Excavation and removal of built-up sediment to restore a detention pond's designed storage, drainage performance and access.
On most Bexar County basins, the forebay is the first thing to fill in, usually within a few seasons of a new Stone Oak development coming online, long before anyone notices the main pool losing capacity. Detention pond sediment removal in San Antonio addresses that buildup before it backs up into the storm drain network it was built to protect.
Caliche-heavy soils do not infiltrate the way engineers hope on paper, so basins here rely more on stored volume than on the ground soaking anything up, and that volume disappears fast once sediment starts stacking against the outlet structure. A hard rain off a limestone shelf moves a lot of fines in a short burst, and those fines settle out in the first quiet water they reach. We see slow drawdown after storms, cattails and volunteer trees taking hold on silted shelves, and outlet pipes choked down to a trickle on properties from Alamo Heights in-town lots to newer Shavano Park sites. Bare, eroding side slopes usually mean the grading has already shifted from what the plans called for.
Working with Corral Bros on this scope starts with a site walk and a straightforward look at how much material has built up and where. We excavate and haul it off, bring the basin back to its design grade, clear the forebay and outlet, and hand the property back to whoever is responsible for it in working order. HOA boards, property managers, and GCs closing out a site get a crew that has cleaned a lot of these basins and knows what caliche and limestone do to them over time.
We're a local, family-built company that treats your San Antonio property like our own, tidy crews, clear pricing, and detention pond sediment removal that holds up to Bexar County conditions. Available as a one-time project or part of an ongoing plan.
We schedule a free on-site visit, usually within 48 hours of your call, and walk the basin with you or your maintenance contact. We check sediment depth at the forebay, main pool, and outlet, look at slope condition, and note anything blocking the structure. You get a clear picture of scope before any excavation starts, with no obligation to move forward.
It depends on the watershed above it, but many Bexar County basins need attention every few years, sooner if the drainage area includes a lot of exposed caliche or a newer development still stabilizing. Triggers we commonly see are standing water that will not draw down, visible silt deltas at the forebay, or an outlet pipe running slower than it used to after storms.
We stage equipment and haul routes to avoid blocking active parking areas and tenant access, and we coordinate timing with property management or the HOA board ahead of the work. Apartment and retail center schedules get particular attention since drive lanes and resident spaces usually cannot be closed for long.
Caliche and limestone shelves do not break down the way softer soils do, so excavation often moves slower and sediment can be denser than it looks from the bank. San Antonio's pattern of long dry stretches followed by heavy rain events also means a lot of sediment arrives in a few big pushes rather than gradually, which is why basins here can look fine one season and be half full the next.
The main factors are how much sediment has to come out, how far it has to travel to reach a haul route, and whether the forebay and outlet structure need extra attention beyond standard cleanout. Site access matters too. A Stone Oak basin with a clear approach costs less to work than an older Alamo Heights property with tight access and mature trees on the embankment.
Free, no-pressure estimate from a local crew. Call (737) 404-9343 or request a quote online.
