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Flash floods

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Flash floods

Post by Guest on Thu Sep 30, 2010 9:47 pm

Native civilization reached its peak from 600 to 900 A.D. in the Colorado watershed, but began a general decline afterwards. Around the 13th century and 14th century, near the height of a second peak, the Anasazi and Hohokam cultures suddenly "disappeared" from the lands around the Colorado River.[18] Their demise is believed to be linked to the overuse of water for irrigation combined with a severe half-century drought. Intensive irrigation raised the water table while increasing the salinity of the soils used for farming, eventually making them unsuitable. Flash floods during the 12th century and 13th century were probably responsible for the demise of the Chaco culture, and the Navajo and Puebloan people who lived in the high desert in the Four Corners region near present-day Lake Powell declined as well.[19]
It is believed that during the severe droughts of the three centuries surrounding the 13th century, many of the peoples that once inhabited the upper regions of the Colorado watershed migrated to the Rio Grande valley and the Painted Desert in the Little Colorado River region.[20] Many of the people in the Hopi and Zuni tribes of the Sonoran Desert, as well as the Acoma and Laguna people on the Rio Grande, are believed to be descended from the ancient inhabitants of the northeastern Colorado Plateau.[19]

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