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assistance with making swale calculations

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I have a project going. this thread is linked to this project


So I got some heavy clay soil on site. The wettest year on record was 1940-41 with about 32 inches of rain. there was one year that 3 inches of water fell in a day.  there is about a 6.25 percent grade across 289 feet. in some places it is a little bit steeper.

I am trying to think of more information that I need to take into consideration before the build.
Filename: SanMartinrecordrainfallyears.pdf
File size: 53 Kbytes
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Location: Cache Valley, zone 4b, Irrigated, 9" rain in badlands.
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Spillways. Lots and lots of spillways... And much bigger and more robust than you can imagine.
Uh oh, we're definitely being carded. Here, show him this tiny ad:
Switching from electric heat to a rocket mass heater reduces your carbon footprint as much as parking 7 cars
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