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<br />-4- <br /> <br />on currently available data, it is doubtful if sufficient <br /> <br />data exists in the Minturn, Eagle, Vai 1, Vail Pass and <br /> <br />Piney Lake area to establish a reliable isohyeta1 map for <br /> <br />~ <br />C".)"-' <br /> <br />.~;> '"1 <br /> <br />major event type storms, such as 25 year, 50 year, and 100 <br /> <br />year recurrence intervals. Synthesis of major event type? <br /> <br />hydrology will be necessary. This type of analysis will <br /> <br />require evaluation of the orographic effects of the Gore <br />Range and transposition of similar type storms into this 7 <br /> <br />a rea. <br /> <br />The design storm precipitation will have to be reviewed <br /> <br />as to seasonal applicability, i.e., summer and late summer <br /> <br />thunderstorms of high intensity are normally associated with \".1. <br />cumu1as cloud cells and, therefore, are relatively localized. <br />Larger system type storms resulting from Pacific Coast fronts <br />moving inland through the Rocky Mountain region will produce <br />rainfall over the total basin but will be less intense in <br /> <br />the rainfall rate. The consideration of a warm, wet spring <br />storm ~f major proportions occurring while a saturated <br /> <br />snowpack of significant depth is still covering the basin <br /> <br />or a large percent of the basin will be included in the <br /> <br />design storm hydrology phase of the study. <br /> <br />IV. DEFINITION OF HYDROGRAPHS <br /> <br />The parameters of the sub-basins, which were established <br /> <br />'under Phase II of the study, will be utilized to define the <br /> <br />unit hydrographs for each of the sub-basins and design points. <br />