A unique water survey conducted on the Glenthorne property in February is now complete. Find out what this means for Glenthorne’s central wetland area.
A bathymetric survey of Glenthorne’s middle dam has revealed that although the dam is particularly deep in one small section – measuring a total of 6 metres deep when full – the depths of the remaining sections of the dam are between 1-3 metres deep.
These findings mean that there are many options for the eventual design and modification of the dam to create a central wetland feature that has water year-round.
An above-water-level survey was also conducted on the area around the middle dam, which included the lower dam and downstream. This will inform the overall design of the whole water system for the property.
The Glenthorne National Park Master Plan proposes concepts that include the creation of a permanent wetland feature as well plans to restore water flows to the lower part of the property.
The restoration of flows to the lower part of the property will help the restoration of the creek line, providing habitat for aquatic flora and fauna currently absent from this part of the property.
Options are being considered to establish a water flow monitoring station on the property that will provide real-time data on flow volumes and durations. This is in addition to the information being gathered by ecologists on flows post rainfall.
Recent rainfall events in the area have demonstrated how quickly water flow is generated upstream and on the property. The recent rainfall events in February were sufficient to totally fill the top dam from empty.
Understanding the relationship between rainfall and water flows on the property is critical to ensure the safe and effective management of water on the property, including the design of key components of the central hub area detailed in the master plan.
Are there any fish in the dam?
Ecologists have also conducted a survey of the middle dam that has revealed that there are no fish present despite being stocked in the past.
This is good news as the species of fish previously stocked were non-native species, like trout, which are known to have negative impacts on native fauna.
The dam is not lifeless though and the survey did discover lots of long-neck turtles, along with yabbies and shrimp, all of which are native to the area.
Click the link below to see the turtles in action.
After a quick health check, the turtles were returned to the dam.
Main image: Glenthorne's middle dam.