7. Layers

The Layers tab in the left panel controls how the map draws each kind of object, the underlay, and the results layers. Nothing here changes the model; the settings are saved in your preferences and the next session opens the same way.

7.1 Objects

One row per kind — rain gages, subcatchments, junctions, outfalls, dividers, storage units, conduits, pumps, orifices, weirs, outlets, labels — with:

• a visibility checkbox;
• a labels checkbox, drawing the object names of that kind;
• Symbol size, with reset;
• Map colour, an override of the theme's colour for that kind, with reset.

All on, All off and Defaults act on the whole list.

7.2 Map

• Flow arrows — a direction arrow on every link (also View → Flow Arrows).
• Grid — the snap grid (also View → Grid).
• Object labels (all) — every kind's labels at once (also View → Object Labels).

7.3 Underlay

• PNG — the loaded image's name, an opacity slider, Remove PNG, Load PNG… (also File → Load PNG Background…).
• DXF — the loaded drawing's name, Remove DXF, Load DXF… (also File → DXF Underlay…).

Both are the storm-sewer workspace's drawing aids, placed by their own scaling and not stored in the .inp. The model's own georeferenced image — SWMM's [BACKDROP], placed from a world file — is a separate thing, controlled from View → Backdrop (§3.9).

7.4 Results

Empty until a run has finished, then:

• Node results and Link results — turn the coloured overlay on the editing map on and off, per kind;
• Legend — show or hide the five-class legend and the frame timestamp in the map's corner.

Which variable colours the map, the class breaks, playback and the query tool are in the Results view (chapter 10); the layers tab only switches the overlay. With the overlay on, the map you edit is the map that shows the results, so a node's colour and its Properties are one click apart.