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southern MN | Yup.
Some version of angled, 45 degrees to the hillside, is often the best compromise to making tile grade and catching the underground flows.
Here the clay layers catch water and create springs in the shallow hills. If you go straight up the hills, you might miss some of those clay subsoils channels and they will still bleed out to surface between the laterals.
Going across or at an angle will be much more apt to catch the underground water flow.
It's hard to have a generic plan that really fits much actual practice easily; there is a lot of art to designing a tile system. You have to account for soil layers, contour, issues like groves or roads that affect snowmelt and runoff, and so on. Then often one has to compromise a bit to fit the water into a given main.
Paul | |
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website that explains pattern tile plans.
