Abstract
The load of total nitrogen (TN) and total phosphorus (TP) in stream water was surveyed at 23 points in the Nagara River Basin (2000km2) located in the central part of Japan. Multivariate analysis was applied to relate the TN and TP data to the conditions of land coverage such as geologic feature, type of land use, population density, percent of sewered population, etc. The load of TN and TP was largely governed by the distribution of human activities such as industrial wastewater discharge, agricultural production, population density, domestic animal density.
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