Riparian Heritage
It is estimated that less than 10% of Arizona's original riparian acreage
remains in its natural form. -- Arizona Riparian Council
Comparing the current and historical data illustrates the changes to
Arizona’s rivers: Arizona has lost 35% of our natural perennial flow. The
loss has been greatest on Arizona’s big rivers – the Colorado, Gila, Salt,
and Verde rivers – where 91% of free-flowing perennial miles have been
lost. - Arizona Freshwater Assessment, The Nature Conservancy (2006)
Holes in the Bucket?
Barriers to environmental water allocation in Arizona
1. Bifurcation of Water Rights System
2. Surface Water Rights Adjudication
3. Uneven Regulatory Authority
4. Market Competition
5. Environmental Water Needs
Water to Protect and Restore Riparian Heritage:
A problem with deep taproots, sprouting solutions
1941 |
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Wildlife, including fish” becomes beneficial use |
1978 |
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TNC applies for first instream flow application |
1990 |
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First Instream Flow Permit Issued |
1991 |
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ADWR Instream Flow Guidelines issued |
1994 |
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Arizona Water Protection Fund |
2000 |
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Gila IV: Subflow Settled? |
2000 |
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SDCP STAT adopts Riparian Protection and Restoration Element |
2001 |
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Governor’s Water Management Commission recommends riparian protection zones |
2003 |
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U.S. FWS issues Incidental Take Permit to SRP for Roosevelt Dam, activating 2002 HCP |
2005 |
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Phelps Dodge Case settles diversion issue |
2007 |
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Pima County Water Resource Element Amendment approved |
2007 |
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Sonoran Institute’s Sustainable Water Management Framework |

West Branch (Photo: Arizona Land and Water Trust)