Environmental Engineering Reference
In-Depth Information
Figure 8.10.
Blue Rock Dam (ANCOLD, 1990).
Figure 8.11.
Hinze Dam (ANCOLD, 1990).
8.3.2.5
Concrete face rockfill dams
Several examples of a concrete face rockfill dams (CFRD) are given in Chapter 15.
8.4
SELECTION OF EMBANKMENT TYPE
The selection of the type of dam embankment to be used at a particular site is affected by
many factors, some of which are outlined below. The dam engineer's task is to consider
these factors and adopt a suitable design. The overriding consideration in most cases will
be to construct an adequately safe structure for the lowest total cost. Hence, preparation
of alternative designs and estimates of cost for those alternatives will be a normal part of
the design procedure. Usually the most economic design will be that which uses a con-
struction materials source close to the dam, without excessive modification from the
“borrow pit run” or “quarry run” material.
The following outlines some of the factors involved and their effect on embankment type.
8.4.1
Availability of construction materials
8.4.1.1
Earthfill
Clearly the availability of suitable earthfill within economic haul distance is critical in the
selection of the embankment type. If there is no earthfill available - for example in an area
