Dam Renovation Project Update
Most members of the LLPOA are aware of the dam project
required by the NYS
Department of Conservation. Because of erosion on the back of
the dam, the DEC mandated that engineering and con- struction work
be done to verify the flow of water and potential property damage
in case of breaching; and rectify any existing structural defects.
The LLPOA hired a civil engineer to analyze the dam and its flood plain, and to prepare
a report to our Association and the DEC. In addition to this work,
our engineer will determine whether our dam can be reclassified to
a lower classification.
At this point, our dam is classified as a Class C,
which is considered a very large dam. Our dam is not a Class C dam,
and through our engineers analysis, this will be proven.
Our engineer completed most of the engineering
work. The report to the LLPOA was very encouraging. We evaluated
and defined Lake Lincolndales watershed. We determined the
Probable Maximum Flood (PMF), and has created an initial map of
the downstream flood plain. Through this initial model, we determined
that only one downstream structure may be damaged. Further examination
will determine the extent, if any, of this damage.
We also studied the historic design drawings of the
dam, detailing the metal sheet piling within the dam structure,
and the vertical control datum as related to the spillway. We also
examined the dam visually. By way of this thorough evaluation, we
have determined that the dam is structurally sound, and will not
breach. If there is to be failure of the dam in the future, it would
likely be due to overtopping, waters flowing over the
top of the dam, and down the back slope of the earthen side.
It should be noted, however, that we recently replaced
the dam valve. In the event of a catastrophic storm, the valve can
be opened, and water can be drained to prevent overtopping. Our
Lake Management Committee is in charge of making sure that the valve
is maintained on a yearly basis.
We will complete the modeling phase
in 2013. Once complete, the results will be summarized onto
maps and presented, along with the findings and conclusions of our engineer, to the LLPOA board for their consideration. A conclusion
regarding the hazard classification of the dam will also be presented.
The board will then disseminate the information about the status
of the dam.
Many members of the LLPOA, as well as non-members
who live in Lake Lincolndale, have contributed generously to the
Fund. The board would like to extend a hearty THANK YOU
to all of these individuals.