We have already studied different soil water and soil water constants. If not, please refer to the articleÂ Soil Water and Soil Water Constants.

Water Requirements of Crops - Equivalent Depth of Water in Irrigation Image Courtesy: www.mvi.farm |

At different soil state, the equivalent water depth will be different. We will discuss the equivalent depth formula for each state. The formula requires the specific gravity of soil (S) and the depth of the root zoneÂ (d) along with the moisture content at each state of the soil.

### Equivalent Depth of Water at Field Capacity

The Equivalent depth (dw) at field capacity (FC) is
dw = S x d x F.C

### Equivalent Depth at Water at Permanent Wilting Point

dw at PWP is

PWP = S x d x PWP

### Equivalent Depth at Available Water

dwÂ of available water is

dw = S x d x (FC - PWP )

### Equivalent Depth at Readily Available Water

dw = S x d x ( FC -OMC)

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Tags: Foundation, Construction
Irrigation Engineering