2011 Estimated Water Use - Southwest Florida Water Management ...

2011 ESTIMATED WATER USE REPORT
EXECUTIVE SUMMARY
The Estimated Water Use (EWU) Report analyzes
and summarizes the withdrawal and use of
regulated groundwater and surface water from
natural surface water bodies in the Southwest
Florida Water Management District (District).
The EWU report is generally used as a data
source for a variety of water supply planning and
management purposes. It is not used to
determine compliance with terms and conditions
of the water use permit (WUP).
In the District, there were 7,745 water use
permits (WUPs) in active status in 2011 that
were permitted for 1,911 million gallons per day
(mgd) on an annual average basis.
The water withdrawn for agriculture, industrial/
commercial, mining/dewatering and recreation/
aesthetic uses were used when and where they
were withdrawn. The water withdrawn for
public supply went through treatment
procedures that caused some water losses, and
large quantities of potable water were
transported between utilities as imports and
exports, causing distribution losses. Thus, for
public supply, water is frequently not used in the
same quantity as was withdrawn or where it was
withdrawn. Table A‐1 in Appendix A gives
details on treatment losses, imports and exports.
The following table shows the 2011 Districtregulated
water withdrawals.
Total Withdrawals
AG I/C M/D PS R/A TOTAL
MGD 390 54 22 520 62 1,048
Portion
of Total 37% 5% 2% 50% 6% 100%
(excludes domestic self‐supply)
As shown in the table above, the total amount of
water withdrawn from the groundwater and
surface water resources via regulated
withdrawal points in the District was 1,048 mgd
(Table 10). The largest water withdrawals were
for public supply for 50% of the total pumpage in
the District. The second largest water
withdrawals were for agricultural water use for
37% of the total District water pumpage.
Approximately 87% of the total (estimated +
metered) pumpage was from groundwater,
assuming domestic self‐supply was all from
groundwater.
The following table shows the total water use in
the District for 2011.
Total Use
AG I/C M/D PS R/A TOTAL
MGD 390 54 22 493 62 1,022
Portion
of Total 38% 5% 2% 49% 6% 100%
(excludes domestic self‐supply)
Including an estimate for domestic self‐supply
(37mgd), the total quantity withdrawn was
1,085 mgd (Table 9). After imports, exports and
treatment losses for public supply water, the
total water used in the District was 1,059 mgd
(including domestic self‐supply).
PUBLIC SUPPLY
The public supply use category includes public
water systems, privately held water utilities,
entities that provide potable water to persons
other than household members as well as
residential lawn and landscape irrigation. Public
supply is shown as both water withdrawn
(pumped) and water used after treatment losses,
imports and exports are accounted for.
Public Supply Annual Reports Public supply
permittees having 100,000 gpd or more annual
average quantities permitted for public supply
on their WUP are required to submit a Public
Supply Annual Report (PSAR) by April of each
year for the previous calendar year. The District
received 160 PSAR forms for the 2011 calendar
year. There were discrepancies (most of which
were minor) found between the pumpage given
on the PSAR forms and the pumpage recorded in
the Water Management Information System
(WMIS) for 35 WUPs. Significant discrepancies
were investigated prior to presenting this data,
and obvious errors in the database were
corrected. Since the WMIS pumpage data exists
in much more detail, it was used for 94% of the
public supply WUPs for which a PSAR form was
submitted.
Total Public Supply
Withdrawal Totals
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