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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.
The calculator uses the formula:
Where:
Details: Calculating minimum hourly flow is crucial for designing wastewater treatment systems, ensuring proper system operation during low-flow periods, and maintaining treatment efficiency.
Tips: Enter the average daily flow in cubic meters per second. The value must be valid (greater than 0).
Q1: Why is the minimum hourly flow calculated as one-third of the average daily flow?
A: This ratio is based on empirical observations and engineering standards that account for typical diurnal variations in wastewater flow patterns.
Q2: When is minimum hourly flow most likely to occur?
A: Minimum hourly flow typically occurs during early morning hours (2-5 AM) when water usage is at its lowest.
Q3: How does minimum hourly flow affect treatment plant design?
A: Treatment plants must be designed to handle both peak and minimum flows to maintain treatment efficiency and prevent system failures.
Q4: Are there variations in this ratio for different types of systems?
A: Yes, the ratio may vary depending on population density, industrial contributions, and specific system characteristics.
Q5: What other factors should be considered alongside minimum hourly flow?
A: Peak hourly flows, seasonal variations, and infiltration/inflow should also be considered for comprehensive system design.