With Northern California experiencing the most rain we have had in 3 to 5 years (depending on who you ask), it seems a bit ironic that this post is about our new irrigation system that we installed this week.
We are VERY happy for the rain, even if it meant the island was closed today. With three years of drought, the winter rains we had been receiving was never adequate to fully saturate the dry soil, and while water catchment would be filled, there was a deficit of moisture in the ground each year.
All of the gardens are hand watered except for the pelargonium trough, the new lighthouse lawn and the toolshed terraces. The trough line was installed when the pelargoniums were planted in 2005, and we recognized the need to water the dry toolshed terraces last winter to keep the plants healthy and thriving.
This past summer, staff and volunteers spent the majority of working days hand watering the remaining gardens, and often, our efforts were still not quite enough. The plants got by on rationing our supply and when our tanks went dry we were lucky enough to still have access to the barged in fresh water.
We wanted to be proactive this year, and not only save ourselves time watering but use the water more efficiently by installing water emitters directly to the plants.
The rose terrace is supplied by one tap that is gravity fed from the holding tank at the summit of the island. The rose terrace itself is flat but there is enough pressure to meet our needs. Staff member, Karolina, designed the rose terrace to have 4 irrigation zones. Each zone, running by its self has enough water pressure to fully cover all of the plants in each zone.
For each zone, we have a 1” pipe that will connect to our garden hose. Using shut off valves, we can select which zone we will water. Connected to the large pipe are the ¼” spaghetti tubing connecting a bubble emitter at the base of each plant. We can even adjust for future plantings by adding a spaghetti tube or by plugging a hole and removing the tube.
A pretty simple system for the do it yourself home gardener that will undoubtedly save time.