Burgess & Niple Engineer Dan Hill has recommended a solution to Grandview Heights City Council that he believes will ultimately allow the last portion of the city's flood plain designation to be removed.
At council's Aug. 4 meeting, Hill
said the best solution would be to install a flap-gate at the exit of the culvert at the railroad tracks.
Council asked Hill
-- a Grandview resident who originally informed city officials that FEMA's designation might be incorrect -- to investigate possible solutions for the rest of the city.
The remaining flood plain area has remained because when heavy rain hits, backwater flooding comes out through the culvert, Hill
The flap-gate is a large metal flap which would be hinged to the top of the culvert's headwall.
While it would allow water from normal rain to flow through the culvert, when backwater flooding is threatening, the gate would be pushed against the end of the culvert, blocking the backwater flood from going through the exit, Hill
The cost to construct the flap-gate would be an estimated $350,000, he
said.There would be other costs associated with the project.
Other solutions were not recommended because they would have put pressure on the culvert that it probably would have not been able to withstand without additional maintenance work.
"Those solutions would have placed an added cost to the project that the flap-gate wouldn't," Hill
said."We just felt it didn't make sense to have to add that cost to the process."
If council approves the flap-gate recommendation, the next step would be to seek FEMA's agreement that the option would result in the remaining flood plan designation being lifted, he
The entire process, including petitioning FEMA
and completing construction of the flap-gate, would likely take about two years, Hill
The city is still waiting for the release of the revised FEMA maps showing most of Grandview removed from the flood plain, he
"We were expecting that to be released by the summer," Hill
said."But it hasn't happened yet."
While there have been different factors involved in the delay, one indication is that a funding shortfall for FEMA
has delayed the completion of the map, he
"From what we've heard, it now looks like the map may be released in January," Hill
Property owners will not be able to have their flood insurance canceled until the map is released, he