Providing Commercial and Residential Plumbing Services to Delaware and Maryland for over 25 years

We have gained the respect of our customers by applying all the right solutions to their groundwater problems on  
projects both large and small.
Harry Caswell Plumbing Mechanical and Utility Contractor provides a full service solution in dewatering operations.

Dewatering is the process of lowering the ground water table to allow for underground excavations that otherwise
could not take place.

The impact of groundwater on a construction project can be enormous.

Unforeseen groundwater problems can cause major delays and often require drastic redesigns of the project itself.
Groundwater Control or Dewatering

Groundwater control is the temporary reduction of pore pressures or groundwater levels to provide dry, stable and
safe soil conditions in excavations below groundwater level.

Dewatering is used in deep excavations that are required for lift stations, tunnels and other underground structures.

Wellpoint Dewatering

Wellpoint systems are used to lower groundwater levels to provide stable working conditions in excavations.

Wellpoint systems are particularly suited for shallow foundations, utility and trench work dewatering.

A wellpoint system consists of a series of closely spaced small diameter shallow wells.
The wellpoints are connected to a common header pipe and are pumped with a high efficiency vacuum dewatering

Ejector Dewatering

Ejector (or eductor) dewatering systems are used to control pore pressures and to lower groundwater levels to
provide stable working conditions in excavations. Ejector systems are able to extract groundwater and generate
vacuum at the tip of wells and can be installed to depths in excess of 50-feet. Vacuum drainage can dramatically
improve the stability of silty fine sands and laminated silts and clays by controlling excess pore pressures.

Supply pumps at ground level feed high-pressure water to the ejector nozzle and venturi located at the tip of the wells.
The flow of water through the nozzle generates a vacuum in the well and draws in groundwater.

Deep Well Dewatering

Deep well dewatering systems are used to lower groundwater levels to provide stable working conditions in
excavations. A deep well system comprises of an array of drilled or jetted wells, each fitted with an electric
submersible pump.

This technique is particularly suited to deeper excavations or where artesian groundwater pressures threaten base
stability. The system is reliable and the wide spacing of the wells reduces access restrictions to a minimum.
We have over 20 years of experience dewatering in just about every way possible.

From small to large, every dewatering project is handled with the same commitment to giving you superior service.

We offer a “one-stop ground water control shop” with experienced personnel and a wide range of equipment and
24 Hours-7 Days A Week-365 Days a Year
Emergency Plumbing Service
When it comes to your plumbing needs, Harry Caswell Plumbing, Mechanical and Utility Contractor is ready to
    Our Fully Trained and Proficient Emergency Maintenance Engineers are available 24 Hours 7 Days a week,
    365 days a year to attend to your problems promptly and competently.
Areas Serviced

Bethany Beach-Bridgeville-Dewey Beach-Dover-Fenwick Island-Georgetown-Greenwood-
Harrington-Laurel-Lewes-Long Neck-Millsboro-Milton-Milford-Rehoboth Beach-Seaford-Smyrna

Berlin-Delmar-Denton-Easton-Fruitland-Federalsburg-Hurlock-Ocean City-Ocean Pines-Salisbury
302-945-5322    FAX 302-945-7746

32645 Long Neck Rd Millsboro, DE 19966

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