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G – Bi-seasonal HCI Relationships <br />December-March Precipitation <br />For all of the Districts the single-seasonal relationship between the AMO and <br />ENSO indices that have been discussed numerous times in this report still remain with <br />the AMO being the apparently most robust relationship of the group. The AMO, SOI and <br />MEI should be consulted for guidance for two-year wintertime precipitation values. <br />April-September <br />The spring precipitation (two-year) relationships are very similar in nature to the <br />Dec.-March period with some variability with respect to District. The user is directed to <br />this section for guidance. <br />Seasonal (Apr-Sept) runoff <br />The AMO continues to demonstrate a very tangible value in the hydrology of the <br />basins of Division 7. Simply put, if one is interested in the potential for bi-seasonal <br />runoff, a user may wish to consult the AMO values exclusively for direction as to how to <br />assess the runoff from two consecutive peak years. ENSO still has a non-random impact <br />on the basins and could be consulted to potentially refine the product. An example of this <br />robust relationship can be found Figure 17. <br />Figure 17. Relationship between the July-Nov. AMO vs. the Apr. - Sept. naturalized stream flow for <br />the San Juan River at Pagosa Springs for the following two consecutive years. <br />26 <br />