The Guri Hydroelectric Project of the Corporation Venezolana de
Guayana (CVG) is located on the Caroni River in northeastern Venezuela.
The project includes a water impoundment created by a concrete gravity type
dam. The dam contains a three-chute concrete spillway, each chute consisting
of an overflow gated crest, a steep chute, and a terminal flip
bucket. The spillway flow is projected from the bucket in a high arching
jet which plunges into the tailwater pool for final dissipation of its
Spillway flows were first released from the new structure early in
1969. Inspection of the spillway late in 1969 disclosed significant scouring
or erosion of portions of the lips of the buckets and the ends of the side
training walls. The Harza Engineering Company, which designed the structure
and provided engineering assistance during the construction and initial operations,
recommended to CVG that the damaged areas be restored with epoxy
concrete and epoxy protective coatings. These repairs were made early in
1970 before the new seasonal water release. Subsequent inspections late
in 1970 established that scouring had been renewed and even greater damage
had been sustained than in the previous year. Field inspection suggested
that the damage was due to the action of cavitation and that the damage might
not be self-arresting and was thus potentially hazardous.
Early in 1971 staff members of the Harza Engineering Company reviewed
the available evidence with staff members of the St. Anthony Falls Hydraulic
Laboratory of the University of Minnesota. As a consequence of these discussions
the Laboratory was authorized in February 1971 to proceed with an
experimental study. The objective of this study was to establish the mechanism
of the damage and the modifications of the existing design or operations
which would prevent and alleviate future damage.
This report describes and summarizes the findings of the study.
Harza Engineering Company; Corporacion Venezolana de Guyana
Ripken, John; Dahlin, Warren.
Hydraulic Model Studies for the Gury Hydroelectric Project Report on Spillway Cavitation Damage.
St. Anthony Falls Hydraulic Laboratory.
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