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<br />GUO:74 <br /> <br />I. <br />'- <br /> <br />. e ff ic iency . For example, if most of the senior water rights are located <br /> at the lower end of the basin, these rights would be able to call out <br /> the upstream junior rights during periods of shortage, Under such a dis- <br /> <br />. <br /> <br />. <br /> <br />tribution of rights, it would be important that the water use under <br /> <br /> <br />those senior rights be efficient such that the amount of call is no <br /> <br /> <br />greater than necessary and the return flow from the seniors' use is held <br /> <br /> <br />to a minimum. <br /> <br />On the other hand, if the most senior rights tend to be located in <br /> <br /> <br />the upper reaches of the water-use area, the downstream junior rights <br /> <br /> <br />have an opportunity to make reuse of the return flow and accomplish a <br /> <br /> <br />high overall basin efficiency. <br /> <br />Assuming that in any basin water uses can be separated into "bene- <br /> <br /> <br />ficial" andllnonbeneficial," the only opportunities for improving river <br /> <br /> <br />basin water-use efficiency lie in increasing beneficial uses by decreasing <br /> <br />nonbeneficial uses and/or decreasing the outflow at the lower end of the <br /> <br />basin. <br /> <br />-17- <br />