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Figure 9. Relationship between the NAO and a summation of naturalized stream flow in Costilla <br />County (District 35). <br />Oct -Dec NAO vs. Apr -Sep Naturalized Flow for Ute Creek, Trinchera Ck., San.de.Crist and <br />Culebra Cr. In Costilla County <br />L4 E <br />_ <br />Oki — + - - -- <br />_ i ♦ <br />i <br />5„00 .¢ <br />i <br />LL <br />♦♦ <br />PA <br />♦ <br />-2.00 -1.75 -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 <br />Oct -Dec NAO Value <br />F - Single Seasonal Runoff Timing <br />The timing aspect of the runoff in the basin was examined by looking at the <br />comparison of the Julian Date of the 50% point of the April -July peak seasonal flow <br />verses the HCI values. Before this was performed (, it was necessary to determine the <br />relationship of the date of 50% flow and the actual volume of that year. It should be <br />noted that the period of record available for the daily naturalized stream flow data in this <br />Division is 1969 -2002 thus limiting the data points available for analysis. In the case of <br />the flow at Del Norte, the overall relationship between the 50% seasonal flow mark and <br />the volume was significant enough that we examined the residual (or in effect taking out <br />the effects of volume) to determine the seasonal effect. The result was that there was that <br />only AMO (positive = earlier runoff mid - point) appeared to have some impact however, <br />in looking at the individual relationships with the AMO correlation charts, this impact did <br />not appear to be as clear therefore we do not recommend any use of HCI to foresee runoff <br />timing from the seasonal standpoint without further investigation at a later time or by the <br />user. <br />G — Bi- seasonal HCI Relationships <br />A portion of this project was dedicated to briefly examine the potential of using <br />HCI values in a `multi - seasonal' format to assess the potential utility of this information. <br />16 <br />