dual head infiltrometer

Soil Saturated Hydraulic ConductivityThe DualHead infiltrometer measures soil saturated hydraulic conductivity, or Kfs. It is fully automated and requires no post-processing of data.

No Babysitting – Set it up and leave it to add water, maintain correct pressure heads, measure infiltration rates, and calculate K

Easy to Carry – Sized for one person to easily carry and install.

Simple Installation – Pound in the ring, connect the hoses, and set the parameters.

Run 3-4 Simultaneously – Designed and priced so you can account for spatial variability.

Eliminate “Guess Factor” – Measures infiltration at two different pressure heads to find (rather than estimating or guessing) the soil macroscopic capillary length factor (alpha).

Use Less Water – The DualHead uses air pressure to maintain the pressure heads. No need to adjust and measure water levels.

Proven Method – An automation of the method used by Reynods and Elrick (1990) and others.


Double Ring Infiltrometerhow does it work?

Pound a ring into the soil, seal on the Infiltrometer Head, and connect the hoses to the control unit. Set up the test.

The Infiltrometer will pond water on top of the soil and use air pressure to create two different pressure heads. It will automatically maintain the correct water levels and will measure infiltration rates through two complete pressure cycles. The control unit collects all data and performs the calculations to determine field saturated hydraulic conductivity (Kfs).

All data can be downloaded from the control unit for further analysis.



Water flows through soil in three dimensions. In the early days of infiltrometers, it was simply impossible to solve two and three dimensional equations, so the dual ring infiltrometer was created to try to physically force water to flow in one dimension.

Now that we can do the math, the single ring infiltrometer is an easier–and better–method. However, if you’re using a single head or a changing head, you still need to know–or guess–the “alpha factor” (soil macroscopic capillary length) to solve the equations.

Reynolds and Elrick (1990) showed that by solving the equations at two different pressure heads, alpha drops out, allowing you to determinesaturated hydraulic conductivity without making any assumptions.