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E. Water Quality <br />An often- overlooked factor in water storage is the importance of impounding water at high <br />altitude. At Lower Elevations, water is held at higher temperatures which promotes algae growth <br />and higher sedimentation -- two of the many items that makes raw water treatment difficult and <br />expensive. The third factor is pH, and while not as crucial as the two foregoing, it must be <br />adjusted as part of water treatment. <br />Water held at higher elevations can be delivered to treatment facilities in near - pristine condition <br />which reduces treatment, the need for settling of sediment and adjustments for salts (such as <br />selenium) which the stream acquires along the water course. <br />E <br />