Superstorm Sandy devastated NJ. Now, new flood walls to protect it.

A decade after they were first envisioned in the aftermath of Superstorm Sandy’s destruction, two of the largest flood control projects designed to protect the densely populated cities of New Jersey that lie just outside New York City will finally get underway Oct. 25.

A project in Hoboken, which was inundated by flooding during the 2012 storm, and another in the densely populated Meadowlands region, which also saw catastrophic flooding, will kick off. The projects will cost nearly $298 million and are designed to protect some of the region’s most vulnerable communities.

Both projects were formulated by the group Rebuild By Design, which was initiated by the U.S. Department of Housing and Urban Development in 2013, and New Jersey environmental officials. Rebuild By Design looked at ways to reduce flood risk and increase resiliency in New Jersey, New York, and Connecticut, and it launched a series of projects that are in various phases of planning or construction.

“What you’re seeing in New Jersey is that we can create projects that protect communities from damage and flooding, and do it in ways that enhance communities,” said Amy Chester, Rebuild By Design’s managing director.

RBD Hudson River is by far the larger of the two, costing $215 million. It calls for building about 1.7 miles of flood walls, installation of flood gates, and construction of berms and levees. Most of the work will be done in Hoboken, but parts will extend to protect areas of Jersey City and Weehawken, which also sit along the Hudson Riverfront across from Manhattan.

The RBD Meadowlands project will add a high-power pumping station capable of moving 50 cubic feet of water per second in Little Ferry, a flood-prone community along the Hackensack River that has been designated as a “community disaster resiliency” area, eligible for additional protection funding.

It also will add another new pumping station capable of moving 10 times that much water on a waterway in Carlstadt and Moonachie. Channel improvements also will be made there.

Sandy hit the nation’s most populous metro area on Oct. 29, 2012. It swamped coastline communities, knocking out power, flooding transit systems, and setting neighborhoods ablaze. It’s blamed for 182 deaths, including 12 in New Jersey and 48 in New York, and caused tens of billions of dollars worth of damage, including $36.8 billion in New Jersey and $32.8 billion in New York.

Ms. Chester cited numerous projects already completed in Hoboken as part of the post-Sandy flood-proofing efforts. They include planting more grass, trees, and vegetation in urban areas to absorb rainfall and allow less runoff to flood streets and storm sewers.

Hoboken has already built three so-called “resiliency parks” in which green space is designed to absorb water, while runoff is collected in underground storage tanks and slowly released after a storm has passed.

Ms. Chester said that recent heavy rains that caused massive flooding in New York City did not cause similar chaos in Hoboken, due in part to the resiliency work.

And as big as they are, the two projects starting Wednesday pale in comparison to huge flood control efforts being contemplated by the federal government. They include a $52 billion plan to build movable barriers and gates across bays, rivers, and other waterways in New York and New Jersey, and a $16 billion plan to address back-bay flooding in New Jersey by building movable storm gates at inlets and across bays. There’s also discussion of elevating 19,000 buildings near waterways in many parts of the state.

This story was reported by The Associated Press.