of a flood retaining basin in a valley of the Erzgebirge Mountains. The rainfall event with ists hyrologic characteristics and dam break event were analysed and an outflow hydrograph was determing. The propagation of the dam break flood wave in the valleyas of the Briesnitz and Müglitz Rivers has been simulated. Calculated values were compared with some observed data.

Eigentümer und Betreiber von Anlgen mit einem großen Gefahrenpotential sind gehalten, den zuständigen Behörden Auskunft über mögliche Folgen eines Störfalles zu erteilen. Für den unwahrscheinlichen Fall des Bruches eines Absperrrbauwerkes können diesbezügliche Informationen erarbeitet werden.

An earth dam and a dike is one kind of hydraulic construction, which is built with highly compacted earth and can be used for the purpose of containing water in a reservoir to secure the water supply, and in flood control. Earth dam and dike can be a safety issue, as it can experience catastrophic destruction due to the slope failure caused by various factors, such as construction materials, vegetation, atmospheric conditions and so on. The aim of this study is to investigate the influence of the saturation degree (or water content) on the stability of earth dam and dikes under the consideration of precipitation and vegetation with the program PCSiWaPro® (developed at the Technical University of Dresden, Institute of Waste Management and Contaminated Site Treatment). The preliminary tests on a physical model have shown that the security and stability has been already severely compromised in the partially saturated region, i.e. the area above the seepage line was in great danger and it came quickly to landslides on the air side. Before the stability analysis could be done for those unsaturated zones, water flow processes and water saturation in the saturated and partially saturated soil area were simulated using the simulation program PCSiWaPro® under transient boundary conditions. The integration of a weather generator into PCSiWaPro® allows a transient water flow calculation with respect to atmospheric conditions (precipitation, evaporation, daily mean temperature and sunshine duration) and removal of water by plant roots and leaves. Finally, with the Program PCSiWaPro® and Gmsh, a 2D dynamic model of water content distribution in the earth dam could be built, incorporating information of not only climate parameters and vegetation but also geometry, soil properties, geohydraulic conditions and time-dependent boundary conditions. The simulation results of several scenarios both in the laboratory and in the field of China and Germany clearly demonstrated that the accordance between measured values and calculated values for water content using the simulation program PCSiWaPro® was very good. In addition, two kinds of stability analysis models (the Infinite Slope Model and the BISHOP’S Model, one kind of the limit equilibrium method), which were both developed from the old Mohr-Coulomb Model, have been improved with the additional consideration of root reinforcement in the upper layer of the slope and soil water in the earth slope. The Infinite Slope Model has been proved to be mainly applied for the surficial landslide; while the BISHOP’S Model is more responsible for the deeper slip landslide forecasting. Then based on the PCSiWaPro® simulation result of water content in the unsaturated slope in the earth bodies from two study sites, Fs (safety of factor) calculation for those earth slopes was derived providing a sufficient forecasting system for the slope-failure-flood. The results have been compared with the calculated Fs values from the old models (without consideration of the influence of water content change on the slope stability) to study how significantly water content increased the risk of slope landslides.

Climate change is currently one of the most discussed and burdensome global problems. One of its impacts is drought. The drought is already noticeable in the Czech Republic and its effects are supposed to increase. Hradec Králové and Pardubice Regions are also dealing with this danger. One of the possible measures to provide sufficient water for this area in the future is a construction of a new dam. However, the Pěčín dam creates many contradictory reactions. Most criticized is its location. The dam affects not only the first and second zone of the Protected Landscape Area, but also one of the Sites of Community Importance. This thesis summarizes important information about the intended project and its alternatives and evaluates their pros and cons. The thesis is based on qualitative research. The research was conducted with semi-structured interviews with interested specialists from two opinion sites - for and against the intent. The conclusion of this thesis is that there is no need to build a dam or any other alternative in the present, because there is enough water in the examined area. According to the analysis, it is even possible that the predicted future deficit will not even occur. If the deficit occurs after all, it is necessary to proceed with the evaluation of the alternatives and to...