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<br />The area in the rectangle labeled~ represents total volume <br /> <br />pumped; the area under the curve labeled q represents the volume of <br />... <br /> <br />stream depletion. In terms' of volume removed from the stream during <br /> <br />the pumping period, the effect is small, only about 10 percent of <br /> <br />the volume pumped. However, the effect continues, and as time <br /> <br />approaches infinity, the volume of stream depletion approaches the <br /> <br />volume pumped. <br /> <br />Consideration of residual effects such as are illustrated in <br /> <br />Figure 4 lead to the conclusion that effective administration of a <br /> <br />system that uses both surface water and a connected ground-water <br /> <br />reservoir requires a great deal of foresight. The immediate effects <br /> <br />on streamflow of a change in pumping pattern may be very small; <br /> <br />plans adequate for effective administration of the resource generally <br /> <br />require consideration of needs in the future--sometimes the distant <br /> <br /> <br />future. The sample problems solved later in this report illustrate <br /> <br />the need for long-range plans in water administration. <br /> <br />~. <br />~ <br /> <br />16 <br />