Flow Calibration in BASINS
Preliminary NPSM Parameter Settings
- Use the "Add/Remove Reaches" or "Setup Reach Network" buttons to
confirm reach structure.
- Change down stream reach length, delta h, and elevation to match
measurements taken in the delineated watershed if needed with the "Reach
- If absolutely necessary, change F-Table. See BASINS
Technical Note 1.
- Choose "Add..." to identify the most appropriate WDM station in terms
of proximity and altitude.
- If necessary, check box labeled "Write this station to PLTGEN file"
for later analysis of weather data (displayed in postprocessor under
"Weather Station"). Upon running the model, a separate file will be
created and located in "BASINS\modelout\project-name" directory.
- Provide at least a two year warm-up period prior to the study period
so that the steady state variables can reach dynamic equilibrium.
- Understanding the nature of the watershed is essential for deciding
what HSPF parameters might be causing discrepancies in the observed
and simulated flows. For this reason, it is important to note the major
pervious and impervious land uses in the project and edit the land uses
to duplicate the real watershed condition.
- Also if major changes in land use have occurred in the study period
after the data were obtained, then it may be necessary to edit those
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- Load "Starter.def" file. These default parameter values for flow
were developed for a watershed in Georgia. They are a good starting
point for calibration of a watershed.
- Use the "Autoload" button to automatically assign for each landuse
name in the watershed to the landuse name in the default data file.
Landuse that do not match can be manually assigned.
- Do not assign pollutants for the initial calibration.