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Lyle Watts Talks to the Rangers in San Dimas Experimental Forest, California

Rangers with Lyle Watts, center with hand on hip, examine lysimeters in San Dimas Experimental Forest, California. A lysimeter measures the amount of water lost to evapotranspiration in a certain area of soil. Evapotranspiration amounts are the sum of the amounts of water lost through evaporation and transpiration of the plants.