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The design storm is a fundamental parameter for risk and vulnerability assessment of urban infrastructure. It is traditionally determined from historic observations. There is however growing recognition that design storm calculations based on historical data may misrepresent flood risk due to future climate change. To determine if and when the design storm calculation should consider […]
Washington, DC is uniquely situated at the confluence of two tidal rivers and is vulnerable to flooding from three different sources: riverine, tidal/coastal storm surge, and interior. As emphasized in the DC Department of Energy & Environment’s (DOEE) 2015 Climate Projections & Scenario Development report, all three types of flooding in the District are intensifying […]
Over the last five years, the City of Virginia Beach has completed the development of the hydrologic and hydraulic models for all 15 drainage basins throughout the City’s nearly 500 square miles. Each of the 15 drainage basins model has been calibrated and validated against data observed during historical storm events that caused flooding in […]
Computational Fluid Dynamics (CFD) modeling has been a tool utilized for complex hydraulic problems for many years. It is often glossed over as a process that is expensive, both from a time and monetary perspective. Generally, with the thought that it won’t add much benefit besides providing a pretty colorful picture. This might have been […]
In recent years, flooding along Otterdale Road has occurred during periods of heavy rainfall leaving neighborhoods completely landlocked. This Design Build project consists of three different locations associated with the stream crossings of Blackman Creek, Horsepen Creek, and Otterdale Branch with Otterdale Road where bridge replacements are being proposed. The purpose of this project is […]
Base Level Engineering (BLE) flood models for 13 watersheds covering more than 11K square miles of the panhandle was developed for the Northwest Florida Water Management District (NWFWMD). These BLE processes followed large-scale, automated engineering methodologies to produce flood hazard information. The purpose of NWFMWD’s BLE project is to develop updated flood studies using high […]
The Clean Air Act Amendment in 1990 has been successful in limiting sulfate atmospheric deposition, but sulfate stream concentrations remain high, particularly in unglaciated regions. There are several anthropogenic sources of stream sulfate, including building materials, road salt, septic systems, and agriculture. Beyond acidification, sulfate fluxes have ecological consequences for nutrient cycling through mobilizing phosphate. […]
The site design for a new 2-million-gallon finished water ground storage tank and booster pump station in a fully developed area of the City posed a stormwater runoff management challenge. The storage tank and booster pump station are located on a former bank site that featured no existing stormwater infrastructure and simply sheet flowed runoff […]
Some of the most important ways in which we as engineers can manage and protect downstream areas from a potential dam failure event are performing routine maintenance, providing sufficient spillway conveyance, and implementing proper emergency planning. Dam Safety regulations are constantly evolving and changing over time, so many existing spillways and embankments we work with […]
According to the Virginia Department of Conservation and Recreation regulations, high-hazard dams are required to pass 90% of the Probable Maximum Flood (PMF) or “most severe flood considered possible in a specific region.” The PMF results from the most severe combination of meteorologic and hydrologic conditions possible within a given drainage basin. Since the 1980s, […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
