Chemical and physical data for analysis of nitrogen fluxes and nominal travel time in surface water

Data were collected from a former cranberry farm that was restored to a wetland in Plymouth, Massachusetts, called "Tidmarsh". Between 2016 and 2024, data included surface water discharges, total nitrogen and nitrate concentrations in surface water, and specific conductivity concentrations to determine surface water travel times. Data were used for the following objectives: (1) watershed-scale water quality modelling to determine sources of N to Tidmarsh, (2) weekly field measurements to quantify seasonal patterns of NO₃^- retention by Tidmarsh, and (3) bi-monthly injections of a conservative tracer to quantify solute residence time and its effect on NO₃^- retention by Tidmarsh.