EPA On-line Tools for Site Assessment Calculation
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Gradient From Three Points
With data from three points the magnitude and direction of the gradient can be determined. X, Y locations and the measured heads give a matrix for determining the gradient and direction:
where a, b, and c are the coefficients of a plane that goes through the three points. The magnitude of the gradient is dermined from
and the angle with North (=0o) is, for example in the first quadrant
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