Group

Infiltration rate (mm/hr)

Soil texture

A

High

>25

Sand, loamy sand or sandy loam

B

Moderate

12.5 - 25

Silt loam or loam

C

Low

2.5 - 12.5

Sandy clay loam

D

Very low

<2.5

Clay loam, silty clay loam, sandy clay, silty clay or clay