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<br />The largest comparative difference in these gages is Potter Creek at about 17%. This is welt within the <br />standard error of the regional equation. However, the gage record for each of these creeks is limited. <br />Therqfore, two other creeks with a longer representative period of record were chosen to compare with the <br />regiotlal equations. <br /> <br />Escalante Creek near Delta: Period of record; 1977 - 1988 <br />Tabeguache Creek near Nucla: Period of record; 1947 -1952 <br /> <br />Both of these gages are affected by diversions and irrigation. Using data obtained from Colorado River <br />Decision Support Systems (Colorado Water Conservation Board, Department of Water Resources) that <br />reflects diversion volumes, along with local estimates of irrigated acreage and return flows, the annual gage <br />volunj1es were adjusted for these variations to estimate a natural annual volume. <br /> <br />Escal~nte Creek near Delta: <br />Mean annual adjusted gage volume: 84,000 ac-ft <br />Annual volume regional equation: 75,000 ac-ft <br />Tabeguache Creek near Nucla: <br />Mean annual adjusted gage volume: 15,000 ac-ft <br />Annual volume regional equation: 13,900 ac-ft <br /> <br />The gl1ge data-regional equation comparison between these two gages coupled with the results from Potter <br />Creek. Hay Creek, and Spring Creek indicates that the regional equations apparently provide a reasonably <br />accurate estimate of the total annual flow volume. <br /> <br />Once total annual volumes can be estimated, the question then becomes how to allocate this volume over a <br />12-month period. A mean annual monthly distribution was calculated using the annual hydrographs from <br />Porter: Creek, Spring Creek, and Hay Press Creek. These three creeks were used since they are the best <br />unaltered representations of a natural plateau flow regime. The monthly distribution of volwne based on a <br />percentage of annual total volume is as follows: <br /> <br />Januaty: 0.32 <br />FebTUary: 0.6 <br />March: 1.0 <br />April: 14.7 <br />May: 55.4 <br />June: 24.6 <br />July: 1.3 <br /> <br />I <br /> <br />TT' <br />