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1

National Flood Insurance Program-Some Possibilities for the Future

Just before the end of 2022, the NFIP received its’ 25th short term reauthorization (hip hip hooray!) and our next reauthorization deadline is September 30th, 2023.  The NFIP continues its’ transformation in many areas, including transition from a class/zone-based system to individual structure risk assessment and premium determination.  We will overview the status of Risk […]

2

Successfully Communicating Stormwater Management with the Public

The City of Virginia Beach has worked hard to develop partnerships with our residents regarding storm drainage issues.  This presentation will cover some of the successful strategies for communicating with the public after flooding events and during design of projects.  These strategies include:  reviewing the history of drainage for the neighborhood; capturing public concerns, input […]

3

Atlantic Reefmaker™, Oyster Catcher™, Shell Bags and Bulkheads – A Shoreline Protection Technology Comparison in Emerald Isle, North Carolina

The shorelines of sound-side properties in Emerald Isle, North Carolina have suffered tremendous erosional losses from hurricanes, severe winter storms and, over the past decade, rapidly rising sea levels. In 2005, Hurricane Ophelia devastated the shoreline at 206 Washington Street, prompting the owners to install a bulkhead above the mean high-water line to protect their […]

4

Designing for Climate Change – Flood Risk Mitigation Using Optimization (Alexandria VA)

The City of Alexandria, VA, has experienced repeated and increasingly frequent flooding. The increased storm related flooding is attributable to old infrastructure, inconsistent design criteria, and climate change. The objectives of the study were to (1) update stormwater collection system modeling and improve understanding of flood extents, (2) use optimization to evaluate alternatives and maximize […]

5

1D-2D SWMM Calibration Case Study: Stoney Run Drainage Study

August 15th, 2020 was a memorable day for residents of the Colony Pines and Windsor Great Park Neighborhoods as stormwater overtook streets, yards, and residential structures, compounded by overtopping of storage basins and their accompanying floodwalls. These communities are located in the Stoney Run watershed, characterized as an urban residential region after being developed largely […]

6

Lessons Learned from Integrating 1D and 2D Riverine and Collection System Models

Many communities in Virginia and across the country suffer from routine and often severe flooding due to a combination of riverine impacts and old, undersized stormwater collection systems. But how many communities have the opportunity to developed detailed hydrologic and hydraulic models of both systems on a watershed scale? The City of Fayetteville NC had […]

7

Cedar Island Marsh Creation: Leveraging the Co-Benefits of Coastal Restoration

As our region continues to adapt to the effects of sea level rise, nature-based features can be an important part of the solution. Although long hailed as beneficial to coastal resilience, the actual advantages of such approaches are often inflated. For example, the use of marsh restoration as a buffer to storm surge, or as […]

8

Seeing is Believing: The Value of Viewing Stormwater Parks as Community Assets

Stormwater parks, which are public facilities that enhance communities by providing stormwater treatment and recreational opportunities in the same location, should be viewed as community infrastructure assets. These integrated systems not only treat polluted runoff from increased urbanization, but also provide improved overall aesthetics, recreational and educational opportunities, and livability where they are constructed. As […]

9

Risk Assessments for Dam Safety – Where, When, Why, How??? An introduction into Risk Informed Decision Making for Dams

Risk Assessments and the use of Risk Informed Decision Making (RIDM) as it relates to evaluation of dam safety concerns have been used by many federal agencies for larger portfolios of dams for the past couple of decades. For many state, municipal, and private dam owners, however, the concept of RIDM and evaluating a dam […]

10

Benefits of Hazard Assessment using SQRA for Rural Dams

Decades-old dams often become higher risk as they age, but owners might have limited resources for assessing the actual risks. A semi-quantitative risk assessment (SQRA) offers a solution. South River Dam #19 (SR-19), a flood control structure built in 1956 by the USDA-Soil Conservation Service near Waynesboro, Virginia, was designed as a low hazard structure […]