Infiltration is the process of water penetrating the ground surface. The intensity of this process is called the infiltration rate. The double ring infiltrometer is suitable for measuring infiltration rates in almost any type of soil and can be used for the design of shallow groundwater recharge structures (Recharge pits/Trenches). To conduct DRIT test, follow the steps below:
1- Place the DRIT apparatus on the clear and flat ground surface.
2- Insert the infiltration ring about 5 cm vertically into the soil using the impact-absorbing hammer. Make sure you don't disrupt the soil too much.
3- Fill the outer ring with water, then the inner ring, to approximately 50 - 100 cm. Start noting the time and the water level in the inner ring (reference level) as indicated on the measuring rod.
4- Stop measuring only if the infiltration rate has reached a constant value. A change of < 10% in a certain phase is often considered as constant. Depending on the type of soil this may occur within 1 or 2 hours.
6- Feed the data into an online tool to get results
Initial Water Level (mm)
Cumulative Water Level in the ring since the start of the test
Final Water Level (mm)
Water Level in the ring at the end of the test
Time period between initial and final water level(s)
Double Ring Infiltrometer
Infiltration Rate (mm/hr)
The water level within the infiltration rings should be as low as possible to ensure vertical infiltration.The rings should not go dry. Make sure to have sufficient water at hand. Filling one set of rings requires approx. 25 litre.
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