Thursday, May 31, 2007 | Permalink
In her amazing book Against the Tide: The Battle for America's Beaches, Cornelia Dean recounts all too briefly what Galvestonians did to their city after the devastating hurricane of 1900 which killed nearly 6,000 people and leveled what was then considered “the center of commerce for the entire Southwest” into a mountain of driftwood.
Rather than retreating from the shifting sands to points higher elsewhere, we read that the city instead decided to build a seawall, fencing itself off from future disasters. It then raised everything behind this wall — houses, churches, offices, trees, gardens — by as much as 17 feet, and flooded the revealed negative stratum with silt.
It was a “plan that even in an era of engineering daring stood out for its size, cost, and audacity.”
Quoting pages 6 and 8:
The lifting operation was one of sheer brawn. Laborers ran beams under the buildings and mounted them on screwjacks that burly men turned by hand. In this way, 2,156 buildings were laboriously hoisted, a quarter of an inch at a turn, until they reached the requisite height and new foundations could be built beneath them. Meanwhile, children climbed rickety catwalks to reach their schools; housewives hung their laundry from lines strung fifteen feet above the ground.
Even substantial structures took to the air. At St. Patrick's Church, a three-hundred ton brick structure, services continued as it rose to the grunts of laborers manning two hundred screwjacks beneath it.
To repeat: At St. Patrick's Church, a three-hundred ton brick structure, services continued as it rose to the grunts of laborers manning two hundred screwjacks beneath it!
Once airborne, a proto-Archigram city in quasi-flight, fill was delivered from a canal engineers had dug down the middle of the island.
Day and night, dredges moved back and forth between Galveston Harbor and this canal, dredging up fill from the harbor bottom and spewing it out on either side of the canal in a slurry of water and sand.
There were some residents who did not want to jack up their properties; these same people then witnessed their houses getting “drowned in the slurry of sand.”
The owners of several elegant Victorian mansions declined to subject them to the rigors of the screwjack. Instead they let the pumped sand fill their first reception rooms or turned them into basements. The lawn of one graceful brick house, once surrounded by a ten-foot wrought-iron fence, is now edged by ornamental ironwork about a foot high—the top of the fence is peeking up through the surface of the fill that now surrounds it.
So who wants to take a bet on when Galveston will get jacked up again?
Or for that matter, when will it be done to New Orleans, Dakha, Venice, New York, and every other major cities in the world threatened by sea-level rise?
The Army Corps of Engineers: The Game
Labels: disasters, littoral, megaprojects
Wikipedia article here
Post a Comment