How to fix driveway drainage problems — before they reach the garage.

First: figure out where the water is coming from

The right fix depends on the source. Stand outside in a rainstorm (or run a hose) and watch: water sheeting down the driveway toward the garage is a slope problem; a downspout discharging at the corner is a roof-water problem; water arriving from a neighbor's yard or a hillside is an interception problem. Each has a different fix, and guessing wrong means paying for a drain that never gets used.

• Water running toward the garage or house → slope and interception
• A downspout emptying onto the pavement → roof-water redirect
• Water arriving from uphill or next door → perimeter collection
• Water sitting in shallow birdbaths → localized low spots in the surface

Fix #1: Correct the surface slope

The cheapest drainage system is gravity. A driveway should fall roughly 1–2% (about 1/8–1/4 inch per foot) away from the garage and toward a planned discharge point — the street, a swale, or a collection basin. If the existing concrete was poured flat or has settled toward the house, no drain will fully compensate; the surface itself has to change. This is exactly what a paver replacement resets: finished elevations are set during design and built into the base, so the new surface sheds water by shape, not by luck.

Fix #2: A channel drain across the driveway

A channel drain (trench drain) is a long grated slot set across the full width of the driveway — typically right at the garage apron or at the low edge before the sidewalk. It intercepts every drop of sheet flow crossing that line and carries it through a solid pipe to a discharge point. In an interlocking paver driveway the channel is set to the finished paver elevation and pavers are cut tight to the grate, so it reads as part of the pattern. Expect a properly installed channel drain with piping and connection to run from the low hundreds per linear foot depending on length, depth, and discharge route — we quote it in the same written proposal as the paving.

• The standard answer to 'water runs into my garage'
• Must be set at the true low line — placement matters more than size
• Needs a legal discharge point; dumping onto a neighbor is not one

Fix #3: Redirect the downspouts

A 1,000 sq ft roof section sheds over 600 gallons in a one-inch storm — if one downspout dumps that at the corner of your driveway, the driveway will pond no matter how it is built. The fix is to tie the downspout into solid (not perforated) pipe and route it under the paver field to a planned discharge point, or to an approved surface location away from foundations. Doing this during a paver installation costs a fraction of trenching through a finished driveway afterward.

Fix #4: Catch basins at the low points

Where water collects at a spot rather than crossing a line — a corner of the driveway, the edge where lawn meets pavement — a catch basin with a flush grate collects it and a solid pipe carries it away. The basin's sump traps sediment so the pipe stays clear, and in a paver surface the grate finishes flush and stays serviceable for cleaning.

Fix #5: Permeable pavers — when the driveway itself drains

Permeable interlocking pavers let rain pass through stone-filled joints into an open-graded gravel reservoir beneath, where it soaks into the soil or exits through an underdrain. Instead of moving runoff somewhere else, the driveway stops producing it. Permeable systems suit flat lots with decent soil and proper setbacks from foundations; on expansive clay or steep hillsides, a conventional surface with channel drains and a captured system is the safer design. Permeable typically adds $3–$8 per square foot over standard installation.

What NOT to do

Three common mistakes make drainage worse. First, dry-laying a 'drain' that discharges onto the sidewalk or a neighbor's lot — in most Southern California cities that is a code violation and a liability. Second, adding a French drain where the problem is surface slope — French drains move water already in the soil; they do not stop sheet flow. Third, sealing or coating a poorly graded slab — the water still has nowhere to go. Fix the geometry first, then add drains where the geometry cannot do the job alone.

Why the paver replacement is the moment to fix it

Every drainage component lives below or within the finished surface. When we replace a driveway, the old slab is demolished, the base is rebuilt to new elevations, and drains, basins, and downspout lines are installed before the pavers conceal them — one mobilization, one warranty. Retrofitting the same drains into a driveway you keep means saw-cutting, trenching, and patching that never quite disappears. With a strong El Niño forecast for winter 2026–27, the homes that planned drainage before the pavers will not be cutting into them after the first big storm.