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11

Building a Comprehensive GI Maintenance Program for Over a Thousand Assets from the Ground Up

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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 […]

12

20 Years of Dam Rehab, How We Made It Work in Virginia

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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 […]

13

A Case Study of Dam Overtopping Protection with an Engineered Turf Revetment in Loudoun County, VA

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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 […]

14

Web App for Analysis of Future Climate Extreme Precipitation

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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, […]

16

Living Shorelines and Fairfax County: Striving to Balance New Laws with Outdated Stabilization Practices

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In the past 10 years, the Virginia General Assembly has twice passed legislation incorporating “living shorelines” into the Code of Virginia as a method for stabilizing tidal shorelines in the Commonwealth. In 2020, Virginia Senate Bill 776 was passed by the General Assembly and signed by the Governor, which required the Virginia Marine Resources Commission […]

17

Ecological Resiliency & Transportation Infrastructure in an Urban Environment – Interstate 895 over Herring Run in eastern Baltimore City, Maryland

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In 2018, the Maryland Transportation Authority’s (MDTA) I-895 bridge crossing Herring Run suffered scour that endangered the southbound bridge’s piers and abutments.  In the late spring/early summer 2019, MDTA began corrective measures to mitigate this scour at the bridge.  This included two-plus years of responding to multiple large storm events, more frequent stream bed/bridge monitoring, […]

18

Oakdale Drainage Improvement Project: Overcoming Flood Mitigation Challenges in a Century Old Neighborhood

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The Oakdale drainage area is located in the South Norfolk Historic District in the City of Chesapeake. This stormwater basin is primarily comprised of residential properties that were developed in the first half of the 20th century. In recent years, this area has begun to experience a higher frequency of flooding events, likely due to […]

19

Integrating Beaver Dam Analogues (BDAs) in Stream Restoration Projects

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The science that supports constructed stream and floodplain environments to stimulate North American beaver colonization, and the effective implementation of that science, continues to evolve. KCI Technologies has been actively monitoring the scientific and engineering trends published by academic and public sector communities. This presentation will summarize KCI’s understanding of integrating beaver dam analogues (BDAs) […]

20

Leigh Meadow/Towlston Basin Stream Restoration and BMP Retrofits: A Tale of Constraints, Creativity, and Collaboration

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Under a Stream Stabilization/Restoration, Environmental, Permitting & Ancillary Services Basic Ordering Agreement, Stantec was awarded a Task Order by the Fairfax County Department of Public Works and Environmental Services (DPWES) to provide Stream Restoration and Stormwater Best Management Practice (BMP) Retrofit Design and Construction Administration services for the Leigh Meadow / Towlston Basin project in […]