rainfall map This page compares rainfall for the last 12 months, and river flow over the last year and last 10 years, to normal levels. The rainfall map is updated monthly; river flows are updated weekly.

At left, “aquifer and water resource updates” links to weekly news releases providing rainfall and water level information; “hydrologic conditions” links to a monthly hydrologic conditions report; and “structure operations hydrographs” links to a weekly report that shows water levels on lakes and rivers where the District has dams or gates.

12-Month Rainfall
Comparison to Normal

July 2007 through June 2008

This map shows rainfall distribution over the 16-county District by comparing rainfall levels for the most recent 12-month period to historic averages. Rather than relying on one rain gage, the map is produced by extracting data from multiple gages throughout the District. Results are color-coded comparisons to the normal range (48–57 inches): areas shaded blue are considered very wet compared to normal; green represents wetter than normal; yellow is normal; orange, drier than normal; and red is very dry.

Printable PDF version of 12-month rainfall

River Flows

Last update to river flow plots: August 12, 2008.

River flows naturally fluctuate seasonally, with the highest flows normally seen during and immediately after the rainy season (June–September), and the lowest flows at the end of the dry season (October–May). To gage the health of the river, it’s important to compare the flows to the historic averages for that time of year.

The plots below show flows for four rivers over one-year and 10-year time periods. Readings are placed in four categories: above normal, normal, below normal and extremely low. Plots show how actual river fluctuations over those time periods compare to normal flows based on historic averages.

Please note that the 10-year plots include the drought of record in 2000, which is reflected by the extreme low flows during 2000–2001.

Printable PDF version of 1-year and 10-year river flows

Alafia River at Lithia — one-year period

Alafia River one-year river flow

Alafia River at Lithia — 10-year period

Alafia River 10-year river flow

Hillsborough River near Zephyrhills — one-year period

Hillsborough River one-year river flow

Hillsborough River near Zephyrhills — 10-year period

Hillsborough River 10-year river flow

Peace River at Arcadia — one-year period

Peace River one-year river flow

Peace River at Arcadia — 10-year period

Peace River 10-year river flow

Withlacoochee River near Holder — one-year period

Withlacoochee one-year river flow

Withlacoochee River near Holder — 10-year period

Withlacoochee 10-year river flow
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