With a few exceptions, in the developed world these solutions are often inefficient and many of them are neither economically viable nor environmentally sustainable. Water losses through evaporation from conventional water storage devices are also significant. The amount of water lost through evaporation from water reservoirs is higher than the total amount of water consumed in industrial and domestic uses (Shiklomanov, 19991. By 1995, as a result of efficiency gains in water supply and demand management, total world water withdrawal was only about half what planners had predicted thirty years earlier based on historical trends iGleick, 1998).