It is dependent on the specific boat. The ways that water
can enter are through the companionway
, hatches, stovepipes, or through hull
discharges. Most of these are placed along the centerline and are made to seal tightly (not as true for some older wooden boats). Through hulls are a common source of flooding when the tide goes out and need to all have a way of shutting them including those above the water
line. More than 1 boat has sunk due to a bilge pump
line that discharges in the topsides becoming a siphon.
The hatches along the centerline and the companionway
will let some water in on older boats so it is important that they remain above the water. The major determining factor here is the volume distribution. A boat with greater beam and greater draft
will lay over further than a boat with less beam and less draft
. Perhaps this is the reason that the comment was made that S&S boats suffer from this problem since they tend to be narrow and deep.
I have seen two S&S boats aground and laying on their topsides and neither flooded when the tide came back in. They may well have designed a boat that would but it is not my experience. Also remember that the above discussion was for a relatively flat bottom, any boat will flood if the keel
is on top of a single
rock allowing it to lay over enough.
I would certainly not let the comment you heard deter you from an S&S boat, they are truly top notch safe designs. Everyone runs aground at some point but it is relatively rare for the boat to end up completely on its side. Where do you plan to sail? Many locations don't even have enough tide for this to matter.