Hydraulic Structures: Fourth Edition

9.1.6 Barrage width and scour depth (a) Barrage width The barrage width must be sufficient to pass the design flood safely. The ...

Fig. 9.9 Inverted filter and flexible (launching) apron (c) Concrete aprons and inverted filter The aprons are of plain concrete ...

Fig. 9.10 Cross-section through a barrage showing details of the foundations; all dimensions in metres ...

The limits of applicability of equation (9.13) are h 6 q1/3 (m) (equation (5.6) should be referred to, i.e. the overfalling jet ...

Worked Example 9.1 This example considers the design of a glacis-type weir. The following data are used: maximum flood discharge ...

H(1800/1.7169.55)2/33.39 m. Hence the RL of weir crest300.08 3.39296.69 m AOD. Since the allowable afflux is 1 m, downstrea ...

The exit gradient, Ge1/6Hs/πd 2 1/2(equation (9.8)), which gives (66/(π6))^2 3.65 and, from  1 2 [1(1
^2 )1/2],
( ...

Providing an upstream glacis of 2 in 1, 5 m of horizontal apron (safety factor for additional creep length), a downstream glacis ...

DESIGN OF APRONS For the downstream concrete block apron with open joints filled with spawls, length1.5d 2 9m. Use cast in sit ...

It should be permeable (to relieve uplift pressures), i.e. ∆Hn/Dn∆Hn 1 /Dn 1 ∆Hn 2 /Dn 2 ... where∆Hnis the head loss o ...

Fig. 9.12 Example of sieve curves for intermediate layers ...

The following filter layer thickness must be regarded as minimum requirements (for fair grain-size distribution throughout the l ...

The pond level299.00 m AOD and the regulator’s crest level297.50 m AOD. Therefore the head causing flow, H1.50 m (neglecting ...

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%, i ...

CORRECTION FOR THE MUTUAL INTERFERENCE OF PILES (SEE FIG. 9.15) Interference of pile 2 on pile 1 True depths of the piles: Dd9 ...

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 ...

Note:If the intermediate pile (pile 2, D) is shallower than the end pile (pile 3, d), i.e. Dd and b 1 ' 2 d (12.50 m) the mutu ...

the raised inlet sill to prevent entry of the bedload of the river; the skimmer wall (with splitter pier) at the inlet to trap ...

The desilting canal with its flushing sluices may be omitted if the sedi- ment load which would settle in the settling basin is ...

Fig. 9.17 Intake layouts with induced curvature to flow (after Mosonyi, 1987) Fig. 9.18 Use of artificial groyne (e.g. island) t ...