The areas we are considering are truly lateral water hazards based on the USGA definition. Not all areas will be designated as such because they are in blind areas from the hitting location (tee area). So the new rule "virtually certain" can't apply. From the USGA rules:
26-1
. Relief for Ball in Water Hazard
It is a question of fact whether a ball that has not been found after having been struck toward a
water hazard
is in the
hazard
. In the absence of knowledge or virtual certainty that a ball struck toward a
water hazard
, but not found, is in the
hazard
, the player must proceed under Rule
27-1
.
To answer another post: water does not have to visible or even present to be considered part of a lateral water hazard. From the USGA rules definitions:
Water Hazard
A “
water hazard
’’ is any sea, lake, pond, river, ditch, surface drainage ditch or other open water course (whether or not containing water) and anything of a similar nature on the
course
. All ground and water within the margin of a
water hazard
are part of the
water hazard
.
When the margin of a
water hazard
is defined by stakes, the stakes are inside the
water hazard
, and the margin of the
hazard
is defined by the nearest outside points of the stakes at ground level. When both stakes and lines are used to indicate a
water hazard
, the stakes identify the
hazard
and the lines define the
hazard
margin. When the margin of a
water hazard
is defined by a line on the ground, the line itself is in the
water hazard
. The margin of a
water hazard
extends vertically upwards and downwards.
A ball is in a
water hazard
when it lies in or any part of it touches the
water hazard
.
Stakes used to define the margin of or identify a
water hazard
are
obstructions
.