Empirical Reservoir Eutrophication Modelling with Oklahoma Calibration R package okBATHTUB version 0.1.11 Empirical reservoir water quality modelling using Walker's 'BATHTUB' Model 1 (second-order available-phosphorus sedimentation) from Walker (1985) <https://hdl.handle.net/11681/13884> and Walker (1996) <https://hdl.handle.net/11681/4353> as the default retention model. The Vollenweider (1976) hydraulic- residence form and the equivalent formulation of Larsen and Mercier (1976) are available as alternatives. Predicts in-lake total phosphorus, total nitrogen, chlorophyll-a, and Secchi depth from tributary nutrient and hydraulic loading inputs, and computes Carlson (1977) <doi:10.4319/lo.1977.22.2.0361> Trophic State Indices. Optional Oklahoma-specific chlorophyll and Secchi regression coefficients are provided, calibrated from publicly available state lake monitoring data. Supports single-segment and multi-segment reservoir configurations and load-reduction scenario analysis. Designed to complement watershed loading models such as the Soil and Water Assessment Tool ('SWAT'; <https://swat.tamu.edu>) and the U.S. EPA Hydrologic and Water Quality System ('HAWQS'; <https://hawqs.tamu.edu>) in a two-model nutrient management workflow. Software Depends: R (>= 4.1.0) Imports: utils Suggests: ggplot2 (>= 3.4.0), dplyr (>= 1.1.0), tidyr (>= 1.3.0), stringr (>= 1.5.0), knitr, rmarkdown, testthat (>= 3.0.0) Jordon Henderson <jordon.henderson@owrb.ok.gov> Comprehensive R Archive Network (CRAN) Jordon Henderson [aut, cre, cph] MIT + file LICENSE (https://CRAN.R-project.org/package=okBATHTUB/LICENSE) 2026-06-24 application/tgz https://CRAN.R-project.org/package=okBATHTUB doi:10.32614/CRAN.package.okBATHTUB