In Reply Refer To:
Mail Stop 412

June 26, 2007

Office of Water Quality Technical Memorandum 2007.04

Subject: Controlling Flow of Water-Quality Data to NWISWeb

Major changes are forthcoming to the National Water Information System (NWIS) processes for compilation and display of water-quality data on the NWISWeb system (http://waterdata.usgs.gov/nwis/nwis). This memorandum provides detailed guidance to the U.S. Geological Survey (USGS) Water Science Centers (WSCs) on options for controlling the release of water-quality data based on the policies described in Office of Water Quality Technical Memorandum 2007.03. This memorandum supercedes Office of Water Quality Technical Memorandum 2000.10.

The flow of water-quality data into an aggregated national database and subsequent NWISWeb display are controlled by WSC personnel by controlling the aggregation frequency and the attributes of the stored data. The aggregated national database will be used internally for national program needs and NWIS redesign investigations. A subset of the aggregated national database will be used to serve data to internet users via NWISWeb.

Controlling the attributes of stored data:

There are NWIS attributes at the site, sample, and result levels that each provides restrictions on the release of data. The exclusion effects are cumulative. For example, restricting data for a site restricts all the sample and result data for that site, regardless of the sample- and result-level attributes. Similarly, restricting a sample restricts all the stored results associated with that sample.

Controlling the aggregation frequency (future enhancement):

 

Walton H. Low /s/ for Timothy L. Miller
Chief, Office of Water Quality

This memorandum supersedes Office of Water Quality Technical Memorandum 2000.10.

Distribution: All WRD Employees