Gaining guidance for the future

TRWD has invested considerable time and money into developing watershed and reservoir models for most of the lakes in its system. Currently, a model is also being developed for the Trinity River through the Fort Worth area. These models are used to better understand these complex systems and help manage them into the future.


Modeling Programs

Tools for change
The EPA developed WASP model is the primary model TRWD has utilized for reservoir modeling. The dynamic computer model allows the reservoir to be evaluated horizontally and vertically with inputs for hydrology, nutrient loads, physical parameters (temperature and oxygen), light saturation, and phytoplankton. The output for the model is given on a daily time step for a specified unit of time between one year and ten years. This allows the reservoir to be evaluated annually or seasonally and over long term variable hydrologic conditions.
Texas A&M developed Soil and Water Assessment Tool (SWAT) has been utilized for modeling watersheds that contribute to TRWD reservoirs. SWAT is a GIS based platform that used spatial information on soil type, topography, landuse and land management practices, and creek channelization to estimate hydrology, sediment loads, and nutrient loads to the reservoir. The primary purpose of the watershed model is for use for developing Watershed Protection Plans or for developing continuous loads to the reservoir for use in the reservoir (WASP) model.
Currently, two models are under development for the Trinity River. PCSWMM is a watershed model used to simulate runoff from the drainage basin that contributes to the Trinity River floodway. The model will simulate flow and loadings to the river. The output from this model is used for input to a model for the actual river, Ce-Qual-W2. This model will take the information from the watershed and simulate the impacts on the river in terms of both flow and concentrations of sediment, chl-a, and nutrients.