Groundwater management

Xem 1-20 trên 56 kết quả Groundwater management
  • Compared to other ecosystems, wetlands have received an exceptional amount of attention. Wetlands are valuable as sources, sink and transformers of a multitude of chemical, biological and genetic materials. They stabilize water supplies, clean polluted waters, protect shorelines, and recharge groundwater aquifers. They have increasingly become recognized for their unique ecological functions in the environment and are the focus of increased research by scientists and study programs by schools, communities, and nature centers.

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  • About 70% of the world’s population dwells in coastal zones. With the economic and population growth, the shortage in freshwater supply becomes increasingly acute. With surface water more and more depleted and polluted, coastal communities have turned to groundwater to make up for the shortfall. For domestic supply purposes, the percentage of groundwater use has increased to more than 40% on a worldwide basis.

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  • The water problems in Asia’s cities are similar. These include sources and uses of raw water, the large propor-tion of water loss in distribution networks, intermittent supply, and the quality of tap water. In some cities, the excessive use of groundwater resources has caused serious environmental problems, including rapid deple-tion of groundwater, deterioration of water quality, and land subsidence.

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  • The field of groundwater hydrology and the discipline of hydrogeology have attracted a lot of attention during the past few decades. This is mainly because of the increasing need for high quality water, especially groundwater.

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  • In this book, papers pertaining to resource management for sustainable agricultural development are presented in four parts divided into ten chapters. Part I discusses the usage of water and waste management for sustainable agricultural development including aspects like irrigation management to prevent soil and ground water salinization, production of solid fuel from oil palm waste, sustainable ecomaterials and biorefinery from agroindustrial waste, nonpoint pollution from agriculture and livestock activities on surface water....

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  • A decision support system (DSS) will be developed, using the results of the MRB model system and other existing watershed DSSs to enable decision-making about investments in watershed management, aquatic ecosystem restoration, water quality, water quantity, and groundwater management measures in the MRB. The DSS will be explicitly designed to meet sponsor needs. The DSS will be linked to the Basin GIS to enable visualization of the spatial arrangement of management measures.

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  • Groundwater is an important resource that serves as a backbone of human development. In several regions, mostly in developing countries, groundwater from sedimentary and hard rock aquifers used for drinking is naturally contaminated with arsenic. In different countries in Asia such as India, Bangladesh, Cambodia, China, Nepal, Pakistan, Taiwan, Thailand and Vietnam, the situation of arsenic toxicity is alarming and severe health problems are reported amongst the inhabitants relying on groundwater as sources of water for drinking purposes....

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  • Sodium concentration in irrigation water replaces calcium by the process of Base Exchange, therefore reduces soil permeability. Furthermore, excess salinity in groundwater used for irrigation decreased plants osmotic activity and interfere water absorption and nutrients from the soil. Nearly 5% of groundwater from the study site exceeds the desirable limit (1000 mg L-1) of chloride. The natural source of chloride is due to the weathering of phosphate mineral apatite present in granites.

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  • Hydrology is the science that deals with the processes governing the depletion and replenishment of water resources of the earth's land areas. The purpose of this book is to put together recent developments on hydrology and water resources engineering. First section covers surface water modeling and second section deals with groundwater modeling. The aim of this book is to focus attention on the management of surface water and groundwater resources.

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  • If better management (BMP) was adopted in Vietnam there is evidence that the current trends and past environmental degradation can be stopped and even reversed, and shrimp production efficiency can be increased.

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  • The charge to this committee—to envision the future of geotechnology— is at once a grand challenge and a problem. In many ways, geotechnology is a mature field having come to its majority in the last 50 years. Many serious problems have been solved. We know how to build strong foundations, safe dams, and stable roads and tunnels. We have a good understanding about the behavior and protection of groundwater, how to extract the petroleum resources, and develop a geothermal field.

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  • Vùng đất than bùn Minerotrophic bồn tự nhiên đối với asen (As) trong groundwaters: chúng loại bỏ Kể từ vùng nước đầu vào như họ tích lũy Như trong than bùn. Trong Gola di Lago (GdL), Canton Ticino, Thụy Sĩ, nồng độ trong than bùn rất cao (khoảng 150x) so với giá trị "nền". Nước suối vào đất than bùn này chứa lên đến 400 g / L Như, nhưng vùng biển rời khỏi đất than bùn chứa ít hơn 2 g / L

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  • There is an estimated 1.4 billion km3 of water in the world but only approximately three percent (39 million km³) of it is available as fresh water. Moreover, most of this fresh water is found as ice in the arctic regions, deep groundwater or atmospheric water. Since water is the source of life and essential for all life on the planet, the use of this resource is a highly important issue. 'Water management' is the general term used to describe all the activities that manage the optimum use of the world’s water resources....

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  • Sinh thạch tín (As) đã được phát hiện ở groundwaters trong đồng bằng phù sa Terai (TAP) ở miền nam Nepal trong năm 1999. Đến cuối tháng 3 năm 2004, khoảng 245.000 giếng nước đã được thử nghiệm Như, trong đó mẫu khoảng 3% được tìm thấy đã vượt quá tiêu chuẩn tạm thời Nepal 50 g / L. Từ nghiên cứu chi tiết thực hiện tại điểm nóng huyện Nawalparasi,

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  • Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ISBN 04 1536 700 X Implementation of safe drinking water supplies in Bangladesh C.F. Rammelt & J. Boes Faculty of Technology, Policy and Management, Delft University of Technology, Delft, Netherlands ABSTRACT: The normal focal point with the introduction of ‘new’ technologies is the technique itself despite numerous experiences that show that most problems evolve around its implementation process.

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  • Groundwaters trong các tầng ngậm nước phù sa Holocene ở Mỹ có chứa cao asen hòa tan (As) có đặc điểm tương tự như địa hóa học, vi sinh học. Chúng bao gồm: (1) gần như trung tính pH và vừa phải giảm trạng thái oxi hóa khử (2) đáng kể sắt hòa tan và mangan; (3) sự hiện diện của cả hai vi khuẩn sắt và sulfat giảm; và (4) bằng chứng kết tủa của cacbonat authigenic và sulfide giới hạn kim loại (loid) hòa tan....

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  • Theo quan điểm của tần số xảy ra groundwaters có nội dung asen cao ở nhiều nước, trong đó có một số các nước đang phát triển nghèo nhất, sự phát triển của một hệ thống rẻ tiền và hiệu quả để loại bỏ arsenate từ nước uống là điều cần thiết. Điều trị trong nước và nước thải với phế liệu rắn công nghiệp để loại bỏ adsorptive asen cung cấp một cách tiếp cận có khả năng costeffective và bền vững...

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  • These allow products and components to be checked for flaws; assess fit and assembly; study ergonomics; and to analyze static and dynamic characteristics of systems such as stresses, temperatures, electromagnetic emissions, electrical currents and voltages, digital logic levels, fluid flows, and kinematics. Access and distribution of all this information is generally organized with the use of Product Data Management software.[22]

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  • The Environment Agency is the lead organisation for providing flood and coastal risk management and warnings of flooding from main rivers and on the coast. We are responsible for the strategic overview for all sources of flooding. This means we will advise and bring together the planning and management of flood risk from rivers, the sea, groundwater, reservoirs and surface water. Many different public and private bodies are involved in managing flood and coastal erosion risk, each accountable for different aspects of risk management.

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  • Hàm lượng asen trong nước ngầm ở tầng ngậm nước nông và sâu ở Tây Bengal đang gây ra mối quan tâm. Tình hình ở Tây Bengal xuất hiện để được tương tự được báo cáo ở Bangladesh, nơi hàm lượng asen cao trong tầng nước ngầm nông là có liên quan đến thực hành thủy lợi. Xem xét một thực tế là các vùng gốc rễ trong các lĩnh vực lúa giàu asen, nó có khả năng là thực hành thủy lợi có thể thiết lập một chuỗi liên tục giữa asen cao và nước ngầm hàm lượng asen...

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