Word: substrata
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Dates: during 1960-1969
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...Technology has taken dramatic strides over the past two decades. Bridge designers are well-grounded in modern physics and aerodynamics before formulating their designs, then run them through computers that have already been fed data on snow and rain conditions, wind velocities, low and high temperatures, traffic loads and substrata strength...
...trouble comes partly from the artesian wells and methane gas taps that weaken the substrata on which the city is built. During storms the lagoon's water tears at the ancient buildings. Similar erosion is caused by the waves of the numerous motorboats, patronized by those too impatient to use gondolas...