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Ponded Water

If a Water Table is defined with elevation above the ground surface, Ponded Water is automatically assumed to exist in the region between the Water Table and the External slope geometry.

Ponded Water affects the slope stability calculations, by the weight of the water on the slope (vertical force), and also by the horizontal hydrostatic force exerted on the slope. The Water Unit Weight in Project Settings determines the vertical and horizontal forces generated by the Ponded Water.

Groundwater Method

A Water Table can be used to define Ponded Water regardless of the Groundwater Method (i.e., Water Surfaces, Ru, Water Grids).

  • If the Groundwater Method is set to Ru Coefficient or Water Grids in Define Material dialog, then the Water Table is NOT used to calculate Pore Pressure but will be used to define Ponded Water.
  • If the Water Pressure Method is set to Material Dependent, Constant, Dry, or Water Grids in Define Joint Properties dialog, then the Water Table is NOT used to calculate Joint Water Pressure but will be used to define Ponded Water.

When you define a Water Table with elevation above the ground surface, ponded water is automatically used in the stability analysis regardless of the:

  • Groundwater Method assignment in Define Materials dialog.
  • Water Pressure Method assignment in Define Joint Properties dialog.

Display of Ponded Water

Ponded Water is currently NOT displayed in the RocSlope modeler. The RocSlope engine automatically accounts for the Ponded Water forces when the Water Table elevation is above the slope. But the Ponded Water is not explicitly displayed on the model.

Piezometric Surfaces

Ponded Water is NOT created by Piezometric Surfaces, even if they are drawn above the slope geometry. Ponded Water is only defined by a Water Table when drawn above the slope geometry.

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