WSP11307

• File Number: 8200.300.10.A
• Description: Colorado River Basin Legislation/Law - Interstate Water Transfers
• Basin: Colorado Mainstem
• Date: 12/1/1997
• Author: USDOI/BOR
• Title: Draft: Programmatic Environmental Assessment for Proposed Rule Making for Offstream Storage of Colorado River Water and Interstate Redemption of Storage Credits in the Lower Division States
• Water Supply Pro - Doc Type: Publication

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Executive Summary

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As a part of the Water Bank implementation process, the Arizona Water Banking Authority enabling
legislation mandates that the Water Bank develop a Storage Facility Inventory of all existing storage
facilities by March 1, 1997, The Storage Facility Inventory is to determine 'whether storage facilities exist in
this state to meet the water storage needs of the authority for the following ten years," AR,S, ~ 45-
2452(0), This Storage Facility Inventory has been developed in consultation with the Arizona Department
of Water Resources and the Central Arizona Water Conservation District,

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The Water Bank has chosen to prepare this Inventory by examining four regions of the State: 1) the

Phoenix Active Management Area (AMAI, 2) the Pinal AMA, 3) the Tucson AMA, and 4) the remainder of

the State, Each of the four regions of the State were examined for existing storage facilities that are

physically capable of storing CAP water. This capacity was then compared to estimated Water Bank

storage needs for each area. For purposes of this Inventory, it was assumed that storage capacity

requirements based on expending the funds that will be available to the Bank provide a reasonable

estimate of the storage capacity the bank will require for the next ten years, Water management concerns

raised by the Arizona Department of Water Resources were also considered,

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In preparing this Inventory, the Water Bank has also assumed that reexaminations oflhe storage facility

inventory will be necessary more frequenlly than the statutory minimum of every five years, at least during

the early operation of the Water Bank.

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Based on the information gathered, the Arizona Water Banking Authority makes the following findings and
conclusions concerning the need for additional storage capacities in Arizona:
1) storage facilities exist in the Phoenix AMA to meet the Authority's needs for the next ten
years;
2) storage facilities exist in the Pinal AMA to meet the Authority's needs for the next ten

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3)

years;
storage facilities do not exist in the Tucson AMA to meet the Authority's needs for the next
ten years; and
because Water Bank services can be provided to all of its constituents by banking water
within the AMAs, no storage facilities are necessary in the areas of the State outside the
Phoenix, Pinal and Tucson AMAs to meet the Authority's needs for the next ten years,

4)

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