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• Instantaneous flow records for this location began in 1989. Prior to this time, <br />flooding which occurred during 1989 caused continual instabilities in the stream <br />channel at this location for several subsequent years. As a result, re-establishing <br />a monitoring station was not possible. <br />In 1988, a new stable reach of the stream channel was located and a monitoring <br />station was re-established. However, the majority of the 1988 season was spent <br />developing a stage rating curve for the channel cross-section with flow measurements <br />being taken on a sporadic basis rather than in conjunction with water quality <br />sampling periods. <br />Instantaneous flow measurements were made at TR-b during 1969 in conjunction <br />with water quality samples taken at TR-D, except for the October sampling period. <br />Between the sampling periods of September and October in 1989, beaver activity both <br />above and below TR-b occurred causing the location of TR-b to become part of an <br />inundated beaver pond. High flows, in part due to beaver activity, destroyed the <br />staff gauge at TR-b in 1990 and again in 1991. As a result, no instantaneous <br />streamflow data was collected in 1990, while 1991 had one measurement in May. <br />All sampling periods between April 1992 and July 1993 had flow measurements <br />and water samples taken on the same day at TR-b and TR-D. Between the sampling <br />periods of July and August 1993 beaver activity had resumed below TR-b rendering the <br />station unsuitable as a flow monitoring location. In June 1994, a continuous flow <br />• monitoring station was installed at a new location downstream of the previous <br />location. Calibration flow measurements taken at TR-b during 1994 only covered a <br />small range of flow variation due to the normal low flow during the summer and fall <br />of the year. Additional calibration flow and cross-section measurements were taken <br />during 1995 to develop a stage/flow rating curve representing the full range of flow <br />conditions. <br />Over the 1994-1995 seasons, a total of five cross-sections (two in 1994 and <br />three in 1995) were developed and compared to ensure channel stability. All of the <br />cross-sections varied no more than two-tenths of a foot at each measurement point <br />along the section. The variation among the cross-sections, similar to TR-a, was <br />primarily due to the specific placement of the survey rod on the creek's cobble <br />lined bottom. An averaged cross-section was developed for use with 9 sets of <br />velocity data to compute a stage/rating curve. The stage rating curve data covered <br />flows ranging from approximately 11 cfs to 120 cfs. The equation and r~ for the <br />1.1251 <br />curve are as follows: y = 57.092x where y = flow in cfs and x = depth of flow; <br />r2 = 0.98. As at TR-a, cross-section measurements were taken at TR-b periodically <br />through-out 1996 which verified that the channel configuration had remained stable. <br />Flow measurements for TR-a and TR-b corresponding to sampling dates are <br />provided at the beginning of Appendix A. <br />• <br />3 <br />