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  • Below average runoff continues for upper Missouri River Basin in 2025

    The updated 2025 calendar year runoff forecast for the Missouri River Basin above Sioux City, Iowa, continues to be below average. January runoff in the Missouri River Basin above Sioux City was 0.7 million acre-feet, 92% of average. Runoff was near or below average for most of the Missouri River Basin, and most of the upper basin had below-normal precipitation.
  • Engineering With Nature: Natural Infrastructure for Mission Readiness at U.S. Navy and Marine Corps Installations

    Abstract: This book illustrates some of the current challenges and hazards experienced by military installations, and the content highlights activities at eight U.S. Navy and Marine Corps military installations to achieve increased resilience through natural infrastructure.
  • Below-average runoff and reservoir storage expected for the Missouri River Mainstem System in 2025

    For the 2024 calendar year, Missouri River basin runoff above Sioux City, Iowa totaled 23.3 million acre-feet, 91% of average. Dry conditions continue to affect the upper Missouri River Basin at the start of the 2025 calendar year, so the U.S. Army Corps of Engineers is forecasting below-average runoff into the mainstem reservoir system. For 2025, runoff in the Missouri River basin above Sioux City, Iowa is forecast to be 20.2 MAF, 79% of average.
  • Numerical Modeling of Supercritical Flow in the Los Angeles River: Part II: Existing Conditions Adaptive Hydraulics Numerical Model Study

    Abstract: The Los Angeles District of the US Army Corps of Engineers is assisting the City of Los Angeles with restoration efforts on the Los Angeles River. The city wishes to restore portions of the channelized river to a more natural state with riparian green spaces for both wildlife and public recreation usage. The Los Angeles River provides an important role from a flood-control perspective, and functionality needs to be preserved when contemplating system modifications. This report details the development of an Adaptive Hydraulics numerical model capable of modeling this complex system consisting of both subcritical and supercritical flow regimes. The model geometry was developed to represent the existing conditions system for future usage in quantifying the impact associated with proposed restoration alternatives. Due to limited hydraulic data in the study area, an extensive model validation to observed data was not possible. A model was developed and simulated using the most appropriate input parameters. Given the lack of measured data for model validation, an extensive number of sensitivity simulations were completed to identify the most impactful parameters and quantify a reasonable level of confidence in the model results based on the uncertainty in the model inputs.
  • U.S. Army Corps of Engineers issues scoping letter for comments on the Central and Southern Florida Flood Resiliency Section 203 Study – Broward Basins

    JACKSONVILLE, Fla. (Dec. 6, 2024) – The U.S. Army Corps of Engineers (USACE), Jacksonville District is beginning preparation of a National Environmental Policy Act (NEPA) document for the Central and Southern Florida (C&SF) Flood Resiliency (Section 203) Study for Broward Basins on behalf of the non-federal interest, the South Florida Water Management District (SFWMD). The purpose of the study is to develop strategies for managing inland flood risks in Broward County, Florida, which is critical for enhancing the community's resilience against flood risks. USACE is currently gathering information to define issues and concerns that will be addressed in an analysis to be prepared in compliance with the NEPA.
  • Gavins Point Dam releases reduced to winter release rate

    The U.S. Army Corps of Engineers began reducing the Gavins Point releases to the winter release rate on Nov. 23 with the navigation flow support season ending on Dec. 1 at St. Louis. “Releases from Gavins Point Dam are being reduced to the 12,000 cubic feet per second winter release rate by mid-December,” said John Remus, Chief of the Missouri River Water Management Division. “We will closely monitor river conditions, and releases will be adjusted to the extent practical to lessen the impacts of river ice formation on stages in the lower river.” Releases were at 32,000 cfs prior to the reductions.
  • Gavins Point Dam releases to be reduced to winter release rate

    Gavins Point Dam releases will be reduced in late November as flow support to navigation ends. Releases are currently 32,000 cubic feet per second.
  • Comite Diversion Numerical Model Study

    Abstract: The Comite River diversion project is designed to reduce flooding along the Comite and Amite Rivers during flood events by diverting flow from the Comite River into the Mississippi River above Baton Rouge, Louisiana. The flow is diverted from the Comite River along a diversion canal to the Lilly Bayou Control structure. This structure allows the Comite River flow to enter the Mississippi River floodplain. A numerical model was created to evaluate the impacts associated with this addition of water to the Mississippi River. A 2D Adaptive Hydraulics numerical model was created to quantify the system impacts associated with the diverted flow in conjunction with possible system modifications to control the flow pathway. The impact of the diversion was determined to be heavily dependent on the flow and stage of the Mississippi River. At higher stages and flows, the flow diverted by the Lilly Bayou Control structure is negligible in relation to the much larger Mississippi River flow and therefore the impacts of the added flow are significantly less than at lower Mississippi River stages. At lower Mississippi River flows and stages, the added flow from the Lilly Bayou Control structure has a larger impact on the inundation due to the larger relative amount of diverted flow in relation to the Mississippi River. Ultimately, the diverted Comite River flow has some incremental increase in water levels at all Mississippi River stages.
  • September runoff below average; October public meetings

    September runoff in the upper Missouri River Basin was well-below average, continuing the trend of below-average runoff in 2024. “Although Montana precipitation was wetter-than-normal in September, much of the basin was very dry and warm, causing the September runoff in all reaches above Gavins Point to be well-below average,” said John Remus, chief of the U.S. Army Corps of Engineers’ Missouri River Basin Water Management Division.
  • Sharing the load: Partnering to keep people safe

    To prevent flooding in a desert, sometimes you must build a dam without a river.