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The permissible closing error for rough levelling is a measure of the acceptable error in levelling surveys. It represents the maximum allowable discrepancy when closing a levelling circuit, calculated based on the distance between two points.
The calculator uses the formula:
Where:
Explanation: The formula calculates the permissible closing error by taking the square root of the distance between two points and multiplying it by 100. This accounts for the expected error accumulation over distance in rough levelling surveys.
Details: Calculating permissible closing error is crucial for ensuring the accuracy and reliability of levelling surveys. It helps surveyors determine if their measurements are within acceptable tolerances and whether the survey results can be considered valid.
Tips: Enter the distance between two points in meters. The value must be positive and greater than zero. The calculator will compute the permissible closing error for rough levelling.
Q1: What is rough levelling?
A: Rough levelling is a type of surveying that provides approximate elevation differences with lower precision requirements compared to precise levelling methods.
Q2: Why is the formula e = 100√D used?
A: This formula is an empirical relationship that accounts for error accumulation over distance in rough levelling surveys, providing a practical tolerance limit.
Q3: What units are used in this calculation?
A: Both distance and closing error are measured in meters (m).
Q4: When should this calculation be applied?
A: This calculation should be used when conducting rough levelling surveys to determine if the measured closing error is within acceptable limits.
Q5: What if the actual error exceeds the permissible error?
A: If the actual error exceeds the permissible error, the survey should be repeated to identify and correct the source of the excessive error.