Installation of a corrugated metal pipe detention system.

Reclaiming Space and Value with Underground Stormwater Design

As land prices rise and project footprints shrink, developers and engineers are forced to rethink traditional stormwater management. Gone are the days when an open detention basin in the back corner of the site was the default. The trend is shifting underground, and for good reason. Corrugated metal pipe (CMP) detention and infiltration systems provide a solution that helps maximize usable land, comply with regulations, and reduce long-term maintenance costs.

Maximizing Usable Land:
Every square foot counts, especially in urban infill, commercial, or mixed-use developments. By placing stormwater systems underground, engineers can unlock land that would otherwise be consumed by surface basins. This space can now be used for parking, building expansion, or amenities like playgrounds and walking trails. For landowners, it’s an opportunity to increase revenue; for engineers, it’s a way to deliver more value within tight site constraints.

Meeting Regulations in Tight Spaces:
Modern regulations often demand volume control, infiltration, or water quality treatment. Above-ground options may not be feasible on narrow, oddly shaped, or sloped parcels. CMP systems can be uniquely shapped and laid out to meet stormwater performance goals without disrupting the overall site plan. Whether it’s detention beneath a parking lot or infiltration under a ball field, CMP delivers flexibility that above-ground options can’t match.

Aesthetic and Safety Benefits:
By eliminating open water bodies, underground systems also reduce safety risks and maintenance headaches. No fencing, no signs, no drowning hazards, just usable, buildable, insurable land. That also improves public perception, especially in residential or retail developments.

Lower Lifecycle Costs:
CMP systems, when designed with proper access and pretreatment, require less frequent and less invasive maintenance than vegetated or natural systems. Internal baffles and risers can isolate debris, while separators upstream limit what enters the system. This focused maintenance reduces labor, equipment, and total lifecycle costs.

For engineers and developers, going underground is more than a design decision, it’s a strategic one. By adopting underground CMP systems, you can create more valuable, buildable, and sustainable sites that meet today’s challenges and tomorrow’s expectations.