A temporary cofferdam is slated to be built to protect the 10-year construction activity for a major cross-valley hydropower project. If the cofferdam is designed to withstand the 30-year flooding event, compute the risk that the cofferdam will be overtopped during construction activity of the major cross-valley hydropower project (i) in the first year, (ii) in the third year exactly, (iii) at least once in 10-year of the construction period, and (iv) not at all during the 10-year construction period