https://0011235813.r-universe.devRecent package updates in 0011235813R-universehttps://github.com/0011235813.pnghttps://0011235813.r-universe.devTue, 02 Jun 2026 16:27:21 GMTjordon.henderson@owrb.ok.gov (Jordon Henderson)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.https://github.com/r-universe/0011235813/actions/runs/26840755641Tue, 02 Jun 2026 16:27:21 GMTokBATHTUB0.1.10successhttps://0011235813.r-universe.devhttps://github.com/0011235813/oklahoma-bathtubgetting-started.Rmdgetting-started.htmlGetting Started with okBATHTUB2026-05-09 18:05:282026-05-11 18:10:47hawqs-linkage.Rmdhawqs-linkage.htmlLinking OK-HAWQS/SWAT Outputs to okBATHTUB2026-05-09 18:05:282026-05-12 18:12:40oklahoma-workflow.Rmdoklahoma-workflow.htmlOklahoma Reservoir Workflow2026-05-09 18:05:282026-05-12 15:04:39