the.com/seawall

a concrete bet that the ocean will respect your property line.

means A barrier built along a shoreline to hold back the sea and protect the land behind it from waves and erosion.

from A plain English compound of "sea" and "wall," both ancient Germanic words — "sea" from Old English sǣ, "wall" from weall, the latter borrowed early from Latin vallum, the rampart of stakes a Roman legion threw up around its camp. So buried in the word is the old idea of a defensive fortification — except here the enemy at the gate is the tide.

sea level
rising faster than most seawalls were designed for
side effect
protects one beach by starving the next
ancient version
Caesarea's Roman harbor used self-setting volcanic concrete
erosion irony
reflected waves scour sand from the wall's base
netherlands
a third of the nation sits behind such walls
for instance

singapore's east coast seawall — 8.5 km barrier protecting singapore's densest residential area from storm surge and rising seas

rotterdam's maeslant barrier — massive movable storm surge barrier in netherlands, completed 1997, protects rotterdam from north sea flooding

thames barrier london — 10 steel gates across thames completed 1984, prevents north sea storm surge flooding into london

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