Dear HCN,
In the West, water is a
pervasive issue, and it is a common theme among
HCN articles. “Bringing back the bosque,” and
“Will Salt Sink an Agricultural Empire?” (HCN, 11/19/01: Bringing
back the bosque) touch this subject.
These
articles leave one believing that the battle between agriculture
and ecological water could never be resolved. It is a power
struggle and winner takes all. I cannot help to wonder: Hasn’t
anyone heard of drip irrigation? These agricultural lands can be
just as productive without “flooding” the land with irrigation
water. Drip irrigation uses only a fraction of the water that
traditional irrigation does. It leaves most of the water where it
belongs; in the rivers. Less water means less salt. Less water
makes desalination economically feasible, if it were still
necessary. Drip irrigation produces little or no drain-water, and
thus no selenium problem.
Some will argue that at
$500 to $1,500 per acre, its cost is too high. This can only be
true in relation to the cost of water. Drip irrigation is already
used extensively in Arizona and Southern California, where water is
decidedly more precious. When the full extent of ecological impacts
are taken into account, the investment in drip-irrigation systems
is undoubtedly quite small.
Conservation is the
“easy” answer to most environmental issues. With water in the West,
it is the only answer. The rivers need to run free for their own
ecological health as well as the coastal waters that they drain (or
drained) into. River deltas (a.k.a. estuaries) provide the most
important spawning habitat for ocean fishes. Is there any wonder
that fish stocks are so depleted?
There is an
answer to the water wars of the West. It does not involve
bulldozers and ditches and dams, the goliath machinery of the 20th
century. It involves treading lightly with the smaller, lighter,
faster technology of the 21st. It is high-time to embrace drip
irrigation, before it is too late.
Michael Dray
Boulder,
Colorado
This article appeared in the print edition of the magazine with the headline Time to embrace drip irrigation.

