3(15 pts.): the image below shows a cross section through an earthen dam sitting atop an impermeable bedrock surface. do the following: a) for each lettered point, estimate the elevation, pressure, and total head. explain your reasoning (briefly). see the notes below. b) suppose you hire budget consulting to install a piezometer somewhere below the top surface of the dam. using the flat bedrock surface as a datum, budget reports-with confidence-a total hydraulic head of 1 m in their piezometer. what's wrong with this? did you get what you paid for? notes: points b and e are 'half way up' the (submerged) reservoir and tail-water faces, respectively. the elevation of point c is about 0.5 m below the reservoir surface. the elevation of point d is about 0.5 m above the tail water surface. point f is near the 'middle' of the dam. reservoir seepage face 4 m "tail- ,e water" 45° 2 m 450 impermeable base (k=0)