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One of the most exciting new trends in water quality management today is the movement

by many cities, counties, states, and private-sector developers toward the increased use of

Low Impact Development (LID) to help protect and restore water quality. LID comprises

a set of approaches and practices that are designed to reduce runoff of water and

pollutants from the site at which they are generated. By means of infiltration,

evapotranspiration, and reuse of rainwater, LID techniques manage water and water

pollutants at the source and thereby prevent or reduce the impact of development on

rivers, streams, lakes, coastal waters, and ground water.
OGS are available under a variety of trade names and have been widely applied across the U.S. and Canada.  Two of the most common varieties of OGS installed in Ontario cities during the 1990s are the traditional 3-chamber OGS and a proprietary device called Stormceptor®.  Although the designs of the OGSs are very different, both devices function on principles of sedimentation for suspended solids and phase separation for oils and grease.

The 3-chamber and Stormceptor® OGS monitored under the SWAMP program were both applied to parking lots of a large hardware chain.  The monitoring program involved continuous measurements of flow and water quality over a one and a half year period between 1997 and 1998.  A brief review of literature on OGS technologies and maintenance requirements was also conducted as part of the study.

For detailed monitoring results on this project, see the report entitled Performance Assessment of Two Types of Oil and Grit Separator for Stormwater Management in Parking Lot Applications – Markham & Toronto, Ontario

Homepage: http://www.sustainabletechnologies.ca/portal/alias__Rainbow/lang__en/tabID__153/Default.aspx

The Toronto-Niagara Region (TNR) Study on Atmospheric Change is a research project

coordinated by Environment Canada’s Adaptation and Impacts Research Group with the

support of several partners and many corresponding stakeholders. The primary goal of the

TNR Study is to work with decision-makers and the research community to develop an

improved and integrated understanding of how this region’s human health, infrastructure

and economic activities are affected by climate variability, climate change and other

sources of atmospheric stress (e.g., ground-level ozone, particulate matter).

A number of studies indicate a trend since 1970 towards heavier rain events and

more frequent intense events in the southern Ontario part of the Great Lakes basin.

This is consistent with observations of increased precipitable water in the lower

troposphere and general theory linking observed higher temperatures to greater

water vapour in the lower atmosphere. These phenomena, in southern Ontario and

many other parts of the world, are linked to climate change driven primarily by

increasing greenhouse gas concentrations especially since about 1970. Such trends

will continue for some decades to come.