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f <br />1 <br />Figure 9 <br />8,000 <br />7,000 <br />6,000 <br />5.000 <br />Cn <br />LL <br />U 4,000 <br />3 <br />0 <br />3,000 <br />Typical Undepleted <br />Maybell Hydrograph <br />(Average Year) <br />Possible <br />ISF Administrative <br />Threshold <br />m m A m m O i 0 <br />LL $ f <br />2,000 <br />1,000 <br />0 <br />Option 2b - 10 Year Running Total <br />Concept: In this option, seasonal flow volumes over the preceding ten -year period and <br />a seasonal "administrative threshold" would be compared to observed flow at Maybell. <br />The threshold would be defined by deducting a future development allowance from <br />presently available flows. Administration of the instream flow call would only occur if <br />the observed seasonal flow was less than the threshold value aild the 10 -year running <br />total volume for the season was less than ten times the threshold value. <br />Advantages: <br />• explictly provides for seasonal and interannual variability <br />• administration based on observable flow conditions (current and previous years) <br />• provides "credit" for excess flow produced in wet years <br />• volume administration for a pre - determined period <br />Disadvantages: <br />• requires slightly more complicated accounting <br />• administration not based entirely on current flow conditions <br />• no minimum base flow <br />