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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4. Ultimate Water Demand <br /> <br />The amount of water required for ultimate development in the District is <br />determined by multiplying the projected total units by the per capita <br /> <br />per unit usage. With an expected decrease in future consumption caused by <br /> <br /> <br />reduced line bleeding and the water conservation program, the ultimate <br /> <br /> <br />water use requirements (Table 11-6) should be considered as the ultimate <br /> <br />maximum. These values are adjusted as needed to provide input to various <br /> <br />aspects of water facility planning and design. The planning and design <br />considerations flow characteristics listed below are significant for the <br /> <br />fo 11 owi ng: <br /> <br />Annual Maximum Day Flow: For slzlng supply & treatment facilities, <br />and booster Stations. <br /> <br />Peak Hour Flow: <br /> <br />For sizing distribution lines and storage <br />facilities. (Fire flows, discussed in Sec- <br />tion V, are also used for these purposes.) <br /> <br />In most water utilities, the ultimate annual maximum day flow will occur <br /> <br />in the summer. This concept is reversed for the 8lue River Water District <br /> <br />with the peak demands ocr:urring during the winter when "pillow counts" are <br /> <br />at their peak. This Winter peak demand has bearing on the planning criteria <br /> <br /> <br />as long as the actual peak time can be established. A real benefit is re- <br /> <br /> <br />ceived from the higher Winter demands thru the alleviation of freezing <br /> <br />problems in water mains and water storage reservoirs. <br /> <br />Treatment works are sized to produce sufficient water to meet the demands <br /> <br />during the maximum demand day of the year, with the tank storage providing <br /> <br />water capacity for the peak hour demands during the day. <br /> <br />11-11 <br />