Crawlspace Storage
Many folks use their crawlspaces as additional storage - which can be trouble when they take on water, moisture or constantly changing temperatures.
Water Staining
Here we see evidence of staining on the walls and floor. White mineral staining, efflorescence, is the evidence of moisture since evaporated on porous materials like block foundations.
Existing Sump and Drain
These methods of waterproofing were not able to keep up with the issues this homeowner was experiencing.
Protected Utilities
This crawlspace also contained utilities for the home - for sure, they want to protect these devices and mechanicals. Otherwise it could be costly to repair due to water and moisture damage.