Texas A&M reports that bermudagrass roots can grow to a depth of six feet or more depending on soil characteristics, however, the majority of the root system, 80% or more, is found in the top 6 inches of soil.

https://aggie-horticulture.tamu.edu/archives/parsons/turf/publications/Bermuda.html

Bermudagrass is a sod-forming perennial that spreads by stolons (above ground), rhizomes (under ground) and seed. It's a popular choice for lawns in the hotter regions because it does well in high temperatures, is resistant to wear and tear, and can be fairly drought tolerant under certain conditions.

It does become a challenge to eradicate if it is invading a bluegrass lawn, or if a homeowner wants to replace an existing bermudagrass lawn with another kind of turfgrass.

See this link for more information and for eradicating bermudagrass:

http://planttalk.colostate.edu/topics/lawns/1531-bermuda-grass-lawns-gardens/

Sorry, I omitted information on properly identifying bermudagrass. Here is a link that can assist you with proper identification:

http://turfid.ncsu.edu/csPagedPdField.aspx?PlantID=CYNDA

Thanks for the quick response and the links!

Bob Wolper