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The US Army Corps of Engineers’ HEC-RAS has been around for nearly 30 years and modelers around the world have implemented its tools into their hydraulic analyses. Traditionally, drainage basin modelers would have to utilize separate software for their hydrologic calculations. However, for dam engineering analyses with HEC-RAS 2D Rain-On-Grid capabilities, the software now offers […]
Virginia Department of Conservation and Recreation’s (DCR) Dam Safety and Floodplain Management Division was recently awarded a FEMA grant for Collaborative Technical Assistance (CTA). It will facilitate aiding communities at risk of dam-related flooding to better understand their risk landscape and the potential consequences of dam-related emergencies. The CTA will include planning for emergencies related […]
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 […]
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 […]
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 […]
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 […]
Clifton Forge Dam is a high‐hazard potential concrete gravity dam located in western Virginia that provides municipal water supply to the Town of Clifton Forge and its surrounding service area. The Town has a population of nearly 4,000 and sits directly in the path of a hypothetical floodwave should the dam fail. Due to inadequate […]
Virginia NRCS has rehabilitated 13 of its 150 watershed structures since the Rehabilitation Act of 2000. An additional three structures have completed Environmental Assessments. Rehab needs included state regulatory actions, such as requiring an increase in structure capacity brought on by a change in hazard classification, vegetated ASW integrity, material filter incompatibility, and riser stability […]
Many existing earthen dams in Virginia do not meet requirements of the Virginia Dam Safety Act. Reasons for failing to meet Dam Safety Act requirements include insufficient spillway capacity and inadequate embankment height for the required design event. Inadequate spillways and embankment heights increase the likelihood of dam overtopping. Dam overtopping can lead to partial […]
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 […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
