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<br />6 ( INTRODUCTION <br /> <br />WATER USE <br /> <br />Water use in this report is subdivided into offstream use, instream use, and <br />wastewater release. The difference among these types of use is explained below. <br />Offstream use is a water use that depends on water being diverted or with- <br />drawn from a surface- or ground-water source and conveyed to the place of use. <br />To determine the total quantity of water used (self-supplied withdrawals and pub- <br />lic-supply deliveries), five subtypes of use are evaluated, as explained below and <br />shown in the following sketch. <br /> <br />1. Withdrawal-The quantity of water diverted or withdrawn from surface- <br />or ground-water (A in sketch). <br />2. Delivery(release- The quantity of wa1er delivered at the point of use (B) <br />and the quantity released after use (C). <br />3. Conveyance loss-The quantity of water that is lost in transit, for example, <br />from point of withdrawal to point of delivery (A-B), or from point of <br />release to point of return (C-D), <br />4. Consumptive use-That part of water withdrawn that is evaporated, tran- <br />spired, or incorporated into products or crops. In some instances, <br />consumptive use will be the difference between the volume of water <br />delivered and the volume released (B-C). <br />5. Return flow-The quantity of water that is discharged to a surface- or <br />ground-water source (D) after release from the point of use and thus <br />becomes available for further use. <br /> <br />Ground = A <br />water <br /> <br />= <br /> <br />~ <br /> <br />B Wastewater <br />treatment <br /> <br />Ground a A <br />water <br /> <br />B <br /> <br />c <br /> <br /> <br />c <br /> <br /> <br />D <br /> <br />= <br /> <br />~ <br /> <br />B <br /> <br />Water <br />user <br /> <br />B <br /> <br />~ <br /> <br /> <br />c <br /> <br />~ <br /> <br />B <br /> <br />A <br /> <br />! <br /> <br /> <br />v <br /> <br />Public <br />supplier <br /> <br />B <br /> <br />c <br /> <br /> <br />~ <br /> <br />Surface water ~ <br /> <br />- <br /> <br />EXPLANATION <br /> <br />A Withdrawal <br />B Delivery <br />C Release <br />D Retu rn flow <br /> <br />--.-..,.",.,.. <br /> <br />."<..~ <br />