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fell raf of all runoff peeks et Stte T552 are very small (typically <0.5 cfs) end of little • <br />signif icence. Measured spring flow volumes are 10 to 24 times es greet es summer flow <br />volumes. <br />Site YSSF3 is located approximately 11,430 feet downstream from Site YSSF3 in Section 10, <br />R88Y (see Exhibit 7-1). Both continuous and instantaneous flow data are collected et this <br />site. Continuous slow monitoring was initiet ed in 4/91 end instenteneous flow data was <br />initially collected in 9{90. The channel reach at Site YSSF3 behaves principally as e <br />perennial channel. There has been one documented zero flow measurement in 9/90 which is <br />consistent with the same date zero flows measured et upstream Sites YSS2 and YSSF3 on Sege <br />Creek. <br />From a review of the flow hydrograph s, the period of snowmeLt influence appears to start <br />in late March and early April end lasts into May end early June (early July in 1993). The <br />largest peak flows occur in the spring during the snowmelt influenced runoff period and <br />range from 2.1 to 10 cfs. ~ tabulation of the seasonal flow statistics shows mean flow <br />rates in the spring are 1.5 cfs, while summer and fall mean flows ere 0.09 cfs and 0.04 <br />cfs, respectively. Summer end fall rainfall runoff peaks are small (0.08 to 0.6 cfs) and • <br />of little significance. Measured spring flow volumes ere 16 to 68 times es great as <br />summer flow volumes end 35 to 53 times as greet es fall flow volumes. <br />Site YSS4 was located epproximat ely 2670 feet downstream of Site YSSF3 in Section 11, <br />R86Y. Instantaneous flow data was collected at this site from 7/79 until 5/86. Yith the <br />exception of one monthly flow measurement (11/79), the channel reach at Site YSS4 <br />exhibited perennial flow for the period of monitoring. From a review of the instantaneous <br />flow hydrograph s, the period of snowmelt influence starts in April and extends to July. <br />The largest peak flows occur in the spring during the snowmelt influenced runoff period <br />end range from 3.5 to 8.5 cfs. However, significant summer end fall peek flows were <br />measured in 1980, 1983, end 1984. Instantaneous peak flovs during these letter 2 seasons <br />ranged from 3.5 to 7 efs. Typically, summer and fall peak flows were <1 cfs. Tabulation <br />of the seasonal flow statistics shows mean flow rates in the spring are 2.8 cfs, while <br />summer and fell mean flows 1.8 end 1 cfs, respectively. Site YSS4 has been replaced by <br />flume Site YSSF3. <br />Y-1 Tributary to Sage Creek. Site YSS3 is located in the Y-1 tributary approximately 400 <br />feet above the Y-1 pond outfall (Site YSSF2) which is immediately uptributery of the • <br />confluence with Sege Creek. Site Y553 is located in Section 19, RB7Y (see Exhibit 7-1). <br />Site YSS3 was established in 6/91 and instenteneous flow measurements have been obtained <br />98 <br />