Similar canals in California bring water from the Sacramento Delta to Central Valley agriculture and Los Angeles and also from the Colorado River to the Imperial Valley and San Diego. None of them are covered
+Bob Morris Ya, but decreasing the evaporation rate also serves to decrease rainfall levels downwind; and since most of California's food comes from downwind, and farmers like the rain; it probably is not as great of an idea as it sounds like at first glance. It evaporates for many reasons that serve many more purposes.
+Brian Prewett Not sure what you mean. Most water in California originally comes from mountains, the Sierras or Rockies. The Central and Imperial Valleys get little rainfall. Does evaporation from canals make that much difference?
+Bob Morris Would the water loss protection that having the solar panel over the canal provides be a major selling point if the amount of water lost from canals through evaporation was not a decent factor?
I think it would be more effective to put the solar panels half an inch under the water level of the ocean so that they evaporate water to make rain, rather than trying to save a few gallons of fresh water in a canal. Or a Fresnel lens focused on a slightly submerged black background to facilitate the evaporation of the ocean water; causing it to rain downwind somewhere would be a more effective way to move fresh water to hard to reach dry spots around the planet.
Smart,in a country where the sun is absorbing a lot water at daytime.. +Brian Prewett yeah right, half an inch under water...to evaporate water and make rain....i guess u don't know which way the wind blows huh?