I own a house (Built in 1966) on a shallow hillside, around which recent rain has caused complete ground saturation. On my bottom floor, which is on a concrete slab, the three floor vents were recently filled entirely with clear water. We paid a contractor to remove over 700 gallons because I did not own a pump. Yesterday the same thing happened, so this time I purchased my own pump and removed about 500 gallons. Overnight they filled back up, so it seems the water has moved enough soil to find its way in much faster.
So now I am researching ways to stop this from happening altogether, instead of reactive repairs. I have found two possibles:
Digging a curtain trench uphill of the house to stop groundwater from penetrating the foundations. Then digging french drains downhill to allow groundwater to flow away from the house faster.
Using a product, such as Airseal, to completely seal up the vents.
The first I can probably do myself for under $1,500. The second seems to cost around $2,500 for my size house (2,200 Sq.Ft.).
So I'm looking for advice on where to start. Am I overlooking something? I did purchase some masonry waterproofer to apply around the edges of the house, but have yet to apply it. Is that worth doing?