The base of a dam for a kike is designed to resist up to 120 percent of the horizontal for...

The base of a dam for a kike is designed to resist up to 120 percent of the horizontal force of the water. After construction, it is found that silt that is equivalent to a liquid of density ρs= 1 .76 X 103 kg/m3) is settling on the lake bottom at the rate of 12  mm/year. Considering a 1-m-wide section of dam. determine the number of years until the dam becomes unsafe.

Fig. P5.87