Although module topog is executed as part of MOM, designing by executing MOM is similar to using a sledge hammer to work with tacks. The preferred method is to do the construction by executing script run_topog from a MOM_UPDATES directory as described for module grids in Section 16.3. Put script run_topog in the MOM_UPDATES directory and it will execute module topog in a stand alone mode by enabling option drive_topog. The execution will produce a file results_topog which should be inspected. Once topography and geometry are judged as satisfactory, module topog along with the resulting topography and geometry are available to MOM during model executions. This is done by not including the option drive_topog in the list of options within the run_mom script.