"This Comprehensive Assessment of Water Management in Agriculture, involving more than 700 leading specialists, evaluates current thinking on water and its interplay with agriculture to help chart the way forward. It offers actions for water management and water policy - to ensure more equitable and effective use. This assessment describes key water-food-environment trends that influence our lives today and uses scenarios to explore the consequences of a range of potential investments. It aims to inform investors and policymakers about water and food choices in light of such crucial influences as poverty, ecosystems, governance, and productivity."--Jacket.

This article discusses the basic ways of water-preparation in food industry. Water-preparation plan with elements of disinfecting for production of drinking water and drinks is given. The analysis shows that water should meet definite microbiological requirements. In order to reduce its fatal influence on the health of people the clearing and preparation of water are necessary. Development of techniques and means of clearing without chemical technologies, including ozone treatment technologies, allows one to lower and to get rid of application of chemical compounds and reagents. At the moment the ozone treatment water technologies with consequent treatment on filling filters are the most rational. Ozone is the strong oxidant and disinfects water faster than chlorine in some times. With activated carbon use both the flavouring qualities and smell become better. Technology of mutual ozone processing with absorption is the most perspective for water purification and disinfection, possessives a high efficiency in comparison with attitude to pathogen microorganisms, does not lead to the formation of harmful collateral products. Therefore, the questions of development of safe technologies and means for water preparation and treatment are actual and well timed

Molden, David; de Fraiture, Charlotte; Rijsberman, Frank., 'Water scarcity: The food factor', Issues in Science and Technology, pp.39-48, 2007

This Water Policy Briefing is based on the CA Research Report 4: Does International Cereal Trade Save Water? The Impact of Virtual Water Trade on Global Water Use (CA Research Report 4) by Charlotte de Fraiture, Ximing Cai, Upali Amarasinghe, Mark Rosegrant and David Molden; and on Investing in Water for Food, Ecosystems and Livelihoods (BLUE PAPER, Stockholm 2004, Discussion Draft) by David Molden and Charlotte de Fraiture; and on Is Virtual Water Trade a Solution for Water Scarce Countries? by Charlotte de Fraiture and David Molden, Bridges 2004. By the year 2050 there will be an additional 3 billion people to feed. Food production may need to increase by 70-90 percent from levels in 2000 to meet this global food demand. Without improvements in the efficiency and productivity of agricultural water use, crop water consumption would have to grow by the same order of magnitude. A big challenge in water management is to grow sufficient food for a growing and more affluent population while meeting the many other demands on limited water resources—household needs, industrial requirements and environmental functions. Already, an estimated 20% of the global population lives in river basins that are characterized by physical water scarcity. International food trade can have significant impacts on national water demand. The term ‘virtual water’, first introduced by Allan (1998), refers to the volume of water used to produce traded crops. By importing food a country ‘saves’ the amount of water it would have required to produce it on its own soil. Thus, international food trade can have important mpacts on how and where water is used. Food trade reduces water use at two levels. At a national level, a country reduces water use by importing food rather than producing it. At a global level, trade reduces water use because, at present, production in exporting countries is more water efficient than in importing countries. Moreover, four of the five major grain exporters produce under highly productive rainfed conditions while importing countries would have relied more on irrigation. In fact, without cereal trade, global irrigation water demand would have been higher by 11%. Some researchers have suggested that international food trade can and should be used as an active policy instrument to mitigate local and regional water scarcity. They contend that, instead of striving for food self-sufficiency, water short countries should import food from water abundant countries. Indeed, food trade has a large potential to alleviate water scarcity, but in practice there are many reasons why this is unlikely to happen in the near future.

"[This] is the first complete guide to growing and using edible wetland plants worldwide. Practical and easy-to-use, this book will appeal to a wide spectrum of readers, from water gardeners and commercial growers, botanists and plant historians, to students of aquaculture and horticulture. ..."--Back cover.