Home » Simplify your calculations with ease. » Measurement Tools » Available Water Capacity Calculator

Available Water Capacity Calculator

The Available Water Capacity (AWC) Calculator is an invaluable tool used predominantly by agricultural scientists, soil experts, and farmers. It determines the amount of water that soil can retain for plant use, factoring in the soil's properties and depth. This calculator is essential for optimizing irrigation practices, enhancing crop yield, and promoting sustainable water management in agricultural settings.

Formula of Available Water Capacity Calculator

The formula to calculate Available Water Capacity (AWC) in soil is:

AWC = (FC - PWP) * BD * Soil Depth

Where:

• FC (Field Capacity): The maximum amount of water soil can hold after it has drained freely, usually measured a few days after watering and expressed as a percentage or fraction of the soil volume.
• PWP (Permanent Wilting Point): The minimum level of soil moisture at which a plant wilts and cannot recover, also expressed as a percentage or fraction.
• BD (Bulk Density): The weight of the soil in a given volume, crucial for calculating the actual amount of water the soil can hold, typically expressed in grams per cubic centimeter (g/cm³).
• Soil Depth: The depth of the soil layer being analyzed, usually measured in centimeters or meters.

This calculation helps in understanding how much water is available to plants, not just the total moisture content of the soil.

Table of General Terms

To aid in understanding, here's a table defining terms related to the Available Water Capacity Calculator:

Example of Available Water Capacity Calculator

For instance, if a farmer wants to determine the AWC for a field with the following characteristics:

• Field Capacity (FC) = 25%
• Permanent Wilting Point (PWP) = 15%
• Bulk Density (BD) = 1.3 g/cm³
• Soil Depth = 30 cm

The calculation would be: AWC = (0.25 - 0.15) * 1.3 * 30 = 3.9 cm of water per square meter

This means each square meter of soil can hold 3.9 cm of water available for plant use, providing crucial data for effective irrigation planning.

Most Common FAQs

What is Available Water Capacity?

Available Water Capacity (AWC) is the volume of water that soil can store that is available for plant use, crucial for agricultural planning and water conservation efforts.

How does soil bulk density affect AWC?

Higher bulk densities usually indicate more compacted soil, which might hold less water available for plant roots. Affecting how water is stored and accessed in the soil profile.

Why is understanding AWC important for farmers?

Knowing the AWC helps farmers optimize irrigation practices, ensuring that crops receive adequate water without wastage and contributing to sustainable agricultural practices.