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  • A/E/C Computer-Aided Design (CAD) Standard: Release 6.2

    Abstract: The A/E/C Computer-Aided Design (CAD) Standard has been developed by the CAD/Building Information Modeling (BIM) Technology Center for Facilities, Infrastructure, and Environment to eliminate redundant CAD standardization efforts within DoD and the Federal Government. This manual is part of an initiative to develop a nonproprietary CAD standard that incorporates existing industry, national, and international standards and to develop data standards that address the entire life cycle of facilities within DoD. The material addressed in the A/E/C CAD Standard includes level/layer assignments, digital file naming, and standard symbology. The CAD/BIM Center’s primary goal is to develop a CAD standard that is generic enough to operate under various CAD software packages (such as Bentley’s MicroStation and Autodesk’s AutoCAD) while incorporating existing industry standards when possible. While this Standard encompasses many CAD concepts and practices, it is not intended to limit the capabilities of other advanced modeling software. Ultimately, a BIM / Civil Information Modeling standard will be developed to standardize the additional capabilities of other software.

  • Signal Power Distributions for Simulated Outdoor Sound Propagation in Varying Refractive Conditions

    Abstract: Probability distributions of acoustic signals propagating through the near-ground atmosphere are simulated by the parabolic equation method. The simulations involve propagation at four angles relative to the mean wind, with frequencies of 100, 200, 400, and 800 Hz. The environmental representation includes realistic atmospheric refractive profiles, turbulence, and ground interactions; cases are considered with and without parametric uncertainties in the wind velocity and surface heat flux. The simulated signals are found to span a broad range of scintillation indices, from near zero to exceeding ten. In the absence of uncertainties, the signal power (or intensity) is fit well by a two-parameter gamma distribution, regardless of the frequency and refractive conditions. When the uncertainties are included, three-parameter distributions, namely, the compound gamma or generalized gamma, are needed for a good fit to the simulation data. The compound gamma distribution appears preferable because its parameters have a straight forward interpretation related to the saturation and modulation of the signal by uncertainties.

  • USACE and MDNR to meet with public to provide update on Holt/Doniphan County Flood Risk Management Study

    The U.S. Army Corps of Engineers and the Missouri Department of Natural Resources are hosting a public meeting to update the citizens of Holt County, Missouri, and Doniphan County, Kansas, about progress on the flood risk management study since April. The meeting is scheduled from 5 p.m. to 7 p.m. on Thursday, Aug. 8. It will be held at the Loess Hills Lodge, 406 State Street, Mound City, Missouri.

  • 757th Airlift Squadron to conduct aerial moquito spray over Craney Island July 23

    The 757th Airlift Squadron assigned to Youngstown Air Reserve Station, Ohio, will conduct an aerial mosquito spray over Craney Island and the Churchland section of Portsmouth overnight Tuesday, 23 July 2023. In the event of weather or mechanical delays, the mission will take place on July 24 or 25.

  • U.S. Army Corps of Engineers in the Pacific Theater: Overcoming Unprecedented Challenges

    In the most primitive, undeveloped, and remote areas of the Pacific Ocean, China, and Southeast Asia, the U.S. Army Corps of Engineers played a crucial role during World War II. These regions, often covered with impenetrable jungles, teeming with tropical insects and diseases, cut by swift and wide rivers, and crossed by rugged mountains, presented formidable challenges. The engineers faced the task of creating logistical facilities at the end of tenuous supply lines stretching hundreds, if not thousands, of miles back to developed bases.

  • USACE seeks public comment on BNSF Railway Bridge Removal Project

    A proposed removal of the BNSF Railway Company (BNSF) Bridge 2001-518, located on the Big Sioux River within Sioux City, Iowa and North Sioux City, South Dakota, is currently available for public review and comment. The purpose of the project is to remove BNSF Bridge 2001-518.9 due to a significant storm event that caused the structure, managed by the USACE Omaha District, to be damaged and dislodged from the pier in the center of the river.

  • ‘Someplace they can feel at home and happy’: Kansas City District completes design for new Fort Leavenworth child development center

    One of the biggest challenges our nation’s servicemembers and their families face is moving from installation to installation across the country, sometimes across the world, every couple of years. To help reduce the stress and uncertainty that servicemembers and their families can experience during a permanent change of station, the Army uses standard designs when constructing facilities on their installations. This helps to instill a sense of familiarity across installations.

  • Critical Repairs on the Way for Dunkirk Breakwater

    The U.S. Army Corps of Engineers, Buffalo District awarded a $7.56 million contract to Michigan-based Great Lakes Dock & Materials, LLC on June 25, 2024 for repairs to Dunkirk Harbor’s breakwater. Repairs to the breakwater maintain Dunkirk Harbor’s viability and contributions to the local economy, protect some of the area’s best waterfront recreation, and ensure a harbor of refuge for vessels on the Great Lakes.

  • U.S. Army Corps of Engineers to treat invasive flowering rush in Lake Pend Oreille

    U.S. Army Corps of Engineers’ (USACE) officials from Albeni Falls Dam will be performing aquatic herbicide treatments at five (5) separate USACE owned locations on Lake Pend Oreille, totaling a minimum of 28 acres and a maximum of 60 acres, to manage the invasive weed, flowering rush.

  • Jacksonville District making repairs to City of Venice south jetty through Friday

    U.S. Army Corps of Engineers, Jacksonville District, has begun executing several days of minor repairs along the southern jetty system at Venice Inlet; repair work is expected to complete by Friday, July 25, 2024.