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FDEP Temporal Variability (Trend) Network
 

sunrise on lakeThe Trend Network examines long-term changes in Florida’s ambient water quality. The network consists of 125 fixed stations whose locations are based on Florida’s 52 U.S. Geological Survey drainage basins. The Department manages this network, along with a complementary program called the Status Network. Data collected by both networks are used to develop action plans to protect and restore our water resources.

The Trend Network is divided into surface water (SW) and ground water (GW) components. In both the SW and GW Trend Networks, water samples are analyzed for a suite of water quality indicators.

surface water samplingSurface Water Trend Network

The SW Trend Network consists of 76 fixed stations in streams, rivers, and canals. Most of the sites are located at the lower end of a USGS drainage basin and are situated at or near a flow gauging station. These sites allow the Department to obtain chemistry, discharge, and loading data at a point that reflects the watershed’s water quality. Some SW sites are located at or near the state boundary with Alabama and Georgia. These stations measure the conditions of major streams entering Florida.

SW Trend sites are sampled each month by personnel working for the Department, the Water Management Districts (WMDs), and county agencies. All samples are analyzed in the Department’s Central Laboratory.

Ground Water Trend Network

samplers on a lakeThe GW Trend Network consists of 49 fixed stations (25 unconfined aquifer wells, 22 confined aquifer wells, and 2 spring vents). These sites are located so that each USGS drainage basin has a representative site for both the confined and unconfined aquifer systems, when both of these systems are present in the basin.

As with the SW Network, GW Trend sites are sampled by the Department, the WMDs, and county agencies. The Department’s Central Laboratory performs all sample analyses. Because the water chemistry in confined aquifers changes much more slowly than in unconfined aquifers, field measurements are taken quarterly at confined sites and monthly at unconfined sites. Samples for laboratory analysis are collected quarterly at all GW sites.



We are grateful to the citizens and the public & private agencies that provide us access to sample for regional and statewide water quality.

Last updated: January 28, 2013

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