The authors have equipped a natural small experimental basin, with a catchment area of 4.4 ha, in the Tama Hills in the western suburbs of Tokyo, Japan. It has not only precipitation and streamflow gauging but also soil moisture measuring instruments and groundwater observation wells. At first, based upon the observed data, the partial hydrologic processes such as direct runoff, rainfall-loss, groundwater runoff, groundwater recharge, and evapotranspiration are analyzed. Then a daily hydrological model and an hourly hydrological model are constructed by synthesizing the results of the above analysis, and their applicability is examined. © 1983.
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