Technical Results
Impervious Surface Changes

As imperviousness increased in each watershed (Figure 1), very different responses were found between the two subdivisions (Figure 2). No change in runoff was seen for the LID subdivision, but a logarithmic increase in stormflow was found from the Traditional subdivision (Figure 2), even though precipitation showed no trend.

More information on this study can be found in the following reference:
Dietz, M.E., and Clausen, J.C. Stormwater runoff and pollutant export changes with development in a traditional and low impact subdivision. Journal of Environmental Management, in press.

Figure 1. Changes in impervious cover with time in the Traditional and LID subdivisions. Figure 2. Changes in runoff depth with changes in total impervious area, Traditional and LID subdivisions.


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