Adding Drains to a SlabAdding Drains to a Slab
To add drains to a slab:
Select the slab object.
Click the Slab Drainage tool from the Building Shell tool set, and click Settings from the Tool bar.
The Slab Drainage Settings dialog box opens.
Set the default Slab Drainage Settings for this slab and click OK. Some of these individual settings can be edited later using the Slab Drainage tool’s Edit mode (see Editing Slab Drainage Elements).
Click Create Drain mode from the Tool bar.
As you move the cursor over the slab, special snap points display to allow easier placement of drains with a constant height curb. You do not have to place the drain on a snap point, but if a drain is placed at a snap point on a slab with no existing drains, the resulting slopes have a constant height for at least some of the edges that extend from the indicated corners.
For the curb height to be constant along an edge, the slope of the slab must be perpendicular to that edge along its entire length. For any two neighboring edges to have constant height, the slab slope must change at the corner between the edges, and a valley will be present. Curb heights are a product of overall slab and slab drainage geometry; curbs cannot be directly edited using the Slab Drainage tool.
Click inside the selected slab to place the drain.
A drain is placed, along with related slope valleys in the four diagonal directions; slope valleys are always oriented diagonally, even in rotated plan view. Automatically added slope markers indicate the direction and angle of the slope.
For slabs with a sloping component, the drain’s height is set relative to the top of the sloping component; for slabs where the entire structure slopes, the drain’s height is relative to the base height of the slab. See Creating Slab Styles to indicate whether the slab has a sloping component or the entire slab slopes.
It is possible for a drain to be placed such that no surfaces drain into it. It is the designer’s responsibility to correct this; the only indication of this is that the drain does not affect the slab’s geometry.
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