Slope (fall) mark
ISO 10628-2 (group 25) / PIP PIC001 (line conventions)
Drawn as
The word "SLOPE" or a ratio (e.g. 1:100) with an arrow along the line pointing downhill.
Meaning
The line must fall continuously in the arrow direction: drains, flare headers and relief lines (no pockets). Affects routing, not components. Keep runs level or falling towards the drum.
Variants
- Some legends use a small right triangle above the line
- "No pockets" or "free draining" notes mean the same
Not physical hardware. Read it, then skip it in the 3D model.