The question of "Perigean Spring Tides" has been one that our office has been required to answer on numerous occasions over the years.
The whole issue of coastal flooding during the "perigean spring tides" stems from a misunderstanding of the information presented in a book by Fergus J. The moon is the primary source of the gravitational forces which cause the tides.
[Example (jpg)] The exact relationship between the times of high and low tides and the maximum current or slack water is unique to each location and cannot be determined from a generic "rule of thumb".
Because the tidal currents are created by the same forces which cause the tides, the currents can be predicted in much the same way as the tides.
"Tide Charts" are only available for a few locations around the USA.