Hydraulic Structures: Fourth Edition

The relative disadvantages of the embankment dam are few. The most important include an inherently greater susceptibility to dam ...

the major portion of the water load to the abutments or valley sides rather than to the floor of the valley. A relatively simple ...

Other concrete dams.A number of less common variants of the major types of concrete dams illustrated in Fig. 1.4 can also be id ...

As a corollary to 2, all concrete dams can accommodate a crest spill- way, if necessary over their entire length, provided that ...

A considered evaluation of the generalized characteristics in con- junction with Figs 1.3 and 1.4 will suggest further conclusio ...

Spillways are normally uncontrolled, i.e. they function automatically as the water level rises above NWL, but they may be contro ...

1.5.4 Cut-offs Seepage under and round the flank of a dam must be controlled. This is achieved by the construction of a cut-off ...

1.6 Site assessment and selection of type of dam 1.6.1 General site appraisal A satisfactory site for a reservoir must fulfil ce ...

of estimated costs and construction programmes. Within the latter, account must be taken of the resource implications of each, i ...

associated problems is addressed in ICOLD (1970) and in Fell, Mac- Gregor and Stapledon (1992). As specific examples, investigat ...

In parallel with these investigations, extensive and detailed surveys are required to establish the location and extent of poten ...

General features to be identified and defined in the course of the site investigation include the interface between soil and roc ...

geological structures it is possible to make a probabilistic assessment of seismic risk in terms of specific intensities of seis ...

The soft consistency of the clays may necessitate the use of special sampling techniques. In such situations continuous sampling ...

EMBANKMENT DAMS Foundation seepage is less critical than for the concrete dam, as seepage paths are much longer. Discontinuity s ...

1.6.5 Materials for dam construction Initial exploration for sources of materials is conducted by a combination of surface and a ...

it is important that options are kept open, assessing the implications of each with respect to resources, programme and cost, un ...

collective importance is such, however, that Fig. 1.7 and Table 1.7 are pro- vided in illustration. Selection of type of dam is ...

The situation shown in Fig. 1.7(d), with deep overburden under one- half of the site, could well suggest the composite solution ...

material processing and transportation costs, availability of plant and trained labour, ease of river diversion, risk of flood i ...