Infiltration test using double-ring infiltrometer
Objective:
To find rate of infiltration or the rate at which water enters in soil.
Apparatus used:
Double ring infiltrometer (diameter of the inner ring is 30 cm & outer ring is 60 cm), Hammer, Water level indicator, Stopwatch etc.
Description
Infiltration rate is the rate at which the infiltrated water is observed by the soil.
Select any one of the given field.
Place the inner ring and then hammer the inner ring of the double ring infiltrometer into the soil using a driving plate.
Place the outer ring of the double ring infiltrometer and then hammer the outer ring into the soil (Care should be taken cause minimum disturbance to the soil).
Place the water level indicator inside the inner ring to note down the readings of water level.
Fill inner and outer rings with water and maintain equal water level in both rings.
Start the stopwatch once the water is added equally into both the rings upto the mark. Note down the water level readings after smaller intervals of time.
| Time change, △T(min) | Initial Water level in the inner ring, H(cm) | Amount of water added to bring to the original level(cm) | Final Water level in the ring after adding water | Height change △H (cm) |
| 1 | 20.0 | - | 17.1 | 2.9 |
| 1 | 17.1 | - | 14.3 | 2.8 |
| 2 | 14.3 | - | 9.7 | 4.6 |
| 5 | 20 | 10.3 | 10 | 10 |
| 5 | 20 | 10 | 11 | 9 |
| 5 | 20 | 9 | 11.5 | 8.5 |
| 5 | 11.5 | - | 3.6 | 7.9 |
| 5 | 20 | 16.4 | 12.6 | 7.4 |
| 5 | 12.6 | - | 5.6 | 7.0 |
| 5 | 20 | 14.4 | 13.3 | 6.7 |
| 5 | 13.3 | - | 7.2 | 6.1 |
| 5 | 7.2 | - | 1.7 | 5.5 |
| 5 | 20 | 18.3 | 15 | 5.0 |
| 5 | 15 | - | 10.5 | 4.5 |
| 5 | 10.5 | - | 6.1 | 4.4 |
| Time change, △T(min) | Initial Water level in the inner ring, H(cm) | Amount of water added to bring to the original level(cm) | Final Water level in the ring after adding water | Height change △H (cm) |
| 1 | 20.0 | - | 17.9 | 2.10 |
| 1 | 17.9 | - | 15.99 | 1.91 |
| 2 | 15.99 | - | 12.39 | 3.6 |
| 5 | 12.39 | - | 3.84 | 8.55 |
| 5 | 20 | 16.16 | 12.4 | 7.60 |
| 5 | 12.4 | - | 5.65 | 6.75 |
| 5 | 20 | 14.35 | 13.95 | 6.05 |
| 5 | 13.95 | - | 8.90 | 5.05 |
| 5 | 8.90 | - | 4.25 | 4.65 |
| 5 | 20 | 15.75 | 15.60 | 4.40 |
| 5 | 15.60 | - | 11.40 | 4.20 |
| 5 | 11.40 | - | 7.8 | 3.60 |
| 5 | 7.8 | - | 4.55 | 3.25 |
| 5 | 15.45 | - | 12.55 | 2.90 |
| 5 | 12.55 | - | 9.7 | 2.85 |
Observations:-
| Time change, △T(min) | Initial Water level in the inner ring, H(cm) | Amount of water added to bring to the original level(cm) | Final Water level in the ring after adding water | Height change △H (cm) | Infiltration rate △H/△T,I (cm/min) |
Cumulative infiltration amount (cm) |
| 1 | 20.0 | - | 17.1 | 2.9 | ||
| 1 | 17.1 | - | 14.3 | 2.8 | ||
| 2 | 14.3 | - | 9.7 | 4.6 | ||
| 5 | 20 | 10.3 | 10 | 10 | ||
| 5 | 20 | 10 | 11 | 9 | ||
| 5 | 20 | 9 | 11.5 | 8.5 | ||
| 5 | 11.5 | - | 3.6 | 7.9 | ||
| 5 | 20 | 16.4 | 12.6 | 7.4 | ||
| 5 | 12.6 | - | 5.6 | 7.0 | ||
| 5 | 20 | 14.4 | 13.3 | 6.7 | ||
| 5 | 13.3 | - | 7.2 | 6.1 | ||
| 5 | 7.2 | - | 1.7 | 5.5 | ||
| 5 | 20 | 18.3 | 15 | 5.0 | ||
| 5 | 15 | - | 10.5 | 4.5 | ||
| 5 | 10.5 | - | 6.1 | 4.4 |
| Time change, △T(min) | Initial Water level in the inner ring, H(cm) | Amount of water added to bring to the original level(cm) | Final Water level in the ring after adding water | Height change △H (cm) | Infiltration rate △H/△T,I (cm/min) | Cumulative infiltration amount (cm) |
| 1 | 20.0 | - | 17.9 | 2.10 | ||
| 1 | 17.9 | - | 15.99 | 1.91 | ||
| 2 | 15.99 | - | 12.39 | 3.6 | ||
| 5 | 12.39 | - | 3.84 | 8.55 | ||
| 5 | 20 | 16.16 | 12.4 | 7.60 | ||
| 5 | 12.4 | - | 5.65 | 6.75 | ||
| 5 | 20 | 14.35 | 13.95 | 6.05 | ||
| 5 | 13.95 | - | 8.90 | 5.05 | ||
| 5 | 8.90 | - | 4.25 | 4.65 | ||
| 5 | 20 | 15.75 | 15.60 | 4.40 | ||
| 5 | 15.60 | - | 11.40 | 4.20 | ||
| 5 | 11.40 | - | 7.8 | 3.60 | ||
| 5 | 7.8 | - | 4.55 | 3.25 | ||
| 5 | 15.45 | - | 12.55 | 2.90 | ||
| 5 | 12.55 | - | 9.7 | 2.85 |
Accumulated infiltration depth = Please Enter Value to proceed
Average infiltration depth = Please Enter Value to proceed
Accumulated infiltration depth = Please Enter Value to proceed
Average infiltration depth = Please Enter Value to proceed
Please Enter Value to proceed Inference: Vegetated grass land has a higher rate of infiltration than the barren land. Hence barren land generates excess surface runoff.Both ends of the pipe must be trimmed to ensure parallel faces.
