Estimated Water Use Report - Southwest Florida Water ...

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2005 Estimated Water Use Report comparable when a system supplies a large amount of water to non-residential users, is subjected to large unaccounted for water use patterns (such as a major pipeline failure), or has access to reuse. Adjusted Gross Per Capita Water Use When Unadjusted Gross Per Capita water use is refined by subtracting “significant use”, “environmental mitigation” water, it is termed “Adjusted Gross Per Capita.” Significant use refers to the sum of the average consumption of all non-residential water customers who each use at least 25,000 gpd or five percent of system use, such as commercial users. Environmental mitigation refers to the pumping of water to replenish lakes and wetlands, which have been impacted by nearby Public Supply withdrawals, but only when this replenishment is required as a condition of a water use permit. The refinement of per capita water use data has a special purpose, particularly in the District’s declared Water Use Caution Areas. In these portions of the District, Public Supply permittees are required to meet certain percapita-water-demand-reduction goals. Adjusted Gross per capita data allow for more equitable permit-to-goal as well as permit-topermit comparison because it compensates for the effects of large non-residential users whose consumption may benefit an area, which extends far beyond a specific permittee’s service territory. Also, when communities fail to report a significant use (such as a power plant) on the voluntary survey, Table A-1 may show an unusually high gross per capita figure. In Table A-1 Public Supply Adjusted Gross Per Capita is examined for only those permittees located within a WUCA. During calendar year 2005, adjusted gross per capita within the District averaged approximately 111 gpcd (Table A-1). Residential Per Capita Water Use This measurement accounts for the portion of publicly supplied water that is used for residential purposes only. The percentage of residential water use reported to the District by a utility is multiplied by their total water use Southwest Florida Water Management District to quantify how much water is used for residential purposes only. Residential Per Capita differs from Unadjusted Gross Per Capita and Adjusted Gross Per Capita because it does not include any non-residential uses. Due to the limitation in billing systems, not all public supply systems are able to separate residential from other types of water use. Calculation of residential water was performed in Table A-2. If a utility supplies a large number of non-residential customers with water, their residential per capita will be significantly lower than their Unadjusted Gross Per Capita. For example, in 2005, the 116 gpcd (Table A-1) unadjusted gross per capita water use of the Manatee County Public Utilities service area is brought down to a residential per capita of 83 gpcd when nonresidential customers are removed (Table A-2). For those permittees able to provide sufficient demand details, the average residential per capita water use was estimated to be 80 gpcd during calendar year 2005 (Table A-2). County averages of residential per capita water use are compared in Table 2. Unaccounted for Water Unaccounted for water (also referred to as “UAW”) is the portion of water that enters the distribution system and is “lost.” Several situations can be contribute to UAW, including transmission pipeline failures, valve box leaks, unauthorized service connections, and production meters that are over–registering. Water used for customary purposes, such as firefighting and line flushing that can be estimated, is considered “accounted” and, therefore does not need to be included in a permittee’s UAW amount. Although a high UAW value generally indicates the need to address one or more of the problems listed above, a low UAW value does not necessarily indicate a tight, efficiently run system. If the source (withdrawal) meters are under-registering, a permittee may falsely appear to have a low or possibly negative UAW (i.e., the system bills for more water that it supposedly produces). Production and customer meter accuracy can only be ensured 20
2005 Estimated Water Use Report through periodic testing. The unaccounted for water use associated with permits that reported UAW data was also studied in the Table A-2. It shows that a total of 38 mgd from 485 mgd of system production (approximately 8 percent) was considered unaccounted. Public Supply Water Transfers Geographical conditions and population growth differences necessitate inter-county and/or inter-permit water transfers in some parts of the District. Such transfers will play an increasingly important role as more emergency interconnect systems are constructed and regional water supply authorities develop additional wholesale arrangements with their member systems. It is very challenging to trace the original amount of withdrawn water to its final use destination, especially when water is imported and exported among permits and/or across county boundaries. Table A-3 provides some detail of permit-to-permit water transfer. In the District, approximately 442 mgd was exchanged among water use permittees in 2005 (Table A-3). Monthly Water Withdrawal Because it is difficult to determine actual monthly Public Supply water use due to monthly variations in water transfers and treatment losses, the estimated withdrawal pattern is studied instead in this report. Monthly withdrawals reported for Public Supply in the district are shown in Table A-4. In the Preface section (Page 1) of this document, you can find important information regarding how to interpret Public Supply water withdrawal/use information tables. Southwest Florida Water Management District 21
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