![]() ![]() The shape of the capture area becomes clear. This second set of 20 flowlines starts at the base of the well screen and flowlines are computed backwards until an area with no gradient is reached, the two highest points of the water divide. Backward / n lines = 20 / levels = 1 / The yellow flowlines do not reach up to the groundwater divide. When you cannot specify the number of lines, you are not in the well node. Walking mode / / Next label / select "well" / / ĭrawing mode / / Backward / n lines = 20 / A more accurate view can be obtained with 3D flowlines. The four points give an impression of the shape of the drawdown cone. They are on the water divide at the boundary of the drawdown cone. W, NNE, E and SSE of the well are locations where the contour lines are relatively far apart, indicating areas of low head gradient. Right-click / Fit to scale / Drawing mode / H1 / / Choose a small interval = 0.1 / ĭrawdown at the well is found to be 14.186 m. To find this capture zone we can draw the contours of the water table and see the shape of the drawdown cone. All other precipitation in this model flows to the model boundary. There is a well-defined capture zone where all infiltrated precipitation flows toward the well. The discharge of 120*24 m 3/d is assigned to all nodes with label "well", which is only one node in this case. Since the well is now labelled, we can specify any well discharge in the batch-file: Note that 88% of all precipitation (21,120 m 3/d) is boundary outflow. The batch-file editor shows the following textĬheck the box "Phreatic top aquifer" or (and) change the Run command: RUN phreat=1. Zoom in and click on this node / Input mode / enter the text "well" / Enter / Q1 / 120*24 / Enter The small square in the centre is drawn around the node with Label "Fixed node 7". Note that the model consists of 7 files, including the batch-fileĬlose the Project Manager, save the model as "Lesson 10" The well discharges 120 m 3/hour somewhere in the centre of our unconfined triangular island.Ĭlick "Lesson 8.fpr" to load the model we saved at the end of Lesson 9 When we created the grid in Lesson 8, we added a Fixed node at the location of a well at (2620, 3025). Lesson 10A: Water divide and Capture zone. ![]()
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