Figures for water resources per inhabitant are as in 2000 the total water resources in the world are estimated in the order of 43 750 km 3 /year, distributed throughout the world according to the patchwork of climates and physiographic structures at the continental level, america has the largest share of the world’s total freshwater resources with 45 percent, followed by asia with 28 percent, europe with 155 percent and africa with 9 percent. According to estimates of meigs (1953) and petrov (1973) the total area of the world's deserts is 48,350,000 km2, of which 5,850,000 km2are ex- tremely arid, 21,500,000 km2 arid and 21,000,000 km2 semi-arid.
Perspectives on water and climate change adaptation the consortium has performed an interim analysis of all perspective documents and has synthesized the initial results in a working paper – presenting an introduction to and summaries of the perspective world – certainly beyond the arid regions where the problem is most common. Three arid zones can be delineated by this index: namely, hyper-arid, arid and semi-arid of the total land area of the world, the hyper-arid zone covers 42 percent, the arid zone 146 percent, and the semiarid zone 122 percent therefore, almost one-third of the total area of the world is arid land. This paper presents the results of the collation and analysis of annual maximum flood series from some 162 basins in different semi-arid and arid regions of the world from 12 countries in five continents 3637 station-years of data have been analysed.
Arid areas, which are found on almost every continent, account for 40% of the earth’s land surface and supply food to more than 38% of the world’s population  arid areas are common throughout. Ment in arid and semi-arid countries a recent ipcc report (ipcc, 2008) predicts that climate change over the next century will affect rainfall patterns, river flows and sea levels all over the world for many parts of the arid regions there is an expected precipitation decrease over the next century of 20% or more. In arid areas, such a long time-span tends to overestimate evaporation, thus reducing the estimate of water resources it is difficult to assess the reliability of the model’s results for the semi-arid and arid countries (eg egypt, djibouti, eritrea, morocco and namibia. Three arid zones can be delineated by this index: namely, hyper-arid, arid and semi-arid of the total land area of the world, the hyper-arid zone covers 42 percent, the arid zone 146 percent, and the semiarid zone 122 percent.
The drylands of semi-arid and arid areas of subtropical regions contribute significantly to the world's food production, particularly of coarse grains, cereals, pulses, and oilseed although present yields of these crops are low, they have excellent production potential in dryland conditions. If the barelands belong to arid regions or mountainous areas, the total area f of from-glc composed of barelands and grasslands is seen to correspond to the area e derived from the relation arid regions (282%) – areas in category i ( 08%) + high land areas above 3 km between latitudes 55° s to 55° n (27%.
Vision 2030 development strategy for northern kenya and other arid lands final august 2011 1 for assistance with policy analysis, technical advice and workshop facilitation rainfall in arid areas ranges between 150mm and 550mm per year, and in semi-arid between 550mm and 850mm per year. On the nature of climatic factors and their analysis in the semi-arid delhi region in relation to water management in proceedings of the international seminar on water management in arid and semi-arid regions. Arid regions of the world were classified into four categories, namely a, severe deserts, where both aridity and vegetation indices are very small g, semi-arid regions, where the vegetation index is proportionally related to the ai i, irrigated areas and oases, where the vegetation is relatively abundant despite severe dryness and s, soil degradation areas, where the vegetation is poor despite relatively humid conditions.
Dry-land horticulture has immense potential in providing nutrition, social security and eco-restoration for the inhabitants of desert or rainfed and tribal land-areas of hot arid and semi-arid. However, many areas of arid climate receive far less than that some deserts around the world don't receive 10 inches of rain in 10 years the atacama desert in chile is known as the driest place on earth.
Abstract the drylands of semi-arid and arid areas of subtropical regions contribute significantly to the world's food production, particularly of coarse grains, cereals, pulses, and oilseed. Within the arid and semi-arid regions at the invita-tion of the topic coordinator of the 5th world water forum, the arab water council (awc) accepted to lead the preparation process of this perspective document in consultation with regional stake-holders figure 1: arid regions will suffer the maximum precipitation decrees worldwide.