Master environmental servicing plans: A tool for integrating stormwater management with environmental management

The adoption of watershed planning principles is playing an increasing role in land development. Preparation of a Master Environmental Servicing Plan (MESP) for subwatersheds or large areas provides a basis for the successful integration of existing natural systems with proposed urban land uses. MESP's arose out of the recognition that stormwater management plans were single purpose and did not always take into account the environmental sensitivity of the site. Knowledge of environmental constraints and opportunities on the site allows for the selection of an appropriate mix of stormwater Best Management Practices (BMP's) which can both preserve and enhance natural features. A MESP was done for a 1,000 acre parcel in Richmond Hill, Ontario. The site contained several significant features including a river and its tributaries, a creek, woodlots, and a valley system. Most of these were preserved within the development plan. Enhancement techniques included stream rehabilitation, plantings, creation of stormwater wetlands and use of BMP's to encourage infiltration. Thus, the MESP achieved its goal of integrated planning and design, met the requirements of the government agencies, and was acceptable to the general public and the client.