{"pk":62418,"title":"Hydrologic Variability of the Cosumnes River Floodplain","subtitle":null,"abstract":"Natural floodplain ecosystems are adapted to highly variable hydrologic regimes, which include periodic droughts, infrequent large floods, and relatively frequent periods of inundation. To more effectively manage water resources and maintain ecosystem services provided by floodplains – and associated aquatic, riparian, and wetland habitats – requires an understanding of seasonal and inter-annual hydrologic variability of floodplains. The Cosumnes River, the largest river on the west-slope Sierra Nevada mountains without a major dam, provides a pertinent test case to develop a systematic classification of hydrologic variability. By examining the dynamics of its relatively natural flow regime, and a 98-year streamflow record (1908 – 2005), we identified 12 potential flood types. We identified four duration thresholds, defined as short (S), medium (M), long (L), and very long (V). We then intersected the flood duration division by three magnitude classes, defined as small-medium (1), large (2), and very large (3). Of the 12 possible flood types created by this classification matrix, the Cosumnes River streamflow record populated 10 such classes. To assess the robustness of our classification, we employed discriminant analysis to test class fidelity based on independent measures of flood capability, such as start date. Lastly, we used hierarchical divisive clustering to classify water years by flood type composition resulting in 8 water year types. The results of this work highlight the significant seasonal and inter-annual variability in natural flood regimes in Central Valley rivers.  The construction of water impoundment and flood control structures has significantly altered all aspects of the flood pulse.  Restoring floodplain ecosystem services will require re-establishing key elements of these historic flood regimes in order to achieve regional restoration goals and objectives.","language":"en","license":{"name":"Creative Commons Attribution 4.0","short_name":"CC BY 4.0","text":"Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.\n\nNo additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.","url":"https://creativecommons.org/licenses/by/4.0"},"keywords":[{"word":"Cosumnes River"},{"word":"environmental flow"},{"word":"flood regime"},{"word":"floodplains"},{"word":"floods"},{"word":"hydrologic analysis"},{"word":"instream flow"},{"word":"restoration"},{"word":"watershed"}],"section":"Research Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/71j628tv","frozenauthors":[{"first_name":"Eric","middle_name":"","last_name":"Booth","name_suffix":"","institution":"University of California, Davis","department":""},{"first_name":"Jeff","middle_name":"","last_name":"Mount","name_suffix":"","institution":"University of California, Davis","department":""},{"first_name":"Joshua","middle_name":"H.","last_name":"Viers","name_suffix":"","institution":"University of California, Davis","department":""}],"date_submitted":"2006-02-03T08:00:00Z","date_accepted":"2006-02-03T08:00:00Z","date_published":"2006-09-24T07:00:00Z","render_galley":null,"galleys":[{"label":"","type":"pdf","path":"https://journalpub.escholarship.org/jmie_sfews/article/62418/galley/48247/download/"}]}