New water management strategies are needed in the western United
States. With mounting populations, over-tapped rivers, extended
droughts, severely damaged aquatic ecosystems, and the likelihood of
future impacts from climate change, water managers face increasing
challenges in locating reliable water supplies.
Some western water managers are working to conserve and reuse water
supplies. However, NRDC's research has revealed another trend. Some
water managers and entrepreneurs are pursuing a growing number of
proposals for long-distance water supply pipelines. Some of these
projects are extremely large in scale and would stretch for hundreds of
miles, raising a host of questions for water policymakers and the
public.
The maps below show a number of the of the more prominent pipeline
projects in the West. The first map includes existing pipelines,
constructed over the past century. The second map represents proposed
projects that are currently at different stages of development. These
projects were selected to include the largest pipeline projects, as well
as broad geographic representation.
Most of these existing pipeline projects were built in conjunction with
surface storage projects on major river systems. Those surface storage
projects were expensive and often came at significant environmental
cost. Nevertheless, they produced relatively reliable sources of water
for pipelines and aqueducts to carry to distant users.
Most of these proposed pipeline projects do not include new surface
storage facilities. This change is, to a large extent, the result of the
far less abundant water sources that these projects propose to tap
into. Together, these new pipeline proposals represent a significant new
phase in western water policy, presenting critical issues that must be
closely examined before proposed projects are pursued further.
These key issues include: 1) sustainability of water sources,
including potential environmental impacts, demands of existing water
users, and likely impacts from climate change; 2) conflicts regarding
transbasin diversions; 3) costs and potential alternatives, including
water use efficiency; 4) energy use; and 5) the role of federal
agencies.
Some proposed projects could have dramatic effects on the
environment, on existing water users, on water rates, and on the
reliability of water supplies for the communities that would be served
by them.
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