as a ps... here is a description from playak.com it shoudl give you an idea of the changes based on the levels of watervisible in the photo.
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This is a great series of tidal waves, especially in the summer when there is no water on the rivers. It consists of 12 arches in a railway embankment seperating the Broadmeadow river estuary from the sea. Depending on the tides the water either flows into or out of the estuary. When flowing into the estuary the water forms a series of green waves which are good for surfing but not particularly retentive. At very high tides watch out for good broken waves staight behind the main waves. Numbering the arches starting from one nearest Malahide, numbers 3 and 9 are generally the best, but these rapids are different everytime you go. It is only usually worth going when the tide height is above 4 metres. A tide above 4.4 provides some superb potential. Aim to be at the arches about two hours BEFORE high tide. The flow is best about an hour or two before high tide. There are no real dangers as the site is relatively safe. When the tide is going out, the arches are completely different. They then consist of small rock drops with some small stoppers. These are all pretty tame but be very careful as they are extremely rocky and there are a few bits of metal left from old wrecks, hence, capsizing here is unadvisable. The drops are best an hour or two before low tide but never have that much play potential.
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