How long does the weed take to grow back?
Weed has an annual growth cycle and is seasonal meaning growth changes depending on weather conditions. Generally a continued maintenance program is the best method for optimising water quality.
How much does it cost to harvest weed?
This depends on variables in each harvesting operating. Variables are weed bed distance from shoreline, weed density, extraction method from harvester, and disposal method. Our pricing model is capable of calculating accurate harvest program costs.
How long does it take to see results?
Visual results are immediate as weed is removed. Water quality results are rapid as toxins are removed and this has an effect on wildlife rejuvenation.
Does it actually improve the quality and clarity of the water?
Absolutely – by removing the weed itself the results are dramatic. Weed no longer decomposes over the winter which reduces sediment build-up, gas release and stops depletion of oxygen in the water column. Nitrates and phosphates accumulate in weed and so are removed with weed harvesting.
Does the harvesting process damage the wildlife in and around waterways?
In general the impact is minimal. However some fishlife are brought up with the weed, these are released wherever possible.
Are there other methods of controlling weed?
Yes the most common method is spraying weeds using chemical application. There are other dredging systems, vacuum systems, divers and manual systems which can be used however it is our experience these are very labour intensive.
What safety programs are in place for the vessel?
Our safety program works under the maritime NZ Safe Ship Regulations. We operate a health and safety program for the complete operation meaning there is no risk or liability for the consumer.
What happens to the weed after it arrives onshore?
The weed is loaded onto a dump truck by the digger and transported to a designated dump site for storage. In many cases a sealed road truck is then loaded to transport the weed to a worm farm and turned into a fertiliser.
Can you transport the harvesting operation to the South Island?
We cannot unfortunately due to the risk of Didymo infection.
Are there any chemicals used in the harvesting operation?
No harmful chemicals are used in the operation. Fuels and oils are used to operate machinery , these are well contained and should not enter the waterways. A small amount of chemical is used for cleaning down, these are bio-degradable.
How do you transport the Harvester?
It is transported on a specially designed trailer.