Calculate the ratio of nearby shoreline areas and water beds that are naturalized
compared to engineered for freshwater streams, lakes, wetlands, and marine areas in
the city. All streams of at least fourth order in size and wetlands or lakes of at least 4
hectares in area should be included.
Naturalized shorelines include natural vegetated porous surfaces such as
soil/sandy/rocky shores, beds, and tidal pools and includes restored or artificial
shorelines with the same characteristics. Include the area from the bank at the high
water mark as well as the underwater bed or subsurface.
Engineered shorelines include hardscape such as concrete or riprap edge, mowed
lawn, channelized, or culverted. Stream or lake beds and underwater sub-surfaces that
have been hardened, dredged, filled, dammed, drilled, mined, tunnelled, undergone
bottom trawling, or otherwise altered without restoration are also considered to be
engineered.
In the case of streams, calculate both sides of the stream bank including the condition
of the stream bed between the banks as one-unit equivalent in length to a single marine
or other type of shoreline.
In the case of lakes, calculate naturalized shorelines that are also adjacent to
naturalized lake beds as natural.
In the case of coastal areas, calculate the shoreline from high tide as well as adjacent
associated ecosystems (mangrove forests, tidal pools, beaches) and the condition of
the associated subsurface bed extending until the shelf break. Naturalized coastal
shorelines must feature a substantially natural tidal area and bed to be included as
naturalized. Substantially natural means that natural ecosystems cover the majority of
the area and any human interventions such as pedestrian pathways have minimal
impact (for example, vehicular roadways running along the shoreline are not
substantially natural, but a public pedestrian beachfront with raised platforms to protect
dunes and nesting areas could be substantially natural).

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