Banana project computation

July 2025 release

Banana industry

Banana industry new release. This is based on revised paddock modelling and updated management practice adoption surveys.

The method automatically runs the HowLeaky model in real-time for the specified project to tailor predicted water quality improvements to the parameters of the project, rather than looking up a pre-run library of paddock modelling outputs to select the closest available.

Other improvements:

• Fine sediment proportion now applied based on the P2R catchment modelling.
• To-stream delivery of fine sediment, DIN in runoff and DIN in drainage now spatially (and version) explicit.
• Soils (associated parameters) and slopes have been updated.

Compared to the previous version:

• Erosion rate reductions are similar as they are proportional.
• Predicted sediment savings (mass) are likely to be reduced for large projects due to the above changes, however smaller projects could have increased export. Testing on existing projects indicated this could be about 0.35 of fine sediment export for large projects or ~1.4 times increase for smaller projects.
• New modelling generates ~3 times more runoff and drainage DIN losses and can generate significantly more DIN impact from nitrogen rate projects based on entered rates.

Additional guidance for the banana survey questions is available here.