Lateral loads on timber pier

[5114]

I have to calculate the lateral loads along a timber pile and the contributing horizontal member due to wave loading.

Pile bent (two 12" piles 4' apart) spacing is 15', 3x12 horizontal member, water depth is 12', pile height is 18', 3x12 horizontal memeber is 3' down from top.

Looking for a quick method.

Thanks,

5114