Abstract
Hydrologic effects of rainfall augmentation were studied using mathematical models for the digital computer to simulate rainfall augmentation and the hydrologic response of a watershed. A statistical model was developed to simulate percent increases in hourly precipitation, then the Stanford Watershed Model was used to calculate the streamflow, soil moisture and evapotranspiration. Calculations for three study watersheds were made using measured precipitation. Precipitation increased by 10%. Generalizations were developed relating the expected increases in streamflow and evapotranspiration to the natural precipitation and streamflow. Soil moisture increases averaged from 0.1 in. for dry watersheds to 0.5 in. for watersheds in wetter climates. Increases in the mean of the annual series of peak flows ranged from 8.5% to 76% and depend on the volumes of natural precipitation, surface runoff and interflow.
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