The Post Oak Savannah Groundwater Conservation District (POSGCD) and Burleson County AgriLife Extension are hosting a free rainwater harvesting 101 class on Thursday, Sept. 18, from 10-11:30 a.m. at the Burleson County AgriLife Extension Office at 1516 F.M. 166 in Caldwell.The class will teach participants how to set up a rainwater collection system, store water safely and use it around ...