Friday, November 13, 2015

Metamora's bunker renovation step by step.

I mentioned in the previous post what the bunker renovation process entails. In this post I will explain in greater detail the entire process. Below is a step by step list of what goes into Metamora's bunker renovation with pictures for you to enjoy.

The first step is to remove the old sand and few feet of turf that surrounds the bunker. The turf removed from the perimeter helps us define the size and shape of the bunkers. As bunkers age they typically get smaller, in our case some of the bunkers are close to 25 years old.

Old sand and grass being removed
 Sand piled up for removal

The next step is to remove the old drain tile and bedding material like pea stone or gravel. Once that is completed, the bunker floor is re-graded.

Old drain system being removed
The bunker floor being re-graded

During the re-grading process sometimes you find surprises.

A huge rock right under the surface

The third step is creating the new shape and style. As mentioned bunkers shrink over time due to sand build up. When smaller bunkers are preferred, but there is a sand build up that you don't want to or can't remove, burlap bags filled with topsoil make a great alternative. These bags can be stacked and molded. Using sand as a wall is not a good choice as it doesn't create a firm foundation to keep sand inside the bunker and doesn't hold up well to traffic from golfers and especially mowing equipment.

Sand build up in front of bunker
Burlap bags filled with screened topsoil

Once the bunker floor is graded, new drain lines are dug. Every bunker may have different drainage patterns. This depends on the size and shape of the bunker. In many cases new exit drain lines have to be installed. This is due to the new drainage system being installed much deeper than the original system.

New drain line trenches
Drain line trenches

Once the dirt from the drainage trenches is raked out or picked up, instillation of the new drainage system is installed. The new system, I am very excited about. This drain tile is spiral corrugated inside and out, fitting screw on and this pipe is bedded in sand. This system has been very easy to install and given how much rain we have received so far this fall it is working great.

ADS Turf flow fine perforated drain tile
Drain tile getting back filled with sand
Closer look at tile being bedded in sand

After the drain system is installed and trenches are back filled with sand to the bunker floor, we begin laying down sod. The sod inside the bunker is being used as a liner. This grass will be killed with round-up and new bunker sand will be installed on top of it. The sod's organic matter or thatch is what is used inside the bunker. The thatch which is composed of cellulose and lignin becomes a barrier between the native soil and the new bunker sand. The cellulose portion of thatch will decompose where the lignin portion will stay around for a long time. I have talked with several people that have used this method and they all feel it has worked well for them.

Finished bunker with drain lines exposed
Finished bunker

The last step in the renovation process is obviously the addition of the bunker sand.

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