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Time Interval Formula:
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The Time Interval formula calculates the time required for hydrological changes based on inter-isochrone area and inflow rate. It's commonly used in watershed management and flood prediction studies to determine translation times of runoff.
The calculator uses the Time Interval formula:
Where:
Explanation: The formula calculates the time interval by multiplying the constant 2.78 with the ratio of inter-isochrone area to inflow rate.
Details: Accurate time interval calculation is crucial for watershed management, flood prediction, and hydrological modeling. It helps in understanding runoff translation times and planning appropriate water management strategies.
Tips: Enter inter-isochrone area in square meters and inflow rate in cubic meters per second. Both values must be positive numbers greater than zero.
Q1: What is inter-isochrone area?
A: Inter-isochrone area divides a watershed into subareas with distinct runoff translation times, helping in hydrological analysis and flood prediction.
Q2: Why is the constant 2.78 used in the formula?
A: The constant 2.78 is a conversion factor that accounts for unit conversions and empirical relationships in hydrological calculations.
Q3: What are typical values for inflow rate?
A: Inflow rates vary significantly based on watershed characteristics, rainfall intensity, and land use. They can range from small fractions to hundreds of cubic meters per second.
Q4: Can this formula be used for all watershed types?
A: While generally applicable, the formula may need adjustments for extremely large or small watersheds, or those with unique hydrological characteristics.
Q5: How accurate is this calculation method?
A: The method provides a good estimate for most practical purposes, but for critical applications, more detailed hydrological modeling may be required.