Symbol 3854 from ISO 7000 - Title/Meaning: Flooding Function/description: To indicate the location where flooding is occurring or has occurred.
Additional information: 
The colour of water drops may be blue for more intuitive recognition.
Own work using: iso.org/obp/graphics/grs/2c053ae0-de2d-42d3-8213-4647722d20a5 200.png
Vectorization:  Mrmw