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VH400 Piecewise Curve
Most curves can be approximated with linear segments of the form:
where m is the slope of the line
The VH400's Voltage to VWC curve can be approximated with 4 segents of the form:
where V is voltage.m= (VWC2 - VWC1)/(V2-V1)
where V1 and V2 are voltages recorded at the respective VWC levels of VWC1 and VWC2.
After m is determined, the y-axis intercept coefficient b can be found by inserting one of the end points into the equation:
Most soils have a holding capacity of less that 50%, so the curves stop at 2.2V which represents 50% VWC. Above 50% you can use an approximation as follows: