I can sympathize with you. Since moving into this present house I've discovered a couple areas with water problems. The previous owners had their downspouts too close to the house so everytime it rained it came into the basement along one wall where I had my shelves of quilting cottons. Once I got that fixed then one of my pipes burst overhead of my dress fabrics and notebooks full of projects. The books were toast so I tossed them, dried all the fabrics. Was fortunate that only one fabric bled onto another fabric, a burgundy red crepe wool onto a peach colored linen. What a mess. Got that fixed and then discovered a pin hole leak coming thru the side wall. Sprayed a substance onto to stop that leak as well as onto some of the floor as it seems to be seeping up from the floor too. Old house so I'm sure they never put some sort of water proof sheeting down before pouring the concrete. Floor kept crumbling in some areas. Anyway, I'm dry now this season.
Nice large area you have though.