In Eugene, a permeable resin-bound surface may be accepted as permeable pavement under the City's 2025 Stormwater Management Manual, which classes permeable pavements as an impervious area reduction technique. The manual's list of permeable pavements does not name resin-bound, so the reviewer decides. If it is accepted and built over a layered permeable base, it replaces impervious area one for one and shrinks the stormwater quality facility a project needs.

The catch is the ground. Much of Eugene's valley floor holds heavy, slow-draining soils and high winter water, and the manual's Infiltration Limited Areas Map flags where infiltration is unlikely to work. On those sites the stone reservoir under the surface needs drain pipes, and the design has to be honest about what it achieves.

Eugene Code, the 2025 manual and where permeable pavement counts

Eugene holds a Phase I municipal stormwater permit from the Oregon Department of Environmental Quality, renewed on September 15, 2021, and applies it through Eugene Code sections 9.6790 to 9.6797 and the 2025 Stormwater Management Manual. Under EC 9.6792, development and redevelopment that proposes 1,000 square feet or more of new or replaced impervious surface must treat that runoff on site before it reaches the flood control system.

The code sets a priority order for treatment: infiltration first, then extended filtration, then off-site options. Flood control, flow control for headwater streams, oil control and source controls are separate requirements that may also apply.

Permeable pavement sits alongside ecoroofs, contained planters and tree credits as an impervious area reduction technique. The manual describes it as a permeable wearing course on layered permeable base materials over a stone reservoir that infiltrates or drains to underlying pipes. It may not receive runoff from other paved areas, and it must be installed and maintained to the manufacturer's specifications.

Willamette Valley clay, winter groundwater and hillside limits

The manual treats a site as unsuitable for infiltration for water quality where tested rates are below 2 inches per hour, bedrock is within 5 feet of the surface, groundwater is within 6 feet, or slopes exceed 10 percent. That screen catches a lot of Eugene: heavy clays in west Eugene near Amazon Creek and the wetlands, seasonally high water in the flats, and steep lots in the South Hills.

For the project engineer, that usually means a permeable resin-bound section with an underdrain, credited for reducing impervious area rather than as a full infiltration facility. The Infiltration Limited Areas Map is only a citywide screen, so any infiltration credit needs site testing by one of the City's presumptive methods (open pit falling head, encased falling head or double ring infiltrometer). Testing can also show that infiltration works on a site inside a mapped limited area. Long, wet winters keep fine sediment moving, so the maintenance plan should cover regular cleaning. A resin layer over an existing slab is not permeable pavement under the manual, because the water never reaches a stone reservoir.

Where it fits around Eugene

Courtyards and walkways at student and multifamily housing near the University of Oregon and in the Whiteaker.
Plazas and patios in downtown redevelopment where space for rain gardens is tight.
Customer parking and frontages at commercial and light industrial sites in west Eugene, designed with underdrains on clay. The manual does not allow permeable pavement at auto repair and sales lots, impound yards or fast food sites.
Patios and paths at homes, kept clear of runoff from roofs and driveways.

Sites in the Special Flood Control Area that drain to the Junction City Water Control District's system may also need detention. Check the code map early in design.

Getting a permeable section through Eugene Public Works review

Size the area with the City's Simplified or Presumptive approach, show it on the stormwater plan with base layers, underdrain and overflow, and file the operation and maintenance plan. Eugene Public Works Engineering reviews stormwater for land use and building permits.

Resin Rock manufactures and supplies, and does not install. We provide UV-stable binder, natural stone aggregates, trims and the Rock Crete permeable sub-base, plus the manufacturer's specifications the manual expects, through our technical data sheets. Oregon contractors can join our installer training, and owners can ask us for an approved installer, usually matched within 24 hours.

Before you specify permeable resin-bound in Eugene

Confirm whether the project proposes 1,000 square feet or more of new or replaced impervious surface.
Check the Infiltration Limited Areas Map and NRCS soil group map in the manual's Appendix I.
Plan infiltration testing by one of the City's presumptive methods if you want infiltration credit.
Keep the permeable area from receiving runoff from roofs or other paving.
Include an underdrain where clay, groundwater or slope limits infiltration.
Follow the manufacturer's installation and maintenance specifications.

Common questions about permeable resin-bound in Eugene

Does a permeable resin-bound patio reduce my stormwater requirement in Eugene?

It can, if the City accepts it as permeable pavement. The 2025 manual treats permeable pavement as an impervious area reduction technique that replaces impervious area at a 1:1 ratio, which reduces the size of the stormwater quality facility you need. Resin-bound is not named in the manual, so confirm acceptance with reviewers. The area must sit on layered permeable base materials and cannot take runoff from other impervious surfaces.

My lot in west Eugene is heavy clay. Is permeable pavement pointless?

Not pointless, but it will not infiltrate much. The manual treats sites with infiltration rates under 2 inches per hour, or groundwater within 6 feet, as unsuitable for infiltration for water quality. The usual answer is a stone reservoir with drain pipes, credited as impervious area reduction rather than as an infiltration facility.

Can resin-bound go over my existing concrete driveway?

It can be laid as a decorative finish, but it would not be permeable pavement under the manual. Water passes through the resin and runs off the concrete, never reaching a stone reservoir. To count, remove the slab, build the manual's layered base with an open-graded stone layer at least 6 inches deep, and follow the manufacturer's specifications. Ask reviewers whether a product base such as Rock Crete can be part of that section.

Official sources for Eugene

Local rules change. We last checked these sources in October 2026. Confirm current requirements with the reviewing agency before you design, and treat this page as a starting point, not engineering or permitting advice.

Permeable Resin-Bound Surfacing in Eugene, OR