Urban waterfall

An urban waterfall is a natural waterfall located in an urban area that has some man-made changes done to it, such as enclosing the natural creek above or below the falls into a storm sewer or box culvert or the construction of a bridge or road over the creek above the falls. The actual waterfall itself normally has not changed, just its natural surroundings have been changed by man.

Dundas Falls located in Hamilton Canada is an urban waterfall because Spencer Creek above the falls has been enclosed into a large storm sewer pipe as shown on this link:
http://www.conservationhamilton.ca/parks/visit/dundasfalls.asp
(copy and paste)

Urban waterfall by Mr. Hamilton Waterfall March 27, 2009

Urban Waterfall

A constant flow of rainwater caused by overflowing spouting and/or guttering.

most commonly seen in schools and blocked gutters.

-"What a skody school"
-"I know their such a beautiful freak of nature"
-"what are?"
-"urban waterfalls"

Urban Waterfall by SAMTHEMAN177 June 16, 2010

Sub-Urban Waterfall 

The act of urinating inside a prolapsed anus.

Man I totally gave this chick a Sub-Urban Waterfall last night!

Sub-Urban Waterfall by Fandy188 February 14, 2012