irrigation and the colorado river
DESCRIPTION
Irrigation and the Colorado River. From the University of Georgia (http://www.ugacfs.org/producesafety/Pages/Steps/USGrowingRegions.html). One of the country’s most prolific growing regions is in the Mojave Desert. Dams on the Colorado River. Lake Mead . - PowerPoint PPT PresentationTRANSCRIPT
Irrigation and the Colorado River
From the University of Georgia (http://www.ugacfs.org/producesafety/Pages/Steps/USGrowingRegions.html)
One of the country’s most prolific growing regions is in the Mojave Desert
Dams on the Colorado River
Lake Mead
Behind each dam, a lake forms. These are used as reservoirs for cities and for agriculture.
Elevations of Lake Mead
Note the high-water marks
for Lake Mead
Worldwide large aquifers and their “Groundwater Footprint”
From http://www.nature.com/nature/journal/v488/n7410/full/nature11295.html
Location of the Ogallala Aquifer
Center-pivot irrigation circles, Finney County, Kansas. Here, water is pumped from an underground aquifer and distributed through a giant sprinkler, up to 1/2 mile in length, that pivots around a central point.
From http://ga.water.usgs.gov/edu/gallery/irrigation-sprinkler.html
Center-Pivot Sprinkler Irrigated fields
Another typical irrigation sprinkler type
This is in Nebraska (from http://ga.water.usgs.gov/edu/gallery/irrigation-sprinkler.html)
From http://ga.water.usgs.gov/edu/wuir.html
From http://pubs.usgs.gov/sir/2013/5079/SIR2013-5079.pdf
From http://pubs.usgs.gov/sir/2013/5079/SIR2013-5079.pdf
From http://www.irrigation.org/uploadedFiles/Policy/PNP-WesternIrrigationImpact_8-2013.pdf
Should the environment be altered to benefit people by growing food using irrigation in dry-land regions like southern Arizona and the central valley of California?
How about the Great Plains (irrigated by drawing water from the Ogallala aquifer)? If we “let nature take its course”, in the case of drought, what are the consequences? The Kesterson Marsh was artificially created by the water diverted from the San Luis drain. If it isn’t natural, why can’t we allow this wetland to dry up, i.e., return to its natural state?
If not already answered, how does the GAIA concept fit here?