Consists of materials assembled by the Grand River Conservation Authority apparently in connection with a trial commencing in June, 1980 involving a lawsuit against the GRCA for property damage sustained by plaintiffs during the 1974 flood of the Grand River. Contains ts. (original and photocopy) correspondence to and from the Grand River Conservation Authority from their legal representatives, the firm of Lochead Sills Barristers, Kitchener, Ont.

Also includes ts.(original and photocopies) correspondence from 1948 to 1969 between the GRCA and federal and provincial authorities concerning flood control projects, and between the GRCA and legal firms, which appears to have been collated as evidence. Also includes ts.(photocopy) schedule of evidence presented by the GRCA at the hearings of the Ontario Royal Commission of Inquiry into the Grand River Flood, 1974; and ms.(original) report titled : Report on Grand River Flood Event, May 16-19, 1974, by the Grand River Conservation Authority.