Submitted to: Dryad Digital Repository
Publication Type: Database / Dataset
Publication Acceptance Date: 6/4/2021
Publication Date: 6/4/2021
Citation: Sohoulande Djebou, D.C., Szogi, A.A., Stone, K.C., Novak, J.M. 2021. Data from: Watershed scale nitrate-N abatement of instream wetlands: an appraisal using the soil and water assessment tool. Dryad Digital Repository. https://doi.org/10.5061/dryad.dfn2z351v.
Technical Abstract: These data are associated with the manuscript entitled: “Watershed Scale Nitrate-N Abatement of Instream Wetlands: An Appraisal Using the Soil and Water Assessment Tool” (doi: 10.13031/aea.13736). The study elucidated the watershed-scale nitrate-N abatement potential of constructed instream wetlands (ISWs). Hence, the Soil and Water Assessment Tool (SWAT) was used to model nitrate-N export in a highly agricultural watershed located in the Coastal Plain of North Carolina. SWAT was first calibrated and validated for streamflow and for nitrate-N export using data collected from the inlet and outlet of an experimental instream wetland. The validated SWAT model was used to simulate a decade of nitrate-N export under two scenarios: 1) watershed with ISWs implemented; and 2) watershed without ISWs. The results of the case study indicated that a watershed-wide implementation of ISWs is likely to curtail annual nitrate-N export by 49%. The study also evaluated cases where ISWs are implemented in selected percentage of sub-basins across the watershed. The outcomes show higher increments of nitrate-N curtailment when ISWs are implemented in the first top agricultural sub-basins. Hence, implementation of ISWs on selected sub-basins can mitigate nitrate-N from non-point sources and enhance water quality in the watershed’s stream network. The dataset provided here include input weather data used for SWAT, flow and nitrate-N observation data used to calibrate and validate SWAT, simulated data associated to figures and tables reported in the manuscript.