It suggests that more sediment could wash through the dam in coming years, since sustained downpours lead to high river flows and require more crest gate
This latest renovation significantly lowers the 100-year floodplain zone by adding an adjustable Obermeyer Crest Gate
for flow control of the Nashua River.
Zoppo Corp of Stoughton, the manufacturer of the crest gate
was Steel-Fab of Fitchburg and Sorenson of Northboro built the internal controls.
Hirakud dam presently has 64 sluice gate and 34 crest gate
for releasing flood water.
"The water was released as per the set procedures only after the reservoirs were full and the crest gates
were opened as per the standard operating procedure," he added.
Meanwhile with heavy inflows continuing into the Srisailam project across river Krishna in Kurnool district, authorities have opened the crest gates
of the dam to discharge more than 100,000 cusecs of water to the downstream Nagarjuna Sagar project.
To help reduce the flood risk in the northern part of the Fox River system, the large hinged crest gates
are operating wide open at the Stratton Lock and Dam in McHenry and at the Algonquin Dam, IDNR officials said.
The Andhra government moved the Supreme Court in April 2007, which directed that Maharashtra could go ahead with the project's construction, but it should not erect the crest gates
till the issue was settled.