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Presence of uranium in carbonated petroleum reservoirs has been linked to areas of good permeability, due to the existence of open fractures through which uranium-rich salt waters have circulated. Moreover, uranium is related to organic matter in reducing environments. This paper aims to shed light on nature of uranium in carbonated reservoirs that appear in Cuban gascontrolled formations. For this purpose, wells containing these reservoirs possessing geophysical well logs with electrical images of well wall, natural radioactivity of samples measured in low bottom chamber and total organic carbon content by interpretation of well logs were selected in the North Cuban Petroleum Gas Province. There is evidence that the presence of uranium cannot be considered a direct index of permeability when it appears associated with open fractures as well as closed. It was also showed its association with organic matter in areas where there is no fracturing; hence, in the resulting model, the presence of uranium cannot be considered as index of fracturing and permeability in Cuban carbonates. Integrating data from conventional geophysical well logs, the FMI well wall-imaging tool alongside laboratory work, forms the key to defining the nature of uranium in carbonates. [ABSTRACT FROM AUTHOR]

Copyright of Gestión y Ambiente is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista de Medicina Veterinaria is the property of Revista de Medicina Veterinaria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Técnica Energía is the property of Centro Nacional de Control de Energia CENACE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In Cuba, the current methodologies determine the design head and flow for run-of-river and runof- reservoir hydropower projects using statistical parameters, without any optimization process. This paper describes a software developed by the Empresa de Hidroenergía. This tool takes into account the hydrological data of the site and its specific financial premises, then obtaining the design flow and head, which maximize either the electricity generation or the Net Present Value (NPV). The optimization problem is solved by iterations and graphs or by applying the Generalized Reduced Gradient method (GRG). [ABSTRACT FROM AUTHOR]

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The preliminary design head for run-of reservoir hydropower projects in Cuba is determined as the time-weighted average of net head obtained through reservoir simulation. This paper proposes three alternative methods for obtaining the optimal preliminary design head as follows: 1- by the frequency histogram of the net head, 2- by the net head duration curve and 3- by the generalized reduced gradient method (non-linear programming). Any of these three methods offers a better approximation to this parameter. [ABSTRACT FROM AUTHOR]

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Desafíos is the property of Colegio Mayor de Nuestra Senora del Rosario and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The purpose of this paper was to make a contribution to environmental arrangement of the livestock potential in the municipality of Jimaguayú, Camagüey, Cuba. The indicators, restrictions, categories and conflicts of livestock potential in the region were identified and located on a map. Additionally, the policies, guidelines, regulations, and standards for proper environmental management in each livestock raising area were determined. The study concluded that the potential of livestock raising depends on the environmental use recommended as principal in eight of the seventeen secondary environmental areas that make up the region; one of them was considered for secondary use. In terms of categories, the municipality comprises 126.9 km2 with inexistent livestock potential, including several settlements and water reservoirs; 115.7 km2 showed a poor potential; 316.3 km2 had a mid-potential; and 225.4 km2 was high. The previous contributed to proper environmental arrangement of livestock potential in the municipality of Jimaguayú, Camagüey. In accordance with it, restrictions, indicators, categories and conflicts observed in the sector were determined to make recommendations for development in the secondary environmental areas with some potential. This study was also useful to set up policies, as well as general and specific guidelines. [ABSTRACT FROM AUTHOR]

The common practice to assess the flooding risk downstream of a dam is to obtain design floods for different return periods and simulate their transit through the reservoir according to the operation rules of the spillway, assuming that those floods occur when the level in the reservoir is in the normal water level (NWL). This paper presents a methodology for assessing the flooding risk downstream of a dam considering that the level in the reservoir when the design flood is presented, is a random variable that depends on the long-term operation policy of the dam. For the application of the proposed methodology El Cuchillo Dam is used, located in Nuevo Leon state in Mexico, the methods used for estimating floods associated to different return periods and for defining the long-term operation policy of the dam are presented first; therefore, simulating the dam operation based in that policy, the probabilities associated with the reservoir level during flood period are deducted. When simulating flood routing associated to each return period, conditional probabilities associated with the maximum discharge flow are obtained, and finally the flooding risk downstream of the dam can be estimated. [ABSTRACT FROM AUTHOR]

The paper presents the first stage of an investigation into the use of artificial lakes as urban water infrastructure pondering the landscape. Sprawl problems of Mexican cities respond, first to the market needs and omit the process of sustainability should be scrupulously observed. This research focuses on the fate of stormwater runoff in urban areas as use them to their advantage. Through the document analysis and work synthesis expose the theoretical and methodological foundations to structure the research and raises indicators that assess the theory in a specific instance, as a second stage of the research, to provide clues and perspectives with possibilities to be applied on similar cases. [ABSTRACT FROM AUTHOR]

As a result of INRH policy, related to evaluation, design and construction of infrastructure for water resources exploitation, a diversified development plan was elaborated. As a complement of the plan the joint use of waters is considered, consisting in the use of ground water for supplying population located in this area, distributed through water networks, and the capacity created on reservoirs being used for irrigation purposes. Nevertheless, during severe droughts, ground water is also used for irrigation among other uses. All these actions have contributed to diminish overexploitation of the South Aquifer, which provoked marine intrusion with damages to important sectors of it. Besides, they stopped the soil salinization process and provide good quality water for any purpose. This paper describes experiences of the authors on the subject. [ABSTRACT FROM AUTHOR]

This paper analyzes and summarizes the contributions submitted to "Question 92. Environmental friendly techniques for dams and reservoirs", which took place during the XXIV International Congress on Large Dams, held last June in Kyoto, Japan. [ABSTRACT FROM AUTHOR]

Hydrologic studies in Coro river's basin haven't taken into account spillway's overflow neither reservoir dam "El Isiro" collapse. This reservoir, located at Coro river's basin, serves as a source for supplying drinking water to Coro city in Venezuela. Downstream of this dam is the river's floodplain, which has been under an urbanization process. Also currently, there is a developing agricultural project to exploit plain's advantages in that sense. Therefore, this work is held to incorporate the sub-basin that drains into the reservoir "El Isiro" and to take into account the possibility of dam breaking by using software HEC-HMS and HEC-GEOHMS, which allow the use of Geographic Information Systems (GIS) to optimize the formulation of the basin's conceptual model. According to the results, a high impact in residential and agricultural areas (in terms of peak flows and runoff volumes) by considering reservoir dam "El Isiro" breaking can be appreciated. This paper represents a valuable contribution to flood risk management in the study area. [ABSTRACT FROM AUTHOR]

"Lázaro Cárdenas" and "Francisco Zarco" water reservoirs are located in central- northern Mexico. In order to improve water balance, transit time and Doppler effect ultrasonic level gauges were placed in both reservoir outlets and in the river interconnecting them. In the first dam outlet two ultrasonic transit time sensors were placed in each of its three tunnels. In the "Nazas" river, communicating dams, two ultrasonic level gauges were settled, both with redundant gauges of level and discharge. In "Francisco Zarco" dam outlet a Doppler current meter was set as well as, in the river bottom, a redundant gauge of level and discharge. This paper describes the selection of each type of gauge, the basics of its technology and how they should be placed and operated. A favourable impact has been achieved in the improvement of water management in the zone. [ABSTRACT FROM AUTHOR]

Copyright of Ingeniería Hidráulica en México is the property of Instituto Mexicano de Tecnologia del Agua (IMTA) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Cuadernos de Investigación Geográfica is the property of Universidad de la Rioja, Servicio de Publicaciones and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The diatom flora of Paso de las Piedras reservoir and affluents, Buenos Aires Province, was studied. In this paper we present those species and varieties that belong to the families Diatomaceae, Achnathaceae and Eunotiaceae. Each taxon, studied with light and/or scanning electron microscope, is described and ilustrated. The taxonomic information is completed with references about geographic distribution and ecological requirements. Diatoma moniliforme Kützing, a new record for Argentina and South America is included. A brief characterization of the study area and methodology are also given. [ABSTRACT FROM AUTHOR]

Copyright of Geominas is the property of FUNDA-GEOMINAS. (Fundacion de Egresados d Amigos de la Escuela de Ingenieria Geologica y de Minas) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)