Environmental Engineering Reference
In-Depth Information
Figure 20.8.
(e) Pore pressures. (f) Earth pressure (ICOLD, 1989).
ANCOLD (2003) recommend five levels of inspection which are detailed in
Table 20.13
.
For dams in sound condition with no deficiencies, ANCOLD (2003) recommend the
frequency of inspection shown in
Table 20.14
. More frequent inspections may be neces-
sary where a dam is known to have a deficiency, the authors would add that more fre-
quent inspections should be taken under historic high reservoir conditions.
The frequency of routine dam safety and routine visual inspections should be increased
during first filling. For example, for a high or extreme consequence of failure dam which
fills over a few months, there should be daily routine visual inspections, and say weekly
or fortnightly routine dam safety inspections by engineers familiar with the design of the
dam and its expected performance. The inspection should be carried out to a checklist. An
example of such a checklist is given in
Table 20.15
the checklist is for an earth dam, but
could be modified for other types of dams. Seepage measurement would normally be
included on the same report sheet. USBR (1983), FEMA (1987), and ANCOLD (2003)
have more detailed checklists.
