Riviera Bay, Middle Tampa Bay Watershed

Southwest Florida Water Management District calculates the Aquifer Resource Indicator (ARI) for their three groundwater regions each month. The ARI was created to provide the public with a gauge of groundwater levels in their area, so they can develop an understanding of the severity and cycles of drought and recovery. The three regions include: North (Citrus, Hernando, Lake, Levy, Marion and Sumter counties), Central (Hillsborough, Pasco, Pinellas, and Polk counties), and South (Charlotte, DeSoto, Hardee, Highlands, Manatee, and Sarasota counties). Learn More about the Aquifer Resource Indicator >>

To determine the ARI for a region, each well is compared weekly to its respective low-normal value and the difference is calculated. The weekly differences are reduced to a monthly value for all monitoring wells within a region, and the resulting ARI value represents how far water levels in the aquifer must rise or fall to reach their respective low-normal values.

Source: SWFWMD Hydrologic Data Section Data
Click here to view a period of record graph for the central, north, and south groundwater regions

The following data are summarized as seasonal average values for lake and river sampling locations located within the watershed. While these data are useful to serve as a general picture of watershed health, these data must be viewed with caution because these samples have been taken from ecologically different water resources.

Rivers:

Samples from most rivers located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	Graph		Graph

Source(s): LAKEWATCH Volunteer Water Quality Monitoring, PINELLAS Water Quality Data

Lakes:

Samples from most lakes located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
JUL-SEP 2012	1,365 ug/l		113 ug/l		2	2
JAN-MAR 2012	1,838 ug/l		290 ug/l		2	2
OCT-DEC 2011	3,087 ug/l		365 ug/l		1	1
JUL-SEP 2011	643 ug/l		69 ug/l		2	2
APR-JUN 2011	1,590 ug/l		72 ug/l		1	2
JAN-MAR 2011	1,957 ug/l		246 ug/l		3	3
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	Graph		Graph

Source(s): LAKEWATCH Volunteer Water Quality Monitoring, PINELLAS Water Quality Data, FDEP Ambient Monitoring Sampling Data, South West Florida Water Management District Sampling Data, FDEP, Water Quality Standards and Special Projects (Florida), SWFWMD Water Quality Monitoring Program Data, USGS National Water Information System

River	Flows Whole River Range	Flows Data by Segment	Levels Whole River Range	Levels Data By Segment
Sawgrass Lake East Outfall Canal	In the past 30 days Recent river flow data is unavailable.	No data table or graph available	In the past 30 days Average water levels are the same as they have been historically.	Levels Data Table and Graph

Source(s): LAKEWATCH, Southwest Florida Water Management District, Southwest Florida Water Management District, USGS National Water Information System

Source(s): Not Available