The end of a long tunnel of water usage in arid regions, especially Phoenix is the Colorado River.
The state of Arizona gets the water flow of the Colorado River with the help of a long tunnel, especially the canal of The Central Arizona Project. One of the purposes of flowing water from the Colorado River through this long canal is used for the irrigation of agricultural land. This canal also functions to control sediment, flood control, and fish conservation.
In conclusion, the end of a long tunnel of water usage at Phoenix is the Colorado River.
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