01
Subgrade & Excavation
Basin footprint cut to engineered grade with GPS-controlled dozers and excavators. Side slopes dressed, subgrade scarified for media bond, and over-excavation rebuilt with structural fill where required.
Bioretention BasinsStormwater BMPs
Stormwater BMPs
built to MSD spec.
Full-scope bioretention basin construction across the St. Louis region — from subdivision-scale rain gardens to multi-acre regional facilities for MSD Project Clear. Excavation, underdrains, engineered media, weirs, and native planting under one crew.
Why BioretentionThe BMP at the
The BMP at the
heart of Project Clear.
Bioretention basins capture the first flush of stormwater, filter it through engineered soil media, and release clean, slowed flow back to the storm sewer or receiving stream. They are the most cost-effective on-site treatment BMP in MSD's Project Clear toolkit — and one of the most demanding to build correctly.
The basin only works when the subgrade is right, the underdrains are bedded properly, the media meets the gradation spec, and the outlet structure is set to the elevation on the plans. Get any of those wrong and the basin either ponds, scours, or fails acceptance.
Our Construction ProcessSix phases —
Six phases —
all self-performed.
02
Underdrain & Outlet Structure
Perforated PVC underdrains bedded in #57 washed stone, wrapped in non-woven geotextile, and tied into the outlet control structure. Cleanouts brought to finished grade for long-term maintenance access.
03
Engineered Bioretention Soil Media
Sand-compost-topsoil blend mixed to MSD's BSM gradation spec, placed in 12-inch lifts, and infiltration-tested in-place before final grading. We track media sources and provide gradation reports at closeout.
04
Inlets, Weirs & Energy Dissipation
Stone forebays, level spreaders, riprap aprons, and concrete weirs set to design elevation. First-flush flow is treated; larger storms bypass cleanly without scouring the planting bed.
05
Native Planting & Stabilization
Coordinated planting of native plugs, hardwood mulch installation, and erosion control blanket where slopes require it. We work directly with the landscape architect or self-perform when scoped in.
06
As-Built & Owner Handoff
GPS as-built of basin contours, underdrain runs, and structure inverts. Maintenance plan and inspection log delivered for MSD acceptance — the package the inspector actually wants to see.
Why KueselThe contractor MSD
The contractor MSD
engineers trust.
MSD Project Clear experience
We've built bioretention BMPs across the St. Louis metro for municipalities, developers, and engineers writing toward MSD's Project Clear compliance milestones.
Self-performed earthwork & utilities
Excavation, underdrain, structures, and stabilization are all in-house. No subcontractor handoff delays — the basin is built by one crew on one schedule.
Media sourcing & QC
We source bioretention soil media from suppliers who match the MSD BSM spec and document gradation. Infiltration rates are verified before the basin goes into service.
Built for the next 30 years
Underdrains bedded right, structures poured to engineer detail, and stabilization that holds through the first wet season. We build basins that pass acceptance and stay functional.