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in mid-March and extends into May, end in the ease of 1993, into the letter pert of June. • <br />Peek flows range from 0.07 to 0.58 cfs. A tabulation of the eeeaonel flow statistics <br />shows the mean flow rate in the spring is 0.056 cfs, while the summer mean flow rate is <br />0.02 cfs. The hydrograph plots (Appendix 7-6) indicate the majority of the annual runoff <br />volume occurs in the spring. Wo runoff volume comper icons can be made with the summer and <br />fell seasons es the Channel was ephemeral end/or the flows from precipitation events were <br />less than the minimum required to activate the recorder. wo continuous date was obtained <br />in 1991 as siltation problems in the flume continually occurred. Some of the date papa in <br />1992 ere owing to siltation or frozen Conditions in the flume. The lack of mean daily <br />flow values in 1993 for the periods instenteneous flow date indicate there was flow is <br />because the fLOw stage was of insufficient magnitude to enter the stilling well access <br />tube. <br />Grassy Creek. Site TSGFS is located on Grassy Creek approximately 1800 feet upstream from <br />the Twenty Mile Highway in Section 16, R87W (see Exhibit 7-1). Both continuous and <br />instantaneous flow date are collected at this site. Continuous flow monitoring was <br />initiated in 4/91 as was instenteneous flow monitoring. gtreamf low in the channel reach <br />at YSGFS is perennial. Data gaps in the mean daily flow tables (see Appendix 7-b) for <br />1991 and 1992 at this site are due to flow stages being less than the minimum height of <br />the intake for the communication tube between the flume end the stilling well. <br />From a review of the flow hydrographs, the period of snowmelt influence appears to start <br />in late March and early April and extends into early to mid-June. The largest mean daily <br />flows occur during this period and range from 2.2 to 5.6 cfs. A tabulation of the <br />seasonal flow statistics shows the 5991 to 1993 mean flow rate in the spring was 0.91 cfs, <br />the mean flow rate in the summer was 0.1 cfs, end the mean flow rate in the fell was 0.06 <br />cfs. Summer and fall rainfall runoff peeks are smell (<0.25 cfs) and of little <br />significance. Xeesured spring flow volumes ere 8 to 18 times as great as summer flow <br />volumes end 41 to 68 times as greet as measured fall flow volumes. <br />Surface Water ouelity. For the water quality discussion, the following items for each <br />sample date at each site should be referred to in Appendix 7.7. The items ere arranged by <br />sample site and include: 1) water quality reports, 2) milliequivalent/liter (meq/l) <br />summaries, 3) percent meq/t summaries, 4) trilineer and Schoeller diagrams, 5) mean <br />seasonal trilineer and Schoeller plots, 6) water quality statistics reports, and 7) <br />seasonal water quality statistics reports. Additionally, Table 7-33 summarizes trilineer <br />diagram and Schoeller plot analysis information for each stream monitoring site. For each <br />100 <br />