ore depositsWhen mineral grains of different density are moved by flowing water, the less dense grains will be most rapidly moved, and a separation of high-density and low-density grains can be effected. Mineral deposits formed as a result of gravity separation based on density are called placer deposits.
water supply systemsThe total land area that contributes surface runoff to a river or lake is called a watershed, drainage basin, or catchment area. The volume of water available for municipal supply depends mostly on the amount of rainfall. It also depends on the size of the watershed, the slope of the ground, the type of soil and vegetation, and the type of land use.Clarification and disinfection are the conventional processes for purifying surface water supplies. Other techniques may be used in addition, or separately, to remove certain impurities, depending on the quality of the raw water.
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