Example $11\mathrm{.}7$: The loading period for a building extended from Feb., $1957$ to Feb., $1959.$ In

Feb., $1962,$ the average measured settlement was found to be $117$ mm $.$ The ultimate settle$-$

ment was expected to be $360$ mm $.$ Estimate the settlement in Feb., $1967,$ assuming double

drainage to occur. What would be this result if the measured settlement in Feb., $1962$ was $153$

mm instead of $117mm?$