EPA PLET Training: Pollutant Load Estimation & BMPs

This EPA training video by Adrienne Donaghue, PhD Physical Scientist with the U.S. EPA Office of Water, provides hands-on demonstrations of PLET usage for estimating pollutant load reductions from BMPs across land uses like cropland, pastureland, user-defined, and urban areas. It covers navigating the web interface, data sources for auto-populated inputs, model structure, and applying the tool to estimate water quality improvements from watershed to farm-field scales. Key demonstrations include using the BMP calculator for combined efficiencies of multiple BMPs on one land use, and examples for watershed-based plans or evaluating nonpoint sources in impairments. Specific scenarios show load reductions for agricultural treatments, with timestamps for interface navigation (start to 24:25), detailed PLET demo (24:25-43:09), and Q&A (43:09-1:12:02). Practical insights emphasize site-specific modeling beyond field boundaries, integrating RUSLE2 for erosion, runoff calculations, and nutrient tracking. Resources link to PDF slides at farmlandinfo.org for further reference. For regenerative agriculture practitioners, it offers concrete steps to model conservation practices like filter strips or wetland projects, quantifying nitrogen, phosphorus, sediment, and BOD reductions to align with TMDL objectives and generate verifiable water quality credits. The training highlights workflow for baseline vs. implementation scenarios, adjusting soil nutrients, irrigation, and manure applications, making it actionable for designing resilient systems that capture stormwater, reduce erosion, and enhance water retention at scale.