Drain Installation & Design of Drainage System

Drainage Tile / Underdrain / French Drain

When should it be used?

Whether it is new construction or re-construction of a parking lot, drainage above and below the surface is a top priority.  The goal of a well constructed drainage system is to collect and divert large amounts of runoff.

Adrainsystem-installation parking lot in a low lying area is the main candidate for drain tile installation.  If a parking lot is surrounded by areas of higher elevation, e.g. a hill, the perimeter of the parking lot should be lined with drain tile so the natural ground water flow can be caught before entering the sub base of the parking lot.

Soil types are another reason drain tile should be used.  If the sub base is made up of a clay mixture, it is likely to hold more moisture than a soil type with finer gradation.  Drain tile may be placed in the swale (area of surface water flow) of a parking lot to help dry out the surrounding soils.

When water seepage is apparent, is another reason to install drain tile.  If the surface of the asphalt, in a reconstruction project, displays moisture on a dry day, it likely that the sub base is saturated and needs to be dried out.

Minimizing undercuts is another reason to add drain tile.  If it is known that the sub base is saturated, due to water seepage or geological data, it may be suggested to install drain tile and let it sit for a period of time.  This would be done to help dry out a parking lot area where undercuts are suspected, thus minimizing costs.

Protecting an investment is another reason to install drain tile.  If there is room in the budget, drain tile should be placed along the perimeter of a parking lot, especially under curb & gutter and along green space.  This practice is an effective way to safeguard against future water infiltration to the sub base of the parking lot.

Basin and Sewer Services

Types of Drainage Systems:

drainsystem-installation2Standard Catch Basins: Catch basins are typically the first point in a parking lot to fail. In order to repair or replace a compromised drainage basin the steel lid & frame, concrete rings, and/or concrete cone may need to be replaced. Once the failed asphalt has been removed either new rings or a cone is installed and sealed with mastic and/or hydraulic cement. Mastic or hydraulic cement will eliminate any unwanted openings in the drainage basin. The area surrounding the basin is then backfilled with gravel and paved.

Concrete Incased Drainage Basins: A concrete square can be poured around the drainage basin instead of installing asphalt. The installation of a concrete square around the catch basin provides a much more durable alternative when compared to asphalt.

Trench Drainage Basins: Are shallow basin drainage systems which run over a long distance. Typical dimensions: 1’ to 1.5’ depth, 8” to 16” width, and 8’ to 50’ long. Trench drains are designed to collect and divert water at a low point such as dumpster areas, loading docks, or entrance/exit points of a parking lot.

French Drains: Are required when moisture collects in the sub-base layer of the parking lot. When water collects in the sub base layer the structural integrity of the parking lot begins to fail and pot holes develop. The most effective way to collect and divert this moisture is by installing a french drain. A trench is dug between 24.00” and 48.00” deep. Washed stone is installed at the base of the trench.

A 4.00” to 6.00” perforated pipe covered with sock material is placed on top the wash stone and tied into the nearest drainage basin. The trench is filled with washed stone and covered with CA-6 gravel. The area is repaved. The french drain system is an ideal way to collect sub base moisture and improve the stability of the parking lot.

Additional Catch Basins: In many cases, parking lots are built with no drainage system or not enough drainage basins. We have the ability to install additional catch basins or an entire drainage system if one does not exist.

Please contact us for free Florida drainage installation quotes and catch basin and sewer estimates:  Naples/Ft. Myers (239) 465-2325 | Ft. Lauderdale (954) 294-1810

Serving the entire state of Florida and surrounding states, Alabama and Georgia.

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