Global Budgets The Global Budgets window summarizes the cumulative volumetric budgets and flow budgets at the end of any time step or stress period selected in the Output Control window for a particular results overlay, as well as the total cumulative volume in and out, total flow in and out, and the percent error for volume and flow budgets. Consult MODFLOW documentation for a definition of these variables. The Global Budgets window includes a Period and Step drop down list for navigating between the different stress periods and time steps. The up and down arrow keys will efficiently move you from one period to the next or from one time step to the next, depending on which drop down list has the focus. Only periods and time steps actually selected for output in the Output Control window are shown in the drop down list.