The extensive mileage of levees is partly necessary the Southwest is technically known as the Yuma pro- if not entirely washed away by the flood currents. to protect the main irrigating canals, of which there ject, as it is intended to irrigate an extensive territory The plan adopted was decidedly… … The diversion dam' or La- unusually difficult. There is no natural formation of guna dam, as it is called, will which engineers can take advantage, as in many other extend for a distance of 4,780 portions of the West, where nature has thrown up feet across the Colorado at a rock walls which can be…
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