5/5/2023 0 Comments Mtasa velocity with vectors![]() ![]() Velocity.I = Flow.I / (SaturatedArea.I * porosity) Once the flows, areas, and porosity are assembled the groundwater flow velocity is computed using the following equations: Although porosity is not part of the MODFLOW inputs, using GMS you can specify porosity on a per cell basis. The final piece of information necessary for the calculation is porosity. If the particular cell is part of an unconfined aquifer then it is also necessary to get the computed head for the cell as the computed head is most likely below the top elevation of the cell. For the I and J directions it is necessary to use the top and bottom elevations that are specified in MODFLOW's discretization package. Next, the saturated area is calculated in the I, J, and K directions. If a particular cell contains a boundary condition that is withdrawing water (such as a well) then the flow in the I, J, and K directions is decreased based on the amount of flow leaving the cell through the boundary condition. ![]() First, the amount of flow in the I, J, and K directions for a given cell is read from the CCF file. Several pieces of information are required to compute groundwater flow velocity from a MODFLOW model. Beginning with version 8.2, GMS can now generate velocity vectors using information from the MODFLOW cell-to-cell flow (ccf) file. ![]()
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