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Minimum Hourly Flow (MnHF) refers to the lowest volume of water passing a specific point in a river, stream, or through a water treatment system within a single hour. It is a critical parameter in water resource management and treatment system design.
The calculator uses the formula:
Where:
Explanation: This formula provides a simplified approach to estimate the minimum hourly flow based on the minimum daily flow for areas of moderate sizes, assuming a typical diurnal pattern.
Details: Accurate estimation of minimum hourly flow is crucial for designing water treatment systems, ensuring adequate water supply during low-demand periods, and maintaining system efficiency and reliability.
Tips: Enter the minimum daily flow value in cubic meters per second (m³/s). The value must be greater than zero for accurate calculation.
Q1: Why use 0.5 as the multiplier in the formula?
A: The 0.5 multiplier is an empirical factor that represents the typical relationship between minimum hourly flow and minimum daily flow for areas of moderate sizes, based on historical flow patterns.
Q2: What are typical applications of minimum hourly flow calculations?
A: This calculation is used in water treatment plant design, sewer system design, environmental flow assessments, and water resource planning.
Q3: How does this differ from average hourly flow?
A: Minimum hourly flow represents the lowest flow occurring in any hour, while average hourly flow represents the mean flow over a 24-hour period.
Q4: Are there limitations to this simplified formula?
A: Yes, this formula provides a general estimation and may not account for specific local conditions, extreme weather events, or unusual consumption patterns.
Q5: When should more complex methods be used instead?
A: For critical infrastructure design or in areas with unusual flow patterns, more detailed hydraulic modeling and historical data analysis should be employed.