Three piezometers A, B, C are 2000 m apart from each other. Piezometer B is located due north of Piezometer A, and C to the west of line AB. The ground surface elevation, the bottom elevation, and depth of water in each piezometer is given below: At A At B At C
Ground elevation (above mean sea level) (m) 340 300 360
Piezometer bottom elevation (m) 100 90 110
Depth to water level in piezometer from ground surface (m) 50 30 80

Required:
Estimate the direction of the groundwater flow that is perpendicular to the contours.