Estimating and Projecting

Research Laboratory in Athens, Georgia. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. ii Acknow ledgments We wish to thank Lourdes Prieto for her immense help in lending GIS technical assistance, including helping determine impervious cover during the test data set development. We also thank Stephen Alberty for his development of the GIS Cover Tool and helping determine impervious cover during the test data set development. Foreword Complete identification and eventual prevention of urban water quality problems pose significant monitoring, “smart growth ” and water quality management challenges. Uncontrolled increase of impervious surface areas (roads, buildings and parking lots) causes detrimental hydrologic changes, stream channel erosion, habitat degradation and severe impairment of aquatic communities. In conjunction with the U.S. Environmental Protection Agency, Region 4 Atlanta, we provide a multiple data source estimation of imperviousness in the southeastern U.S