Abstract
As the urban environment keeps growing, stormwater management programs have been adopted to address unregulated nonpoint runoff and pollutants across the world. Extensive studies on stormwater runoff and quality at smaller spatial scales exist, but are rare at larger spatial scales. Using the City of Corvallis, Oregon, a small sized American city, as a test-bed, this study estimates urban stormwater runoff and quality by zoning, which specifies land uses, and by parcel, which defines land ownership using the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) model and high resolution land use and land cover data. The correlations between stormwater runoff volume, stormwater quality, parcel land cover sizes, and values are then analyzed and visualized in RStudio. The results indicate that stormwater runoff and quality are determined by complex biophysical processes, with strong correlations between urban spatial sizes and property values for some land uses being observed. The research results provide suggestions for low impact development applications for different land uses, and the findings in this research can be used to suggest stormwater management policy for various land uses in small sized cities.
Highlights
Urbanized areas are often covered by man-made impervious hard surfaces such as building roofs, paved roads, sidewalks, and parking lots, as well as pervious surfaces such as natural vegetation, bare land, or water [1,2]
The limitation of Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) includes the requirement of the knowledge of geographical information system (GIS) and local data
The research analyzed the Pearson correlations among the economic variables, spatial variables (impervious pavement, pervious green cover), ecological variables (stormwater runoff volume, and stormwater quality) for parcel level commercial, industrial, and commercial land uses in RStudio
Summary
Urbanized areas are often covered by man-made impervious hard surfaces such as building roofs, paved roads, sidewalks, and parking lots, as well as pervious surfaces such as natural vegetation, bare land, or water [1,2]. In many large cities in the United States, storm pipes are integrated with sanitary sewers and connected to treatment plants where runoff is treated during precipitation events; stormwater is usually discharged directly into natural rivers and storms in small cities due to the lack of funds and facilities [13]. In light of these points, small cites need more diverse and comprehensive stormwater management strategies and policy to prevent nonpoint source pollution [14]. OR, was ranked as the third best small city to live in the U.S in 2018
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