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  • Employee Spotlight: Robin Nitcher

    Most U.S. Army Corps of Engineers’ lake projects are within 50 miles of a major metropolitan area. Many of those who work for our lake and project offices have grown up in the community they work in. Sometimes, those who grew up in the project’s backyard are the best stewards for the it. One such steward is Robin Nitcher, administrative officer at Pomona Lake project. Nitcher grew up three miles from Pomona Lake located in Vassar, Kansas, and would frequently visit before she became an employee. In May 1986, she started as seasonal clerk before working her way to a permanent position. She worked her first stretch at Pomona Lake until 2008 and then transferred to Melvern Lake. She worked at Melvern Lake for two years before transferring to Perry Lake to work as an administrative officer.

  • Application of a Satellite-Retrieved Sheltering Parameterization (v1.0) for Dust Event Simulation with WRF-Chem v4.1

    Abstract: Roughness features (e.g., rocks, vegetation, furrows) that attenuate wind flow over the soil surface can affect the magnitude and distribution of sediment transport in aeolian environments. Existing transport models often rely on vegetation attributes derived from static land use datasets or remotely sensed greenness indicators to incorporate sheltering effects on simulated particle mobilization. These approaches do not represent the 3D nature or spatiotemporal changes of roughness element sheltering and ignore the sheltering contribution of nonvegetation roughness features and brown vegetation common to dryland environments. We used an albedo-based sheltering parameterization in a dust transport modeling application of the Weather Research and Forecasting model with Chemistry (WRF-Chem). This method estimates sheltering effects on surface wind friction speeds and dust entrainment from the shadows cast by subgrid-scale roughness elements. We applied the albedo-derived drag partition to the Air Force Weather Agency (AFWA) dust emission module and studied simulated PM10 concentrations using the Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model as implemented in WRF-Chem v4.1. Our results demonstrate how dust transport simulation and forecasting with the AFWA dust module can be improved in vegetated drylands by calculating dust emission flux with surface wind friction speed from a drag partition treatment.

  • Small Plot Applications of Florpyrauxifen –Benzyl (Procellacor SC™) for Control of Monoecious Hydrilla in Roanoke Rapids Lake, NC

    Abstract: Four demonstration plots were selected at Roanoke Rapids Lake, NC to evaluate water exchange and aqueous herbicide residues in stands of submersed aquatic vegetation (SAV) following treatment with rhodamine wt dye and florpyrauxifen-benzyl to control monecious hydrilla. Florpyrauxifen-benzyl (Procellacor™ SC) was applied in combination with Rhodamine WT (RWT) at two of the plots. Dye measurements and herbicide residue samples were collected at specific time intervals to draw comparisons between herbicide and RWT dye dissipation. The two additional plots served as reference plots to the treatment plots. Pre- and post-treatment vegetation surveys were conducted to evaluate monoecious hydrilla control and non-target species response. RWT dye and herbicide residue data indicated rapid water exchange was occurring with each treatment plot. As a result, florpyrauxifen-benzyl concentration and exposure times (CETs) towards monoecious hydrilla were not sufficient to achieve adequate control by 4 weeks after treatment (WAT). To reduce the impact of hydraulic complexity and improve herbicide efficacy, treatments should coincide with minimal reservoir discharge events to extend herbicide CET relationships. Evaluations of florpyrauxifen-benzyl on late season, mature plants may have impacted herbicide efficacy. Evaluations should be conducted earlier in the growing season, on young, actively growing plants, to discern potential differences in efficacy due to treatment timing and phenology. More information on herbicide concentration and exposure time relationships for monoecious hydrilla should be developed in growth chamber and mesocosm settings to improve species selective management of monoecious hydrilla in hydrodynamic reservoirs.

  • New Orleans to Venice by way of Memphis

    In line with USACE’s top priority, public safety, the Memphis District is part of a huge undertaking to design, procure, and construct hurricane and storm risk reduction features and ensure the Mississippi River remains viable from New Orleans to Venice, Louisiana.

  • Improvement project closes boat launch at Chena project

    The U.S. Army Corps of Engineers – Alaska District is closing the Moose Creek Landing recreational parking lot and boat ramp beginning June 15 while construction is underway to improve public access at the site. The project is expected to be completed by late August.

  • MKARNS Nav Notice No. SWL 23-24 Lock 9 Unscheduled Lock Closure

    Due to unforeseen difficulties with the work mentioned in Navigation Notice No. SWL 23-19, Arthur V. Ormond Lock (No. 9) NM 176.9 is temporarily closed to traffic. Crews are on site working and will have the Lock opened as soon as the problem can be resolved. A subsequent Navigation Notice will be issued once the Lock has been opened to traffic.

  • Public meetings scheduled for Lower San Joaquin River Project

    The U.S. Army Corps of Engineers Sacramento District and the San Joaquin Area Flood Control Agency have released a draft Supplemental Environmental Assessment (SEA) and a draft Supplemental Environmental Impact Report (SEIR), respectively, for the Lower San Joaquin River Project, Reach 30L of Tenmile Slough (TS30L).

  • Extraction and Analysis of Per- and Polyfluoroalkyl Substances (PFAS) from Meals Ready-to-Eat (MRE) Films Using GC-MS and LC-MS/MS

    OBJECTIVE: This work was in response to the Defense Logistic Agency’s (DLA) Subsistence Network Broad Agency Announcement, BAA-0003-16 addressing 2019 NDAA Section 329 that states packaging materials used for Meals Ready-to-Eat (MRE) that contact food products must be free of per- and polyfluoroalkyl substances (PFAS). This was addressed by determining the presence or absence of PFAS on MREs by extraction followed by gas chromatography mass spectrometry (GC-MS) and liquid chromatography tandem mass spectrometry (LC-MS/MS). Any samples positive for PFAS were quantitated using LC triple quadrupole (QqQ) MS at the US Army Engineering and Research Development Center (ERDC) and by high resolution quadrupole time-of-flight (qTOF) MS and GC-MS at Oregon State University (OSU).

  • PUBLIC NOTICE: Village of Buckhorn Sanitary Sewer Relocation, Raw Water Intake, and Water Treatment Plant Project

    The U.S. Army Corps of Engineers (USACE) Louisville District has completed a draft Environmental

  • USACE Memphis christens replacement, $25.5M bank grading unit "Grader 1"

    The U.S. Army Corps of Engineers Memphis District officially launched its new, $25.5 million Bank Grading Unit (BGU), “Grader 1”, with a christening ceremony held on the afternoon of May 2 at a boat ramp located in downtown Memphis, Tennessee. Event attendees included Mississippi Valley Division Commander Maj. Gen. Diana Holland, Memphis District Commander Col. Brian Sawser, Grader 1's project delivery team and project partners, and several members from the Memphis District Employee and Retiree Communities. Vessel christenings are widely considered an important part of nautical culture with many associated customs practiced for centuries now. While variations do exist, the overall purpose is to request protection for the vessel and crew while navigating the waterways of the world.