Drain and subsoil solutions
I'm currently restoring an old cellar in Italy, house is about 200 years old and still structurally fine according to engineers even though there's not much of a foundation, stones laid directly on hard marl, grade is about in the middle of the stone part in this corner or about 150cm/5ft above floor.
During the rainy half of the year I get about a liter a day of water pooling down which isn't much of an issue, previous owners rendered everything with cement and made a cement mound to act like a drainage channel and it kind of worked besides the trapped water.
I'm restoring it to be a commercial cellar and can't have exposed soil or standing water, thinking about cutting the channel open to put a proper drain and covering the soil with some sort of breatheable render but I'm not getting any good suggestions from surveyors/builders so I'd be very grateful for any suggestions.
Not looking to put any modern or intensive solutions as the building currently is structurally sound and works for its intended use, just trying to divert the water, cover the subsoil and not cause any new problems.
Thanks in advance