Baltimore Ecosystem Study: Code for calculations of annual pharmaceutical loads at Gwynns Falls Carroll Park

Code for analyses presented in: Fork, M.L., J. Fick, A.J. Reisinger, and E.J. Rosi. "Dosing the coast: Leaking sewage infrastructure delivers large annual loads and dynamic mixtures of pharmaceuticals to urban rivers." In press at Environmental Science and Technology. Two markdown files contains code to pre-process other data and to analyze grab samples from BES streams collected weekly from 2 Nov 2017 through 15 Nov 2018 and analyzed for 92 target pharmaceuticals. Data and methods are available via EDI at https://doi.org/10.6073/pasta/36453abc14ce8d6a33711231fdee9792. Briefly, the analyses here: A) examine spatial and temporal variability in pharmaceutical detections and concentrations among 7 BES watersheds, and B) combine measured concentrations at the watershed outlet (GFCP) with USGS streamflow data to estimate annual loads of pharmaceuticals by resampling or by interpolating concentrations over the discharge record.