Abstract
Abstract A small urbanized experimental basin with a catchment area of 2.8 ha, in the Tama hills in the western suburbs of Tokyo, Japan, called the Nagayama Basin, has been studied. The site has rain-recording and streamflow gaugings as well as soil-moisture measuring instruments and groundwater observation wells. Initially, based upon the observed data, the partial hydrologic processes, such as direct runoff, rainfall-loss, groundwater runoff, groundwater recharge, and evapotranspiration, are respectively analyzed. Subsequently, daily and hourly hydrological watershed models are constructed by synthesizing the results, and their applicability is examined. Finally, these models are compared with the models obtained for a natural experimental basin with a catchment area of 4.4 ha, located on the same Tama hills, and the effects of urbanization on hydrologic processes are commented on.
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