User's guide of Proceessing Modflow 5.0

Processing Modflow 207
5.5 The Water Budget Calculator
There are situations in which it is useful to calculate flow terms for various subregions of the
model. To facilitate such calculations, the computed flow terms for individual cells are saved in
the file BUDGET.DAT. These individual cell flows are referred to as cell-by-cell flow terms, and
are of four types: (1) cell-by-cell stress flows, or flows into or from an individual cell due to one
of the external stresses (excitations) represented in the model, e.g., pumping well or recharge;
(2) cell-by-cell storage terms, which give the rate of accumulation or depletion of storage in an
individual cell; (3) cell-by-cell constant-head flow terms, which give the net flow to or from
individual constant-head cells; and (4) internal cell-by-cell flows, which are the flows across
individual cell faces. In the file BUDGET.DAT, the flow between the cells [J, I, K] and [J+1, I,
K] is denoted by FLOW RIGHT FACE, the flow between the cells [J, I, K] and [J, I+1, K] is
denoted by FLOW FRONT FACE, and the flow between the cells [J, I, K] and [J, I, K+1] is
FLOW LOWER FACE. The Water Budget Calculator uses the cell-by-cell flow terms to
compute water budgets for the entire model, user-specified subregions, and in- and outflows
between adjacent subregions. Refer to Step 5: Calculate subregional water budget of Section
2.1 for details.
5.6 The Graph Viewer
To activate the graph viewer, select an appropriate menu item from the Run