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Design criteria for dams has evolved over time, often in response to dam failure events. While the industry, regulators, and dam owners have worked together to improve overall dam safety in Virginia, recent dam failures across the United States and other countries should prompt all to consider the lessons that can be learned and applied. For example, near-failure and failure events at structures such […]
The City of Winchester owns and operates the Percy D. Miller Water Treatment Plant in Warren County, Virginia which pulls source raw water from the North Fork of the Shenandoah River. The Plant, and the associated low head sill dam, raw water intake and pumping station, were constructed in the 1970s and are the sole […]
Virginia Soil and Water Conservation Districts received funding for the installation of remote monitoring equipment. This presentation will discuss the various challenges faced when selecting, installing, and using remote monitoring equipment on dams.
Virginia Soil and Water Conservation Districts received funding for the installation of remote monitoring equipment. This presentation will discuss the various challenges faced when selecting, installing, and using remote monitoring equipment on dams. The remote monitoring program has installed 18 units and looking to install an additional 60 units.
One of the first steps in a dam rehabilitation is calculating the amount of runoff that enters the reservoir during its specific design storm. The hydrologic analysis of a dam includes assessing upstream sources of flow such as those from a single drainage area or discharge from an upstream dam. More complex drainage areas can […]
In Virginia alone, there are 2,900 dams ranging from farm ponds to large reservoirs providing hydroelectric power and water supply. Approximately 360 of these dams are classified as potentially high hazard where failure would result in probable loss of life or serous economic damage. For dams where potential failure modes have been identified to have […]
A ‘High Hazard’ dam has the potential to cause loss of human life or damage to critical infrastructure if there were to be a failure of the structure. These structures require regular monitoring and specific observations during flood watch alerts and other high-risk events per the Virginia Dam Safety Act and outlined in the required […]
The FEMA HHPD grant funding bases eligibility on whether a dam is high hazard, has an EAP, fails to meet minimum state dam safety standards, and poses unacceptable risk to the public. In FY21 these criteria still apply while FEMA has begun to further define what “unacceptable risk” really means. Freese and Nichols, Inc. conducted […]
Fairfax County’s dam safety program recently identified a localized wet area on the downstream slope of Lake Barton, one of the County’s state regulated dams which was originally constructed in 1978. This presentation will cover the steps taken by the County to monitor, investigate, evaluate, and develop remediation plans to address the wet spot, replace […]
Willisburg Lake Dam is a high hazard structure which retains Willisburg Lake, the main water supply for the City of Springfield, KY and is used recreationally by the local communities. Known deficiencies at the dam include insufficient spillway capacity, seepage near the downstream toe, and an inoperable low-level outlet. The rehabilitation design had the objective […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
