Atlas of British Columbia: People, Environment, and Resource by A. L. Farley

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The stations are represented by short, transverse lines across the flow. For simplicity, the river discharge is assumed to vary uniformly between any two successive stations. From the spatial pattern of Streamflows as an expression of water availability, it is obvious that British Columbia is generously endowed with water in most regions. It should be remembered, though, that the map shows only the quantity of water discharged by streams, not water quality. Some aspects of the latter are expressed on the succeeding map page.

McPherson. " Zeitschriftfur Geomorphologie 21 (1977): 169-86. 31 Map 15. Vulcanism, Seismic Activity, and Major Groundwater Features Seismic activity, vulcanism, and, to some extent, thermal springs are related to large-scale earth processes associated with plate tectonics. Groundwater availability is more directly a function of climate, rock type and structure, and the nature and thickness of soil. It is conceptualized that the North American Cordillera arose from interaction of the northwesterly moving Pacific Plate with the North American Plate, believed to be moving more strongly toward the west.

Podsolic Soils are well-drained but infertile soils in which leaching is extreme. Clay, organic matter, iron, and aluminum are leached from the topsoil into the subsoil. They are associated with coarse-textured, acidic parent materials, high rainfall, and dense coniferous forest. Ferro-humic Podsols are characterized by an accumulation of organic matter in the subsoil; in Humo-ferric Podsols, iron and aluminum are the main accumulation products. Regosolic Soils are very poorly developed and occur either where the parent materials are recent (for example, alluviums in river floor plains) or where the environment is harsh and the process of chemical weathering is very slow (for example, high alpine areas).

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