Environmental Engineering Reference
In-Depth Information
Table 15.13.
Data on leakage rates observed in early CFRD during first-filling and during operation.
First Filling
During Operation
Water
Max
Max
depth at
leakage
Water
leakage
Water
Comments
Dam
Height
full supply
rate
depth
rate
depth
Long-term
on leakage
name
(m)
level (m)
(l/s)
(m)
(l/s)
(m)
rate (l/s)
trends
Comments
Cogswell
85.5
Unknown
3510
63.5
Unknown
Unknown
Unknown
Significant
Construction involved
leakage on first
dry dumped angular
filling due to
rockfill with later
face slab cracking
sluicing. Remedial
as a result of large
works included
embankment
placement of timber
settlements.
facing over face slab.
Courtright
96.5
94
Unknown
Unknown
1275
94
Unknown
Progressive
Construction involved
increase in leakage
dumping and high
rate measured over
pressure sluicing of
9 yrs after EOC.
angular rockfill.
Significant remedial
works implemented to
reduce leakage.
Leakage related to face
slab cracking and
opening of perimetric
joints.
Dix River
84
76
Unknown
Unknown
2700
Unknown
2000
Max leakage
Construction involved
(12 yrs
related to slab
dumping of rockfill
after EOC)
joints and
with sluicing of limited
perimetric joints.
effect. Long-term rate
measured 30 years
after end of
construction.
Lower Bear
75
71.5
110
71.5
85
71.5
25-40
Fluctuations in
Construction involved
No. 1
leakage rate
dumping and high
closely related to
pressure sluicing of
(Continued)
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