Batchelor water supply development study 1985.
Keith Lane & Associated Pty Ltd
E-Publications; E-Books; PublicationNT; Report ; 68/1985
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Dept. of Mines and Energy
Report ; 68/1985
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Technical Report WRD85068 Viewed at 15:07:30 on 29/07/2010 Page 17 of 58. I I I I I I I I I I I I I I I I I I I I 7.0 ,'lATER DEMAND 7.1 Standard Design Requirements: The standard required by the Department of Transport and Works is that the available head at any point in the system should be a minimum of 18 metres at the service connection under the peak hourly flow condition and a minimum of 10 metres when a fire flow of 25 L/s is applied to any point in the system during peak flow conditions. These pressures and the bores system. are required under normal gravity feed should not be directly supplying the 7. 2 Wat~er Production Records : The summarised water production records for the period September 1983 to September 1985 are shown graphically in Appendix B. These values were calculated from the combined bore production charts and the tank level recorder. As can be seen from the plot in Appendix B, some of the recordings are well away from the plotted mean curve. Unusually low values can be attributed to the flow recorders on the bores not recording at times, whereas unusually high values can be attributed to periods of tank dewatering, pump testing, etc. 7.3 Water Consumption Records: A summary of the most recent complete record of annual metered water consumption values (1983/1984) is listed in Appendix C. 7.4 Average Day The average day per capita consumption can be calculated by averaglng the annual metered consumption of 279 ML or 0.76 ML/d (refer Appendix C) over the Town's residential population, taken as 515. This gives the average day consumption as approximately 1485 litres per capita. 7.5 Peak Day: The peak day showed an average bore production rate of 25 L/s and a drop in reservoir level of 0.6 m - over a 24 hour period. From these figures a peak day consumption of 2.2 ML was calculated, which is 2.9 times the average day value of 0.76 ML. 2.2 ML is approximately double the storage capacity of the existing reservoir and highlights the immediate need for a second reservoir. At a consumers level, taps have run dry on a number of occasions during peak periods and the school has been forced to close twice due to lack of water. 13
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