Breach Depressions ‘Breach Depressions’ allows you to break through a depression and allow water to flow out. ’Layer to breach’ selects which surface layer the breaching should be applied to.  ‘Transparency’  of the design can be altered using the slider.  ‘Output new surface’ will create a new design layer. ‘Modify existing surface’ will make breaching changes to the selected surface. ‘Create breach paths as polylines on close’ by selecting this option polylines will be generated according to the ‘Min path length’.