BREVARD COUNTY MULTI-METHOD
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WHAT METHOD IS BEST ?
- Holland Pump Orlando Branch Project
- Pump Consultant – Greg C.
- Scope: dewater multiple areas, so the developer can raise the section of land that will be developed for the commercial building and parking
WHEN DESIGNING A DEWATERING PLAN
- Know what the scope of the project is.
- Walk the site, and see what and if any structures could be influenced by dewatering.
- Know what the depth of the excavation is.
- If there are multiple stages, know the depth of each one.
- Review the geotechnical report with soil borings and water table information.
- Are there any contaminants to worry about in the soil?
- Where is the identified discharge point and how far away is it form the pump location and system you are designing?
- Review the permit to see how many gallons per minute will be allowed into the discharge point if there is a restriction.
- Access which dewatering method(s), system(s), pumps(s), and equipment would be best accomplish the scope of work.
PHASE 1:
- Installed a 6″ hydraulically driven submersible pump system, so they can begin to transfer the dirt to raise the site for the building and parking area.
WHAT IS WELLPOINT DEWATERING?
A Wellpoint Dewatering system is a versatile, cost-effective pre-drainage solution that features individual wellpoints which are closely spaced around the excavation.
This technique utilizes vacuum to assist in lowering groundwater levels to create a stable, dry working environment. Wellpoints are especially suited to shallower excavations or excavations taking place in fine-grained soils.
Wellpoint systems consist of a series of small-diameter wellpoints installed at a pre-determined depth (usually 23ft deep or less) on relatively close centers.
PHASE 2:
- The site developer needs to build a ramp for excavators and dump trucks to drive on to continue to dig out the excavation.
- Challenge: the ramp needs to be firm and dry to handle heavy equipment driving on it.
- Installed a wellpoint system with a 12″ Rotary Lobe Wellpoint Pump around the perimeter of the ramp to allow the sand to be built up for the ramp and not washed away or undermined.
- The excavation will be used as a pond and rain run off once the project is completed.