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3

A Lot of Dam Data! Using ESRI’s Survey123 and Field Maps Applications to Efficiently Collect Data and Standardize Quarterly Inspection Packages for 30 Dams

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Routine quarterly inspections are integral to meeting Georgia Safe Dams Program (GSDP) requirements and maintaining the long-term health of the 30 dams owned and operated by the Gwinnett County Department of Water Resources’ (GCDWR). Since 2017, Hazen and GCDWR have worked together to regularly update and upgrade the inspection program to meet GCDWR’s evolving needs […]

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Risk Assessments for Dam Safety – Where, When, Why, How??? An introduction into Risk Informed Decision Making for Dams

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Risk Assessments and the use of Risk Informed Decision Making (RIDM) as it relates to evaluation of dam safety concerns have been used by many federal agencies for larger portfolios of dams for the past couple of decades. For many state, municipal, and private dam owners, however, the concept of RIDM and evaluating a dam […]

5

Benefits of Hazard Assessment using SQRA for Rural Dams

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Decades-old dams often become higher risk as they age, but owners might have limited resources for assessing the actual risks. A semi-quantitative risk assessment (SQRA) offers a solution. South River Dam #19 (SR-19), a flood control structure built in 1956 by the USDA-Soil Conservation Service near Waynesboro, Virginia, was designed as a low hazard structure […]

6

Remote Monitoring on Virginia Soil and Water Conservation District Dams – Part 3 (You Can’t Handle the Data!)

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Virginia Soil and Water Conservation Districts received funding for the installation of remote monitoring equipment.  The current monitoring network consists of 64 installed units, 33 units waiting for installation.  This presentation will discuss the various challenges faced when managing and using the data collected.

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Six of a Kind – Principal Spillway Conduit Sliplining of the Beautiful Run Watershed Dams

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The flood control dams of the Beautiful Run Watershed were constructed during the 1960’s by the National Resources Conservation Service (NRCS) in Madison County, Virginia.  The dams are sponsored by the Culpeper Soil and Water Conservation District (SWCD).  Six of the eight total Beautiful Run dams were originally constructed with bituminous coated corrugated metal pipe […]

8

Financing Dam Rehabilitation with Nutrient Credits

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Lake Overton Dam is a failing High Hazard dam that is privately owned and operated in Henrico, Virginia. Rehabilitating the dam is cost prohibitive for the owners but is a safety concern in the county. Henrico County Department of Public Works engaged AMT Engineering to design a dam rehab that also converted the lake to […]

9

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, […]

10

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 […]