Historical Water Balance Quantification: Development of a New Methodology Using Selected Watersheds in Iowa as Test Beds

Historical Water Balance Quantification: Development of a New Methodology Using Selected Watersheds in Iowa as Test Beds

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The water balance model suggests that after the arrival of settlers, the evapotranspiration decreased when the vegetation was converted from prairie and forest to farmland and urban areas in the spring and summer, but increased in the winter and fall. The computed evapotranspiration for the four Iowa basins decreased 0.43% as a percentage of the total water in the water balance equation between the GLU survey and the Andreas survey. Streamflow decreased an average of 8.97%. Deep drainage assumed this additional water, making a 9.40% increase. In summary, the net effect of the vegetation change due to the first few decades of settlement in Iowa decreased annual evapotranspiration and shifted water in the water balance from streamflow (baseflow and direct runoff) to deep drainage.The procedure was created for the analysis of small watersheds, especially urban watersheds in the United States. The current TR-55 manual was updated from the 1975 version and published in 1986 (Soil Conservation Service (SCS), 1986)anbsp;...


Title:Historical Water Balance Quantification: Development of a New Methodology Using Selected Watersheds in Iowa as Test Beds
Author: Loren Lloyd Wehmeyer
Publisher:ProQuest - 2008
ISBN-13:

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