(i) Infiltration capacity
- Infiltration capacity (f) is the maximum rate at which a soil is capable of absorbing water in a given condition.
- The infiltration capacity is defined as the maximum rate of infiltration.
- It is most often measured in meters per day but can also be measured in other units of distance over time if necessary.
(ii) Infiltration rate
- Infiltration rate (IR) is defined as the volume flux of water flowing into the profile per unit of soil surface area under any set of circumstances.
- Infiltration rate means the rate of water entry into the soil expressed as a depth of water per unit of time (e.g., inches per hour).
(iii) Rainfall excess
- It is the volume of rainfall available for direct surface runoff.
- It is equal to the total amount of rainfall minus all abstractions including interception, depression storage, and infiltration.
