Better Billy Bunkers
GBGC bunker erosion after a storm in 2011
So how is this magic accomplished? This simplified image (from Dormie Network) illustrates the system.
The blue represents water which passes through the bunker sand and a porous layer of gravel into a drainage line at the bottom of the bunker, which transports the water away.
Steps to create these bunkers
After the bunker has been shaped, which in our case has been no small undertaking, drainage lines are installed allowing for 2 inches of gravel and 4 inches of sand.
Starting to spread gravel over drainage lines
Then 2 inches of gravel are spread
Gravel almost ready for polymer coating
Then a polymer binder is applied. This results in a sturdy pliable layer of glued gravel which allows water to pass through making the entire floor of the bunker, including the slopes, a permeable drainage field
Applying the polymer binder
The final step is sand installation and the finished bunker is revealed.
Newly shaped and designed "splash" bunker with a Better Billy Bunker liner system and with Idaho White sand installed on hole #9 at Granite Bay Golf Club.