Actual soiling of vehicles is a function of both
soiling index can be obtained for the
soil type and the amount of rain or wet condi-
installation. This is given by equation 3-1.
tions expected in the training areas.
Therefore, climatic data must be provided in
Si = StxFc
order to fully assess the potential for vehicle
The soiling index will be used to predict times and determine
soiling. Arid regions would have minimum
the need for a prewash.
soiling potential where rainy regions would
have maximum soiling potential. By assigning
Climatic data. As previously stated, climatic data at
a climatic factor (Fc) to the area, ranging from
the installation is necessary. In addition to amount
1 being arid to 2 being very rainy or wet, and
of rain, seasonal variations in moisture and
multiplying this by the soil type number, a
temperature are needed. Areas with long periods of