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HYDROLOGY
Water resources are all waters of an area that are either
used, or can be used, for the economy. They are contained in rivers (there
are more than two million rivers in Russia), lakes (Lake Baikal is the
world's largest freshwate lake) and storage reservoirs, deep underground
aquifers that are not connected with the rivers, and in soil, bogs, swamps,
and mountain glaciers. The main type of water resource, however, is a
river runoff which is abundant practically everywhere and annually renewable.
Other kinds of water resources play an auxiliary role, although in some
regions they can have significant importance for the water supply of the
population and for some branches of the economy. More
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