Retaining Walls and Drainage in Northeast Ohio

Most of the yards we work in sit on glacial till, a dense clay and silt mix the glaciers left behind. It drains slowly. The USDA soil survey for Mahoning silt loam, one of the most widespread soils on Northeast Ohio's till plains, describes a perched water table 6 to 12 inches below the surface for much of the year, from fall through spring. In plain terms, the ground is often saturated right under the grass.

Saturated clay is heavy, it pushes hard on anything holding it back and it expands when it freezes. Think of the usual backyard problems: a leaning wall, a patio that has sunk on one side, a wet basement next to a new deck, a pool area that floods after every storm. Trace them back and you usually find water that had nowhere to go.

So we treat grading and drainage as the foundation of everything else in the yard. Get the water right and walls, patios and pools last. Get it wrong and nothing built on top will hold up for long.

A retaining wall holds back soil so you can have level ground on a slope. In a pool yard that often means cutting the pool into a hillside with a wall behind it, or building up a low side to make a flat deck. On its own, a wall can turn a steep, unusable bank into a terrace for a patio, a garden or a lawn you can actually mow.

The wall you see is only part of it. Behind it, and below it, is where the work is:

• A trench dug to firm soil with a compacted stone base, so the wall starts level and stays that way.
• Drainage stone behind the wall and a perforated drain pipe at the base, carried to a place where the water can leave the yard.
• Backfill placed and compacted in layers, not dumped in all at once.
• For taller walls, reinforcement tying the wall back into the soil behind it, as the design requires.

The drainage behind the wall is the easiest step to skimp on, and in wet clay it is the one that matters most. Water that builds up behind a wall adds pressure the wall was never built for, and when it freezes it pushes harder still.

Ohio's residential building code draws a clear line. Under Section 404.4 of the Residential Code of Ohio, a retaining wall that is not supported at the top and holds back more than 48 inches of unbalanced fill must be designed using accepted engineering practice, so it stays stable against overturning, sliding, excess foundation pressure and water uplift. So must any wall over 24 inches tall that carries extra loads beyond the soil, such as a driveway, a fence or a structure sitting above it.

In a pool yard, that second rule comes up more than people expect, because a fence along the top of a wall or a patio sitting close to its edge counts as extra load. Local building departments can also add their own permit requirements for walls. We check the rules for your town, bring in engineering where the wall needs it and handle the permits.

A pool changes how a yard drains. It puts a large hard edge and a deck where there used to be lawn, and every square foot of deck sends rain somewhere. On a sloped lot the pool may sit partly in a cut and partly on fill, with a wall on the high side holding the hill back and the low side built up. Both sides need drainage planned around them, or the uphill water ends up running across the deck and into the pool.

We design the pool, the deck, any walls and the drainage together in the same 3D model. That is also where we work out the barrier fence. A fence on top of a wall is an extra load the wall has to be designed for, and the fence posts have to be set so they do not undermine the wall. Settling those questions on the drawing is far cheaper than settling them with a jackhammer.

Grading is shaping the ground so water runs where you want it. For a house, the Residential Code of Ohio sets a baseline in Section 401.3: the ground should fall at least 6 inches within the first 10 feet away from the foundation, and where lot lines or other barriers make that impossible, drains or swales have to carry the water away instead. We apply the same thinking to pools and patios. The deck should shed water away from the pool, the yard should shed water away from the deck and the house, and the whole lot should drain to a place where the water can leave without landing on a neighbor.

We use grading to fix existing problems too. A low spot where water sits for days, a yard that slopes toward the house, a swale that got filled in by a previous owner: these are often simpler to fix with the right grade than with more pipe.

When grading alone will not do it, the answer is drainage below or along the surface. The common tools are:

• Swales, shallow channels shaped into the lawn to carry surface water around a house, patio or pool.
• Surface drains and catch basins in low spots or at the edge of a patio, piped to a discharge point.
• Perforated drains in gravel trenches, which collect water from saturated soil below the surface.
• Downspout extensions carried underground, so roof water ends up well away from the foundation and the pool.

The harder decision is where the water goes. It needs somewhere legal and practical to end up, whether that is a storm sewer connection, a ditch or a spot on your own lot that can take it. We work that out during the design, not after the trench is dug.

Bare soil on a slope washes away in the first heavy rain. Any time we disturb a yard, and especially on slopes, we control erosion while the work is going on and until the ground is stable again. That can mean silt fencing, temporary cover on bare soil, stabilizing the slope with plantings, or a wall where the grade is too steep to hold on its own.

On bigger projects, site development ties it all together: clearing, rough grading, cutting and filling to make level areas, moving the spoil from a pool dig, running utilities and setting the final grade. We do this work ourselves, which means the crew digging the pool is the same crew shaping the yard around it.

Any project that involves digging, from a wall footing to a drain trench, starts with a call to Ohio811. Under the Ohio dig law as rewritten by House Bill 227 (effective June 9, 2026), the excavator notifies OHIO811 at least two working days before digging and no more than 16 calendar days ahead, so utilities can mark their lines. We handle that on every job.

Retaining wall, grading and drainage projects start at about $15,000. The price depends on the height and length of any wall, the material, whether it needs engineering, how much soil has to move, how far the water has to be carried and how easy it is to get equipment into the yard. When this work is part of a pool project, doing it all at once saves a second round of mobilizing equipment and tearing up the yard. We give you a written price after the site visit, and financing is available through our lending partners.

Todd Stump, our owner, has more than 13 years in high-end construction, including complex structural projects, and the crew includes people with construction and landscaping backgrounds. Ohio State Pools is veteran owned and operated.