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Bioconcentrations Of Heavy Metals Copper, Chromium (Tot), Lead, Zinc, Nickel And Mercury In The Missouri River 1991
US Army Corps of Engineers
The presence of heavy metals within aquatic environments can be attributed to sources such as industry, municipal discharges, agriculture and natural processes which release various amounts into natural systems. Metals such as copper, zinc and chromium are listed as essential micronutrients for many plant and animal species. Of potential concern, however, is the tendency of heavy metals to accumulate within the food webs of ecosystems. Classified as biologically hard to degrade, heavy metals may concentrate to significant amounts within the trophic levels of a particular ecosystem. At these increased concentrations many of these heavy metals become toxic to living organisms. …
Investigation Of Channel Degradation 1991 Update Missouri River Gavins Point Dam To Platte River Confluence
US Army Corps of Engineers
1. PURPOSE. This report is the fifth in a series of updates to Volume IV, supporting Technical Report, Missouri River Degradation. Volume IV is a part of the August 1981 Review Report of the water and Related Land Resources Management study for Metropolitan Sioux city and Missouri River Iowa, Nebraska, and South Dakota. This report, along with future updates, will provide the information necessary for proper management of the Missouri River in reference to degradation.
2. SCOPE. This report incorporates water surface profile and hydrographic survey data from the 1989 and 1990 water years for the purpose of updating the …