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REP03243
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Last modified
8/24/2016 11:34:04 PM
Creation date
11/26/2007 10:27:30 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Report
Doc Date
2/25/2005
Doc Name
2004 Annual Hydrology Report
From
WWC Engineering
To
DMG
Annual Report Year
2004
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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results of the gauging stations along Trout Creek indicate that the monitoring program is being placed on-line early enough in <br />the year to record flow prior to the peak runoff period for each year. The individual data points show the monthly average <br />flows and give some indication of the variability between mild winters (winters of less snow accumulation) and harsh winters. <br />The graph showing 2002-2004 data indicates a decrease in total streamflow in 2004 from 2003 and an increase from 2002 <br />levels. The 1995-2004 graph suggests that 2004 was a mild winter for the past decade. <br />The flow record for 2004 shows a low peak Flow to have occurred in May as it did during 1996, 2000 and 2001. The <br />runoff from the mine site was lower in 2004 than in previous years due to less snowpack on the mine site and the on-set of <br />warmer temperatures occurring earlier in the spring. The flow data presented in Figure I consists only of information derived <br />from continuous flow records. Instantaneous flow measurements obtained between ] 989 and June 1994 for this location are <br />provided in Appendix A. Prior to that time, instability of the stream channel caused by a 1984 flood precluded the installation <br />of any type of monitoring station in the vicinity. The old Stevens chart recorders were replaced with electronic streamflow <br />recorders in April 2003. <br />The bridge located immediately downstream of TR-a was replaced in the fall of 2001 potentially altering the current <br />stage rating curve. Therefore, the decision was made to update the stage/discharge curves for TR-a and TR-b. Over the 2001 <br />season, a total of nine cross-sections and associated velocities were measured at each cross section location. This data was <br />used to compute a stage rating curve at each location. <br />The stage rating curve for TR-a was developed from flows ranging from l 1 cfs to 145 cfs. The curve equation and rz <br />For the curve are as follows: y = 44.469x3.zxoe where y =flow in cfs and x =depth of flow; r- = 0.98. Flows for much of 2004 <br />were below the 11 cfs used to develop the rating curve; therefore, the calculated flows may to be low. <br />The stage rating curve for TR-b was developed from flows ranging from 13 cfs to 144 cfs. The curve equation and rz <br />for [he curve are as follows: y = 65.049x2.431, where y =flow in cfs and x =depth of Flow; rz = 0.99. Flows for much of <br />2004 were below the 13 cfs used to develop the rating curve; therefore, the calculated flows may to be low. This appears to <br />indicate a good correlation between the upstream and downstream flows. <br />
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