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  • Protecting the workforce through Fall Protection training

    USAG HUMPHREYS, Republic of Korea -- Fall protection safety equipment and training have evolved over the years, reinforcing continuous safety on construction sites. According to the Center of Disease Control’s National Institute for Occupational Safety and Health, falls remained the leading cause of work-related construction deaths, accounting for more than one in three (36.4%) of the total number of fatalities in the industry in 2019.

  • 22-003 Dworshak Dam discharges to increase to draft reservoir to meet flood risk management targets

    AHSAHKA, Idaho – In order to meet flood control targets for January, reservoir managers will increase releases Monday evening, January 10, from 1,700 cubic feet per second (cfs) to approximately 2,400 cfs.

  • MKARNS Nav Notice SWL 22-03 Lock 8 Tow Haulage Returned to Service

    MKARNS - Tow haulage equipment at Toad Suck Ferry Lock (No. 8) NM 155.9 has been returned to service.

  • Dry Conditions expected to persist for the Missouri River Basin

    The 2021 calendar year runoff summation for the Missouri River basin above Sioux City, Iowa was 15.2 million acre-feet, 59% of average. The ongoing drought shows no relief in sight and the U.S. Army Corps of Engineers is predicting runoff into the mainstem reservoir system will remain below normal. This was the 10th lowest annual runoff for the Missouri River Basin in 123 years of record-keeping.

  • Pittsburgh District to host snowperson contest at Tionesta Lake

    The U.S. Army Corps of Engineers Pittsburgh District will host a snowperson contest at Tionesta Lake beginning Jan. 15.

  • ISPM honors Thompson with 2021 Difference Maker Award

    Daphne Thompson, who has worked at Huntsville Center since January 2009, received the Installation Support and Program Management Directorate’s 2021 Difference Maker Award during an awards presentation in December.

  • Implementation of an Albedo-Based Drag Partition into the WRF-Chem v4.1 AFWA Dust Emission Module

    ABSTRACT: Employing numerical prediction models can be a powerful tool for fore-casting air quality and visibility hazards related to dust events. However, these numerical models are sensitive to surface conditions. Roughness features (e.g., rocks, vegetation, furrows, etc.) that shelter or attenuate wind flow over the soil surface affect the magnitude and spatial distribution of dust emission. To aide in simulating the emission phase of dust transport, we used a previously published albedo-based drag partition parameterization to better represent the component of wind friction speed affecting the immediate soil surface. This report serves as a guide for integrating this parameterization into the Weather Research and Forecasting with Chemistry (WRF-Chem) model. We include the procedure for preprocessing the required input data, as well as the code modifications for the Air Force Weather Agency (AFWA) dust emission module. In addition, we provide an example demonstration of output data from a simulation of a dust event that occurred in the Southwestern United States, which incorporates use of the drag partition.

  • Vertical and Horizontal Datums Used in the Lower Mississippi Valley for US Army Corps of Engineers Projects

    Abstract: Six geodetic datums have been used by the US Army Corps of Engineers (USACE), Mississippi River Commission (MRC), for river surveys in the Lower Mississippi Valley (LMV). These legacy elevation datums are the Cairo datum, the Memphis datum, the Mean Gulf Level (MGL), the Mean Sea Level (MSL), the National Geodetic Vertical Datum (NGVD) 1929, and the North American Vertical Datum 1988 (NAVD88). The official geodetic datum currently prescribed by the USACE is NAVD88 (USACE 2010). In addition to these different geodetic datums, hydraulic datums are in use by the USACE for rivers, lakes, and reservoir systems. Hydrographic surveys from the Mississippi River are typically based on a low water pool or discharge reference, such as a low water reference plane (LWRP), an average low water plane (ALWP), or a low water (LW) plane. The following technical note is intended to provide background information about legacy datums used in the LMV to permit comparison of historic maps, charts, and surveys pertaining to the Mississippi River in the LMV. The purpose of this report is to provide background information and history of different published horizontal and vertical datums used for presentation of hydrographic survey data from the Mississippi River. The goal is to facilitate understanding of differences with comparison to other historic surveys for change-detection studies along the river. Conversion values are identified herein for the earlier surveys where appropriate, and methods are presented here to evaluate the differences between earlier and later charts and maps. This report is solely intended to address the LMV area and historic surveys made there. This note is not applicable to areas outside of the LMV. Throughout this technical note, historic hydrographic surveys and data from the Memphis, TN, to Rosedale, MS, reach will be used as examples of features of interest for discussion purposes. Selected historic hydrographic survey sheets at Helena, AR, are included as Plates 1 to 3 (Appendix C) of this document and will be used as examples for discussion purposes.

  • A Study on the Delta-Bullington Irregular Terrain Radiofrequency Propagation Model: Assessing Model Suitability for Use in Decision Support Tools

    ABSTRACT: Modeling the propagation of radiofrequency signals over irregular terrain is both challenging and critically important in numerous Army applications. One application of particular importance is the performance and radio connectivity of sensors deployed in scenarios where the terrain and the environment significantly impact signal propagation. This report investigates both the performance of and the algorithms and assumptions underlying the Delta-Bullington irregular terrain radiofrequency propagation model discussed in International Telecommunications Union Recommendation P.526-15. The aim is to determine its suitability for use within sensor-planning decision support tools. After reviewing free-space, spherical earth diffraction, and terrain obstacle diffraction losses, the report discusses several important tests of the model, including reciprocity and geographic continuity of propagation loss over large areas of rugged terrain. Overall, the Delta-Bullington model performed well, providing reasonably rapid and geographically continuous propagation loss estimates with computational demands appropriate for operational use.

  • Employee Spotlight: Regulatory Supervisor Ben Pitcock

    In any business, it's the people that make it work. Without a team, organizations fail. On top of everything else valued, the U.S. Army Corps of Engineers Memphis District values every one of its employees very much. To show how much we value them, we highlight one district employee every month by asking about their position, what it’s like to work for the Corps, and how they got to where they are today. This month, we are highlighting Regulatory Division Supervisor Benjamin Pitcock.