Aggregate groundwater use An Aggregate Groundwater Withdrawal/Return site represents an aggregate of specific sites where groundwater is withdrawn or returned which is defined by a geographic area or some other common characteristic. An aggregate groundwater site type is used when it is not possible or practical to describe the specific sites as springs or as any type of well including 'multiple wells', or when water-use information is only available for the aggregate. Aggregated Use Sites Adapted from USGS Site Types. https://help.waterdata.usgs.gov/code/site_tp_query?fmt=html ODM2 SiteType Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of a data collection Site. To some extent, these types represent the ultimate feature of interest that the site was established to measure. For example, a Stream Site was established to measure properties of a Stream.