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1986 = 0.294 cfs " <br />1985CY (Calendar Year) = 0.357 cfs " <br />1984CY = 0.447 cfs " <br />1983CY = 0.154 cfs (reservoir did not completely <br />fill until March 7, 1983) <br />This year's average flow value, 0.091 cfs, is 640 lower than the <br />historic (1983-2014) average flow value, 0.250 cfs. The timing of when <br />flow values are collected affects these averages. Flow values from Pond <br />004 have also been affected by the reduced diameter of the discharge <br />culvert modified on May 29, 1987 (36 -inches to 6 -inches). In August <br />2005, the discharge culvert was replaced with an 8 -inch diameter plastic <br />culvert set approximately one -foot above the previous elevation. On <br />August 20, 2015 the old Parshall flume was replaced with a new 2 -foot H - <br />flume. Review of the TDS plot indicates an increasing trend, however <br />the peak value occurred in September 2005, therefore it appears to be <br />stabilizing. <br />Surface Water Site SW -S2-10 (SSC10). <br />This site monitors Cow Camp Creek below Pond 004 at its confluence with <br />Fish Creek. It is normally monitored in June and July on a monthly <br />basis. This year it was sampled in June, and no flow was observed in <br />July. The extra samples collected in March, April and May were part of <br />the selenium study. This site usually dries up in late summer, although <br />NPDES4 upstream flows continuously. The reduction in flow is due to <br />stream channel infiltration, evapotranspiration and the absence of <br />lateral inflow from tributaries to Cow Camp Creek. The TDS plot reveals <br />an increasing trend. <br />Little Grassy Creek Drainage. <br />Two monitoring sites lie within the Little Grassy Creek drainage: SSLG5, <br />located in the upper part of Little Grassy Creek, and NPDES Discharge <br />Point 002, also known as the Wadge Impoundment or Pond 002. <br />13 <br />