Docks and Harbor Engineering
If H is the height of the wave expected, then the height of the breakwater is generally taken as

1.2 H to 1.25 H above the datum
1.2 H to 1.25 H above the low water level
1.2 H to 1.25 H above the mean sea level
1.2 H to 1.25 H above the high water level

ANSWER DOWNLOAD EXAMIANS APP