Might be a bit larger scale agricultural but some good theoretical info here.....

https://www.teagasc.ie/media/website/environment/soil/Teagasc_Drainage_Manual_2022.pdf

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Checking it out man, cheers .

Using hand tools: I'd look at digging swales higher up in the watershed, above the area you'd like to dry out. If you have access.

#work