There needs to be a "Apply Minimum cover" in the Pipe Rules for easy waterline creation.
Having this capability would allow the user to quickly layout a waterline with minimum cover based off the surface. The waterline would typically have a simple structure a maximum 20ft symbolizing a union or tee or something. At each of these structures the minimum cover will set the initial inverts of the pipe segments. Then, only minor editing can be done at interferences.

With this there should be a toggle to define by slope (whether down or up) or by minimum cover.

Jonathan Stewart