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| The only time field tile runs is when the soil's porosity has reached its maximum - in other words, when all the voids in the soil are filled, hydro-static pressure forces water to go down into the tile system. This in turn gives the soil profile a chance to absorb more water.
If the tile wasn't there, the soil, at its maximum porosity, would have no chance to absorb the water, and the water would have to go somewhere on the surface. That is when erosion happens, when water is forced to find an overland flow route to a low point.
I do understand your comment, and in urban subdivision development, water balance is a key concern (this is a whole new topic). However, because agriculture is all soil with a high absorption co-efficient, any water balance concerns are negligible, and are offset by concerns regarding sheet erosion caused by water overland flow routes. | |
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Always a nice sight to see afer installing tile!
