It is always difficult to offer any advice on these types of situations because we can't really see your site.
If the water is coming from a specific location, i.e. hillside, or rooftop, you could dig a ditch to the lower areas of the site.
Additionally, if the water is getting into your building, you could build up around the building with the balance from above.
It sounds to me like you have some digging, though.
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