This document summarizes a presentation about the evolution of groundwater management districts (GCDs) and groundwater ownership in Texas. It discusses how GCDs were established to regulate groundwater use after the rule of capture. It provides details on the functions and organization of GCDs, the joint planning process between GCDs and other agencies, and important court cases that shaped groundwater rights. It concludes with an analysis of the EAA v. Day ruling that landowners have a constitutionally protected interest in the groundwater beneath their property.