Swales on steep hills

Does anyone here have any experience building swales on steep hills? 

We want to plant a home fruit and nut orchard and make it water self-reliant and would like to talk to anyone else who may have already built a system of water collection.  We are considering collecting rain water by building paths with a guttering system that lead to underground mini-storage wells on the upperside of swales holding trees in mulch pits.  Has anyone done this?  Especially on a hill?  (We live in Lyttelton).

 

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