Computer models in assisting quantification of ecological and social effects Computer models, although they have limitations, can be run quickly to assess the possible cumulative effects on the anticipated benefits of any water control proposal. Computer models often involve probability on the basis of accumulated data, which provide foundation for reliable prediction. Many diverse considerations and interactions involved in planning long-term water resource projects are becoming so numerous that evaluation unaided by computing assistance is too unreliable.Computer models in assisting quantification Computer models in assisting quantification of ecological and social effects of ecological and social effects ¾ Computer models, although they have limitations, can be run quickly to assess the possible cumulative effects on the anticipated benefits of any water control proposal. ¾ Computer models often involve probability on the basis of accumulated data, which provide foundation for reliable prediction. ¾ Many diverse considerations and interactions involved in planning long-term water resource projects are becoming so numerous that evaluation unaided by computing assistance is too unreliable