Castle U.S. Army Corps of Engineers
Institute for Water Resources
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Data quality and site quality are based on a scale of 1-7 with 1 being the highest quality and 7 the lowest.

Data Type Definitions:

descriptive means the Webpage contains data in reports formats, such as case histories, laws, regulations, etc.
spatial means the Webpage contains data which is dependant or grouped by regions, states, watersheds, etc.
statistical means the Webpage contains data which is statistical in format
temporal means the Webpage contains information which is time dependant or regularly updated