On Monday, April 25, 2016 at 11:32:03 AM UTC-4, wrote:
On 4/25/2016 10:42 AM, DerbyDad03 wrote:
Raised edges will allow dirt and other debris to get caught. Even the
smallest pile of dirt can catch weed seeds and allow them to grow.
In the crawl space under the house with no light?

btw, (IMHO) a poured in place rat slab/mud mat will cause the same drainage problems, if not more, than a simple poly vapor barrier...a sump pit/pump would make sense for for a poured in place slab as well...
Just curious, where is the flood water coming in? From above or below the crawl space floor?