The amount of water in the soil before rainfall is called?

• A. Antecedent soil moisture
• B. Field capacity
• C. Soil moisture deficit
• D. Soil moisture surplus

Answer: (A)

The amount of water in the soil before rainfall is called antecedent soil moisture. This term describes the soil’s initial water content, which shapes what happens when rain arrives. If the soil is already fairly moist (high antecedent moisture), there’s less capacity to absorb new water, so rainfall is more likely to run off or drain quickly rather than infiltrate deeply. If the soil is dry (low antecedent moisture), rainfall can infiltrate more readily and replenish moisture for plants and groundwater. Field capacity, by contrast, is the maximum water the soil can hold after drainage; soil moisture deficit is how much water is needed to reach that capacity, and soil moisture surplus is when moisture temporarily exceeds that capacity and drainage or runoff occurs.