"Obstruction" includes, but is not limited to, any dam, wall, wharf, embankment, levee,
dike, pile, abutment, protection, excavation, channelization, bridge, conduit, culvert,
building, wire, fence, rock, gravel, refuse, fill, structure, vegetation or other
material in, along, across or projecting into any watercourse which may alter, impede,
retard or change the direction and/or velocity of the flow of water, or due to its
location, its propensity to snare or collect debris carried by the flow of water,
or its likelihood of being carried downstream.
