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Show Chapter 2 Watershed Characteristics and Uses Table 6 Treatment Plant Raw Water Total Coliform Years With Significantly Higher Means Treatment Plant Years with Significantly Higher Means ( based on Student's t test with 95 percent probability) Little Cottonwood Creek 1971 WATERSHED COLIFORM DATA The canyon watershed data has a much shorter period of record ( see Table 5). Years with significantly higher mean annual total coliform are summarized in Table 7. Table 7 Watershed Data Total Coliform Years With Significantly Higher Means WATERSHED Years with Significantly Higher Means ( based on Student's t test with 95 percent probability) Big Cottonwood Creek 1995 and 1996 Little Cottonwood Creek 1995 The watershed coliform data allows a comparison of total to fecal coliform. Mean annual total coliform for Mill, Big Cottonwood, and Little Cottonwood creeks increased in 1995 and 1996, however, fecal coliform did not. Page 22 |