I've got a couple of other simple ones here some people might find useful:
Hydrant lead with a movable gate-valve.
Proposed spot elevation that reads Z-value
Drainage arrow with slope percentage.
(*added by mod: This post was split from its original thread in order to comply with new Sharing Forum guidelines*)
(*added by mod: Normally, I would have split all these blocks into their own separate threads ... but because all the posts in this thread reference these blocks, I felt it was best if the blocks all stayed together in order to maintain continuity*)