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E - Stream flow (April — September) <br />The summary of this section will be narrowed down to examining the naturalized <br />April- September flow into Pueblo Reservoir. The results of the individual stretched of <br />the river can be examined in the Data Appendix. In this stretch of river, the AMO and <br />NAO show some apparent influence on the river. There is some weak ENSO influence <br />(SOI) with La Nina years being consistently normal -to -dry but, El Nino conditions are <br />scattered around. An example of the NAO and AMO influence can be found in Figures <br />20 and 21. <br />Table 9. Summary of Apr. -Sep. Naturalized Streamflow/HCI Relationships for the Arkansas River <br />from the Headwater to Pueblo Reservoir (dark `X' indicates a relatively strong relationship and light <br />'X' indicates a relatively weak relationshin). <br />Figure 20. Relationship between the October - December. MEI vs. the Apr. - Sept. naturalized stream <br />flow for the Arkansas River at Pueblo Reservoir. <br />30 <br />PDO <br />MEI <br />SOI <br />Nino 3.4 <br />NAO <br />AMO <br />Arkansas into <br />Pueblo Reservoir <br />X <br />X <br />X <br />Figure 20. Relationship between the October - December. MEI vs. the Apr. - Sept. naturalized stream <br />flow for the Arkansas River at Pueblo Reservoir. <br />30 <br />