1. What is Runoff Volume Percentage?

Runoff Volume Percentage for different antecedent moisture condition (AMC) represents the proportion of rainfall that becomes surface runoff rather than infiltrating into the soil or being lost to evaporation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Ks \) — Runoff Volume Percentage (%)
• \( p \) — Daily Rainfall (mm)

Explanation: This linear regression formula estimates the percentage of rainfall that will become runoff under dry antecedent moisture conditions.

3. Importance of Runoff Volume Calculation

Details: Accurate runoff volume estimation is crucial for hydrological modeling, flood prediction, water resource management, and urban drainage system design.

4. Using the Calculator

Tips: Enter daily rainfall in millimeters. The value must be valid (rainfall > 0).

5. Frequently Asked Questions (FAQ)

Q1: What are antecedent moisture conditions (AMC)?
A: AMC refers to the moisture content of the soil before a rainfall event, which significantly affects how much rainfall becomes runoff.

Q2: What is considered "dry" AMC?
A: Dry AMC typically occurs when there has been little to no rainfall for an extended period, resulting in dry soil conditions with higher infiltration capacity.

Q3: How accurate is this formula?
A: This is an empirical formula that provides reasonable estimates for dry conditions, but actual results may vary based on specific soil types and local conditions.

Q4: When should this formula be used?
A: This formula is particularly useful for hydrological modeling and water resource planning in regions with dry antecedent moisture conditions.

Q5: Are there limitations to this equation?
A: Yes, this formula may be less accurate for extreme rainfall events, different soil types, or areas with significant vegetation cover.