Planning & Management

Oral

397285 - Assessment of Mansionization and Residential Infill Development on Stormwater Runoff

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Greenway AB
Co-Authors: Meghan Hekl, Blacksburg, VA – Virginia Tech; Clayton Hodges, Blacksburg, VA – Virginia Tech

Residential infill and redevelopment is contributing to significant increases in impervious cover in suburban areas, resulting in increased stormwater runoff. This has the potential to overwhelm aging infrastructure causing erosion, flooding, and ecological degradation of waterways. The lack of greenfield sites available for new development around urban centers coupled with a desire for maintaining a traditional neighborhood aesthetic drives residential infill and replacement of existing smaller homes by significantly larger structures, minimizing open space available for stormwater mitigation. An analysis of residential infill development trends in a watershed within Fairfax County was performed to characterize the effects of intensified development. Development patterns were identified and assessed using digitized impervious cover data extracted from aerial imagery of the study area for six selected years from 2002 to 2015. The average annual increase in impervious area was evaluated against metrics such as lot size and demographic blocks to determine historical trends and predict future rates of infill development. A hydrologic analysis was conducted to quantify the increase in stormwater runoff attributable to the change in impervious cover due to residential development throughout the study area. The results of this study provide a quantitative basis for municipalities to amend policies regulating residential development and its associated stormwater management.

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397285 - Assessment of Mansionization and Residential Infill Development on Stormwater Runoff



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