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Given that evaporated toilet bowl (pan) water leads to sewer gas in the house, just dump a bucket or two of water in there as your first step. There's no wrong way to do that, nothing to damage by doi …

It's preventing air movement through the drain pipe. … So, it's doing exactly what you understand, but your understanding was perhaps limited to the case of "sewer gas" while in this case that's handled beyond the air-gapped drain, and the "gas" being prevented …

Tape it. You are not proposing this kludge as a permanent fix. That's good. The wrap-tape products are good for an emergency bodge, and that's what you are proposing, on a temporary basis. The problem …

The pipe won't wear out from 20,000 gallons of water, or 2,000,000 gallons, if that's what you're asking. It may take as much as 3 weeks to pump out, though, since you can't exceed the gravity flow ra …

If you put the pipe right on the fabric, you'll end up filtering the inflow through the 1/2" circles of fabric pressed up against the holes in the pipe, as opposed to filtering through all the fabric …

That is a bone stock "bell-trap" floor drain. …

Drain pipe sizes stay the same or get larger in the direction of flow - never smaller. A golf-ball sized hunk of wax is much smaller than 3" - otherwise it couldn't have fallen in the pipe. …

When you bend the outlet of a P trap down (before hitting a drain pipe with a vent), you make an S trap, and S traps siphon themselves dry with ease. … You might be able to lower the trap (by extending the sink drain connection downwards, and rearranging other pipes to fit) to the point where it would actually be a P trap. …

Even if someone was "working on the sewer lines with a vacuum" properly sized and functional vents would keep the traps from siphoning. So, you have vents which are not functioning as they should, whe …

That is a drum trap. [Evidently also called a bottle trap in some parts of the world, per comments] They are rather old school, and out of favor in code now. I'm more used to finding them embedded in …

Given where that plug seals, cleaning all the crud from the sidewalls of the drain hole may be most of what's needed to make it seal properly. …

You will have to provide it with water and a drain that meets code - and it's not at all likely that you can run 17 feet to join the sink drain while meeting code. … So you'll have to arrange plumbing to serve the water input and drain output needs of the dishwasher where you want to put it, independent of the sink. …

Because the standard tub drain has a sharp right-angle T junction where the overflow and tub drain meet (this is also where the stopper is located if the stopper is operated by a lever on the overflow … plate, as opposed to an in-the-tub stopper or rubber stopper over the drain.) …

The sink tailpiece should be extended and the trap lowered so that the exit of the trap is 1/4" per foot of pipe higher than the entrance of the wall drain, not several inches above the drain entrance … Not great, the angle is such that the green (trying to show going directly to the drain) and the purple (trying but mostly failing to show "back to the wall and turn to follow the wall to the drain" look …

You can use something like the non-toxic RV antifreeze which evaporates more slowly than water; Or wash the basement floor occasionally. A touch of mineral oil (the stuff sold for putting in people) …