EPA Report: A Review of Watershed and Water Quality Tools for Nutrient Fate and Transport

Original post date: Mar 12, 2020 1:58:23 AM

Purpose

The report provides a comprehensive review of tools used to model the fate and transport of nutrients (mainly nitrogen, phosphorus, TSS) within watersheds. Its primary goal is to guide decision-makers, researchers, and watershed managers in selecting and applying models appropriate to their data, objectives, and watershed conditions.

Evaluation Criteria

Each tool was evaluated based on:

Purpose and application context

Pollutants simulated (nutrients, sediment, etc.)

Spatial and temporal scale

Ease of use and user expertise required

Data input needs

Calibration/validation capabilities

Strengths and limitations

Key Findings

No one-size-fits-all tool/model selection should depend on:

Project goals (screening vs. detailed simulation)

Available data and resources

User experience

Geographic and temporal scope

Simple models are good for screening and planning, while complex models support regulatory assessments, BMP evaluation, and long-term forecasting.

Uncertainty analysis, model calibration, and validation are crucial for credible results.

Recommendations

Match model selection with specific project needs.

Improve documentation, transparency, and inter-model comparisons.

Encourage the integration of real-time monitoring data, remote sensing, and machine learning to improve accuracy and usability.

Support collaborative, cross-agency use of standardized tools for better regulatory and restoration planning.

Download this document from the EPA governmental site