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11

Soil and Water Conservation Districts – Dam Breach Inundation Study Updates (DBIZ: Past, Present, & Future)

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The Department of Conservation and Recreation – Division of Soil and Water Conservation in 2019 started to review and update existing Dam Breach Inundation Studies.  Key elements updated include 2015 Virginia Probable Maximum Precipitation Values, 2018 Virginia Probable Maximum Precipitation Temporal Distribution, 2021 USDA-Natural Resources Conservation Service Hydrologic Soils Ratings, Lidar topography, Hec-RAS 2D modeling, […]

12

Stormwater Modeling of the Sterns Creek Watershed and Master Drainage Planning of its City of Portion

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The Sterns Creek, a tributary to the Western Branch Elizabeth River in Virginia, and its watershed with a drainage area of 2,350 acres covers 1,360 acres in the City of Chesapeake and 990 acres in the City of Portsmouth. The watershed in both the cities with residential and commercial properties suffers from recurring nuisance or […]

13

Stumpy Lake Dam Spillway Capacity Improvement Alternatives

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The City of Virginia Beach identified the need to refine the existing HEC-HMS/RAS model for Stumpy Lake Dam to evaluate future dam and spillway improvements per the DCR conditional operations and maintenance certificate. Lying within a 10 square mile, highly urbanized drainage area, Stumpy Lake Dam is classified as a Significant Hazard Potential Dam. Significant […]

15

Really, Really, Ridiculously Good Looking Model Results: Looks Can Be Deceiving

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Advanced stormwater modeling has had a huge impact on our industry over the last decade. Modeling has allowed us to analyze complex systems at a city-wide scale that was previously unthinkable. These models allow us to quickly identify the problem and facilitate the implementation of potential solutions. But are these solutions practical or even constructible […]

16

Abingdon’s Flood Mitigation Plan for Town Creek

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Community Flood Mitigation at the local level can be very challenging due to the limited availability of public funds; however, for stormwater issues, the flooding problems our communities face are becoming more and more of a priority concern to local residents.  The Community Flood Prevention Fund and other state and federal funding opportunities in recent […]

17

Influence of Water-Quality and Habitat Gradients on Macroinvertebrate Community Composition in Salinized Mining-Influenced Headwaters

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Surface-coal mining in central Appalachia often results in salinization of headwater streams and alterations of habitat for aquatic biota. Responses in macroinvertebrate community composition across streams that vary in specific conductance (SC) and habitat have been documented. Headwater streams can also exhibit within-stream spatial variation in SC and habitat, frequently via dilution of mining-effluent, alterations […]

18

Deploying the Power of Machine Learning and Near Real Time Modeling for Stage Forecasting in Streams

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Forecasting stream flows and flood depths is an essential task in flood management and water resource planning.  Hydrologic/hydraulic simulation models or data-driven approaches can be used to generate these real-time predictions.  Modern advances in artificial intelligence and state-of-the-art machine learning (ML) techniques have provided new opportunities for quicker streamflow prediction processes with more efficient and […]

19

HEC-RAS Rain-on-Grid vs. Traditional Dam Hydrologic Modeling Approaches

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The US Army Corps of Engineers’ HEC-RAS has been around for nearly 30 years and modelers around the world have implemented its tools into their hydraulic analyses. Traditionally, drainage basin modelers would have to utilize separate software for their hydrologic calculations. However, for dam engineering analyses with HEC-RAS 2D Rain-On-Grid capabilities, the software now offers […]

20

A Really Complex Stormwater Model: Salters Creek 2D SWMM

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Engineers from the City of Hampton and GKY & Associates, Inc. recently completed a study of the 2,500-acre Salters Creek Watershed, which discharges to the Hampton Roads Harbor. The area has a relatively flat, low-lying topography with drainage infrastructure that is more than 70 years old. The City undertook this effort to reduce future flooding […]