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<br />.. <br /> <br />COO"~" <br />100 <br /> <br />. <br /> <br />when the net output is compared to the net input for the basin, the cal- <br /> <br />culated efficiency is quite different from that for an individual use by <br /> <br /> <br />itself . <br /> <br />SINGLE USE <br /> <br />5EQuEIJrlAL USE <br />C basin) <br /> <br />~40 <br />TW.-1-O <br /> <br />r,,-eo q 0..40 <br />Wo'40 <br /> <br /> <br />. <br /> <br />EHiciCJ\~' t. . ~ - 507. <br /> <br />f"" C!.tO.tO.,o 81-r. <br />:nla~F1C&j :- 1 . 00. ...,. <br />- <br /> <br />While aggregated systems are much more complex than indicated in the <br /> <br /> <br />diagram, such sequential uses are the common pattern in western river <br /> <br />basins. The South Platte Basin is often described as the most complex <br /> <br /> <br />sequential or reuse system in the entire western region. The important <br /> <br /> <br />point to recognize is that an efficiency measurement is associated with a <br /> <br /> <br />very specific boundary. Its implications must be viewed likewise in terms <br /> <br /> <br />of the same boundary, High efficiency may be very meaningful to the single <br /> <br /> <br />user in terms of volumes of water to be handled because of associated costs <br /> <br /> <br />(treatment, delivery), while from the viewpoint of the entire basin it <br /> <br /> <br />may be insignificant, <br /> <br />. <br /> <br />In discussing water uses, it should be emphasized that all uses are <br /> <br /> <br />not consumptive. Legitimate and beneficial uses range from "contact" and <br /> <br /> <br />"in-stream" uses (boating, swimming, fishing); to withdrawals which do <br /> <br /> <br />not consume (hydro-power); to withdrawals which consume (irrigation, muni- <br /> <br />cipal, industrial), The efficiency criteria can not be applied with the <br /> <br /> <br />same meaning to all these different uses. <br /> <br />ii <br />