In a research program carried out by I.N.R.S.-Eau, certain principles inherent to the rational development of hydrometric networks were applied to the Quebec network. This study describes an application of a method specific to the development of a basic network. The method used to establish the number of stations required is based on the actual knowledge of the spatial distribution and time variability of the mean annual runoff. A modified version of Karazev's (1968) method applied originally to a study of the hydrographic basins in the USSR was found to be particularly suitable to regions of little hydrologic information and particularly to Quebec.

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