Calculate the ratio of naturalised to engineered shoreline areas 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 ha in area should be included.

Naturalised shorelines include naturally vegetated porous surfaces such as soil/sandy/rocky shores, beds, and tidal pools and include 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, channelised, 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, count 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, count naturalised shorelines that are also adjacent to naturalised lake beds as naturalised shoreline area.

In the case of coastal areas, consider 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. Naturalised coastal shorelines must feature a substantially natural tidal area and bed to be included as naturalised. Substantially natural means that natural ecosystems cover the majority of the area and any human interventions such as pedestrian pathways have minimal impact (e.g. 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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