Re: Stream Flow


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Posted by D Porter on February 28, 2004 at 11:57:42:

In Reply to: Re: Stream Flow posted by Harold Ericsson on February 28, 2004 at 11:12:57:

Evapotranspiration (ET) is a tool I use in farming to determine irrigation schedules. It however can be relevant where ever you have soil, water and vegetation. ET is given in inches per day or per week. ET is the sum of soil evaporation and crop (or plant) transpiration. For a base line all ET figures are for the rate of water use for "healthy pasture grass". Various crops or other vegetation have a crop coefficent or multiplier.Let me walk you through an example. Lets take an average Fresno, California June 15th. ET is .267 inches per day.Remember this is for pasture grass. Corn has a crop coefficent or mulitplier of 1.1, which gives a total ET of .29 inches per day. Water holding capacity of sandloam soil is 1 inch of water per one foot of soil depth. How you apply all of this to the desert canyons is up for discussion.I would guess that the vegetation thickets in the canyons would be similar to corn in their ET.Temperature could easily double the ET rate and wind with heat could double it again. Your water holding capacity of the canyon floor should be similar to a sand loam. Anyways just a little food for thought from a desert loving farmer.


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