Expression of Interest (EOI) Spray Drift Hazard Alert and Warning System

The Cotton Research and Development Corporation (CRDC) and Grains Research and Development Corporation (GRDC) have been collaborating to minimise the risk of spray drift from cotton and grain properties.

Spray drift can be caused when vertical air turbulence is too weak to dilute fine airborne droplets or to cause air movements that force droplets to the ground. This situation is typically found during surface temperature inversions when cool air near the surface becomes trapped under the warm air above and forms an inversion layer. In strong inversions, the inversion layer is physically isolated from the weather situation above. In such conditions, fine droplets remain suspended in the air in concentrated form and may be carried off-site long distances by lateral airflows within the inversion layer.

Until recently, there has been no reliable and accurate method to determine when an inversion is Very Stable or Weakly Stable, i.e. when inversion conditions are hazardous or non-hazardous for spraying. A research project undertaken by the Western Australian Department of Primary Industries and Regional Development (DPIRD) and GRDC produced the initial methodology for an alert system.  Subsequent research funded by GRDC and CRDC has validated and further improved that methodology and has developed algorithms which allow near-term predictions of hazardous/non-hazardous inversion conditions. GRDC has been granted the required commercialisation rights from DPIRD to take the technology to market.

GRDC and CRDC wish to explore partnership opportunities with interested third parties to further develop and deploy a Spray Drift Hazard Alert and Warning System for use by cotton and grain producers in NSW and QLD, with potential to expand to other States and industries.

Once deployed, the Spray Drift Hazard Alert and Warning System will consist of a network of Profiling Automatic Weather Stations (PAWS), which collect and process local weather data that growers can access to obtain real-time information about hazardous and non-hazardous conditions in surface temperature inversions together with short-term predictions of such conditions. Preferably, this information is presented alongside other relevant weather information that affect decision making by spray operators.

This EOI process may be the first of a multi-stage procurement process. Further information on the next stage (if any) will be made available after the EOI is completed.

Registration of Interest and Confidentiality

Interested parties wishing to obtain access to the EOI Information Pack are required to register (in writing) by contacting Marie Ann Perry Upon registration potential applicants will be provided with the EOI Information Pack.

Interested parties who register will be deemed to have agreed to treat the information contained in the EOI Information Pack as confidential and not use the information contained in the EOI Information Pack other than for the purposes of preparing an EOI application and in subsequent discussions with GRDC and CRDC.

Any questions regarding this EOI should be addressed to:

Marie Ann Perry, Contract Administrator

Lodgement of EOI

Respondents must submit their Proposals by email to by Wednesday 8th July 2020, 05:00 PM ACT local time (the Closing Time) to be considered. Proposals lodged after the Closing Time or that do not provide all the information requested may be excluded from consideration.

Questions and answers

Q1: Accuracy specifications of the sensors used?

A1: All equipment systems and outputs must comply to;

  • AS3912.1 ‘Quality Assurance Requirements for measuring equipment - Metrological Confirmation System for measuring Equipment’.
  • World Meteorological Organisation Guidelines

Minimal senor specifications:

image of question table

Q2: Height the sonic anemometer needs to be placed above ground?

A2: Are to be deployed 2m and 10m above the surface.

Q3: With the inversion weather stations I can’t find the stipulations with the design. The specifications have 2D and 3D sonic sensors at 2m and 10m. What is required at 2m a 3D or a 2D? What is required at 10m a 3D or a 2D. In the specifications it mentions the accuracy or the Air temp and humidity and then mentions 1.25m. Do you want a temperature humidity sensor at 1.25m as well as 2m and 10m?

A3: The stipulation design is:

One 3D at 10m
One 2D at 2m
One T/Rh/ at 1.25m

Temperature difference is to be measured between 10m and 1.25m to an accuracy of 0.01oC