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Yet another conversation on swales

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I know there are a lot of conversations in relation to swale building and im working my way through them. I may just not have enough base knowledge to figure these out my self and Im not sure I can paint a good enough pic to explain what i am trying to figure out.
So on the east side of the yard there is a large pecan that i want to cut back or take out. This yard has a slight grade to it not steep but enough that the neigbor runoff flows like a stream trough the yard taking vaulued top soil with it.
I want to plant a polyculture micro orchard, with plenty of suppot species. But before i begane this project i want to instal on contor swales to harvest water.
SO questions now?
1. I need a walk way though the area parall to the contor. how do i cap the ends of the swale.
2. How do i connect them to slow the occasional streams
3. how tall or wide am i looking for I plan to plant some berrys, pawpaw, pineapple guava, maybe a drawf apple(if i can find a working verity) , and kuamquat
sorry this is a bit unorganized.
4. THe slope goes from north to south so how can i capture the water but still have a bit a solar trap shape?
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Location: Fennville MI
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To point 1, you do not need to "cap" the swales. You dig them nice and level along your contour line, starting at the beginning and ending at the end.

For point 2, you make a spillway. In your situation, I would put spillways at alternating ends. Each swale will gently overflow at its spillway, when it overfills, running downslope to be caught by the next swale.

On point 3, I cannot help, do not have the growing experience to advise you there.

Point 4, I would lay out contour lines and see what they look like. They probably will not be straight, and their shape will influence what you need to do to get your sun trap. I would expect that putting your taller trees to the north would be one element in making a sun trap.
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