Horizontal Drain Basin (HDB):
A cure for wet bunkers

Sand traps present a special drainage challenge due to periodic clogging of the perforated drain lines. Removing the accumulated silt has been a time-consuming and costly
process. The ADS Horizontal Drain Basin (HDB) is an effective and economical solution to this problem.
The HDB consists of a 12” high x 16” wide x 48” long polyethylene water receptacle covered by a filtration screen sandwiched between two fiberglass grates. It is installed in the subgrade at the lowest point(s) of the bunker. Drainage pipes are tapped into the sides, and an exit drain is installed at the downstream end. The mesh screen helps to keep silts out of the drain water, and greatly extends the cleaning interval. When rejuvenation is needed, simply uncover the unit, remove the grate, flush out the screen and receptacle,
reassemble and re-cover.

CAMPOS DEPORTIVOS

Pipe depth

Most athletic fields have uniformly structured soils in the root zone, which drain relatively quickly. The depth of the pipe is primarily determined by the permeability of the surrounding soil, and the inches of water that need to be removed in a 24-hour period.
Turf grass root zones are fairly shallow, and drainage for most athletic fields is needed in only the top foot of soil. This, plus rapid water removal requirements, dictates a drain depth of one to two feet. However, in areas where salinization may be a problem, a deeper drain depth may be warranted. Many times, particularly in stadiums, a 6” to 8” soil/sand mix is imported to the site. This soil is usually of higher permeability than the existing subgrade, which can be compacted up to 95%. Because the imported soil does drain quickly, it is important to position the drainage lines close to the soil mixture in order to accept and carry the water away to an outlet. Pipe should never be covered with an impermeable layer of soil.

Water removal rate
Professional sports stadiums, particularly those subject to frequent heavy rainfall, may call for several inches per hour of water removal, while for most other venues, a removal rate of a half-inch per hour would be adequate.
If we know the playing field dimensions, the desired water removal rate, and the space between 4” lateral drain lines, we can calculate the water removal rate needed for each
line as follows:

Given:
Area of football field = 160 ft. x 360 ft. = 57,600 sq. ft. = 1.32 acres
Desired water removal rate = 12” in 24 hrs = 288 GPM per acre
4” lateral drain pipe = 10 lines, each 360 ft. long, 16 feet apart
Then:
Area drained by each pipe = 16 ft. x 360 ft. = 5,760 sq. ft. = .132 acres
Removal rate for entire field = 288 GPM x 1.32 acres = 380 GPM
Removal rate per line of pipe = 380 GPM ÷ 10 lines = 38 GPM per line