Underground detention and stormwater control measures (SCMs) for tight sites, parking lots and developments.
Subsurface stormwater control measures in San Antonio do their work out of sight, which is exactly why they get forgotten until a parking lot starts holding water or a county inspector asks for maintenance records. Chambers, vaults and buried pipe systems handle the runoff that used to go to an open pond, and they are common now on tight infill lots in Alamo Heights as well as the newer commercial pads going up around Stone Oak and Shavano Park. Underground does not mean maintenance-free. It means the problems are harder to see until they are expensive.
Bexar County ground is the complicating factor. Caliche and limestone shelves sit close to the surface across much of the city, so excavated systems often have less soil buffer than the plans assumed, and infiltration rates can be slower than the system was designed around. Add in the pattern of long dry stretches followed by heavy rain, and sediment that would normally wash through a system instead bakes into inlets and chamber rows. On older in-town properties we find collapsed or root-bound pipe runs. On newer Stone Oak sites built over cut limestone, the more common issue is a system that drains slower than it should, with standing water in a vault or lot ponding longer than it used to.
For a property manager or board member, working with us on this scope starts with getting someone on the ground who has opened these systems before. We walk the site, locate access points, and tell you plainly what is sediment, what is structural, and what is just overdue cleaning. From there we handle inspection, jetting, retrofits, or new installation alongside your engineer's plan, and we schedule around your tenants and your traffic, not the other way around.
We're a local, family-built company that treats your San Antonio property like our own, tidy crews, clear pricing, and subsurface stormwater control measures that holds up to Bexar County conditions. Available as a one-time project or part of an ongoing plan.
A subsurface stormwater control measure is used when there isn't room for a surface pond, tight commercial lots, parking areas and dense developments. The system goes underground (chambers, vaults or pipe galleries) and stores or infiltrates stormwater beneath the site, freeing up the surface for parking or building.
Yes. Subsurface SCMs accumulate sediment and debris and must be inspected, cleaned and jetted on a schedule to keep working and stay compliant. We service, clean and retrofit underground detention and infiltration systems throughout Central Texas.
We schedule a free on-site visit, usually within 48 hours of your call, and locate every access point, manhole and cleanout tied to the system. We check drawdown, look for sediment buildup at inlets, and note any structural issues in chambers or vaults. You get a straightforward rundown of what we found and what it would take to fix it, no obligation to move forward.
Most commercial systems here need inspection and cleaning on an annual basis at minimum, more often if the site has a lot of tree cover, loose paving nearby, or a history of slow drawdown. Heavy rain events after a dry stretch tend to push more sediment into the system at once, so a site that performed fine for years can suddenly need jetting after one bad storm season.
We stage equipment to use the minimum number of parking spaces and coordinate timing with property management ahead of the work so tenants and residents get notice. Most inspection, cleaning and jetting work can be done without closing a lot entirely, and we work sections at a time on larger parking areas so traffic flow continues.
It means less give in the ground than the original design may have assumed. Caliche and shallow limestone shelves slow infiltration, so systems can hold water longer than expected, and excavation for retrofits often takes longer because of rock close to the surface. We factor this into both the diagnosis and the timeline when we scope the work.
Access is usually the biggest factor, since a vault buried under mature landscaping or a parking lot that cannot be fully closed takes more time than one with clear access. Beyond that, the amount of sediment, whether pipe or chamber sections need replacement rather than cleaning, and whether we are retrofitting an older system versus maintaining a newer one all affect the final number.
Free, no-pressure estimate from a local crew. Call (737) 404-9343 or request a quote online.
