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<br />lR2 <br /> 22 <br /> 24 <br /> 26 <br /> 28 <br />" <br />~ <br />= 30 <br />, <br />. <br />" 32 <br />, <br />B <br />~ <br />" 34 <br />. <br />c <br /> 36 <br /> 38 <br /> 40 <br /> 42 I <br /> 1944 1946 <br /> <br />GROUND-WATER TECHNOLOGY <br /> <br />27 <br /> <br /> <br />Defendant's pumpmg <br /> <br /> <br />Water level <br /> <br /> <br />c <br />o <br />I <br /> <br /> 1000 <br /> Yield~ . <br /> 3 <br /> c <br /> 800 E <br /> " <br /> 0 <br /> 600 . <br /> c <br /> g <br /> " <br /> . <br /> = <br /> ,; <br />I I I I I I I I I I I " <br /> 200 ~ <br />1948 1950 1952 1954 1956 1958 1960 <br /> <br /> <br />FIG. 4,- CHANGES IN WA.TEH LEVEL AXD YIELD OF PLAINTIFF'S WELL <br /> <br />the defendant could pump at the capacity necessary for his needs. This agree- <br />ment worked out quite well. as the defendant was able to pump his usual sup- <br />ply for the irrigation season, <br />Table 1 shows the annual pumpage fOr the period from 1953 to 1956 by use. <br />Except for a small volume for domestic use, all the water pumped during 1953 <br />was used for irrigation. Other uses, especially municipal use, gained signifi- <br />cant proportions during the period from 1954 to 1956 and irrigation use be- <br />gan to decline in 1955. <br />Special computations were made as a part of this study to determine the <br />cause of the lowering of the water level in the vicinity of the plaintiff's well, <br />Pumping of all wells in the area was considered to be contributing to the low~ <br />ering of the water level; however, a number of wells were found to have no <br />appreciable effect and were not used in the final computations because: (1) <br />The volume of water pumped was small, (2) the volume pumped in previous <br />years had no adverse effects on the plaintiff's well, or (3) the distance from <br />the plaintiff's well was great. The wells that contributed significantly to the <br />lowering of the plaintiff's well were: (1) His own well: (2) the wells of the city <br />of Colorado Springs; and (3) one new irrigation well that began discharging <br />water in 1954. Computations based on the Theis formula,9 were made to esti- <br />mate the effects that the pumping of the principal wells had on the lowering of <br />the water table at the plaintiff's well during a 15-month period in 1954 and <br />1955. The results compared closely with the measured water levels in the <br />plaintiff's well. as shown in Fig. 5. The analysis was based on the following <br />assumptions. idealizations. and procedures: <br />- - <br />9 "The Relation BC'tween the Lowering or thl' Piezomctl"ic Surface and the> Rate and <br />DUI'alion of Dischaq!;e of a Wdl Using Ground-W;ltcl' .:;tOI'a~c," by C. Y. Theis. Trans- <br />actions, llith ..\nnual .\I('....ling. Aml'l", Gl'Oph~..sical Union. 1';1I1~, 1935, pp. 519-;J~-I. <br />