Estimated Water Use Report - Southwest Florida Water ...

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2005 Estimated Water Use Report Important Information Regarding Tables A-1, A-2, and A-3 The holder of each Public Supply permit issued for 100,000 gpd or greater receives an "Annual Public Supply Permittee Survey" which requests various information about the permittee's water use. The survey includes inquiries regarding pumpage, imports, exports, treatment plant loss, significant use, environmental mitigation, service population estimates (both permanent and seasonal), reuse and desalination information, interpermit transfer information, and percentage breakout by customer-type. Each Public Supply permittee located within a Water Use Caution Area (WUCA) is required to supply the District with answers to the survey's questions by April 1st of each year. All other permittees not located within a WUCA respond to the survey on a voluntary basis only. A compilation of the data received by the District is presented in Tables A-1, A-2, and A-3. An exclamation point located after a permittee's name on each table identifies those permittees who did not submit the requested information. In this case, the District estimates the requested data using the District's Regulatory Database, the Bureau of Economic and Business Research's (BEBR's) population estimates, and any other resources the District feels are appropriate to make a reasonable estimate for that permit. In addition, if withdrawal information submitted to the District is significantly different than BEBR estimates, an individual evaluation is made using BEBR and the permittee's submitted data. It is also important to note that compliance checks of the information submitted to the District are independent of this report. Interpretation of Table A-1. Table A-1 presents a detailed list of Public Supply water use throughout the District. The first three columns are "County of Use," "Permit Number," and "Permit Name," and are all self explanatory. Column Four, Southwest Florida Water Management District "Withdrawal," refers to the amount of water withdrawn from the wells and pumps associated with the named withdrawal points of the permit. The withdrawal source can come from either surface water, ground water or reverse osmosis of brackish water and is indicated in Column Five. "SW" refers to Surface Water, "GW" refers to ground Water and "RO" refers to Reverse Osmosis. If a permit purchases or transfers water from another supplier it is referred to as "imported" water. The sum total of water "imported" by a permit from any other permit(s) is listed under Column Six. Conversely, water sold or transferred to any other permit(s) is considered "exported" water. The sum total of water "exported" by a permit to any other permit(s) is listed under Column Seven. "Treatment Loss" refers to water lost during the treatment process. Typically, the two major processes that result in "lost" water are sand filtration and reverse osmosis. The majority of potable water "lost" during sand filtration is due to the backwash process. Water "lost" during the reverse osmosis process is mostly the result of discharging the concentrate byproduct. Any "Treatment Loss" associated with a permit is listed under Column Eight. “Gross Use" is simply the calculation of "Withdrawal" plus "Imports" minus "Exports" minus "Treatment Loss." It quantifies the amount of water distributed throughout the permit's service area on an average daily basis. "Gross Use" for each permit is identified in Column Nine. "Population" is the number of people located within a permittee's service area. This number may include both seasonal and permanent residents. For areas where there are significant seasonal fluctuations, a weighted average adjustment of the populations may have been submitted to the District and is reported in Table A-1. Otherwise, the permanent population is shown. "Population" of each permit's service area is located under Column Ten. "Unadjusted Gross per Capita Use" is the calculation of "Gross Use" divided by 56
2005 Estimated Water Use Report "Population." "Unadjusted Gross Per Capita Use" is generally considered to be populationrelated withdrawals of water associated with residential, business, institutional, industrial, miscellaneous metered, and unaccounted uses. It is important to note that in previous editions of Estimated Water Use, "Unadjusted Gross Per Capita Use" was simply called "Gross Per Capita. All Public Supply permits have an "Unadjusted Gross Per Capita Use" value identified in Column Eleven. "Significant Use" is defined as an individual non-residential customer using 25,000 gallons per day or greater on an annual average basis, or an individual non-residential customer whose use represents greater than five percent of the utility's annual water use. "Significant Use" is reported under Column Twelve. "Environmental Mitigation" refers to quantities permitted by the District which allow for the pumping of water to a specific area for nonconsumptive environmental purposes. These values are reported under Column Thirteen. "Gross Per Capita" refers to a populationrelated water use which allows for the deduction of "Significant Use" and "Environmental Mitigation" and can be found in Column Fourteen. "Gross Per Capita" is a value that only applies to those permits located within a WUCA as stated in Chapter Seven of the Basis of Review of the Florida Administrative Code, Rule 40D-2.091. If a permit is not located within a WUCA, no value is shown but it is important to note that the calculation of gross per capita is the best measure of service-area-population-based residential and commercial water use efficiency. "Gross Per Capita" = ("Gross Use" minus "Significant Use" minus "Environmental Mitigation") divided by "Population." "Reuse/Desalination Credit" is best explained by separating the two available credits. A "Reuse Credit" is identified if a utility provides reclaimed water to customers outside of its service area. The purpose of the credit is to provide equity between utilities that provide reclaimed water to customers within their service area, which tends to reduce per capita usage, and those that provide reclaimed water to non-service area customers, which does not reduce per capita water usage. The "Reuse Credit" is equal to the amount of water that would be permitted for a freshwater withdrawal for that use. The "Desalination Credit" is an incentive to develop desalinated water sources. The "Desalination Credit" is equal to 50 percent of the finished water produced from desalination. Both credits are identified under Column Fifteen. At this time, both the "Reuse and Desalination Credits" are only valid if a permit is located within a WUCA. However, if a permit submitted information to the District claiming they met the guidelines to either type of credit (even though they are not located within a WUCA), the value of the credit is shown but no "Compliance Per Capita" is calculated. "Compliance Per Capita" is a population-related water use which allows for the deduction of "Significant Use," "Environmental Mitigation," and a "Reuse/Desalination Credit." "Compliance Per Capita" is a value that only applies to those permits located within a WUCA and is calculated in Column Sixteen. For those permits falling outside of a WUCA, no value is shown. The formula is as follows: "Compliance Per Capita" = ("Gross Use" minus "Significant Use" minus "Environmental Mitigation" minus "Reuse/Desal Credit") divided by "Population." Interpretation of Table A-2 As part of the requirement of permits located within WUCA boundaries, each Public Supply permit holder must provide the District with information regarding their service area. The utility's water distribution must be categorized into the following areas by percentage: Agricultural, Industrial/Commercial, Mining/Dewatering, Residential, Recreational/Aesthetic, Fire/Other, and unaccounted for water. All non-WUCA permits submitting this information are done on a voluntary basis. Permittees who did not submit data to the District appear with an Southwest Florida Water Management District 57
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