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<br />r-.. <br />C\J <br />~ <br /> <br />A comparison between the flow pattern at West Beaver and that of the entire Beaver Creek <br />C. Basin for May 21-26, 1979 is presented in Figure 3. Total basin flow is represented by the <br />combined flows of the Beaver Creek and Gurley Ditch gages. The ratio of the hourly flow to the <br />six-day mean is used to facilitate comparison of the diurnai patterns. Both curves follow the <br />same pattern with the combined flow lagging the West Beaver flow by a few hours. This <br />indicates that the flow pattern at the West Beaver gage is indeed representative of the pattern at <br />other tributaries. Deviation from the West Beaver pattern would be visible in the total basin <br />pattern. <br /> <br />The analysis of West Beaver Creek diurnal flow patterns was conducted in terms of length of the <br />melt period, changes in the diurnal pattern over the melt period and predictability of hourly flow. <br /> <br />Lenoth of Melt Period. The melt period is defined here arbitrarily as the time from the day that <br />mean daily flow first exceeds 30 cfs until the day it last exceed 30 cfs. Figure 4 displays graphs <br />of the mean daily flow for the melt seasons analyzed. Table 6 presents information about the <br />melt periods. The melt period varies considerably from year to year but generally begins during <br />the first weeK of May and continues until the last week of June. As can be seen from Figure 4, <br />during the early part of the melt period, mean daily flow frequently falls below 30 cfs for a few <br />days before continuing to rise. The number of days that the mean daily flow exceeds 30 cfs is <br />presented in Table 6. It varies from 34 days in 1976 to 51 days in 1980, averaging 43 days for <br />the study period. <br /> <br />TABLE 6 <br /> <br />MELT PERIODS AT WEST BEAVER CREEK NEAR NORWOOD <br /> <br />Year <br /> <br />Melt Period 1) <br /> <br />Length of Melt <br />Period (Davs) <br /> <br />Days that Flow <br />Exceeds 30 cfs 2) <br /> <br />1976 <br /> <br />5/2 - 6/8 <br /> <br />38 <br /> <br />34 <br /> <br />1977 <br /> <br />1978 <br /> <br />4/26 - 6/25 <br />5/7 - 7/3 <br />5/20 - 6/27 <br /> <br />61 <br /> <br />49 <br /> <br />1979 <br /> <br />58 <br /> <br />51 <br /> <br />1980 <br /> <br />39 <br /> <br />39 <br /> <br />1) Dates from the time mean daily flow first exceeds 30 cfs until the time it last exceeds 30 cfs. <br /> <br />-2f Number of days in Melt Period when mean daily flow exceeds 30 cfs. <br /> <br />6 <br /> <br />I <br />