1. What is Volume Of Water Retained?

Volume of water retained refers to the capacity of water that remains in a porous medium (such as soil or rock) after it has been drained by gravity. It is an important parameter in hydrogeology and soil science.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W_r \) — Volume of water retained (m³)
• \( V \) — Total volume (m³)
• \( \%S_r \) — Specific retention percentage (%)

Explanation: The formula calculates the volume of water that remains in the porous medium by multiplying the total volume with the specific retention percentage and dividing by 100.

3. Importance of Water Retention Calculation

Details: Calculating water retention is crucial for understanding groundwater storage, designing drainage systems, and assessing the water-holding capacity of soils and geological formations.

4. Using the Calculator

Tips: Enter total volume in cubic meters and specific retention percentage (0-100%). Both values must be valid (volume > 0, percentage between 0-100).

5. Frequently Asked Questions (FAQ)

Q1: What is specific retention?
A: Specific retention is the ratio of the volume of water that a rock or soil can retain against gravity to the total volume of the rock or soil, expressed as a percentage.

Q2: How does specific retention differ from specific yield?
A: Specific yield refers to the volume of water that drains by gravity, while specific retention refers to the volume of water retained against gravity.

Q3: What factors affect water retention in soils?
A: Soil texture, organic matter content, soil structure, and compaction all influence water retention capacity.

Q4: Why is water retention important in agriculture?
A: Water retention affects irrigation requirements, drought resistance, and overall plant growth and productivity.

Q5: How is specific retention measured in practice?
A: Specific retention is typically determined through laboratory tests on soil or rock samples, measuring the amount of water retained after drainage.