Testing & Validation

Rocky Point Hydromulch has been independently tested and validated to ensure our product is a high quality solution for erosion control.

Not only is it a combination of certified organic and recycled products, all of which have been tested for pathogens, leachate and contaminants such as seeds, but it is cost effective when compared with other treatments available on the market.

We know our product, where it comes from and what it is made of. By working with our customers, we are systematically addressing all of the issues faced by todays land reclamation industry. We know it works and it keeps on working to stabilise and help the growth of vegetation.

Whether it’s an infrastructure corridor, sensitive water catchment area, mine site, road side or urban development, Rocky Point Hydromulch is suited for use in applications and the results show. It’s a trusted solution to your surface stabilisation needs.

Research carried out by: Pandanus Solutions.

Pandanus Solutions were engaged to coordinate the project, the research trials and research existing information and collate the results

Environmental Soil Solutions Australia Pty Ltd were engaged to assist with leachate testing, pathogen testing and seed testing

LandLoch Pty Ltd were engaged to test the response to rainfall and overland flow, as well as germination testing

Methodology:

  • Triplicate test plots in a red clay topsoil
  • 30% gradient
  • Equivalent rainfall of a subtropical storm – 90-105mm/hr for 30minutes
  • Equivalent to a 1in 10 year event for Brisbane

Product combinations and application rates:

  • 3t/ha mulch with 100kg/ha Supernatural & 10kg/ha of Hydromulch tackifier
  • 3t/ha mulch with 200L/ha of Seed, Stay & Grow
  • 4t/ha mulch with 200kg/ha Supernatural & 15kg/ha of Hydromulch tackifier
  • 4t/ha mulch with 400L/ha of Seed, Stay & Grow
  • 6t/ha mulch with 300kg/ha Supernatural & 20kg/ha of Hydromulch Tackifier
  • 6t/ha mulch with 600L/ha of Seed, Stay & Grow

Definition of BFM Standard according to IECA (Australasia) 2010

  1. Can be used without seed content as a non-vegetated, short term erosion control technique but not recommended
  2. Weed control benefits depend on mulch type, glue type and application rate.
  3. Long-term benefits can be provided by the resulting vegetation cover (if hydro-seeded prior to application of BFM)

Key Principles

  1. Application rate and surface cover are critical to its short-term erosion control.
  2. Wet strength is determined by the choice and mix of non-rewetting glues.
  3. Treated soil should not be visible after application of the Bonded Fibre Matrix (BFM)
  4. Soil testing, soil treatment and preparation is critical for successful vegetation establishment.

Landloch Testing 2017:

In 2017 Rocky Point Mulching engaged an independent consultan

TreatmentApplication Rate (t/ha)Binder/Tackifier Application RateAverage Steady Infiltration Rate (mm/h)Average Sediment Concentration (g/L)C-Factor
Control-074.717.81
Hydromulch with Supernatural + Hydromulch Tackifier3100kg/ha +
10kg/ha17.52.60.5
4200kg/ha +
15kg/ha11.60.980.19
6300kg/ha +
20kg/ha360.750.11
Hydromulch with Seed, Stay & Grow3200L/ha11.20.380.07
4400L/ha48.20.260.03
6600L/ha610.240.02

Sugar Cane Hydromulch performs up to BFM standards:

Overland flow tests to distruction:

Plant establishment tests:

Pathogen & Weed tests:

Pandanus Solutions Conclusion:

  • Free of weed seeds and plant pathogens
  • Recycled paper component is virtually leachate free
  • C:N ratio can be addressed through fertiliser application
  • All application rates and combinations reduced erosion by intense rainfall, with C-factors as low as 0.02 under intense rain
  • Critical flows and shear stresses increased with rates of application and achieved a maximum stability for one treatment consistent with a 111m long slope on 30% gradient with 50mm/h runoff rate
  • Plant growth is not hindered but promoted by mulch use and there is little to no detrimental effects with heavier applications (for steeper or longer slopes)
  • Product conforms with a BFM standard

The research showed that when using Sugar Cane/Paper the resulting “C” factors conformed to TMR16 Specification for a BFM (Bonded Fibre Matrix:

Transport and Main Roads Specifications – MRTS16 Landscape and Revegetation Works
Table 7.4.4 – Bonded Fibre Matrix Performance Standards

Application rates:

SlopeApplicationDepth
2:1 Batter3.5 – 5 Tonne3 – 5 mm
3:1 Batter2.5 – 3 Tonne2 – 3 mm
Up to 4:1 Batter2 Tonne2 mm

Landloch Conclusion Note:

All Hydromulch treatments reduced erosion by intense rainfall, though erosion control benefits were reduced somewhat by the action of the treatments – presumably the tackifiers – In reducing steady infiltration rates. Nonetheless, the most effective treatment did demonstrate C-Factors as low as 0.02 under intense rain.

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