Larger Image

PCTIA_RD - Percent total impervious area based on road density

The percent total impervious area is calculated using road density as the independent variable in a linear regression model (May et al. 1997).

May, C.W., Horner, R.R., Karr, J.R., Mar B.W., Welch, E.B. 1997. Effects of urbanization on small streams in the Puget Sound Lowland Ecoregion. Watershed Protection Techniques. 2:4. pp. 483-493.sss