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<br />,- 6 - <br /> <br />officials involved cOllecting the data necessary to detennine the scope of <br /> <br />the ground water problem. The sources of infonnatiofl used are presented <br /> <br />in the following paragraphs. <br /> <br />USGS Well Study <br />The USGS has had a well monitoring program along the South platte <br />River since 1947. The early data collected by this pro\)ram was presented <br /> <br />in the Geologic Survey Water Supply Paper 1:378 in 1957. The well records <br /> <br />in the vicinity of the Town of ClrOok have different: length of record varying <br /> <br /> <br />from the longest, 1949 through 1979, to the shortest, 1971 through 1975. <br /> <br /> <br />Graphs of the wells that have blsen monitored in the immediate vicinity <br /> <br /> <br />of Crook are shown on Figures 5,6,7, and 8. A compclrison of the ground <br /> <br />water levels in 1949 compared to the. 1975 levels are presented in Figure 9. <br /> <br />j'IIkalinity <br />Alkalinity is an indication of evaporation of the water on the surface. <br /> <br />From an analysis of aerial photographs taken October 5, 1937 and March 19, <br /> <br /> <br />1980, Figures 10 and 11, it is evident: that alkalinity problems have existed <br /> <br /> <br />in the immediate vicinity of Crook since at least as early as 1937 which pre- <br /> <br /> <br />,dates development of the wildlifl9 area. The photographs also confinn the <br /> <br />existence of ponding or swampy areas in the Crook area since 1937. These <br /> <br />swamps, ponds, and alkalinity s:reas are the result of htgh ground water or <br /> <br />changes in soil type and permeability. <br /> <br />FLOODING <br /> <br />The evaluation of the flood pro)Jlems and possible causes as mentioned <br /> <br />by local officials involved the studies described in the following paragraphs. <br />