Parameters
There are six major parameters in the snow cover model.
This includes the areal depletion curve which is not a single-valued parameter, but a series of numbers.
These are the parameters which typically have the greatest effect on the simulation results.
Thus, most of the effort during calibration should be devoted to determining the proper value of these parameters.
The major parameters in the snow model are:

SCF
      A multiplying factor which adjusts precipitation data for gage catch deficiencies
      during periods of snowfall and implicitly accounts for net vapor transfer and interception losses.
      At a point, SCF also implicitly accounts for gains or losses due to drifting.

MFMAX
      Maximum melt factor during non-rain periods, assumed to occur on June 21.

MFMIN
      Minimum melt factor during non-rain periods, assumed to occur on December 21.

UADJ
      The average wind function during rain-on-snow periods.

SI
      The mean areal water-equivalent above which there is always 100 percent areal snow cover.

Areal depletion curve
      Curve which defines the areal extent of the snow cover as a function of how much of the original snow cover remains

There are six minor parameters in the snow model.
These are parameters which normally can be determined in advance on the basis of a knowledge of the typical climatic and snow cover conditions for the area.
These initial estimates may require one or two slight adjustments, but the determination of the appropriate values for these parameters should always be a small part of the calibration process.