The calibration process requires:
analysis of historical data and derivation of time series of observed precipitation, temperature, and potential evapotranspiration,
calibration of hydrologic model parameters so that simulated streamflow agrees with observed data,
and implementing the calibrated parameters and data analysis information into the operational forecast system.
Analysis of historical data is used to derive multi-year time series of mean areal precipitation, temperature, and potential evaporation.
Time series of precipitation are derived using the Mean Areal Precipitation preprocessor (MAP) while corresponding mean areal time series of temperature and potential evaporation are produced using the MAT and MAPE preprocessors, respectively.
Analysis begins with the selection of stations to be used to derive the historical time series of mean areal precipitation, temperature, and in some cases evaporation.
