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SLAMM and P-8 Models

This section of the Wisconsin DNR Runoff Management web site is intended for use by highly technical professionals. The following links are to the US Geological Survey Water Resources Division - Wisconsin District Office, for SLAMM (Source Loading and Management Model) and P-8 (Program for Predicting Polluting Particle Passage thru Pits, Puddles, & Ponds). Both SLAMM and P-8 can be used to predict pollutant loads and demonstrate compliance with the requirements stipulated in NR151 for urban areas.


WinSLAMM (Source Loading and Management Model for Windows) was developed to evaluate nonpoint source pollutant loadings in urban areas using small storm hydrology. The model determines the runoff from a series of normal rainfall events and calculates the pollutant loading created by these rainfall events. The user is also able to apply a series of control devices, such as infiltration/biofiltration, street sweeping, wet detention ponds, grass swales, porous pavement, or catchbasins to determine how effectively these devices remove pollutants.

P-8 Urban Catchment Model

P-8 is a model for predicting the generation and transport of storm water runoff pollutants in urban watersheds. The model has been developed for use by engineers and planners in designing and evaluating runoff treatment schemes for existing or proposed urban developments. Predicted water quality components include suspended solids (five size fractions), total phosphorus, total Kjeldahl nitrogen, copper, lead, zinc, and total hydrocarbons. Simulated BMP types include detention ponds (wet, dry, extended), infiltration basins, swales, and buffer strips. The model is used to examine the water quality implications of alternative treatment objectives.

See Recarga Model for information on modeling the performance of infiltration basins and bioretention devices.

Last revised: Monday May 22 2017