The GOSSYM/COMAX Expert System currently requires extensive and expensive soil sampling and physical properties tests prior to implementation. A hypothesis that the GOSSYM yield predictions were not different for soil hydrology files of the same texture was developed. Simulations were conducted on 147 soils with all other conditions held constant. Yield predictions were grouped according to texture and tested against the hypothesis. As a result of these tests, six genera soil hydrology files were developed that represent six soil textural groupings. If soil texture changes within the soil profiles, the values form the general soil hydrology files can be combined to represent field with horizons of different textures. The existence of these general soil hydrology files allows the producers to implement GOSSYM/COMAX without the time and expense of the soil physical property tests.