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{F E. SYSTEM AUDIT/PROBLEMS <br /> 1. System Audit: <br /> a. Average, seasonal, peak use patterns. Figures 1 through 4 best illustrates <br /> average, seasonal, and peak use patterns. Figures 1 through 3 are for individual <br /> entities, with Figure 4 representing the total Authority. These figures indicate that <br /> the La Porte Area Water Authority follows most cities in having higher average <br /> water use in the summer months from lawn watering. The peak to average use <br /> ratio (average daily summer use divided by average annual daily use) is 1.32 for <br /> the Authority. This ratio is relatively low because of the very humid climate and <br /> high average rainfall the area receives. <br /> b. Unaccounted water volumes and likely causes. Figures 1 through 4 illustrates the <br /> relationship between water production and sales for each individual entity and the <br /> Authority as a whole. The difference between production and sales can typically <br /> be attributed to all or some of the following: <br /> 1. Flushing of water mains <br /> 2. Fire fighting <br /> 3. Inaccurate metering <br /> 4. System leaks <br /> 5. Unauthorized water use <br /> 6. Unmetered water sales <br /> C. Adequacy of treatment, storage, and distribution system. <br /> The cities of La Porte, Morgan's Point, and Shoreacres presently obtain 90% of <br /> their water supply from surface water supplied by the La Porte Area Water <br /> Authority. The surface water is purchased by the Authority from the City of <br /> Houston's Southeast Water Purification Plant. The remaining 10% of their water <br /> needs are supplied from groundwater wells. The water is tested on a regular <br /> basis in accordance with all state and federal regulations. The Cities of La Porte, <br /> Morgan's Point and Shoreacres currently have adequate storage facilities <br /> required to meet the state's "Minimum Water Quantity Requirements for Public <br /> Water Supply Systems". <br /> d. Limit of existing supply/potential new sources. <br /> It is apparent from the systems audit that all three (3) entities are very capable of <br /> providing water to their customers from groundwater sources. In addition, the <br /> distribution and transmission systems are adequate to supply their needs for <br /> several years. <br /> With the conversion to surface water, the adequacy of groundwater supplies to <br /> meet peak load demands in any drought contingencies that might occur are <br /> apparent. However, due to the constraints imposed by the Harris-Galveston <br /> Subsidence District on groundwater withdrawal, these sources will only be used <br /> to supply peak demand in possible drought contingencies. <br /> 4 <br />