Unit source area data: can it make a difference in calibrating the hydrologic response for watershed-scale modeling?
Pollution of streams, channels, and lakes by runoff from agricultural fields has been a major concern in the United States for a number of decades. Pollutants such as sediment and phosphorous that enter waterways adversely affect downstream water supplies, aquatic and wildlife habitat, and recreational opportunities. Conservation practices that are placed on croplands to protect fields from excessive runoff and soil losses provide one means of protecting the environment from the harmful effects of pollutants. Hydrologic simulation models that track the movement of runoff and pollutants from agricultural fields to downstream locations within a watershed represent valuable tools that can be used to evaluate the benefits of various conservation practices on reducing pollutant levels. Recent advances in computing capability and geographical information systems (GIS) have led to increasingly sophisticated watershed models that incorporate topography, soils, climate, land. use, and land mana
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