AbstractParcel Level Imperviousness by Development Types across Urban GradientTrack: Environmental Management Author Imperviousness has been widely accepted as an important indicator with which to measure the impact of land development on aquatic systems. The purpose of this study is to compare the imperviousness among various development types, examine whether the imperviousness of various development types vary across the urban to rural gradient and across the Urban Growth Boundary. This study overlays impervious data, parcel data and urban-suburban-exurban-rural gradient data for 6 development types including Single Family Residential (SFR), Multi-Family Residential (MFR), commercial, institutional and parking. The results show that: (1) the imperviousness decreases along urban to rural gradient for all 6 development types; (2) SFR parcels have the lowest imperviousness in all gradient zones, with MFR and institutional parcels coming in second. (3) UGB has significant effect in increasing imperviousness for SFR parcels, with the change inside the Urban Growth Boundary (UGB) greater than the changer outside UGB. Yan Jiang University of Washington 3906 171st PL NE Bellevue, Washington 98008 United States Phone: 4254982335 E-mail: jiangyan1999@hotmail.com |