1. What is the Inglis Formula?

The Inglis Formula is an empirical equation used to estimate flood discharge in cubic feet per second (cfs) based on the area of the drainage basin. It provides a simplified approach for flood estimation in hydrological studies.

2. How Does the Calculator Work?

The calculator uses the Inglis Formula:

Where:

• \( Q_{IF} \) — Flood discharge in cubic feet per second (cfs)
• \( A \) — Area of basin in square miles

Explanation: The formula relates flood discharge directly to the basin area, with a square root adjustment factor to account for non-linear relationships in hydrological processes.

3. Importance of Flood Discharge Calculation

Details: Accurate flood discharge estimation is crucial for designing hydraulic structures, floodplain management, disaster preparedness, and water resource planning.

4. Using the Calculator

Tips: Enter the basin area in square miles. The value must be a positive number greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the limitations of the Inglis Formula?
A: The formula is empirical and may not account for regional variations in rainfall patterns, topography, soil types, or land use characteristics.

Q2: When is the Inglis Formula most appropriate?
A: It's best suited for preliminary estimates and smaller watersheds where more complex hydrological data may not be available.

Q3: How does this formula compare to other flood estimation methods?
A: The Inglis Formula provides a simplified approach compared to more comprehensive methods like rational method or unit hydrograph techniques.

Q4: What units should the basin area be in?
A: The formula requires basin area in square miles for accurate results in cubic feet per second.

Q5: Can this formula be used for large river basins?
A: While it can provide estimates, more sophisticated methods are recommended for large or complex river basins.