How To Assess Your Soil Drainage: A Guide to Completing An Infiltration Test
This is an accessible transcript for the above video designed to help people who use screen readers access the information.
An infiltration test is a good way to determine if your yard is suitable for a rain garden or soakaway.
- Dig a hole in the proposed location of your project to a depth of 50 cm.
- Fill the hole with water to saturate the soil.
- Return a couple of hours later and fill the hole with water again. This time measure the depth of the water in the hole.
- Wait 60 minutes and measure the depth of water again.
- Determine your infiltration rate with this calculation: Depth of water at beginning of hour minus Depth of water at end of hour.
For me: 17cm – 9cm = 8cm
8cm / 60 minutes = my infiltration rate.
An infiltration rate of 2cm or higher suggests your soil is well-draining and may be suitable for a rain garden or infiltration trench.