Toronto & Region Conservation

Sustainable Technologies Evaluation Program

Welcome to ISWM.CA is an online database of innovative and Low Impact Development stormwater management practices in Ontario, developed by the Toronto and Region Conservation Authority for the Ontario Ministry of the Environment. It is a free, publicly accessible archive for municipalities, developers, consultants and others to share information regarding these types of practices.

Register now to submit your projects and have them showcased to other professionals and organizations in the world of stormwater management. Your project will have its own project page where you can attach company logos, drawings and photographs, and generally get the word out there on the ground breaking work your organization is doing. The projects and practices featured on will be paving the way for the future of stormwater management in Ontario.

About Low Impact Development

During the past three decades, the practice of stormwater management has evolved. In the mid 1970s, attempts to control runoff flow rates from urban developments were initiated. By the late 1980s, water quality became an additional focus and in the late 1990s, approaches to mitigate accelerated stream channel erosion were introduced. Today, with improvements in our understanding of watershed systems and the potential impacts urbanization can have on aquatic ecosystems, stormwater management addresses a broad suite of issues including fluvial geomorphology (stream channel forming processes), groundwater resources and the protection of aquatic and terrestrial habitats.

As the practice of stormwater management continues to evolve, there is increasing interest in decentralized micro-controls at or near runoff source areas to supplement traditional detention facilities. Often referred to as Low Impact Development, these approaches attempt to mimic natural or pre-development hydrology through site planning and structural practices aimed at infiltrating, filtering, evaporating and detaining runoff, as well as preventing pollution. Such approaches have been implemented by many municipalities across the United States, Europe, Australia, New Zealand and Japan, and are advocated in other Canadian provinces such as British Columbia and Alberta. Low impact development practices can be applied in new developments, during re-development or as retrofits to older developments to reduce runoff volumes, pollutant loadings, and the overall impacts of developments on receiving waters.

Click Here for more information on these technologies, or visit for detailed descriptions, and technology evaluations.

Porous Pavement