Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 13 8 2009 10.5194/hess-13-1427-2009 http://www.hydrol-earth-syst-sci.net/13/1427/2009/ http://www.hydrol-earth-syst-sci.net/13/1427/2009/hess-13-1427-2009.html http://www.hydrol-earth-syst-sci.net/13/1427/2009/hess-13-1427-2009.pdf 1427 1438 2009-08-12 Future directions for hydropedology: quantifying impacts of global change on land use M. J. Vepraskas michael_vepraskas@ncsu.edu J. L. Heitman R. E. Austin Department of Soil Science, North Carolina State University, Box 7619, Raleigh, NC 27695-7619, USA Hydropedology is well positioned to address contemporary issues resulting from climate change. We propose a six-step process by which digital, field-scale maps will be produced to show where climate change impacts will be greatest for two land uses: a) home sites using septic systems, and b) wetlands. State and federal laws have defined critical water table levels that can be used to determine where septic systems will function well or fail, and where wetlands are likely to occur. Hydrologic models along with historic rainfall and temperature data can be used to compute long records of water table data. However, it is difficult to extrapolate such data across land regions, because too little work has been done to test different ways for doing this reliably. The modeled water table data can be used to define soil drainage classes for individual mapping units, and the drainage classes used to extrapolate the data regionally using existing digital soil survey maps. Estimates of changes in precipitation and temperature can also be input into the models to compute changes to water table levels and drainage classes. To do this effectively, more work needs to be done on developing daily climate files from the monthly climate change predictions. 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