departure chart question-Tucson intl

[cheapfuel]

KTUS--- BURRO TWO DEPARTURE chart :
In the ' Take-off obstacle notes ' there is reference to ""Multiple bushes and vent 1126' from DER"" etc etc etc. I know what a bush is, but have no idea what a 'vent' is. Additionally, what the heck is DER ? Thanks ahead--

[TopBunk]

I believe that DER = Departure End of Runway, ie the far end.

Vent, is probably some gas vent that may produce some gaseous output on accasion.

Having said that, the Aerad cgart for that departure mentions neither.