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This process results in higher peak discharges, even for short durations, from low intensity rainfall events ( Chen et al. For example, as the development of impervious surfaces increases and natural vegetation decreases, infiltration and evapotranspiration decrease.
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These anticipated changes can lead to an amplified hydrological response. Urbanization, which modifies the land surface by reducing vegetation, compacting soil and increasing the percentage of impervious surfaces, is also expected to increase these effects ( Chen et al. Climate change intensifies these effects because it increases the frequency of more intense storm events ( Kalantari et al. 1 Introductionįlooding is a global phenomenon that continues to threaten people, infrastructure and the environment in societies across the world. In addition, a sensitivity analysis of the two two-dimensional models was performed to compare the response of the models to the research assumptions. These two models were prepared with the United States Army Corps of Engineers Hydrological Engineering Center’s River Analysis System (USACE HEC–RAS) and PCSWMM. This study incorporates two different two-dimensional hydraulic modeling techniques to supplement previous one-dimensional hydraulic studies. Previous one-dimensional hydraulic studies conducted on the flood capacity of these channels show that they only have capacity to contain the 5 y storm event. A flood significantly affects the businesses and people of the area, trapping employees and customers inside businesses, forcing the shutdown of the Coaster service and access to the I-5 freeway, and causing hundreds of thousands of dollars in property damage. Roselle Street and Dunhill Street experience flooding multiple times a year due to overtopping of adjacent channels, including Carroll Canyon Creek, Los Peñasquitos Creek and Flintkote Channel. Sorrento West business park, a business campus for biotechnology and scientific research, is a flood prone hotspot in San Diego, California.