Selection of Manning's roughness coefficient for natural and constructed vegetated and non-vegetated channels, and vegetation maintenance plan guidelines for vegetated channels in central Arizona: U.S. Geological Survey Scientific Investigations Report 2006-5108, 41 p.

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Precipitation directly affects streamflow. Under normal precipitation conditions, Utah receives less precipitation than every other state except Nevada. Average annual precipitation at Salt Lake City is about 16.5 inches, and precipitation statewide ranges from about 5

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