FISA Height of Swivel Rowing Diagram[/caption]

Hello, I am seeking information for the recommended height of the swivel above water level?

Great question – here’s what we found as an answer from this FISA Intermediate Rigging ebook 

On page 4 it says

The actual depth of immersion may vary if the actual crew weight does not correspond to the designed crew weight (generally, 1 mm for each 10 kg difference). Any alteration in the depth of immersion will bring with it an alteration in the height of the freeboard and swivel above the water surface. This may affect the position of the pull on the oar handle and reduce the effectiveness of the drive. To ensure that the drive is at the proper level, it is recommended that the height of the swivel above the water be 24 cm in sweep rowing boats and 22 cm in sculling boats (see figure 1).

There is also a good discussion thread on Rec Sport Rowing which may give you more insight

Hope this helps!