FOR IMMEDIATE RELEASE05-44
October
25, 2005
Contact:
Charles G. Sturcken
(718) 595-6600
Public
Advisory Concerning Schoharie Reservoir
The New York City Department of Environmental Protection has a
long standing commitment to upgrading its dams to modern design
criteria. We have initiated a comprehensive program over the past
few years to assess the condition of dams at City-owned reservoirs
in the Catskill/Delaware watershed and to undertake repairs and
rehabilitation required by our investigations. (This is similar
to a program initiated by DEP in the mid-1980s to assess and rehabilitate
City-owned dams located in the east of Hudson watershed.)
As part of its system-wide dam rehabilitation program, DEP has
been conducting field investigations at the Gilboa Dam at the Schoharie
Reservoir. A full rehabilitation of the Dam is slated to begin
in 2010. While DEP consultants believe that Gilboa Dam continues
to be safe under normal operating conditions our recent investigations
reveal that safety factors associated with modern engineering practices
are not met by the Dam in its present state. The assumptions made
in the original design and construction of the dam are outmoded
and do not apply to dams as built today.
To that end, DEP will expedite interim structural reinforcement
of the Gilboa Dam and perform associated work prior to the start
of the complete rehabilitation project. Measures undertaken are
expected to include the placement of inclined reinforcing anchors
that extend into the native bedrock at the toe of the existing
Dam structure. This work will be performed when reservoir spillage
and weather conditions permit safe access for workers and equipment
on the face of the Dam and spillway channel in late spring 2006.
Until the expedited work is completed, DEP will closely monitor
the condition of the Dam. DEP has been in contact with dam safety
officials from the New York State Department of Environmental Conservation
and has contacted emergency management and law enforcement officials
in the counties and towns downstream of the Dam.
Construction of the Gilboa Dam was started in 1920 and completed
in 1927 The Gilboa Dam impounds the Schoharie Creek, which flows
northerly to the Mohawk River. The Dam is comprised of an earthen
embankment and concrete spillway. The Reservoir has a capacity
of 19.5 billion gallons and on average provides approximately 16%
of New York City’s water supply.