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Loudoun County is regulated under the NPDES Phase II MS4 permit, which includes six (6) Minimum Control Measures (MCMs) to control stormwater pollution and manage water quality. The stormwater team at the Department of General Services provides oversight for these MCMs. One of the MCMs is the Illicit Discharge, Detection and Elimination (IDDE) program, which […]
This presentation takes the audience on a captivating voyage through time to experience the evolution of stormwater best management practices (BMPs) in Virginia. Beginning with the creation of Virginia’s first known water management practices, it details the events leading to the development and expansion of pivotal regulations and the Virginia Stormwater Management Program (VSMP). […]
The Virginia Department of Environmental Quality (DEQ) had outdated and uncoordinated materials to communicate design practices for stormwater management at land-disturbing sites. The Erosion & Sediment Control Handbook, Stormwater Management Handbook, and Chesapeake Bay Local Assistance Manual are each over or approaching thirty years of continued use. In addition, DEQ last updated its specifications for […]
Within a few years, there will be over a thousand District-owned stormwater green infrastructure (GI) assets within the Right-of-Way that all require maintenance. The District Department of Transportation’s bioretention, permeable pavement, and other stormwater best management practice (BMPs) are frequently subject to adverse urban conditions that lead to trash buildup, sedimentation, clogging, and other types […]
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 […]
Discuss methods for the use of land coverage changes to generate TMDL credits for compliance with the Chesapeake Bay TMDL Action Plan. Touch on the funding mechanisms that allow the conversion to be of little or no cost to the participant.
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 […]
This course provides insight into the importance of proper foundation flood vents and dry floodproofing techniques for buildings located in a flood zone. It will identify FEMA Technical Bulletins 1, 2, and 3, the National Flood Insurance Program, ASCE 24, ICC, and Building Code regulations and standards as they relate to sustaining foundations and overall […]
As we head into the second decade of meeting regulatory requirements related to the Chesapeake Bay TMDL, we have started to gain an understanding of the effects of time on our green infrastructure and stormwater management facilities. We’ve learned lessons about the importance of detail in design, construction methods, and maintenance that impact the longevity […]
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.
