What is it?
There are two ways to assign pumping wells into the model:- attributing all of the pumping (withdrawal or injection) the nearest model node (for either a 2D or 3D model)
- allocating withdrawals from a single well to the different model nodes (2D or 3D) based on a transmissivity-based weighting scheme. This is useful when using a spatially-explicit hydraulic conductivity raster (2D models) or a Transition Probability borehole simulation (3D models).
In a 3D model, the hydraulic conductivity and interval length of each computational layer is used to compute the transmissivity for each layer. The final pumping rate allocated to each layer is weighted by the layer’s transmissivity. A similar scheme is applied in the horizontal direction, i.e., withdrawals from a single well were allocated to the nearest four nodes, where weightings were assigned based on the distance to the node and the hydraulic conductivity of the model cell.