Laserfiche WebLink
<br />11 <br /> <br />storage gage data. Priority 5 data generally were not used directly in <br /> <br />positioning the isohyets. Priority 1 stations were used "as is" with no <br />adjustments needed. <br /> <br />Figure 1 shows clearly the low number of high priority (complete <br />and near complete 30-year data sets) data points in Colorado. Using <br />priority 1 and 2 stations only, it would have been nearly impossible to <br />produce a map of the scale and resolution we desired. Adding short <br />record length and seasonal data to the analyses (Figure 2), was <br /> <br />imperative to achieve reasonable data density particularly in the <br /> <br />mountains. <br /> <br />A. "Normal-ratio" adjustment procedure <br /> <br />Priority 2 stations (25-29 years of complete data) ranged from <br /> <br />stations with just one missing month to as much as 5 consecutive years <br /> <br />of missing data. For these stations, the "normal-ratio" procedure was <br /> <br />used to estimate monthly precipitation for each missing month. The <br /> <br /> <br />"normal-ratio" procedure (Linsley et al., 1982) for estimating missing <br /> <br />monthly precipitation totals is described by the following equation: <br /> <br />EST. <br />J <br /> <br />I <br />= <br />I <br /> <br />PMON. <br />1 <br /> <br />PAVG. <br />1 <br /> <br />x <br /> <br />PAVG. <br />J <br /> <br />where <br /> <br />EST. = estimated precipitation value for a specific month at <br />J <br /> <br />station j. <br /> <br />PMDN. = recorded precipitation values for the specific month at <br />1 <br /> <br />each of the i 3D-year stations within the same cl imatic <br /> <br />region as station j. <br />PAVG. = 3D-year normals for the specific month at each of the i <br />1 <br /> <br />stations in the same climatic region. <br />