One of the most frequently asked questions with the VGM revolves around irrigation. The concept of the VGM is pretty simple, so naturally users want to understand the maintenance better. Tournesol Siteworks doesn’t typically provide irrigation for the VGM – the installing contractor can purchase it locally and save on our mark-up. That being said, we do recommend a simple strategy for using drip irrigation on the modules. A diagram is shown below.
We recommend running a main irrigation line along the bottom of the system, then plumbing “laterals” vertically up every other rail. A multi-outlet pressure compensating emitter is located at the top of each row, and short feeder tubes are run to the top of each box. This works very effectively at the Garfield Park Conservatory project.
In this application, the water was provided from a water faucet in the wall. A removable, flexible hose was run down to a battery-operated timer and valve in a valve box below. From there, the main line was buried in the soil along the wall, and the laterals were brought up the wall to the rails.
The emitters used here were 2GPH 6-outlet pressure-compensating units, and three tubes were run to the top of each box. After the installation the sysetm was run for 10 minutes every other day. The drippage from the wall was minimal, and the moisture level appeared sufficient for robust plant growth.