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<br />7 <br /> <br />IV. Analysis <br /> <br />~ <br /> <br />Data from all stations were assembled into a uniform data set <br />consisting of monthly precipitation values October 1950 through <br />September 1980. Seasonal data sets such as storage gage data and the <br />SCS snow course data were processed separately since they did not <br />contai n monthly readings throughout the year. All monthly data were <br />checked for accuracy and, when necessary, compared with thei r or i gi na 1 <br />hand-written daily observation form. For all complete years, annual <br />totals along with October-April and May-September seasonal totals were <br />calculated. All missing or incomplete months and years were flagged for <br />later consideration during the adjustment procedures. <br />An important aspect of this precipitation analysis was "adjusting" <br />all precipitation to be consistent with the complete 1951-1980 period. <br />Separate procedures were used depending on the type of gage used <br />(standard raingage, storage gage, etc.) and the priority assigned to the <br />station. Each procedure for adjustment is outlined separately. <br />Priorities were assigned to each station based on the length of <br />record and the quality of the data collected. Table 1 shows the <br />priority definitions that were were used and the impl ication that had <br />for the analysis. Stations which were used in this analysis are listed <br />in the appendix according to thei r priority ratfng-. The approximate <br />locations for these stations are shown in Figure 1 and 2. The first 3 <br />categories contained mostly NWS weather stations. SCS snow course data <br />and some USFS and BLM storage gage data were given a pri ority rating of <br />4. Data from priorities 2-4 all needed some adjustment before being <br />used. No adjustment was performed on priority 5 data which was composed <br />.of miscellaneous short record stations (5-14 years) and much of the old <br />