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Flocculant treatment systems have become common practice across the US and globally. This is due to the versatility and effectiveness of anionic polyacrylamide (PAM) and PAM enhanced BMPs and technologies. PAM has been used in agriculture since the 1950s, mining and water treatment since the 1970s, and in the 1990s was introduced to the erosion […]
Washington, DC is uniquely situated at the confluence of two tidal rivers and is vulnerable to flooding from three different sources: riverine, tidal/coastal storm surge, and interior. As emphasized in the DC Department of Energy & Environment’s (DOEE) 2015 Climate Projections & Scenario Development report, all three types of flooding in the District are intensifying […]
The accessibility of authoritative and comprehensive geospatial data allows for tailored analyses over a wide range of subject areas and resolutions. One such application of GIS is a regional study of streams (and other measured waterbodies) to identify sections that would most or least benefit from restoration efforts. Criteria for the selection process can be […]
In recent years, the management of urban drainage systems has become increasingly complex, especially in areas with mature infrastructure and stringent spatial constraints. Traditional methods of surveying and mapping, while effective, often come with significant drawbacks such as prolonged traffic disruptions, safety risks, and limitations in data accuracy and detail. This presentation proposes a transformative […]
Whenever someone asks us what the stormwater management requirements will be on their upcoming project, our immediate response is “Where’s the project and what’s the total land disturbance?”. So, you might be thinking, “What exactly is so disturbing?”. Well, while the amount of land that’s disturbed during a project is a critical component to control […]
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 […]
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 […]
Due to climate change, the shape of future extreme precipitation likeliness is uncertain. Global climate models are not intended to capture local extremes, and different climate models provide different results. This is problematic for public works departments, transportation agencies, and other groups responsible for water resources infrastructure, because extreme event estimates drive engineering design. However, […]
There are many reasons why cities should consider retrofitting abandoned lots into small parks. Not only have they been shown to enhance the happiness and sense of community for residents, but these green spaces can also help improve the hydrological condition of urban areas by reducing impervious cover. WSP was tasked with the design of […]
In the most recent updates to the Expert Panel guidance for stream restoration TMDL Protocol calculations, site specific sediment sampling was introduced as a new requirement for Protocols 1 and 5. This presentation will discuss the new sampling guidance, identify areas where the guidance lacks detail, and provide examples of how the guidance is applied. […]
The Virginia Lakes and Watershed Association is a volunteer organization and its mission is to provide education on water resources in Virginia.
