"This data will be helpful because the City of San Antonio has passed a conservation ordinance that addresses new turf installation that is supposed to go into effect January 2007," Havlak said. "The ordinance will require new home construction to have at least 4 inches of topsoil before a lawn is established, and that's the amount we used in our plot testing. It will also require that during new home construction, landscapers plant grasses most likely to survive a 60-day drought. Of course, it's imperative that this is all based on good science." Wish this was an ordinance around here. People are laying sod over rocky, bottly, 2x4-y clay crap, just because that's the only way to win bids. Bobcat + topsoil costs too much, so the construction people are grading it themselves and just asking for the sod to be put down... Good for them in San Antonio.