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74 I I I I I I I I I I I I I I I I I I I The Modified Release Patterns, Except For The Releases To Mimic Pre-Dam Flows, Are Generally Beneficial To Downstream Resources Figure VII-7 shows the impacts of the modified release scenarios for all critical resources combined on one matrix. The resource targeted by the scenarios are shown at the left of each row of the matrix. This matrix can be scanned vertically to see how each re- source fares under the various scenarios. For example, the . four question marks under Chub reflect the un- certainty about the flows needed to increase rearing habitat in the Little Colorado River. The pluses under Trout Fishing reflect the improved fishing conditions that would result from all scenarios since they all in- volve dramatic reductions in the frequency of very low, very high, and fluctuating releases. The pluses for vegetation and wildlife reflect benefits of removing floods. The pluses for common native fish reflect the improved quality and stability of backwaters when fluctuating flows are eliminated. The minuses in the matrix highlight areas where efforts to improve one resource would likely harm another. The major conflict is between the increase in humpback chub populations caused by high water in the summer and loss of sand because of increased sediment transport under the humpback chub scenario. Impacts Of INCREASING POWERPLANT CAPACITY From 31,500 cfs To 33,100 cfs Cannot Be Assessed At This Time The changes in dam operations due to the Uprate and Rewind Program are not yet determined. It is not possible at this time to specify precisely how the new powerplant capacity will affect future dam operations. variability in forecasts, management options, and physical system limitations will impact the actual releases scheduled. The way that the new capacity will be used has not been formalized, and until it is, impacts cannot be assessed.