Answer: reservoirs

AnswerCrossword Clue
RESERVOIRSStockpiles
reservoirsA receptacle or part of a machine designed to hold fluid
reservoirsA place where fluid collects, esp. in rock strata or in the body
reservoirsA large natural or artificial lake used as a source of water supply
reservoirsA population, tissue, etc., that is chronically infested with the causative agent of a disease and can act as a source of further infection
reservoirsA supply or source of something