Hydroponic Peas in Rain Gutters?

[piperjim]

Here's my idea. I have a place in my garden where I can easily fix up some rain gutters to grow what I hope will be peas in the spring and beans in the summer.
I already have other systems, 20 bato buckets for tomatoes, 11 bottle for my herbs (posted in the systems forum) a vertical system similar to the one below, and an ebb/flow system for what I don't know yet.

The question I have is, would a rain gutter system for peas lose too much water to evaporation? I live in Utah so it is pretty arid here, but I'm thinking that a rain gutter would allow me to plant quite a lot. Is there a better way to grow peas for home use?
Thanks for your advice!