notebook - Southwest Florida Water Management District

swfwmd.state.fl.us

notebook - Southwest Florida Water Management District

Item 34

Operations and Land Management Committee

October 30, 2012

Discussion Item

Hydrologic Conditions Status Report

This routine report provides information on the general state of the District's hydrologic

conditions, by comparing rainfall, surface water, and groundwater levels for the current month to

comparable data from the historical record. The data shown are typically considered final, fully

verified monthly values, but occasionally, due to timing of publication, some data are identified

as "provisional," meaning that the values shown are best estimates based on incomplete data.

The information presented below is a summary of data presented in much greater detail in the

Hydrologic Conditions Report published the week before the Governing Board meeting, which

also includes an updated provisional summary of hydrologic conditions as of the date of

publication. It is available at http://www.swfwmd.state.fl.us/waterres/hydro/hydro.htm.

Rainfall

Provisional rainfall totals as of September 30 th were below-normal in the northern and southern

regions of the District, while they were in the low-normal range in the central region. The normal

range is defined as rainfall totals that fall on or between the 25 th to 75 th percentiles derived from

the historical data for each month.

• Northern region rainfall averaged 3.69 inches, equivalent to the 19 th percentile

• Central region rainfall averaged 5.21 inches, equivalent to the 29 th percentile.

• Southern region rainfall averaged 5.10 inches, equivalent to the 21 st percentile.

District-wide, average rainfall was 4.75 inches, equivalent to the 21 st percentile.

Streamflow

Streamflow data for September indicate that flow in regional index rivers increased in the

northern and southern regions of the District, while it decreased in the central region, compared

to the previous month. Regional streamflow conditions ended the month within the normal range

in all three regions of the District. Normal streamflow is defined as flow that falls on or between

the 25 th and 75 th percentiles.

• The monthly average streamflow in the Withlacoochee River near Holder in the northern

region was in the 62 nd percentile.

• The monthly average streamflow measured in the Hillsborough River near Zephyrhills in the

central region was in the 66 th percentile.

• The monthly average streamflow measured in the Peace River at Arcadia in the southern

region was in the 59 th percentile.

Groundwater Levels

Groundwater data for September indicate levels in the Floridan/Intermediate aquifer increased

in all three regions of the District, compared to last month. Groundwater conditions ended the

month within the normal range in all three regions. Normal groundwater levels are defined as

those falling on or between the 25 th and 75 th percentiles.

• The average groundwater level in the northern region was in the 66 th percentile.

• The average groundwater level in the central region was in the 75 th percentile.

• The average groundwater level in the southern region was in the 52 nd percentile.

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