Chapter 9

Chapter 9 - Chapter 9: Water Resources I. I. The Hydrologic...

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Chapter 9: Water Resources I. The Hydrologic Cycle I.a. Hydrologic Cycle : vast currents of water, water vapor, ice, and energy flowing continuously in an elaborate, open, global plumbing system that has operated for billions of years from lower atmosphere to beneath Earth's surface I.b. A Hydrologic Cycle Model I.a.i. More than 97% of Earth's water is in the ocean where most evaporation and precipitation occurs I.a.i. 86% evaporation from ocean, 14% from land I.a. Surface Water I.a.i. Precipitation on Earth's surface will 1. flow overland or 2. soak into the soil I.a.i. Interception : occurs when precipitation strikes vegetation or other ground cover--> drains across plant leaves, down stems to the ground to form stem flow I.a.i. Throughfall : precipitation that falls directly to ground + drips from vegetation, not including stem flow I.a.i. Infiltration : when water soaks into the subsurface or penetrates soil surface I.a.i. Percolation : downward movement of water when it permeates soil
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Chapter 9 - Chapter 9: Water Resources I. I. The Hydrologic...

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