Question

Legend Good Flow Gooo Laet ev ations Contour Spine Spline_shp1 ON 3633 1 Questions 1. Flow lines converge at some locations on the map. What does this indicate about the 2. Flow lines diverge (flow in opposite directions) at some locations on the map. What 3. Equipotential lines get further apart in some areas. What does this indicate about the 4. Where do you see errors on the flow lines drawn on the map? Describe the problem as groundwater flow system? What must be happening at these locations? does this indicate about the groundwater flow system? groundwater flow system? you see it.

Answer 1

1. The convergence of flow lines at some locations indicates that the water table is at a lower elevation. At such locations, groundwater discharge must be happening as the water is moving from a higher surface and converging towards a lower surface.

2. The divergence of flow lines at some locations indicates that the water table is at a higher elevation. At such locations, groundwater recharge must be happening as the water is diverging from a higher surface and moving towards a lower elevation.

3. Equipotential lines are further apart in some locations. This indicates that the groundwater flow system has a lower gradient due to an increase in the distance between two consecutive water surfaces. The increase in distance between the equipotential lines thus indicates a reduction in the gradient of the flow or the slope of the water surface.

4. The errors on the flow lines are seen at the center of the map where one flow line is intersecting a set of other flow lines in the same area. The intersection between the lines is because of one flow line which is incorrectly drawn at an oblique angle relative to the water table contours whereas the other set of lines are correctly drawn at right angles to the contours.