1. What is Inglis' Formula?

Inglis' Formula is used to estimate runoff depth in inches for non-ghat areas. It calculates the portion of precipitation that flows over the land surface into streams, rivers, or other water bodies based on rainfall depth.

2. How Does the Calculator Work?

The calculator uses Inglis' Formula:

Where:

• \( RII \) — Runoff Depth in Inches for Inglis' Formula
• \( RPI \) — Rainfall Depth in Inches

Explanation: The formula calculates runoff depth by subtracting 7 from the rainfall depth, dividing by 100, and then multiplying by the original rainfall depth.

3. Importance of Runoff Calculation

Details: Accurate runoff estimation is crucial for water resource management, flood prediction, irrigation planning, and environmental impact assessment in non-ghat areas.

4. Using the Calculator

Tips: Enter rainfall depth in inches. The value must be valid (greater than 0).

5. Frequently Asked Questions (FAQ)

Q1: What are non-ghat areas?
A: Non-ghat areas refer to regions that are not located near mountain ranges or hilly terrains, typically characterized by flatter landscapes.

Q2: When is Inglis' Formula most accurate?
A: Inglis' Formula provides better accuracy for moderate rainfall conditions in non-ghat areas with typical soil absorption characteristics.

Q3: What factors affect runoff depth?
A: Soil type, vegetation cover, land slope, and antecedent moisture conditions significantly influence runoff depth calculations.

Q4: Are there limitations to this formula?
A: The formula may be less accurate for extreme rainfall events, areas with unusual soil composition, or regions with significant urban development.

Q5: How does this differ from other runoff formulas?
A: Inglis' Formula is specifically designed for non-ghat areas and uses a simplified approach compared to more complex hydrological models.