Portage Inlet
Concerns
Pollution:
Portage Inlet is heavily affected by runoff from the impervious surfaces (i.e. roads, buildings, parking lots) in the surrounding area. Instead of soaking into the ground, rainwater runs across these surfaces and carries pollutants into the waterway. These include: oils, heavy metals, antifreeze and hydrocarbons from automobiles; pesticides and fertilizers washed off lawns and gardens; and cigarette butts thrown into street gutters. The Trans-Canada highway is very close to the northern end of Portage Inlet, and likely contributes significant runoff to the Inlet. Pollution is a concern for the survival of large Native Oyster beds and eelgrass meadows in the area.
Sedimentation:
Portage Inlet is a receiving basin for sediment that is carried by the two main streams from upland areas. This is a natural process. However, greater areas of impervious surfaces, as well as agricultural and construction practices, can lead to erosion. Soils and sediment washed off the surrounding land from erosion are eventually deposited in the Inlet. Accumulations of mud and sediment can cause more pollutants to accumulate in the inlet. If too much sediment accumulates, the inlet may eventually fill up. This problem was recognized back in the 1960s and 1970s, and various proposals were put forward to open up the inlet to more ocean water circulation, through canals or removing rock with explosives. However, such modifications would be very expensive, and would significantly alter the hydrology in the inlet. Reducing erosion may be more feasible and will also benefit the overall condition of the inlet and the streams that feed it. (See how can I help reduce erosion.)
Habitat Loss and Degradation:
Portage Inlet consisted of a mixture of rocky shorelines, erodible bluffs, intertidal mud flats and salt marsh before the area was developed. The roughness and complexity of rock outcrops greatly increase the available surface area, and provide nooks and crannies in which creatures can shelter, while soft sediments host a wide array of burrowing animals. Smooth surfaces such as seawalls provide little habitat in comparison. Many of these areas were filled in to increase the land base for development. This caused destruction of the underlying habitat. On the positive side, redevelopments of shoreline property represent opportunities for restoring natural habitat. (See how can I help – restore habitat on my property.)
