Hydraulic Structures: Fourth Edition

Theoreticald(from the floor level)100.00 93.007m

Total floor length, b50.5 m


1/
d/b7/50.50.139.

From Fig. 9.6 PD/H23%, if the piling had been located at the
downstream end of the floor. Since the piling 1 under question is located at
the upstream end, the law of reversibility gives

PD1/H 10023 77% (see Fig. 9.15)

Similarly from the chart we can get PE/H(at 1/
0.139)33% and hence
(point E of the downstream pile corresponds to C 1 of the pile at upstream
end) by the law of reversibility,

PC1/H 10033 67%.

Correction for floor thickness

Total pressure drop on the d/sface of the piling 7767 10% over a
height of 7 m; since the floor is 0.75 m thick (100 99.25) the correspond-
ing correction

(10/7)0.751.07% ().

WEIRS AND BARRAGES 389

106.00

102.25

1:4

100.00

100.50 1:5

C 1 99.25

(^1) b 15.75 2
b 1  15
b 34.75
b 1  34
D (^1) 93.00 93.00
b 50.5
91.00
3
97.25
98.50
Fig. 9.15 Weir foundation design (worked example 9.2) (all dimensions
in m)