Providing access to additional items for download that don't have a home elsewhere. Groundwater models with related documentation, as well as ready-made maps and various reference materials, are available in this section.
The Grand River Simulation Model (GRSM) is a computer model of the watershed. Water quality and planning staff use it to understand how changes in wastewater treatment plants might affect water quality. A model is necessary because changes in water quality are caused by a complex interaction of many factors that change over time
The model was developed in 1980 and has been updated many times. In 2008 an independent review compared GRSM to five other computer models of the river and found that GRSM was the most applicable. Dr. Isobel Heathcote, professor of Environmental Science and Environmental Engineering at the University of Guelph did the review.
The Floodplain Mapping Tech Transfer information was created through a collaboration project between the Province of Ontario (MNRF), and Conservation Authorities (Grand River and Ganaraska). Through a series of sub-projects the goal was to evaluate modern, cost effective, risk based options for many components of floodplain mapping, using a provincial perspective.
This information is also provided at the annual Floodplain Mapping Technical Transfer Workshop on the workshop USB drives.
GRCA has a collection of paper maps and aerial photographs, dating back to the mid-1900s, that are accessible to the public. Please contact the Engineering Technical Assistant, at (519) 621-2763, Ext. 2324 to order any additional hard-copy map products not listed here. Fees may apply and vary by item.
If you are interested in viewing historical aerial photographs and orthoimages you can also call the Engineering Technical Assistant to setup an appointment.
The GRCA works with a number of community partners and consulting firms. Geospatial data is part of many of these projects. The quality, reliability and usability of geospatial data outcomes from such projects is directly impacted by decisions around horizontal and vertical reference systems and other parameters.
A reference document was created to support GRCA staff and is also provided here for access by agencies working with and providing data to GRCA.