Barratta Creek has experienced some water quality exceedences so we thought it would be a really important site to actually trial a constructed wetland treatment system. So we’re looking at ways of moving back up through the catchment and intercept the nutrients and sediment that finding their way to the reef. This was a borrow pit before so we saw as an opportunity to repurpose something that was already here without impinging on productive land. The difference is now we are slowing that water down and intercepting it. Before the water probably came in and out in – maybe in an hour or two. We are wanting to hold it back for about 24 to 36 hours.
The inlet to the wetland is normally a standing water area where the water is slowed down and the sediments are settled out. This captures it in a location that is easily accessible and can be cleaned out. We put in these diversion buttons to create a convoluted flow path so that the water is then pushed up through all the reeds and around the end and then and then back down in a much more controlled way and similarly on the inlet on the opposite end there’s another bund that pushes water in and around and we deliberately did that to make more use of the wetland area. (more…)