Constant Used in FPS Unit when Flood Discharge by Creager's Formula Calculator

Creager's Formula:

\[ C_c = \frac{Q_c}{46 \times A_1^{0.894 \times A_1^{-0.084}}} \]

Creager Constant (Cc):

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1. What is the Creager Constant?

The Creager Constant refers to an empirical coefficient used in Creager's formula to estimate peak flood discharge, adjusting for regional hydrological characteristics. It is a crucial parameter in flood analysis and watershed management.

2. How Does the Calculator Work?

The calculator uses Creager's formula:

\[ C_c = \frac{Q_c}{46 \times A_1^{0.894 \times A_1^{-0.084}}} \]

Where:

\( C_c \) — Creager Constant
\( Q_c \) — Flood Discharge by Creager's Formula (m³/s)
\( A_1 \) — Area of Basin (m²)

Explanation: The formula calculates the Creager Constant based on flood discharge and basin area, incorporating empirical coefficients for regional hydrological adjustments.

3. Importance of Creager Constant Calculation

Details: Accurate calculation of Creager Constant is essential for flood prediction, watershed management, and hydraulic engineering design. It helps in estimating peak flood discharges for different basin areas.

4. Using the Calculator

Tips: Enter flood discharge in m³/s and basin area in m². Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of Creager Constant values?
A: Creager Constant values typically range from 10 to 100, depending on regional hydrological characteristics and basin properties.

Q2: How does basin area affect the Creager Constant?
A: Larger basin areas generally result in higher Creager Constant values, as the formula incorporates area-dependent exponential factors.

Q3: Can this formula be used for all types of watersheds?
A: While Creager's formula is widely applicable, it works best for medium to large watersheds and may require regional calibration for specific hydrological conditions.

Q4: What are the limitations of Creager's formula?
A: The formula may be less accurate for very small or very large watersheds, and in regions with unusual hydrological patterns or extreme weather conditions.

Q5: How often should Creager Constant be recalculated?
A: The constant should be recalculated when significant changes occur in the watershed, such as land use changes, urbanization, or major hydraulic modifications.