Reducing Threats From Contamination and Flood Damage: Restoring the Brandywine Creek Edge in Wilmington, Delaware, USA

Abstract

Located in Wilmington, Delaware, along the shoreline of the Brandywine Creek in the Greater Philadelphia/Delaware River Watershed, this project responds to a specific and critical need for the site as prioritized by multiple stakeholders. The project applies an innovative approach for quantifying increased flood resilience while simultaneously reducing contamination levels through the implementation of green infrastructure. To solve joint issues related to increased flood risk concurrent with higher potential for exposure to environmental contaminants transported in flood waters from adjacent industrial sites, brownfields, and combined sewer overflows, the research team develops a phased approach to decreasing stormwater runoff and pollutant loads on a 130-acre (52.6 hm²) site along the Brandywine Creek, applying the Long-Term Hydrologic Impact Assessment (L-THIA) model to quantify design impacts and performance of a master plan. Overall, the proposed master plan can reduce stormwater runoff and pollutant loads to levels significantly less than existing conditions or the current land use plan. Further, this research is unique in that it uses outputs from the L-THIA to compare existing conditions, effects of the current comprehensive plan, and impacts related to the proposed neighborhood-scaled master plan to evaluate the effectiveness between each scenario.

Keywords

Green Infrastructure / Landscape Performance / Flood Resilience / Contamination / Stormwater / L-THIA / Master Plan Assessment

References

[1] Sengul, H., Santella, N., Steinberg, L. J., & Cruz, A. M. (2012). Analysis of hazardous material releases due to natural hazards in the United States. Disasters, 36(4), 723-743.

[2] World Population Review. (n.d.). Wilmington, Delaware population 2022 (demographics, maps, graphs).

[3] Aly, N. A., Casillas, G., Luo, Y.-S., McDonald, T. J., Wade, T. L., Zhu, R., Newman, G., Lloyd, D., Wright, F. A., Chiu, W. A., & Rusyn, I. (2021). Environmental impacts of Hurricane Florence flooding in eastern North Carolina: Temporal analysis of contaminant distribution and potential human health risks. Journal of Exposure Science & Environmental Epidemiology, 31(5), 810-822.

[4] Whitman, Requardt & Associates. (2019). Northeast Wilmington Community revitalization implementation plan.

[5] Doyle, M. W., & Shields, D. F. (2012). Compensatory mitigation for streams under the clean water act: Reassessing science and redirecting policy. Journal of the American Water Resources Association, 48(3), 494-509.

[6] U.S. Census Bureau. (2010). Quick facts: Wilmington City, Delaware.

[7] State of Delaware. (n.d.). My Healthy Community: Delaware Environmental Public Health Tracking Network.

[8] McMillan, H. (2011). Planning for sea level rise in the Northeast: Considerations for the implementation of tidal wetland habitat restoration projects (workshop report).

[9] Partnership for the Delaware Estuary. (2017). Freshwater mussels.

[10] Environmental Protection Agency. (2017). Brownfields 2017 area-wide planning grant fact sheet.

[11] Perez, V. W., & Egan, J. (2016, September). Knowledge and concern for sea-level rise in an urban environmental justice community. Sociological Forum, (31), 885-907.

[12] Fairbairn, D. J., Karpuzcu, M. E., Arnold, W. A., Barber, B. L., Kaufenberg, E. F., Koskinen, W. C., Novak, P. J., Rice, P. J., & Swackhamer, D. L. (2016). Sources and transport of contaminants of emerging concern: A two-year study of occurrence and spatiotemporal variation in a mixed land use watershed. Science of the Total Environment, (551-552), 605-613.

[13] Zhu, R., & Newman, G. (2021). The projected impacts of smart decline on urban runoff contamination levels. Computational Urban Science, 1(2), 1-20.

[14] Newman, G., Shi, T., Yao, Z., Li, D., Sansom, G., Kirsch, K., Casillas, G., & Horney, J. (2020). Citizen science-informed community master planning: Land use and built environment changes to increase flood resilience and decrease contaminant exposure. International Journal of Environmental Research and Public Health, 17(2), 486.

[15] Hendricks, M. D., Newman, G., Yu, S., & Horney, J. (2018). Leveling the landscape: Landscape performance as a green infrastructure evaluation tool for service-learning products. Landscape Journal, 37(2), 19-39.

[16] D’Asaro, F., Grillone, G., & Hawkins, R. H. (2014). Curve number: Empirical evaluation and comparison with curve number handbook tables in Sicily. Journal of Hydrologic Engineering, 19(12), 04014035.

[17] Wang, Y., Choi, W., & Deal, B. M. (2005). Long-term impacts of land-use change on non-point source pollutant loads for the St. Louis Metropolitan Area, USA. Environmental Management, 35(2), 194–205.

[18] Mirzaei, M., Solgi, E., & Salmanmahiny, A. (2016). Assessment of impacts of land use changes on surface water using L-THIA model (case study: Zayandehrud river basin). Environmental Monitoring and Assessment, 188(12), 690.

[19] Zhang, J., Shen, T., Liu, M., Wan, Y., Liu, J., & Li, J. (2011). Research on non-point source pollution spatial distribution of Qingdao based on L-THIA model. Mathematical and Computer Modelling, 54(3-4), 1151-1159.

[20] Engel, B. A., Ahiablame, L. M., & Leroy, J. D. (2015). Modeling the impacts of urbanization on lake water level using L-THIA. Urban Climate, (14), 578–585.

[21] Zare, M., Samani, A. A. N., & Mohammady, M. (2016). The impact of land use change on runoff generation in an urbanizing watershed in the north of Iran. Environmental Earth Sciences, 75(18), 1279.

[22] Department of Planning and Development, City of Wilmington Delaware. (2019). Wilmington 2028: A comprehensive plan for our city and communities.

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Higher Education Press