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<br />n'.' ..."r <br />'u' , ;,(O,.~ <br />.~ v.....' '~J <br /> <br />,i?~ the basin, consistent with protecting existing rights to the use <br />~1i~"t <br /> <br />of the surface-water supply, <br /> <br />When a new appropriation of the ground water in the basin <br /> <br />is permitted, the effects of the new pumping on the river must <br /> <br />be calculated, Quantities that need to be known or estimated in <br /> <br />order to perform the calculations are the hydraulic coefficients <br /> <br />of the aquifer, transmissivity and storage, location and shapes <br /> <br />of aquifer boundaries, distances of the well from the river and <br /> <br />aquifer boundaries, and the manner of disposal of water not <br /> <br />actually consumed and its amount, With the exception of return <br /> <br />flow, the distance from the pumping well to the stream causes <br /> <br />the greatest variation of any of the parameters in the effect of <br /> <br />~f~~ pumping on the stream at any time, An example may give some <br /> <br />idea of the magnitude of the amount and time that the available <br /> <br />supply is increased by the coordinated management, Given the <br /> <br />aquifer characteristics in the vicinity of Albuquerque, the <br /> <br />effect on river flows of withdrawals ,from a well located three <br /> <br />miles from the river is only about 50% after ten years of <br /> <br />pumping, <br /> <br />Assuming a return flow of 50%, as is typical of <br /> <br />municipal use, no reduction of surface water use would have to <br /> <br />be made for 10 years, <br /> <br />Perhaps a better way to evaluate the effects of coordinated <br /> <br />management is by consideration of these facts, <br /> <br />Before the <br /> <br />declaration of the Rio Grande Underground Water Basin in 1956, <br /> <br />the City of Albuquerque had established the right to withdraw <br /> <br />7 <br />