Westchester County Executive Rob Astorino has submitted legislation to the Board of Legislators for two projects to reduce flooding at sites in Eastchester, Harrison, Mamaroneck and Yonkers by expanding capacity for storing and absorbing floodwaters, as well as improving water quality and enhancing visual appearance. The cost of the work would total $1.85 million.
One site is in Saxon Woods Park, located in parts of Mamaroneck and Harrison, 9 acres of floodplain along 1,400 feet of the Mamaroneck River will be restored at a cost of $600,000. The severely eroded riverbank will be stabilized with rock revetment supplemented by vegetation. Invasive vines will be replaced with tree saplings and other vegetation to stabilize the soil and improve water absorption and filtration. In 2012, the county made similar improvements to 9 acres along 1,600 feet of the river directly to the north.
In Eastchester and Yonkers, south of the Harney Road Bridge in the county’s Bronx River Parkway Reservation, the county will stabilize 750 feet along both sides of the Bronx River at a cost of $1.25 million. Severe erosion and sedimentation are aggravating flooding conditions and threatening the park pathway. The county will relocate river sediment to widen the river channel, and the riverbank will be re-graded. Stone structures within the channel will redirect water flow to lessen the threat of bank erosion and sedimentation.
“These projects are part of a larger and ongoing effort to address the impacts of flooding in the county,” Astorino said in a statement. “Last year we completed the rehabilitation of the Oak Street Pump Station in Yonkers that was damaged by Superstorm Sandy. The County Center is now buffered from the impacts of flooding thanks to stormwater management projects along the banks of the Bronx River.”
Under construction next to Fisher Lane and the Bronx River Parkway in Greenburgh is the restoration of a stormwater and flood management wetland next to the Bronx River. The $850,000 project is scheduled to be completed by summer.
Flood mitigation projects completed in recent years include:
— Restoring and stabilizing 1,000 feet of the west bank and 1,200 feet of the east bank of the Bronx River between the Bronx River Parkway and the County Center parking lot in 2011 and 2012.
— Constructing stormwater management and in-channel stone diversion structures and restoring the river buffer at Scout Field in Mount Vernon in 2013.
— Rye city last year completed retrofitting of the Blind Brook Dam at Bowman Avenue in Rye Brook. The city is eligible for up to a 50 percent cost match or a maximum of $1.08 million from the county.
Other flood mitigation projects moving forward include:
— Replacing the Anita Lane Bridge in Mamaroneck to improve the flow in the river channel during severe storms, $1.5 million.
— Redirecting the river channel away from the supporting wall of the Bronx River Parkway at Garth Woods, $2 million.
— Stabilizing embankment and implementing stormwater management practices along Fulton Brook in the Bronx River Reservation near the County Center, $600,000.
(View of Bronx River and parkway southbound from Harney Road Bridge/contributed photo.)