Ground conditions · Saturated Sand
Saturated Sand — The Default Florida Problem
The most common condition across coastal Florida: clean permeable sand with the water table a few feet down. It excavates easily and it will not stand up wet.
Send the geotechnical report and the site plan. You get a written read on the water, the excavation and the risk.
Self-perform
Dewatering and support of excavation, in house
Tidal
Deep foundations in tidal environments
Licensed
General contractor, licensed in the state of Florida
Water
The variable that decides the schedule in Florida
High permeability cuts both ways
Sand drains quickly, which makes drawdown achievable. It also means the flow rate is high, so the system has to move a lot of water continuously, and the discharge route matters as much as the pumps. Turn the system off and the table returns in hours, taking the subgrade with it.
What it rules in and out
- Wellpoints work well and deploy quickly — usually the first option.
- Auger cast piles suit it, because the auger supports the bore.
- Sheet piling drives easily and gives a useful cut-off.
- Open-cut without support fails quickly below the table.
- Discharge volume, not drawdown, is usually the binding constraint.
How we handle it
- 01Model the flow rate, not just the depth of drawdown.
- 02Secure the discharge route and permit early.
- 03Plan for continuous running, including out of hours.
- 04Watch adjacent structures for settlement from drawdown.
The failure most often seen is a system sized for the drawdown but not for the volume, which runs fine on day one and cannot keep up once excavation opens the full area. Size for the area you will eventually have open.
FAQ
Common questions
- Can we turn the pumps off at night?
- Generally no. The table returns in hours and the subgrade goes with it.
- Is sand good or bad to work in?
- Good, once dewatered. Very bad wet — it will not stand at all.
- What usually limits the system?
- Discharge volume and where it can legally go, rather than the drawdown itself.
- Does it settle neighbors?
- It can. Drawdown over a wide area is the mechanism, which is why monitoring matters.
Capabilities
Construction Dewatering
In most of coastal Florida the groundwater sits a few feet below grade. Any excavation deeper than that is an excavation in water until something is done about it, and what gets done determines the program.
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Support of Excavation
Support of excavation is the system that keeps the hole open and keeps the ground next to it from moving. On a tight urban site it is the whole job.
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Sheet Piling
Interlocking steel sheets driven or vibrated into the ground, giving retention and a groundwater cut-off in one system. In saturated Florida sand that combination is often exactly what the job needs.
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Secant & Slurry Walls
Overlapping drilled piles, or a trench supported by slurry and filled with concrete, forming a structural wall that also cuts off groundwater. The answer where sheets will not go.
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Auger Cast Piles
A continuous flight auger is drilled to depth and grout is pumped through the stem as it withdraws. The soil is never left unsupported, which is why the method suits saturated Florida sand.
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Helical Piles
Steel shafts with helical plates, screwed into the ground with equipment small enough to work inside a building. Capacity is verified by installation torque and the pile can be loaded immediately.
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More ground conditions
Coquina & Cap Rock
Cemented shell and limestone layers turn up across Florida at unpredictable depths, and they are the reason a method chosen from experience rather than borings goes wrong.
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Organic Muck & Peat
Organic soils turn up across inland and former wetland Florida. They compress under load, keep compressing for years, and cannot be improved by compaction.
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Tidal & Waterfront Sites
Near the Intracoastal and the coast, the groundwater is tidally connected. It rises and falls twice a day, and a dewatering system designed for a static table will fail on the flood.
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Next step
Find out what is actually wrong with it.
An inspection, photographs of what we found, and a written scope. If the honest answer is that it can wait another season, that is the answer you will get.