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Creager's Formula:
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Creager's Formula is an empirical equation used to estimate peak flood discharge from a drainage basin. It considers the basin area and a regional constant to predict flood volumes for hydrological analysis and flood management planning.
The calculator uses Creager's Formula:
Where:
Explanation: The formula establishes a relationship between basin area and peak flood discharge, with the Creager Constant adjusting for regional hydrological characteristics.
Details: Accurate flood discharge estimation is crucial for designing hydraulic structures, floodplain management, disaster preparedness, and water resource planning. It helps in determining the capacity requirements for bridges, culverts, and drainage systems.
Tips: Enter the Creager Constant (typically ranges from 30-100 based on regional characteristics) and the basin area in square meters. Both values must be positive numbers.
Q1: What is the typical range for Creager Constant?
A: The Creager Constant typically ranges from 30 to 100, with higher values indicating regions with more intense rainfall and runoff characteristics.
Q2: How accurate is Creager's Formula?
A: Creager's Formula provides reasonable estimates for preliminary flood studies but should be verified with local hydrological data and more sophisticated methods for critical applications.
Q3: What units should be used for basin area?
A: The formula requires basin area in square meters. For areas measured in other units, conversion to square meters is necessary before calculation.
Q4: Are there limitations to Creager's Formula?
A: Yes, the formula is empirical and may not account for all basin characteristics such as slope, soil type, land use, or rainfall intensity variations.
Q5: When should Creager's Formula be used?
A: It's suitable for preliminary flood estimation, small to medium watersheds, and regions where more detailed hydrological data is unavailable.