"drenched by" is a correct and usable phrase in written English.
It is used to describe something that is covered in, or completely soaked by, a liquid. For example, "The field was drenched by a sudden rainstorm."
FINANCIAL firms have already been drenched by mortgage-related losses.
Twenty-nine paragraphs later, Elfride reappears, drenched by rain.
Roux suggested that it had been drenched by tears.
As it happened, the Berkshires were being drenched by Irene, though Ducasse didn't know it.
Drenched by sunlight on her sofa, there is no sense of decline about Rendell today.
In "Shower" she is an Aphrodite, drenched by the waters of life and psychic fluidity.
He was drenched by the rain but he managed a thin smile as the buses arrived.
After their long, exhausting shifts in thin uniforms, often drenched by the rain, the prisoners returned to the main camp.
The crowds, drenched by the rain, gave Mrs. Merkel polite applause, even though it was her constituency.
But Ms. Aeya did not want to carry the 30 or so outfits drenched by Hurricane Sandy all the way to India.
Then they informed the press where he would be, and pictures of a Nobel laureate drenched by water cannons flashed around the world.
