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Where is the Water ?. The Worlds Largest Rivers. The Hydrologic Cycle. Infiltration = Groundwater System. Runoff = Surface Water SystemRunoff = Precipitation - Evapotranspiration. . . . . . . . . . . . U.S. Precipitation Map. U.S. Runoff Map . . . . Notice the effect of the Rocky Mountains. Laminar vs. Turbulent Flow.
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