As I mentioned, about 53% of our irrigation distribution system is now in underground pipelines. That has been ongoing for many years. The reason for doing it is to increase water efficiencies and ensure that we're making the best use of the water. In terms of mussels getting established in our irrigation reservoirs, our pipelines in effect draw off of those irrigation reservoirs that store that water and distribute it.
We are anticipating that due to the pipelines being in the ground, typically below frost in a lot of cases, there is the possibility that those mussels could get established over a winter and continue to reproduce in the pipelines, especially where there are areas of ponding over winter. Pipelines are normally drained over the winter season. However, there are ponds in places, in coupling joints and things like that. We are concerned that the mussels could get in there, establish and continue to reproduce.