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Intensity of Rain for Intensity Duration Curve Equation:
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The Intensity of Rain for Intensity Duration Curve describes the relationship between rainfall intensity, duration, and frequency. It is used in hydrology and civil engineering for designing drainage systems and flood protection infrastructure.
The calculator uses the Intensity Duration Curve equation:
Where:
Explanation: The equation models the relationship between rainfall intensity and duration, where intensity decreases as duration increases.
Details: Accurate rainfall intensity calculation is crucial for designing stormwater drainage systems, culverts, and other hydraulic structures to handle extreme rainfall events and prevent flooding.
Tips: Enter K constant in mm/hr, time in minutes, and empirical constant b in minutes. All values must be valid positive numbers.
Q1: What are typical values for K constant?
A: K constant values vary by region and climate, typically ranging from 50 to 200 mm/hr depending on local rainfall patterns.
Q2: How is empirical constant b determined?
A: Empirical constant b is derived from historical rainfall data analysis and varies based on geographical location and climate characteristics.
Q3: What time durations are typically used?
A: Common durations range from 5 minutes to 24 hours, with shorter durations used for small catchment areas and longer durations for larger watersheds.
Q4: How accurate is this equation?
A: The equation provides a good approximation for many regions but should be calibrated with local rainfall data for optimal accuracy.
Q5: What are the main applications of intensity-duration curves?
A: Main applications include urban drainage design, flood risk assessment, stormwater management, and hydraulic structure design.