Stormwater Management Standards Manual - Toledo Metropolitan ...

Watercourse
A natural or artificial waterway, such as a stream or river, with a defined bed and channel and a definite
direction of course that is contained within, flows through, or borders the community.
Watershed
The complete area or region of land draining into a common outlet such as a river or body of water.
Weir
A structure that extends across the width of a channel, and is used to impound, measure, or in some
way alter the flow of water through the channel.
Wetland
Land characterized by the presence of water at a frequency and duration sufficient to support and that
under normal circumstances does support wetland vegetation or aquatic life and is commonly referred to
as a bog, swamp, or marsh. A wetland will contain predominance, not just an occurrence, of wetland
vegetation and hydric soils.
Category 2 wetland
A medium quality wetlands classification as defined in Ohio Administrative Code (OAC) Rule 3745-1-
54© of the Ohio EPA.
Category 3 wetland
A high quality wetlands classification as defined in Ohio Administrative Code (OAC) Rule 3745-1-54© of
the Ohio EPA.
Wetland Mitigation
A regulatory term that refers to the process of constructing new wetland acreage to compensate for the
loss of natural wetlands during the development process. Mitigation seeks to replace structural and
functional qualities of the natural wetland type that has been destroyed. Stormwater wetlands typically
do not count for credit as mitigation, because their construction does not replicate all the ecosystem
functions of a natural wetland.
Wet Pond
A pond structure that provides for the storage of runoff by means of a permanent pool of water.
Wetted Perimeter
The wetted surface of a stream, culvert cross-section, or pond that causes resistance to flow. The water
to surface interface is a distance, typically expressed in feet.
Third Edition Stormwater Standards Manual September 2008 Page 153