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Lacey's Formula:
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Monsoon Duration Factor refers to the period during which monsoon rains occur in a specific region. It depends on the monsoon rains and is a crucial parameter in hydrological calculations for monsoon-affected areas.
The calculator uses Lacey's Formula:
Where:
Explanation: The formula calculates the monsoon duration factor based on catchment characteristics, runoff depth, and rainfall depth using Lacey's established hydrological principles.
Details: Accurate calculation of monsoon duration factor is essential for water resource management, flood prediction, irrigation planning, and hydrological modeling in monsoon-affected regions.
Tips: Enter catchment factor (S), runoff depth in inches (RLI), and rainfall depth in inches (RPI). All values must be positive numbers greater than zero.
Q1: What is the catchment factor (S)?
A: Catchment Factor refers to topography, shape, size, soil type, and land use (paved or roofed areas) of the watershed area.
Q2: How is runoff depth measured?
A: Runoff Depth refers to the portion of precipitation or irrigation that flows over the land surface into streams, rivers, or other water bodies, typically measured in inches.
Q3: What is the typical range for monsoon duration factor?
A: The monsoon duration factor varies by region and specific catchment characteristics, but typically ranges between 0.5 to 2.0 for most monsoon-affected areas.
Q4: Why is the negative sign in the denominator?
A: The negative sign in the formula accounts for the mathematical relationship between the variables and ensures the monsoon duration factor is calculated correctly based on Lacey's derivation.
Q5: Can this formula be used for non-monsoon regions?
A: While specifically designed for monsoon conditions, the formula can be adapted for other rainfall patterns, though results may need validation for non-monsoon regions.