SAR HS 396 Lecture Notes - Lecture 5: Yellow Fever, Waterborne Diseases, Eutrophication
9 Aug 2018
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Document Summary
Natural cycle by which water evaporates from oceans and other water bodies, accumulates as water vapor in clouds and returns to oceans and other water bodies as precipitation. Available freshwater 23% freshwater in icebergs 77% of 3% Artificial lakes produced by constructing physical barriers across flowing rivers, which allow water to pool and be used for various purposes. Water originating as precipitation on land then runs off the land into rivers, streams, and lakes, and eventually reaches the oceans, inland seas or aquifers unless it evaporates first. Stable runoff: portion of runoff that can be relied on year after year and easily used by humans challenges in they hydrologic cycle. Surface water: all water naturally open to the atmosphere (rivers, lakes, reservoirs, ponds) Ground water: supply of fresh water found beneath the earth"s surface, usually in aquifers, which supplied wells and springs. Criticality ratio: water stress depends on variability of resources.
