What is Bunker Dry?

Bunker Dry, a revolutionary way to keep golf course bunkers and grassed depressions free from rainwater and in play for golfers. Bunker Dry is designed and manufactured in Australia.

Benefits of using Bunker Dry

Bunkers are an expensive asset to manage. Golf courses which feature bunkers offer a superior challenge and are more attractive for players, so efficient maintenance is critical.

The Bunker Dry system simply drains water from bunker sand at a higher flowrate than TRADITIONAL systems and eliminates the ingress of sand into the drainage system and is easily fitted to new and TRADITIONAL bunkers without undertaking major works on the course.

With more than 8 years of development, modelling and testing in real golf course conditions, Bunker Dry has a proven record and is now available at a fraction of the cost of other drainage systems. A whole course can be fitted for the price of one hole using some conventional systems.

With effective drainage, not only is course availability improved, but the elimination of water ponding in bunkers can minimise the need for maintenance, reduce soil erosion at the edges of bunkers and the flow of silt into the bunker sand. As an added benefit, water extracted through the Bunker Dry can be recovered and stored in a lake or dam as it is naturally filtered through the sand.

For grassed depressions, Bunker Dry allows water to flow into a drainage pipe without a grate which can be an obstacle for Golfers, as well as reducing water carrying organic and chemical contamination.

How it compares with traditional drainage systems
  • Bunker Dry is not like traditional drainage systems which typically use a porous membrane which filters into a sub-soil drain. Bunker Dry does not rely on water infiltrating the drainage system. The problem with TRADITIONAL drainage systems such as agg pipes and other drains is they rely on very small holes or slots to capture the water and limit the sand entering the pipe. This restricts flowrates.
  • There are two issues which make this type of drainage system unsuitable for bunkers;
    1. Water carrying minute particles will eventually pass through the porous mediums and enter the pipe. Over time this will block the pipe,
    2. By design, water is restricted from entering the pipe to limit the particles and fines. In other words, flow into the pipe is slow which leaves the bunkers full of water for longer
  •  The Bunker Dry© device is different. Unlike conventional drains which features small holes or slots and coupled with geotextile wrapping to filter the water and limit the sand ingress, the Bunker Dry© device relies simply on gravity and hydraulic pressure to,
    • a) remove the water from the sand at a higher flowrate
    • b) eliminate the ingress of sand.
  •  The Bunker Dry© system does this by protecting the inlet to the drain with an inverted cap which allows water in at a much higher flowrate and keeps sand out which allows free flow inside the drain. The elimination of sand is a major factor for performance and maintenance of the drainage system. See illustration below.
  • Water flows freely through sand. You will note that sand is also used in a grassed depression installation as well. The rate of flow depends on the on the type of sand and the depth. The Bunker Dry device is designed to be installed between 125mm-200mm (5″-8″) below the surface of the sand (bunker), or 75mm-100mm (3″-4″) below turf. It can be deeper if required. This depth allows the device to perform as follows:
    1. Be unobtrusive and invisible
    2. Situated below the depth of a club stroke
    3. Also situated below the depth of maintenance in the bunker or grassed depression e.g.;grooming machines, mowers
    4. Accessible for maintenance
    5. Best location hydraulically to drain water from the bunker
  • All bunkers and grassed depressions are different, however they all share several things in common. Nearly all bunkers have a low point(s). This is apparent when rain fills a bunker and water is seen pooling over the sand. Most modern bunkers employ a drainage system which draws water from the bunker and most of the water from the low points. The key to Bunker Dry’s success, is to position the device at the low points of a bunker. When installing a Bunker Dry system in an existing bunker, the bunker low point(s) are usually adequate to be effective. The same method applies for grassed depressions.
  • Another innovation is Bunker Dry recommends a solid drainage pipe over conventional slotted pipes/strip drains for several reasons;
    1. Solid pipe can be laid straight and true and most importantly, at grade which makes it self-cleaning,
    2. Solid pipe has a smoother bore which improves flow,
    3. Solid pipe will resist tree roots,
    4. And solid pipe does not allow infiltration which will carry particles and fines.

    We have retrofitted many Bunker Dry units to existing slotted pipe installations with great success. Our recommendation is to install solid pipe if it is a new build or a major renovation.

Bunker Dry© in bunker (section)
Bunker Dry© in grassed depression (section)
Our guarantee
  • The terms of this Guarantee are six (6) years for full replacement with no deductions,
  • The guarantee starts after the product has been installed. Customer is to advise Bunker Dry of the installation date for coverage to commence,
  • The guarantee is limited to the following conditions;
    • Bunker Dry device is to be installed strictly as recommended in the current installation manual,
    • Bunker Dry collection pipe is to be laid straight and true with a minimum grade of 0.5%. Recommended grade is 1% or higher,
    • Bunker Sand is to be free of clay fines and other contaminants which would inhibit permeability,
  • Due to its unique design, the Bunker Dry device is guaranteed against corrosion, material degradation, abrasion, freezing and low intensity impacts,
  • Bunker Dry is guaranteed to accept only water. Sand will not block up the collection pipe/s.
  • Bunker Dry is manufactured of the finest materials and will not react with the environment.
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