Storm & Flood Damage Recovery in Highland, NY

That is the shape of the problem on a sloping lot over shallow rock. Water infiltrates a short distance, meets shale it cannot pass through, and travels downhill along the top of the rock until something interrupts it, which is usually the uphill wall of a basement. Interception uphill of the foundation, with a drain that discharges to daylight, addresses it at the source. Interior sealing on that wall does not, because the pressure remains.

Because the autumn peak here is driven by tropical remnants rather than by ordinary rainfall. Those systems deliver in a day what the area would normally get in a month, and shallow soil over rock has nowhere near enough storage to absorb it. The rest of the year's rain is comfortably within the ground's capacity. So the drainage design that matters is the one that works during a single large event, not the average one.

Where the terrain allows it, yes, and on a sloping lot it often does. A gravity drain to daylight has no pump to fail, no power dependency, and no maintenance beyond keeping the outlet clear. A sump is the fallback for flat sites or where there is nowhere lower to discharge. Given a choice on a hillside property, the gravity option is more reliable in exactly the conditions when it is needed most.