{"id":17961,"date":"2023-08-07T12:09:59","date_gmt":"2023-08-07T17:09:59","guid":{"rendered":"https:\/\/ewn.erdc.dren.mil\/?post_type=publications&#038;p=17961"},"modified":"2023-08-07T12:10:00","modified_gmt":"2023-08-07T17:10:00","slug":"long-term-nitrate-nitrogen-reductions-in-a-large-flood-control-reservoir","status":"publish","type":"publications","link":"https:\/\/ewn.erdc.dren.mil\/publications\/archive\/long-term-nitrate-nitrogen-reductions-in-a-large-flood-control-reservoir\/","title":{"rendered":"Long-term nitrate-nitrogen reductions in a large flood control reservoir"},"content":{"rendered":"\n<p>Flood-control reservoirs are common in the&nbsp;U.S.&nbsp;and several are located in highly agricultural regions of the Midwest. In this study, a mass balance of annual and seasonal NO<sub>3<\/sub>-N concentration and load reductions was calculated for Lake Red Rock, a large flood-control reservoir located on the Des Moines River downstream of the City of Des Moines, Iowa. Utilizing rare long-term upstream and downstream NO<sub>3<\/sub>-N monitoring records extending back in time 42&nbsp;years and combining this with estimates from tributary inputs, Lake Red Rock reservoir was found to remove an average of 7,379&nbsp;Mg NO<sub>3<\/sub>-N per year, representing 12.4&nbsp;% of the NO<sub>3<\/sub>-N inputs to the reservoir. Annual variations in NO<sub>3<\/sub>-N loss rate varied considerably (-2.9&nbsp;% to 41.3&nbsp;%) and were significantly related to annual&nbsp;reservoir water&nbsp;retention time. Combining study results with literature data, annual NO<sub>3<\/sub>-N reduction in Midwestern flood-control reservoirs was logarithmically related to average annual water retention time. Although flood-control reservoirs are designed primarily for flood protection, manipulating the reservoirs to achieve longer water retention times, particularly during periods of high NO<sub>3<\/sub>-N concentrations and loads, could be a strategy to alleviate impairments at downstream water suppliers and help state and federal agencies meet NO<sub>3<\/sub>-N reduction goals.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Flood-control reservoirs are common in the&nbsp;U.S.&nbsp;and several are located in highly agricultural regions of the Midwest. In this study, a mass balance of annual and seasonal NO3-N concentration and load reductions was calculated for Lake Red Rock, a large flood-control reservoir located on the Des Moines River downstream of the City of Des Moines, Iowa. [&hellip;]<\/p>\n","protected":false},"featured_media":17962,"template":"","tags":[60],"class_list":["post-17961","publications","type-publications","status-publish","has-post-thumbnail","hentry","tag-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Long-term nitrate-nitrogen reductions in a large flood control reservoir - Engineering With Nature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ewn.erdc.dren.mil\/publications\/archive\/long-term-nitrate-nitrogen-reductions-in-a-large-flood-control-reservoir\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Long-term nitrate-nitrogen reductions in a large flood control reservoir - Engineering With Nature\" \/>\n<meta property=\"og:description\" content=\"Flood-control reservoirs are common in the&nbsp;U.S.&nbsp;and several are located in highly agricultural regions of the Midwest. In this study, a mass balance of annual and seasonal NO3-N concentration and load reductions was calculated for Lake Red Rock, a large flood-control reservoir located on the Des Moines River downstream of the City of Des Moines, Iowa. 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