What's the best way to deal with the floor of a shed with water infiltration?
I would start by digging a trench and filling with gravel / small stones to direct the water away as much as possible.
Did that at the back of my property - started at 6&quot; deep and went to 12&quot; as it needs a small slope. directed the water into an existing drain and it worked a treat. Only took 2 afternoons of digging and measuring the slope.
Edit: if the property is the lowest part of the surrounding land then another possibility is to dig a soakaway to help the drainage. Any method of reducing the amount of water to deal with at the building will help.