If you read UK AIC 32/1998 (Pink 169) dated 24 March, you will see than on Pages 3 and 4, after each of Tables 1, 2, and 3, it says "......high wind velocity.........may reduce holdover time below the lowest time stated in the range". Obviously, the CAA thinks that an increase in wind velocity increases evaporation rate. However. they don't actually quantify the effect in numerical or percentage terms.