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|Active Spring Monitoring Sites Network|
Map generated 4/22/2021 11:26:46 AM
The Active Springs Monitoring Sites web pages provide data from more than 100 springs in the active measurement program of the U.S. Geological Survey across the nation. A spring reflects concentrated discharge of groundwater at the land surface. This focused discharge integrates hydrogeologic processes over large areas, and provides information about groundwater conditions as well as aquifer characteristics.
These web pages contain all sites in the USGS NWISWeb system designated as type “Spring” with at least one discharge measurement available within the last 13 months, regardless of measurement frequency or the monitoring objective. Periodic discharge measurements and daily values calculated from real time and non-real time continuous measurements are presented for each site. Spring sites with stage only are not included. Monthly statistics of spring discharge are calculated and presented using the same procedures that are used for groundwater levels on other web pages within the Groundwater Watch system. For spring sites with at least one year of approved daily values, Groundwater Watch produces a flow-duration curve, as described by Searcy in USGS Water Supply Paper 1542a, "Manual of Hydrology: Part 2. Low Flow Techniques". The diagram indicates what percent of time that springflow is equal or exceeded during a given period. To produce this cumulative frequency curve, the daily discharge during the period of approved daily values are ranked by magnitude, and the percent of time during which the flow equaled or exceeded the specified values is computed.
Details about the Groundwater Watch system are available on the Help Page.