Much of Western Washington’s Puget Sound Lowland averages around 37 inches of rain each year. Most of it falls between October and April, when we can see long stretches of wet weather. That’s when your property’s drainage really gets put to the test.
Potholes that keep coming back, corners of the yard that stay soggy long after the rain has stopped, or downspouts that carve the same rut into the soil every winter can all be signs or poor water management throughout your landscape. Fortunately, gravel can improve drainage when you select the right aggregate and proper application method.
Why Does My Gravel Driveway Keep Getting Potholes?
Potholes in gravel driveways are often caused by an issue with your subgrade. When winter rain saturates the base layers, vehicle weight punches through the softened material and forms a pothole. Each car that drives through it and every rainstorm widens and deepens it a little more.
To fix potholes, you’ll need gravel and a dry stretch of weather. Start by clearing loose material from around the hole and digging it out at least two feet in every direction. This will give you firm edges to build on. Next, fill the hole in layers, beginning with 5/8” chips at the bottom and then 5/8” minus on top. Overfill by about an inch to account for compaction, then tamp the layers firmly. Lightly water the area and compact the materials again. If you’re filling multiple potholes, you can top the full driveway with a fresh layer of 5/8” minus once you’re done with all your repairs. This will give the surface a more uniform look.
The reason 5/8” minus works so well for driveway repair is that it contains fines – small particles that fill the gaps between larger rocks. Chips drain well, but they don’t compact as uniformly. Minus allows the surface to lock together into a stable, load-bearing layer that can handle daily vehicle traffic.
How Does a Gravel Walkway Improve Drainage?
A gravel walkway can help manage drainage and erosion while creating a stable path through your yard. It keeps foot traffic out of muddy areas, allows rainwater to drain through instead of pooling, and provides a more durable surface where runoff might otherwise wash away soil.
Walkways don’t have the same demands as your gravel driveway, so the priority is typically comfort, drainage, and appearance rather than load-bearing strength. The base layer is generally the same regardless of the surface materials you choose. Start with 3-4 inches of compacted 5/8″ Minus along the length and width of your path. This creates a stable foundation and helps prevent ruts, soft spots, and areas where water collects.
If you want your path to hold its shape and drain well, a top layer of Sand Hill 5/8” Minus compacts firmly and has a natural, earth-toned color. For a softer, more decorative surface, 3/8” Pea Gravel is smooth underfoot and drains freely. If you’re using pea gravel, you’ll likely want to edge it on both sides to keep it from migrating in wet weather.
How Does a French Drain Work – and Do I Need One?
If you have a low spot in your yard that holds water for days after rain or a corner that’s soggy all through winter, a French drain is usually the right solution. It’s a sloped trench lined with landscape fabric, filled with washed drain rock, and fitted with a perforated pipe at the base. Water enters through the gravel, flows into the pipe, and gets redirected to a drain, dry well, or road that’s well away from the problem area.
Washed drain rock without fines is the recommended material for a French drain. Round, clean aggregate, like Lenz 7/8” or 1-1/2” Washed Drain Rock, keeps the spaces between particles open so water can move freely. If you use material with fines, the particles can compact over time, and the drain will gradually stop working.
What If My Downspouts Are Dumping Water Against My Foundation and Into My Yard?
A downspout that releases against bare soil or a foundation wall is a common drainage problem on residential properties. During each rainstorm, water from your roof is concentrated into only a few locations, and these concentrated flows can lead to erosion, a depression, or water pooling around your structure.
A gravel splash pad is a simple fix. Apply washed drain rock in a 2–3 foot area directly under where the downspout releases water to help absorb the impact and disperse the flow before it erodes the soil surface. A downspout extender that directs water at least four feet away from the foundation can also help prevent water from collecting against your home. If a downspout carries water from a large roof area or discharges a heavy volume of water, a gravel splash pad can connect to a short French drain that carries the water even farther away.
How Do I Fix Wet Areas in the Yard?
Persistent wet areas are usually caused by either water flowing in from somewhere higher on your property or soil that is too compacted to absorb water efficiently. In our area, glacial hardpan made up of dense clay and silt sits 18-36 inches below the soil surface. This layer is highly impermeable, which means drainage stops above it and water accumulates.
For surface wet areas where runoff follows a defined path, a dry riverbed using 2”-4” cobbles can create a natural-looking channel that redirects flow while adding interest to your landscaping. The rounded stones slow the force of the water and allow it to absorb as it flows downward without washing out. For areas where water collects in the soil, a French drain can capture the excess water and redirect it away from the wet area.
How Do I Choose the Right Aggregate For My Drainage Problem?
The right aggregate depends on whether your project needs a stable, compacted surface or an open material that lets water move freely.
Materials with fines (5/8″ Minus, 1-1/4″ Minus, Sand Hill 5/8″ Minus) compact into firm, stable surfaces. Use them for driveways, walkway base layers, and pothole repair. The fines fill gaps between larger particles and allow the surface to behave as a single unit under weight.
Materials without fines (Washed Drain Rock, Pea Gravel, 3/4″ Chips) stay loose and allow water to move freely through them. Use them for French drains, splash pads, planting bed drainage, and anywhere the goal is to disperse water rather than support weight.
Decorative aggregate (Dark 3/4″ Washed Chips, Sand Hill Cobbles, Pea Gravel) can serve both a functional and aesthetic role in borders, dry riverbeds, and garden areas. Color and texture make for an appealing finish layer on a project that has a functional base underneath.
Get Expert Help Choosing Drainage Gravel from Lenz
If you’re not sure which material fits your project, our team at Lenz can help you sort it out. We’ve been supplying aggregate across Northwest Washington for 50 years, and the right materials for drainage projects usually come down to a few key details about the site.
Give us a call at (360) 629-2933 or stop by the yard in Stanwood. Already know which type of gravel you need? Our free Materials Calculator at lenz-enterprises.com can help you estimate quantities before you order.