Like many other cities, Norfolk was built on filled-in marsh. Now that fill is settling and compacting. In addition, the city is in an area where significant natural sinking of land is occurring. The result is that Norfolk has experienced the highest relative increase in sea level on the East Coast  14.5 inches since 1930, according to readings by the Sewells Point naval station here.

Climate change is a subject of friction in Virginia. The state’s attorney general, Ken T. Cuccinelli II, is trying to prove that a prominent climate scientist engaged in fraud when he was a researcher at the University of Virginia. But the residents of coastal neighborhoods here are less interested in the debate than in the real-time consequences of a rise in sea level.

When Ms. Peck, now 75 and a caretaker to her husband, moved here 40 years ago, tidal flooding was an occasional hazard.

“Last month,” she said recently, “there were eight or nine days the tide was so doggone high it was difficult to drive.”

Larchmont residents have relentlessly lobbied the city to address the problem, and last summer it broke ground on a project to raise the street around the “u” by 18 inches and to readjust the angle of the storm drains so that when the river rises, the water does not back up into the street. The city will also turn a park at the edge of the river back into wetlands  it is now too saline for lawn grass to grow anyway. The cost for the work on this one short stretch is $1.25 million.