Three piezometers located 1000 m apart bottom in the same horizontal aquifer. Piezometer A is due south of piezometer B, and piezometer C is to the east of the line AB. The surface elevations of A, B, and C are 95 m, 110 m, and 135 m respectively. The depth of water in A is 5 m, in B is 30 m, and in C is 35 m. Determine the direction of groundwater flow through the triangle ABC and calculate the hydraulic gradient.