Systems and methods for collecting, storing, and redistributing water, which systems and methods make use of building foundations and surface concrete slab structures. A variety of rainwater collectors are anticipated, including rooftop collection systems (e.g., gutters) and ground surface covering structures (driveways, sidewalks, parking lots, and patios). These collection systems are joined together in a collection conduit system that carries the rainwater to one or more rainwater containment vessels. The stored water may then be redistributed, again through a variety of distribution means, to address part or all of the landscape watering requirements of the property. The system takes advantage of standard foundation and slab construction techniques to establish a major portion of the structure required for the containment vessel.