It's not uncommon to run in to standing water during or after rainfall in my area. It ranges from a few inches to well over one foot at times, and sometimes unavoidable (ie leaving a parking lot with no other way out).
What kind of water wading capability is the Q5 able to tackle?
I'm assuming this will vary depending on whether you're driving a 2.0T/3.0T/TDI.
Euro SQ5 says 170mm, equal to the ground clearance... Not sure why. So far I can only assume the fancy exhaust actuator doesn't like getting wet...
Not sure what the US spec SQ5 says, be interesting to see if its 200mm (as it's not lowered 30mm compared to euro).