Profile of a weir on permeable foundation is shown in figure I and an elementary profile of upstream pile only case' according to Khosla's theory is shown in figure II. The uplift pressure heads at key points Q, R and S are 3.14 m, 2.75 m and 0 m, respectively (refer figure II).What is the uplift pressure head at point P downstream of the weir (junction of floor and pile as shown in the figure I)?

Profile of a weir on permeable foundation is shown in figure I and an

1.	Profile of a weir on permeable foundation is shown in figure I and an elementary profile of upstream pile only case' according to Khosla's theory is shown in figure II. The uplift pressure heads at key points Q, R and S are 3.14 m, 2.75 m and 0 m, respectively (refer figure II).What is the uplift pressure head at point P downstream of the weir (junction of floor and pile as shown in the figure I)?
A.	2.75 m
B.	1.25 m
C.	0.8 m
D.	Data not sufficient
Answer» C. 0.8 m