b$)$ The masonry dam whose cross section is shown, retains water against its vertical face.

i$.$ On a sketch, indicate all the forces $($at respective positions$)$ acting on the wall.

$(4$ Marks$)$

ii$.$ Determine the magnitude of each force. $(5$ Marks$)$

iii. Will tension develop any where in the base? $(6$ Marks$)$

FIG. Q$3($b$)$