Spara som favorit. Skickas inom vardagar. As the largest public water sector performance database IBNET provides comparative information on utilities' cost and performance indicators.
Building off its inaugural report, the IBNET Blue Book highlights trends and monitors the effects of recent crises to help water utilities and governments improve services for all, including the poor. The utilities represented in the database employ about , professional staff. IBNET also continues to support national and regional water associations.
Nearly 1 billion people lack access to safe water and 2. Water and sanitation utilities could expand their services to reach these people but broken pipes, poor management, and inability to cover costs or collect customer payments often prevent service from improving and expanding. IBNET seeks to expand access to comparative data among utilities globally, helping to promote best practice among these service providers and eventually providing consumers with access to high quality and affordable water supply and sanitation services.
ReliefWeb has been the leading online source for reliable and timely humanitarian information on global crises and disasters since Learn more about ReliefWeb. As an outcome of the World Humanitarian Summit, the Grand Bargain aims at improving the efficiency of humanitarian action. Urban water pricing cost recovery, affordability and water conservation : Policymakers increasingly consider pricing as an important tool for cost recovery, affordability and water conservation to address water scarcity issues. However, implementing tariff reforms is often difficult in practice due to political factors and the absence of governance structures that can result in quality service provision.
Additionally, institutional replication of successful water pricing policies has been difficult due to incomplete information and the contextual uniqueness of local institutions, politics and social relations. Water service provision thinking has to be based on long-term horizons. Infrastructure development takes time beyond the life of most governments. In those countries without such political continuity, there is a need for all political factions to agree on goals, policies and plans.
It is unlikely that water can ever be separated from politics, but city political consensus must be attempted [ 53 ]. Climate change : Climate change is affecting the frequency of extreme weather events and hence increasing the uncertainty about water availability and reliability [ 50 ]. A properly planned, developed and managed infrastructure and related institutional capacities are required in order to buffer seasonal climatic variations and address water demand issues. More emphasis should be given to mountain-specific issues.
Major priority areas include water governance for transboundary basins, cross-border information systems, establishing a knowledge base for mountain regions and sharing benefit between mountain and downstream communities [ 42 ]. Knowledge gaps: With respect to present and future, hydrology poses a serious constraint for infrastructure development. Changing hydrology will pose special challenges to the design, planning and management of infrastructure [ 42 ].
Land use influences raw surface water quality and treatment costs for drinking water supply [ 51 ]. Anthropogenic disturbances to the environment can compromise valuable ecosystem services, including the provision of potable water. These disturbances decrease water quality, potentially increasing treatment costs for producing drinking water. Efficiency and reliability of a water supply system: Water inflow is among primary determinants of the successful functioning of the entire water supply system since it influences water storage. Developing an approach to assess the resilience of WSS under limited rainfall provides useful insights into effective system management [ 26 ].
It can also help to understand and identify the sensitivity of the WSS to a changing rainfall amount and distribution pattern. Challenges for water supply and Governance: Cities struggling to keep pace with population and demographic changes are not unique.
Their main challenges related to topography, old infrastructure the nineteenth century , population growth and development needs, water charges, climate change and water supply history. Water is most fundamental in shaping the land and regulating the climate. It is one of the most important resources that profoundly influence life.
The IBNET Water Supply and Sanitation Blue Book 2014
Water quality is the most fundamental controlling factor when it comes to health and the state of diseases in both humans and animals. As a principle, drinking water is supposed to be free from harmful pathogens and toxic chemicals [ 3 ]. Contamination of freshwater especially groundwater sources is one of the main challenges currently faced by the South Africans, more especially in communities who depend almost exclusively on groundwater [ 52 ].
Groundwater is used for domestic, industrial and agricultural water supply in all four corners of the world. Therefore, the presence of contaminants in natural freshwater continues to be one of the most important environmental issues in many areas of the world, more especially in developing countries [ 53 ]. Once the groundwater is contaminated, its quality cannot be restored back easily, the best way is to protect it. The concept and theory of water quality is very broad since it is influenced by many factors.
Water quality is based on the intended uses of water for different purposes, that is, different water uses require different criteria to be satisfied. In water quality analysis, all of the accepted and unaccepted values must be clearly defined for each quality variable.
If the quality variables meet the pre-established standards for a given use is considered safe for that use. When water fails to meet these standards, it must be treated if possible before use. Physical quality parameters are related to total solids content, which is composed of floating matter, settleable matter, colloidal matter and matter in solution.
The IBNET Water Supply and Sanitation Performance Blue Book
The following physical parameters are determined in water [ 12 ]:. Color : caused by dissolved organic materials from decaying vegetation or landfill leachate. Taste and odor : can be caused by foreign compounds such as organic compounds, inorganic salts or dissolved gases. Temperatures : the most desirable drinking water is consistently cool and does not have temperature fluctuation of more than a few degrees. Groundwater generally meets these criteria. Turbidity : refers to the presence of suspended solid materials in water such as clay, silt, organic material, plankton, and so on.
ISBN 13: 9780821385821
The chemical constituents have more health concerns for drinking water than for the physical constituents. The objectionability of most of the physical parameters are based on esthetic value than health effects. But the main objectionability of some of the chemical constituents is based on esthetic as well as concerns for adverse health effects. Some of the chemical constituents have an ability to cause health problems after prolonged period of time [ 54 ].
That means the chemical constituents have a cumulative effect on humans. The chemical quality parameters of water include alkalinity, biological oxygen demand BOD , chemical oxygen demand COD , dissolved gases, nitrogen compounds, pH, phosphorus and solids organic. Sometimes, chemical characteristics are evidenced by their observed reactions such as in laundering, redox reactions, and so on [ 12 , 54 ].
Arsenic : occurs naturally in some geologic formation. It is mostly used in agricultural chemicals in South Africa. In drinking water, it has been linked to lung and urinary bladder cancer. The amount found can be caused by the leaching of industrial or domestic waters. Fluoride : is a natural contaminant of water. It is one of those chemicals given high priority by WHO [ 14 ] for their health effects on humans. High F in drinking water usually causes dental and skeletal fluorosis.
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Zinc : is found in some natural waters, particularly in areas where zinc ore deposit have been mined. Though it is not considered detrimental to health, but it will impart a bad taste to drinking water.
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