Short answer: Summer rainfall harvesting allows landowners to capture and store large volumes of water during heavy rain events, maximising every drop that falls on their property. Properly designed farm dams with adequate spillways and catchment areas can significantly boost on-farm water storage. Strategic earthworks and dam placement are key to making the most of seasonal rainfall.
Quick Answer: Maximising summer rainfall into your dam means keeping the catchment clear, maintaining inlet channels and diversion banks in good repair, and ensuring the spillway isn’t silted up before the wet season. A clean, well-shaped catchment can double the run-off into your dam compared to a neglected one.
Big Ditch’s ‘Catch Every Drop’ tells the story of the crippling drought in Australia. This is the cinema long-form version edit of ‘Catch Every Drop’ – for showing at cinemas before features – with guest appearance by Jimmy Barnes.
Key Takeaways
- Catchment condition — not just rainfall — determines how much water actually reaches your dam each year
- Clear inlet channels and diversion banks before summer so you don’t lose the first heavy rainfall to overflow
- Vegetation on catchment slopes increases absorption and reduces run-off — manage it based on your water security goals
- A clean spillway means your dam reaches full capacity before overflow — silt blockages waste precious early-season rainfall
- Check for stock damage to the dam wall and banks before the wet season — tracks and burrows create leak paths
Frequently Asked Questions
How can I increase how much rainwater runs into my dam?
Keep the catchment clear of dense groundcover, maintain inflow channels, and remove blockages or silt at the inlet. In marginal rainfall areas, a roaded catchment (compacted clay surface) can significantly increase run-off volumes.
What is a roaded catchment and is it worth building?
A roaded catchment is a sealed or compacted surface shaped to direct run-off into a dam. Common in low-rainfall WA and inland NSW/QLD. They’re expensive to build but highly effective where rainfall is marginal.
Can I pump water into my dam to supplement rainfall?
Yes — a pump system is common for farms near waterways. Check your water access licence requirements with your state water authority before installing a pump.
How do I stop silt blocking my dam inlet?
Install a silt trap or sediment basin upstream of the dam inlet. This collects sediment before it enters the dam and is much cheaper to clean out than the dam itself.
Need help with your own dam? Book a site inspection with Big Ditch — we build and repair dams across NSW, Queensland, and Victoria.