How can I stop my driveway from flooding every time it rains?

A channel drain won't fix this til you figure out where the water is acutally supposed to discharge. If the roadside ditch is already ponding several inches deep, any gravity drain you run out toward the street is just going to back up immediately. Plus, that jagged crack and sinking slab mean water has already washed out the aggregate subbase underneath your concrete. Your first move has to be stopping the runoff before it ever hits the driveway. An interceptor swale or a shallow trench along the property line between the houses will catch that sheet flow and route it around the carport instead of across it. If you have open ground there, building a recessed **rain garden** packed with deep-rooted native plants will absorb a massive amount of that neighbor runoff before it can ever touch the slab.

Don't write off your local road commission or department of public works just becuase the lot line splits the swale. Road right-of-ways and drainage easements usally extend 10 to 15 feet beyond the edge of the asphalt. If the swale isn't draining, the municipality often has a duty to maintain that flow line so water doesn't undermine the street. Call them up and ask if they can shoot the elevations and regrade the ditch. As for the concrete, don't repour anything until the water diversion is finished. That sunken area is hollow underneath now. Once the ground dries out, you might be able to save it with **polyurethane foam jacking** to lift the slab and stabilize the voids, but if it's shattered into multiple pieces, you'll need to cut out that bay, compact new crushed gravel, and repour. In the meantime, grab a cheap submersible utility pump and a discharge hose to pump that puddle out right after storms so it stops saturating the base.

Seen this a dozen times over the last forty years. Folks today rush to fancy plastic boxes and high-dollar foam, but we used to handle that garden wash by throwing down a simple asphalt roll curb right along the slab edge. Shunts the mud off without digging up your yard. For that sinking slab, look into old-fashioned mudjacking before you let someone sell you on expanding polyurethane. A good mason pumps a thick mix of topsoil, lime, and Portland cement underneath. The heavy slurry packs solid, fills the washouts completly, and holds up forever if you keep the water routed away.

Before you even touch excavation equipment, you need to seal that jagged fracture immediately with an elastomeric polyurethane sealant like Sikaflex-1A or Tremco Vulkem 116, beacuse every time a vehicle traverses that cracked panel, dynamic loading exerts cyclic hydrostatic pressure on the saturated subgrade, wich literally pumps the fine aggregate out from beneath the concrete. Also, if you do end up running subsurface piping, avoid standard corrugated black tubing at all costs and specify smooth-wall perforated SDR 35 PVC wrapped in non-woven geotextile; otherwise, the fine silt washing down from that bordering bed will blind the perforations within two seasons.

Wait, I'm super new to dealing with ground drainage, but if your yard is lower than both neighbors, where whould a swale actualy route the water to? Wouldn't it just get stuck in another low spot in your backyard?

Also curious about that pump idea—do you just hook it up to a regular garden hose and send it down the street? I feel like my neighbors would get pretty mad if I pumped all my driveway swamp water past thier front yards.

Quick update — you guys were spot on about the discharge problem. I went out during rain yesterday and realized the roadside ditch actually sits higher than the carport floor, so gravity drainage would definatly back right up. I'm sealing the crack with polyurethane this weekend, but regarding a catch basin and pump: where can I actually route that water if the ditch is already overflowing?