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Beaumont Basin Watermaster
2013 Reevaluation of the Beaumont Basin Safe Yield 3-Apr-15
Cumulative water budget error for the model was -0.01 percent. Both of these values are within
industry standards for model calibration (Hill and Tiedeman, 2007; Anderson and Woessner,
2002).
Another common measure of model calibration is the normalized root mean squared (RMS) of
the model residuals. A calibration residual is the difference between the model-generated head
value and the observed head value. RMS is defined by:
Where:
n = Number of observations,
R = Residual (ft).
The RMS is normalized by dividing by the observed head range in the model. The normalized
RMS is expressed as a percent with results less than 10 percent considered a reasonable model
calibration. The groundwater flow model developed for this analysis was calibrated with a
normalized RMS of 2.2 percent (see Figure 37).
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