Consists of ts. report prepared by H.G. Acres & Company, Limited, Niagara Falls, Ont. for the Grand River Conservation Commission regarding design and testing of a model sluiceway for the Conestogo Dam, near Glen Allan, Ont. undertaken in 1953. Includes blueline drawings of the general arrangement of spillway, dam model, and stilling basin, prepared by H.G. Acres and Company in November, 1953, and photographs of the sluiceway model. Correspondence between the Grand River Conservation Commission and the Ontario Department of Planning and Development is inserted.

Consists of materials relating to the early history of the Grand River Conservation Commission and the development of the Grand River Conservation Authority.

Includes newspaper clippings, including two articles by Hugh Templin (1966), ms. notes by an unidentified author concerning the development of the GRCC from 1931 to 1946, four negatives in an envelope labelled "Drayton: Conestogo river, May 22, 1952," an advance proof of a cover page of a publication titled : Flood Control in Southwestern Ontario, and a pamphlet by the Grand Valley Group of Engineers titled : A Plan to Grow Wealth and Eliminate Waste, 1936.

Consists of a ts.brief prepared by the Grand River Conservation Commission to demonstrate to federal and provincial authorities the need for proposed multi-purpose reservoirs and other control work the Grand River Watershed.

Includes four blackline maps of proposed reservoir catchment areas in Ayr and West Montrose, Ont. and flood stage maps of the cities of Brantford, Paris and Galt, Ont., prepared by J.M. Tomlinson & Associates Ltd, Consulting Engineers, January, 1964. Also present are photographs of floodwaters in the Grand River Watershed at Brantford, Galt and Paris, March 20-22,1948.