A map of tritium–helium-3 ages measured in drinking water wells from Los Angeles and Orange counties. A general pattern of increasing age away from the artificial recharge areas (where water entering the aquifer reaches saturation) is observed. The red line shows the boundary between younger groundwater and groundwater more than 50 years old. The measured age shows the direction and rate the groundwater in the aquifer is flowing.
We can easily imagine the main feature of the agricultural core with the name of itself. The agricultural core’s environmental characteristics – rainfall, length of growing season, relief, soils and waterways – allow farming to excel. The natural network of waterways permits easy and inexpensive shipment of farm goods to markets and other ports. As Los Angeles gets bigger and bigger, water problems have been issued for a long time. Today, restaurants in Los Angeles don’t provide water to their customers before they request. According to Water Education Foundation, Los Angeles gets its water from four sources; State Water Project, Colorado River, Other Major Water Systems, and Groundwater. The State Water Project is a major source of supply for cities in Los Angeles. The project includes 22 dams and reservoirs, and California is entitled to 4.4 million acre-feet of water annually from the Colorado River. A number of large population centers in California have developed their own extensive water projects. Lastly, I was surprised that about 30 percent of California’s total annual water supply comes from groundwater in normal years, and up to 60 percent in drought years. I never thought of groundwater, and the amount of the usage was interesting to me.
Sources: http://www.water-ed.org/watersources/community.asp?rid=9&cid=562
img -> www.llnl.gov/str/May03/Moran.html
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