Region 13, Western Glaciated Plains

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Abstract
The Western Glaciated Plains region (Fig. 3; Table 2, Heath, this volume) occupies an area of nearly two million km2 in southern Canada and the northern United States. About three quarters of this area lies in Canada, extending across portions of the four Canadian provinces of British Columbia, Alberta, Saskatchewan, and Manitoba. There it forms the region referred to by Brown (1967) as the Interior Plains hydrogeological region. It is thus the hydrogeological equivalent of that part of the western Canada sedimentary basin that lies south of the permafrost zone and is identical to the Southern Interior Platform area identified by Douglas and others (1970). In the U.S. the region extends across parts of Montana, North Dakota, South Dakota, Minnesota, Nebraska, Iowa, and Kansas. The climate throughout most of the region is subhumid continental except for that part that lies in Montana, southwestern Saskatchewan, and southeastern Alberta, where it is classified as arid to semiarid (Brown, 1967). Total precipitation varies from 250 to 750 mm annually in most parts of the region, exceeding this figure only along the western, eastern, and southeastern boundaries.

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