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The Storage at Beginning of Time Interval calculation determines the initial amount of water stored in reservoirs within a hydrological system by considering the storage at the end of the time interval and the change in storage volumes that occurred during that period.
The calculator uses the formula:
Where:
Explanation: This formula calculates the initial storage by subtracting the change in storage volumes from the final storage value.
Details: Accurate storage calculation is crucial for water resource management, hydrological modeling, and understanding water balance in reservoir systems over specific time intervals.
Tips: Enter the storage at the end of the time interval and the change in storage volumes. Both values should be in consistent units. The storage at the end must be a non-negative value.
Q1: What units should I use for the inputs?
A: Use consistent units for both inputs (e.g., cubic meters, acre-feet, or any volume unit). The result will be in the same units.
Q2: Can the change in storage volumes be negative?
A: Yes, a negative ΔSv indicates a net decrease in storage during the time interval, while a positive value indicates a net increase.
Q3: What if I get a negative result for S1?
A: A negative S1 value may indicate an error in input data as storage cannot be physically negative. Please verify your inputs.
Q4: How precise should my measurements be?
A: The precision depends on your specific application. For most hydrological studies, measurements should be accurate to at least three significant figures.
Q5: Can this formula be used for other types of storage besides water?
A: While designed for hydrological applications, the same mathematical principle can be applied to any storage system where the beginning value equals the ending value minus the change.