$(10\%)$ What weight concrete tribars are needed as armor units for a breakwater $($crosssection similar to Figure $7\mathrm{.}4,$ Sorensen, $1997)$ if no damage is allowed and minor wave overtopping is assumed? The design water depth at the seaward toe of the breakwater is $6m$ and the sea floor in front of the breakwater has a $1$:$20$ slope. A design wave with $Hs=4\mathrm{.}9m$ and $Ts=8s$ in deep water $($ assume $Kr=1\mathrm{.}0)$ is to be used.