1. What is Time of Peak?

Time of Peak is the time interval from the start of rainfall to the peak discharge in a hydrograph. It represents the time taken for the maximum flow rate to occur in a watershed after a rainfall event.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T_p \) — Time of Peak (seconds)
• \( T_c \) — Time of Recession (seconds)
• 1.67 — Empirical constant

Explanation: This formula establishes a relationship between the time of recession and the time of peak discharge based on empirical observations in hydrology.

3. Importance of Time of Peak Calculation

Details: Calculating time of peak is crucial for flood forecasting, watershed management, and designing drainage systems. It helps predict when maximum flow will occur, allowing for better preparation and mitigation measures.

4. Using the Calculator

Tips: Enter the time of recession in seconds. The value must be greater than zero. The calculator will compute the corresponding time of peak using the established empirical relationship.

5. Frequently Asked Questions (FAQ)

Q1: What is Time of Recession?
A: Time of Recession represents the withdrawal of water from the storage built up in the basin during the earlier phases of the hydrograph.

Q2: Why is the constant 1.67 used in the formula?
A: The constant 1.67 is an empirical value derived from hydrological studies and observations of watershed behavior.

Q3: How accurate is this calculation?
A: The accuracy depends on the specific watershed characteristics and should be used as an estimation tool rather than an exact measurement.

Q4: Can this formula be applied to all watersheds?
A: While the formula provides a general relationship, specific watershed characteristics may require adjustments to the constant value.

Q5: What units should be used for input values?
A: Both time of recession and time of peak are measured in seconds for consistency in the calculation.