As part of the Water for Profit Program, TIA’s Dr Bill Cotching recently ran a two day masterclass on farm drainage planning. The session was specifically designed for consultants who deliver drainage plans to farmers.
Some of the key take-home messages were:
- Four rules of drainage:
- Design in the wet, install in the dry
- Check the outfalls
- Isolate and elevate
- Drain in stages
- Find the outfall – may have to check with neighbours
- Use google earth images
- Determine soil type as it is important for drain type
- Catchment and paddock scale water
- Where is the water coming from – use intercept drains
- Placement of intercept drains ABOVE wet areas, particularly on sloping ground.
- Check for dispersive subsoils - yes or no to mole drains.
- Integrate different drain types on one area.
- Underground drains really do work; pay back starts NOW.
- On-going maintenance/management of drains is required.
- Use land manager/owner input for local knowledge of where water ponds and flows.
- Understand the client’s needs and budget.
Published on: 11 Sep 2017