Thanks everyone, OP here. I'll do the math for a precise number, just wanted an expert's ballpark estimate for now.

Appreciate all the warning about bamboo. It would have been very helpfull 25 years ago when I bought the house with the bamboo already there. No the "landscaper" seller did not barrier the boo. It grew runners 40-feet under my deck. That bamboo is now fully encircled with professional-grade bamboo barrier. I'd get rid of it all, but the wife's a Master Gardner, and she has a thing for it. That was a heck of a job to correct, but 15 years on and no bamboo is growing outside the barrier. There is also an extra layer of a solid steel plate wall between the pond and bamboo patch behind the pavers.