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1

Zooplankton Community Structure is More Variable Over Short Timescales than Over Space, with Implications for Water Quality Management

Zooplankton are integral components of freshwater lake and reservoir food webs. Because of their role as a food source for fish and their ability to rapidly graze down algal populations, zooplankton play a critical role in maintaining water quality. To avoid fish predation during the day, zooplankton may migrate both vertically or horizontally (Diel Vertical […]

2

Whitehurst Dredged Material Management Area – A Successful Implementation of Management Planning for the Long-Term Disposal of Dredged Material in Virginia Beach, Virginia

The City of Virginia Beach converted a man-made borrow pit, formerly referred to as Whitehurst Lake, into a Dredged Material Management Area (DMMA).  The intent was to provide a long- term disposal site for dredging projects throughout the City of Virginia Beach.  The DMMA has been used for the disposal of dredged material from various […]

3

Proactive Data Collection for Flood Warning

As water managers and engineers, it’s important to understand our watersheds, urban landscapes, and their response to extreme events like heavy precipitation and rising surface water levels. Of the numerous tools at our disposal, there are many benefits to a flood warning system, including knowing in time where flooding issues could occur, enabling reactive action, […]

4

Improving Reservoir Monitoring of Organic Compounds Through High Frequency Sensors and Manual Sampling

The concentration of organic matter (i.e., naturally or anthropogenic-derived carbon-based compounds) is an important water quality metric for drinking water managers because of its numerous effects on water quality, necessitating new and improved strategies for monitoring our freshwaters. Here, we studied two types of organic compounds in a Virginia drinking water reservoir. First, pharmaceutical and […]

5

Lake Monroe Riser Failure

On January 5, 2022, a structural failure occurred at the bottom of the CMP riser structure for Lake Monroe in King George, VA.  The lake level began to drop and embankment material started to erode away into the riser.  This presentation will cover what ensued in the subsequent hours, days, weeks, and months, including emergency […]

6

Twin Lakes State Park Dam Rehabilitation

Twin Lakes State Park is a 548-acre recreational park located in Prince Edward County, Virginia that houses Goodwin Lake Dam and Prince Edward Dam. Both dams consist of earthen embankments with concrete overflow spillway and a riprap channel at the toe of the spillway chute. These dams are classified as low hazard. Stantec visited Goodwin […]

7

Dam Inspections and Emergency Evaluations: Tips and Tricks from a Dam Safety Engineer

The current Virginia Impounding Structure Regulations require that a professional engineer licensed to practice in Virginia perform safety inspections according to the following schedule: High Hazard Dams:  once every two years Significant Hazard Dams:  once every three years Low Hazard Dams:  once every six years All dams:  after an overtopping event or after flows cause […]

8

How Do We Deal with Tricky Dams? A Discussion of Strategies for Mitigating Dam Failures

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 […]

10

Protecting Critical Infrastructure: Addressing Dam Safety and Cybersecurity Risks

Dams are critical infrastructure that provide essential services such as water supply, hydropower, and flood control. However, aging infrastructure and the increasing connectivity of dam operations and control systems pose growing risks. This presentation will examine emerging challenges related to dam safety and cybersecurity. Specifically, it will cover: Key dam safety risks such as aging […]