Specifies the soil stiffness in the upward direction on a stiffness per length basis. The value that you enter is the stiffness that will resist upward displacement of the pipeline. This option is required if Soil Model No. is set to 1; otherwise, you can leave this option blank.
The smallest allowable non-zero value is 0.5.
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If the upward and downward stiffnesses are equal, then you need only enter a value for one--the stiffness value that is not entered defaults to the stiffness value that is entered.
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If both User-Defined Upward Stif and User-Defined Downward Stif are set to 0 or left blank, the software returns a fatal error.