1. The problem statement, all variables and given/known data Both dams equally wide and equally high. The first dam holds back a very large lake, and the second dam holds back a narrow river. 2. Relevant equations Which dam has to be built more strongly? a.) the first dam b.) the second dam c.) both 3. The attempt at a solution i know it would be the second dam that holds back a narrow river, but how can i prove it mathematically/algebraically? how can i show the answer in ratio? -.- i need your help please. thanks!