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A. Fish Creek Drainace <br />Three monitoring sites are situated within the Fish Creek drainage: NPDES 004 and SK-52-6 <br />are on the south tributary (also known as Cow Camp Creek) and SW-S2-9 is on the north <br />tributary (also known as Bond Creek). <br />1. NPDES 004 <br />Fluw data are presented on Table 20 and hydrographs based on weekly instantaneous flow <br />measurements are presented in Appendix D. The hydrographs consist of two pages, the first <br />being data for 1986 only, while the second shows historical data from January 1981 to <br />September, 1986. Review of these hydrographs show that peak runoff was less in 1986 than <br />in 1985 even though there was more total precipitation in 1986 (see Tables 1 and 3). This <br />is due to when the precipitation occurred, what type it was, whether the ground was frozen <br />or not, and when the snowpack began to melt. For example, if one looks at the amount of <br />precipitation from December 1984 to March 1985 (7.61 inches) and compares that to the same <br />period in 1985/1986 (6.73 inches), one finds less moisture available in the snowpack for <br />spring runoff. This may also be shown by comps ri nc total acre-foot discharges for the <br />same period. Prior to spring runoff in April of 1985, a total of 68.7 ac-ft of water had <br />discharged through the monitoring flume, while in 1986 for the same period, 107.6 ae-ft <br />- were discharged even though the total discharge in 1986 was less. An unusually warm and <br />early spring in 1986 caused the runoff to occur earlier and be spread over a longer time <br />period, resulting in a small peak discharge. Also, the ground was not frozen in the early <br />part of the winter of 1985/1986 when snow started accumulating. That, together with an <br />increase in the amougt of disturbed acres, ma)• have resulted in the snowpack melt going <br />directly into the ground and not contributing to surface runoff. 7ota1 discharge was 253 <br />ac-ft in 1986, versus 293 ac-ft in 1965. Peak mean daily flow was 3.3 cfs on April 8, <br />7985, while it was 1.5 cfs on February 27, 1986. <br />Review of Table 17 shows that TDS values increased in 1986 from 1985, while it remained a <br />magnesium sulfate type water. No excursions of NPDES effluent limits were observed here <br />in 1986. <br />2. Surface Ylater Site SK'-52-6 <br />This site monitors Cow Camp Creek less than 1/4 mile downstream of the NPDES 004 discharge <br />and an adjacent diversion ditch. Review of the hydrograph of monthly flow readings shows <br />/~ less runoff in 1966 than 7985. Crest stage gauge (CSG) data shows a peak flow of 17 cfs <br />1 in the spring of 198E, compared to a peak flow of 30 cfs in the spring of 198:. <br />42 <br />