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<br />. <br /> <br />. <br /> <br />w <br />-4 <br /> <br />. <br /> <br />, , <br /> <br />,~~~ <br />l0~. <br /> <br />Disadvantages of ground-water storage when compared to surface <br /> <br />storage include the need for energy to pump the water out of the ground, <br /> <br />whereas, energy can be produced at some surface storage locations. A <br /> <br />potential problem also exists with chemical pollution in a ground-water <br /> <br />reservoir as a result of surface and sub-surface sources of water- <br /> <br />soluble salts and minerals. Most surface storage reservoirs are located <br /> <br />50 as to avoid basin salt sinks, and are not likely to degrade in quality. <br /> <br />Another problem with artificial recharge systems is the possibility of <br /> <br />waterlogging of adjacent lands where the water levels are near the <br /> <br />surface. <br /> <br />Most important from a water-management view is the contrast in <br /> <br />responsivemess between the ground-water reservoir and the surface <br /> <br />reservoir in terms of meeting critical demands. For delivery purposes, <br /> <br />surface storage is instantaneously available and the delivery rates can <br /> <br />be directly controlled by man. The yield from ground-water storage is <br /> <br />limited by the rate of ground-water transfer within the aquifer, Although <br /> <br />ground-water storage may not be affected by short droughts, wells may be <br /> <br />dried up because the well is too shallow or because local pumping draws <br /> <br />down water levels excessively. <br /> <br />Ground-Water Recharge Case Studies <br /> <br />The concept of artificial recharge for replenishing ground water is <br /> <br />by no means a new idea. Artificial recharge systems have been in <br /> <br />existence for quite some time. <br />