Abstract
The relationship between the stream water quality and mean basin slope was examined in the mountainous region of the Azusa River and Tama River basin. The ionic compositions of stream water are of Ca-HCO3 type and of Ca · Na-HCO3 type. The HCO3-, Ca2+ and Na+ concentrations in stream water exhibit a negative correlation with the mean slope angle in the mountainous watersheds of the Tama River. In contrast, the HCO3- and Ca2+ concentrations in stream water are correlated to the mean slope angle in the mountainous watersheds of the Azusa River, and the Na+ concentrations are not correlated with the mean slope angle. The Na+/Ca2+ ratio in stream water has a negative correlation with the mean slope in the mountainous watersheds of both the Azusa River and Tama River. It is proposed that the depth of groundwater flow coupled with the basin slope is one of the factors influencing the stream water quality.
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