Component 1: River Reach File.
NWPCAM Versions 1.5, 1.6, and 2.1 use Reach File Version 3 (RF3).
Component 2: Database Management System Linked to the Reach File.
With RF3 as the central hydrologic construct, NWPCAM links data, such as point source loadings, NPS loadings, and land cover data to the Reach File to support pollution control scenario definitions, models, and analyses of results. Modeling results are incorporated into the databases to support subsequent modeling components.
Component 3: Models.
NWPCAM utilizes a series of linear models plus Eutro-WASP and Toxi-WASP. These models simulate the fate and transport of pollutants as they move through the surface water network.
Component 4: Policy/Scenario Definition.
NWPCAM has implemented simplified scenario definitions, such as % change in a pollutant loadings category as well as definitions for very specific policies, such as proposed guidelines for Meat Processing plants and complex scenario definitions such as AFO/CAFO.
Component 5: Water Quality Effects.
The water quality effects are related to the policy definitions and reflect the capabilities of the components 1, 2, and 3 to perform the required analyses. For example, NWPCAM?s capabilities to evaluate complex AFO/CAFO scenarios is a function of the data content of Component 1 and the software tools built into Components 3 and 4.
Component 6: Economic Benefits (Fig. ES-2).
This component is a primary requirement for NWPCAM capabilities. This component has been used in a variety of policy analyses for EPA. These analyses include Clean Water Act retrospective, Stormwater Phase II, AFO/CAFO, and Meat Processing analyses.