Wai Māori
Stormwater
& Freshwater
Expert stormwater & freshwater solutions for your project.
POND DREDGING & SILT REMOVAL.
Lakes and ponds with excessive settlement and nutrients can experience:
- Depletion of oxygen
- Death of fish and other aquatic organisms
- Excessive aquatic weed growth or harmful algae blooms
- Botulism outbreaks that kill ducks and other waterfowl
The impacts of Climate Change on lakes and ponds makes it even more important that sediment levels are controlled to keep the ratio of sediment to water in balance and maintain a healthy water temperature.
Our high capacity dredges efficiently extract sediment from the floor of stormwater ponds, pumping it to shore where the slurry is dewatered, and solids captured in fully sealed hook containers. The filtered water is returned to the pond and the containers are then uplifted and transported to a sustainable disposal facility.
BENEFITS.
Modular and scalable to maintain productivity on ponds of all sizes.
Healthier waterways and ecosystems.
A small working footprint for sites with restricted space.
Low noise during extraction, and silent during dewatering.
Our dredging services are also applied to:
Pond Dredging
Estuary Dredging
Retention Pond Dredging
Dam Dredging
River Dredging
Marina Dredging
Cubic Meters of sediment removed from Aotearoa’s Waterways.
Achieved Reduction in Cartage
Achieved Reduction in CO2 Emissions Reduction
Achieved Reduction in Waste Creation
NITROGEN REMOVAL.
When water becomes polluted with an excess of nitrogen in the form of Nitrates and Ammonia Nitrogen, this leads to eutrophication and consequent accelerated aquatic weed growth and nutrification.
We have treatments available for nitrogen removal from water, be it freshwater or stormwater.
PHOSPHORUS REMOVAL.
Phosphorus is an element found naturally in water and soil. Like nitrogen, phosphorus is essential for plant growth. The quantities of phosphorus in soil are generally small, and this can limit plant growth, which is why phosphate fertilisers are often applied on productive land.
When too much fertiliser (synthetic fertilisers or livestock effluent) is applied to land, any Phosphorus not used by plants can be lost from the soil through leaching and run-off or overland flow. Because Phosphorus usually clings to soil particles, the main way in which Phosphorus gets into water is when soil is washed into waterways and becomes sediment. This has a cumulative effect over the decades as the Phosphorus laden silt builds up in the bottom of the waterbody. Phosphorus causes excessive growth of plants Macrophytes, Periphyton and Phytoplankton in waterways, lakes and estuaries and this leads to eutrophication.
To aid in restoring a pond that is suffering from excess Phosphorus, we can perform Phosphorus removal from water through treating the water column and the sediment settled in the bottom of the pond. This treatment captures and removes the Phosphorus by permanently binding the Phosphate ion to become an inert mineral.
AQUATIC WEED REMOVAL.
Aquatic weeds are natural components of healthy water systems, but they can grow out of control and become a nuisance.
Excessive aquatic weed growth can happen for various reasons including introduced weeds invading water bodies, lack of shading and increased nutrients entering the water from use of synthetic fertiliser and livestock effluent.
While there are herbicides approved for use to kill aquatic weeds this solution however allows the dying weed to release its stored nutrients back into the waterbody. Often it is best to or essential to physically remove the weed from the waterbody. This results in the effective removal of the nutrients (Nitrogen & Phosphorus) from the waterbody that the weed has collected and stored within itself.
We perform effective aquatic weed removal by mechanically harvesting the weed, and pumping it by pipeline back to shore, where it undergoes dewatering and particle capture. Our high-volume pumping capability means minimal weed litter is allowed to escape during the harvesting process.
The dewatered aquatic weed is then removed from site for organic repurposing.
STORMWATER DRAINAGE CLEANING.
We bring innovation to our clients nationally through specialised equipment and technical knowledge. An example of such innovation is our recycler vacuum trucks ability to treat and remove solids and contaminates on site, returning the cleansed water to it’s source.
Our innovative stormwater services can help you with:
Sump cleaning
Retention tank cleaning
Interceptor cleaning
Separator cleaning
Stormwater filter cleaning
Up Flo filter maintenance
Sand filter cleaning
CLARIFIER CLEANING.
Our recycler vacuum trucks provide a great solution for clarifier cleaning and reservoir cleaning at water treatment plants. Their strong vacuum capability means sludge can be efficiently lifted from the clarifier floor and the recycling capability means we are not leaving site frequently to unload.
The benefits to you:
- Environmentally sustainable alternative to traditional waste removal
- Improved environmental outcomes as liquid waste generation is reduced
- Efficiency and time are gained with the ability to service large waste volumes without leaving site
- Carbon emissions are reduced through significantly reduced travel and cartage of bulk waste
