How to set the Mini Disk Infiltrometer suction for various soil types

[CamilleLee]

Setting the correct suction rate is crucial when using a Mini Disk Infiltrometer for different soil types. Here is how to adjust the suction rate for optimal results: First, identify the soil type you are testing (e.g., sandy, loamy, or clay). Next, choose the appropriate suction rate. For general use, a suction rate of 2 cm is often suitable. For sandy soils, consider a higher suction rate, up to 6.0 cm. For more compact soils, you might need a lower rate, such as 0.5 cm. To adjust the suction rate, move the suction control tube up or down until the water level in the Mariotte chamber aligns with the desired suction rate marking on the tube. Ensure accurate measurements by verifying the water level matches the selected suction. If the suction control tube is difficult to move, a small amount of vacuum grease can help. Proper suction rate adjustment ensures accurate and reliable measurements of unsaturated hydraulic conductivity with your Mini Disk Infiltrometer.