Depending on the version the character chose, the control
water spell raises or lowers water.
Lower Water: This causes water (or similar liquid) to sink
away to a minimum depth of 1 inch. The depth can be lowered by up
to 2 feet per caster level. The water is lowered within a
squarish depression whose sides are up to 10 feet long per caster
level. In extremely large and deep bodies of water, such as deep
ocean, the spell creates a whirlpool that sweeps ships and
similar craft downward, putting them at risk and rendering them
unable to leave by normal movement for the duration of the spell.
When cast on water elementals and other water-based creatures,
this spell acts as a slow spell. The spell has no effect on other
Raise Water: This causes water (or similar liquid) to rise in
height, just as the lower water version causes it to lower. Boats
raised in this way slide down the sides of the hump that the
spell creates. If the area affected by the spell includes
riverbanks, a beach, or other land near the raised water, the
water can spill over onto dry land.
For either version, the character may reduce one horizontal
dimension by half and double the other horizontal dimension.