Simulation Models

Simulation models have become an integral part of watershed assessment, planning and analysis.

World Water Watch experts have developed and utilized many simulation models at all levels: field-scale, in-stream, watershed, and river basin.

Two examples of the types of simulation models being used are:

WQMSA

The Water Quality Monitoring Station Analysis (WQMSA) model incorporates spatially-based surface and subsurface contaminant transport variables in order to recommend the strategic placement of stations within a given watershed for targeting contaminant loads. The WQMSA model has been designed to be very practical and adaptable for use in predominantly small watersheds located in any part of the world.   

GWLF

The Generalized Watershed Loading Function (GWLF) model uses a GIS software (ArcView) interface. The interface and model are called AVGWLF, and provide the following functions: 

1. Derive input data for GWLF for use in an “impaired” watershed
2. Simulate nutrient and sediment loads within the impaired watershed
3. Compare simulated loads within the impaired watershed against loads simulated for a nearby “reference” watershed that exhibits similar landscape, development and agricultural patterns.

PRedICT

 Pollution Reduction Impact Comparison Tool (PRedICT) was developed for use in evaluating the implementation of both agricultural and non-agricultural NPS (non-point source) reduction strategies at the watershed level. This tool allows the user to create various “scenarios” in which current landscape conditions and pollutant loads (both point and non-point) can be compared against “future” conditions that reflect the use of different pollution reduction strategies. Some strategies are agricultural and urban best management practices (BMPs), the conversion of septic systems to centralized wastewater treatment, and upgrading of treatment plants from primary to secondary to tertiary.

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