Re: Irrigation

Posted by MarkB_MI on October 27, 2006 at 18:37:14 from (64.31.11.74):

In Reply to: Irrigation posted by KEH on October 27, 2006 at 14:25:16:

I suggest you read "Cadillac Desert" by Mark Reisner. It's a very detailed history of how water has been exploited in the West, and talks quite a bit about salinity. It turns out that every great civilization that depended on irrigation eventually failed, usually due to increasing soil salinity. The only exception is Egypt, which until the construction of the Aswan Dam had annual floods to replenish its top soil.

The little amount of Colorado River water that flows across the border into Mexico is so salty it is nearly useless.

Not all irrigated land is affected the same by salinity. In some cases the salinity comes from the water, in other cases the soil itself is very salty.

Replies:

• Re: Irrigation KEH 16:50:16 10/28/06 (0)

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