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Series consists of floodplain maps that of the Thompson and South Thompson Rivers between Kamloops and Chase. The Water Investigations Branch created these maps between 1973 and 1975 to document areas that were susceptible to flooding.

The maps were bound in a volume and were numbered sequentially. There is an index at the front of the volume. Each map is also stamped with the Surveys and Mapping Branch of the BC Lands Service since the floodplain information was overlaid on maps that were originally maps were originally created in 1970 and 1973. All maps are 65 x 92 cm.

There are two groupings of maps. The first 33 maps show the Kamloops area from 1973-1974. These have a 1:2500 scale. These maps are stamped with the project number 73-81-0 and the file number 161673.

The second grouping consists of 27 maps of the South Thompson River from Kamloops to Chase. These have a 1:5000 scale. The project number of these maps is 74-109t-0.