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This presentation focuses on the stormwater engineering components involved in the implementation of a drainage project on a municipality’s Capital Improvements Plan (CIP) list. Existing site constraints provided the opportunity for storm sewer analysis through alternative modeling methods, while existing onsite utilities drove trunkline placement. As designers and planners, it is important to remember that there […]
This project, “Scope of Work 12: Data Review and Development of Multi-Metric Stream Health Indicators,” is a continuation of work developed by the Chesapeake Bay Program (CBP) Stream Health Work Group (SHWG) and the U.S. Geological Survey (USGS) to better understand the drivers and stressors affecting stream health throughout the Chesapeake Bay watershed. Currently, the […]
Neighborhood residential and structural flooding is one of the worst aspects of any significant rainfall event. In undersized drainage systems, even a small downpour can quickly flood streets, yards, and seep into the homes of unsuspecting citizens. Municipalities are often faced with the challenge of improving localized flooding in these areas with limited knowledge on […]
Coastal areas are prone to flooding, with natural and anthropogenic factors both contributing to the duration and severity of coastal flooding events. Natural factors include low-lying areas, little relief, high groundwater tables, heavy rains, and high tides. Anthropogenic factors include increased imperviousness, aging infrastructure, lack of maintenance, and stormwater infrastructure that does not meet current […]
The Virginia Impounding Structure Regulations (Regulations) require that low-level outlet systems in existing dams be kept operational. For dams built without low-level outlet systems, the Regulations stipulate that low-level outlet systems be retrofitted when practicable. In December 2020, the Department of Conservation and Recreation (DCR) and Virginia Soil and Water Conservation Board published a new […]
As stormwater management modeling advances and two-dimensional models become more commonplace, the need for bigger and better models is ever growing. Developing and using a large 1D-2D SWM model presents different challenges than just scaling up the methods and procedures involved in small-scale modeling. Using GKY’s recent 22,000-acre PCSWMM project for the City of Charlottesville […]
Due to the increasing cost of stormwater treatment, the City of Virginia Beach Department of Public Utilities (City) evaluated the requirements for developing a nutrient offset program. When a stormwater management facility (SWMF) can be incorporated into a site design, it typically comes at a significant cost. Creating regional SWMFs to offset the City’s facility […]
Lake Whitehurst is a drowned estuary impounded in the early 1900s to create a drinking water reservoir for the City of Norfolk. Since the initial impoundment, the dam spillway has been modified to include notches and removable stop logs to seasonally control the normal pool elevation of the lake. Today, Lake Whitehurst covers an area […]
As streams incise and erode, their vital interaction with the abandoned floodplain, or terrace, continues to decrease. This not only flushes excess sediment and pollutants downstream but separates the floodplain ecosystem from its source of life: the stream. Reconnecting the stream to a floodplain is critical for a successful restoration and has been incentivized through […]
Is the art of hydrology analysis taking a backseat to all the focus on 2D modeling advancements and the addition of Rain-On-Grid hydrology. It questions whether the allure of cutting-edge 2D modeling has diverted our focus from ensuring the accuracy of flow predictions. In this presentation, we will look at how the hydrology component might […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
