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PERMFILE112193
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PERMFILE112193
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Last modified
8/24/2016 10:08:36 PM
Creation date
11/24/2007 9:17:16 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
pages 2.5-108 to end of Append 2.5-B
Section_Exhibit Name
2.5 Hydrology Part 2 & Appendix 2.5-A & -B
Media Type
D
Archive
No
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• late 1985, once the stream channel had stabilized. A continuous flow <br />monitoring station at TR-b was not re-established at that time due to <br />continued instabilities of the stream channel. Several attempts were made <br />between 1985 and mid-1999 to establish and maintain a staff gage at the TR- <br />b location. However, each time a staff gage was established, the gage was <br />dislodged by high flows or the area became inundated from a beaver dam <br />being build a short distance downstream rendering the staff gage readings <br />meaningless. A continuous monitoring station for TR-b was eventually able <br />to be established in late July 1999. <br />In order to provide a more complete data base for the analysis, a <br />flow relationship between TR-a and TR-b was developed using all paired flow <br />data collected between 1979 and 1996. Flow data collected at both stations <br />during 1979 and 1980 consisted of weekly average values. The weekly values <br />are believed to be derived from instantaneous daily measurements. <br />Therefore, only 1979-1980 weekly averages containing seven observations at <br />both stations were used in developing the TR-a/TR-b flow relationship. All <br />available paired daily values from the 1981-1996 data base were used in <br />developing the TR-a/TR-b flow relationship. Using this procedure, <br />estimates of daily flow values were calculated for missing data at TR-a and <br />TR-b. The resulting equation which expresses this linear relationship is y <br />• = 1.0315x + 6.6901, where y = TR-b flow (cfs), x = TR-a flow (cfs), 6.6901 <br />= constant, r2 = 0.80 (correlation coefficient) and n = 1,063 (number of <br />paired values). Using this procedure, estimates of daily flow values were <br />calculated for all missing data at TR-a and TR-b, except for one missing <br />value at TR-a. The missing value that was not calculated would have <br />resulted in a negative flow value for TR-a due to the extremely low flow <br />recorded at TR-b (0.09 cfs; August 9, 1999). <br />As previously mentioned, the CDPS discharge data occurred in two <br />forms. Individual values were available for discharge points 002, 003, and <br />006 for the majority of the record, while only a single value for the <br />combination of the flows (007) was available for the latter part of the <br />record. The CDPS flow data was standardized by converting the individual <br />discharge point values (002, 003, and 006) into single combined values to <br />represent the flow from discharge point 007. This was accomplished simply <br />by summing the individual flow values for a given date to calculate the 007 <br />value for that date. Calculated values for 007 used in the analysis <br />consisted only of values which were either recorded at that site or <br />contained the requisite corresponding individual values from each of the <br />discharge points. The measured and estimated flow values along with the <br />• discharge measurements were then used to develop a flow balance equation <br />for Trout Creek. <br />Renewal 3 2.SA-2 June 13,1997 <br />--~ <br />
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