Environmental Engineering Reference
In-Depth Information
8.4.7
Time for construction
The time available for construction may influence the selection of dam type, particularly
if considered in relation to other factors such as the climate, e.g. in a climate of well
defined wet and dry seasons it may be practicable to construct an earth and rockfill or
earthfill dam, but only over two dry seasons. A concrete face rockfill dam may be con-
structed in lesser time by continuing to place rockfill in the wet season.
Foundation treatment and zoning details may also be influenced by the time available
for construction. For example, if constructing a dam on a permeable soil foundation, cut-
off may be achieved by a cutoff wall at the upstream toe rather than a rolled earth cutoff
under the central core, so that the cutoff wall can be constructed at the same time as the
rest of the embankment.
