Construction Dewatering Means and Methods Presentation

Construction Dewatering Getting Your Project on Firm

Ground… …Before It Starts

Topics Of Discussion

• Construction Dewatering • –What is it? • –Why do it? • The Consequences of Improper • Dewatering • Design Considerations • Subsurface Investigations and Soil Borings • Methods of Groundwater Control

Dewatering: What is it?

• Intercepting/minimizing groundwater seepage from

• Entering an excavation. • Depressing the

piezometric water surfaceto a point below the excavation.

Dewatering: Why do it?

Short Term Objectives

• Increase slope stability • Prevent loss of material • Reduce lateral/uplift pressure • Improve the excavation and the

backfill characteristicsof the excavation toallow construction to

• Proceed in a safe manner

Dewatering: Why do it?

Intercept Seepage Long TermObjectives•Reduce or eliminate lateral and/or uplift

pressures •Achieve waterproofing objectives

Improper Dewatering

• The Consequences • Blows, Rendering Excavation Subgrade Unstable • Boils/Piping, the Creation of Voids Rendering Slopes

and Subgrades Unstable • Excavation Support Systems Rendered Unstable • Future Settling• Lost Time• Decreased Worksite Safety

Design Considerations

• Dominant Considerations • Location and Geologic Environment• Size and Depth of Excavation• Groundwater (Piezometric) Leve• Soil & Aquifer Characteristics (Hydraulic Conductivity) • Proposed Excavation Method and Excavation Support • Proposed Schedule • Avoiding Undesirable Side Effects • Proximity to Existing Structures, Potable and/or irrigation

wells.

Dewatering Methods

• Open Pumping• Pre-Drainage -Wellpoints ,Deepwells,Eductors • Methods of cut off• –Soil Bentonite

–Interlocking Steel Sheet Pile–Concrete Caisson

Dewatering Methods

• Dewatering Is the removal of water from solid material or soil by wet classification, centrifugation, filtration, or similar solid-liquid separation processes, such as removal of residual liquid from a filter cake by a filter press as part of various industrial processes.

• On a construction site, this dewatering may be implemented before subsurface excavation for foundations, shoring, or cellar space to lower the water table. This frequently involves the use of submersible "dewatering" pumps, centrifugal ("trash") pumps, eductors, or application of vacuum to wellpoints.

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