9. The direction of ground water-flow can be determined with the help of: A. Depth of water level map B. Water table contour map C. Subsurface topographic map D. All of the above (ISM-2015)
Most probably the correct option would be (B).
As depth to water level map or isobath map, as these names imply, shows the spatial distribution of the depth of the water table bel...
General flow directions are determined from contour maps of the water table and potentiometric surface .if available, or from information on water levels, boundaries, and locations...