Hydraulic Structures: Fourth Edition

same as the effect of pile 2 on pile 1. However, this correction is subtrac-
tive and 3.03%.

INFLUENCE OF PILE 3 ON PC/H (SEE FIG. 9.15)

NowD(measured from the top level of pile 2)99.25 91.008.25 m.
Also,d99.25 93.006.25 m.

The correction, C 198

 .2 

5

 /3 

4

 (8.256.25)/50.52.69%.

Correction for sloping floor for PC/H

The slope being
the theoretical correction is around 3.3% (see Section
9.1.5 a (iii)) and the corrected slope with the horizontal length of the
sloping floor, b 2 (100.50 99.25) being 5 m

3.3 (5/34)0.48%.

The corrected pressure behind (E) the pile 2 is

PE/H69.00 0.54 3.0365.43≈65%

and ahead (C) of the pile,

PC/H53.001.182.69 0.4856.39≈56%.

(C) DOWNSTREAM END PILING – PILE 3 (SEE FIG. 9.15)

Theoretical pile depth, d98.50 91.007.50 m

1/
d/b7.5/50.500.148 and

PE/H(directly from pressure chart – see Fig. 9.5)36%.

Similarly,PD/H26%.

CORRECTION FOR FLOOR THICKNESS, t (98.50 97.25)1.25 m

(36 26)1.25/7.51.67%.

Correction for interference of pile 2 on pile 3 (see Fig. 9.15)

Depth of pile 2, D97.25 93.004.25 m
Depth of pile 3, d97.25 91.006.25 m.

The correction, C 194

 .2 

5

 /3 

4

 (4.256.25)/50.500.073%.

WEIRS AND BARRAGES 391