Here, you can see how widespread the water intrusion really is in this crawlspace. Here's what a Healthy Spaces expert would recommend:
1. Reducing relative humidity in the crawlspace by dehumidifying the crawlspace air. This can be accomplished with a Sanidry dehumdifier, crawlspace encapsulation using a dimple roll and 6 mil poly or Cleanspace product, and vent covers.
2. Preventing groundwater intrusion. This is essential to stopping crawlspace moisture. The best way to accomplish this is through crawlspace encapsulation or lining the crawlspace with vapor barrier.
3. Closing off the crawlspace from outside air. Vents in crawlspaces start a terrible moisture cycle and should closed off to allow the dehumidifier to work properly. It will also increase your indoor air quality because you can condition this air and filter it so mold spores don't make your family sick.