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Batchelor water supply development study 1985.



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).





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Dept. of Mines and Energy

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Report ; 68/1985

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Check within Publication or with content Publisher.

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Technical Report WRD85068 Viewed at 15:07:30 on 29/07/2010 Page 20 of 58. I I I I I I I I I I I I I I I I I I I I by the Department of Lands, is shown in rigure 1, followed by the projected town expansion in Figure 2. Simplification for analysis of the reticulation system in its present state is as shown in Figure E-l in Appendix E. The expanded network for the year 2000 is shown in Figure 8-2. 8.2 Results of Analyses: The first series of computer runs analysed the present water supply conditions in the Town for periods of peak demand. In such cases, when the reservoir water level is equal to the outlet level, pressure heads throughout the Town are well below the 18 metres required by the Department, some being lower than 10 metres. When the fire flow of 25 Lis is applied to areas of low pressure in the Town, the pressure head at almost all nodes drops to below 6 metres and to only 4 metres in some cases. The second model analysed allowed for duplicating the 225 mm diameter delivery mains from the reservoir to reduce the substantial losses in the single delivery main (as a possible first stage in the upgrading of the system). Although pressures around the system were then generally increased by approximately 2 metres under peak flow conditions and approximately 5 metres under peak and fire flow conditions, they were still below the Department's standard. The inadequate storage capacity requires the construction of a new reservoir, and a new location is available, giving a higher base water level in the tank. This matter is discussed in detail in the section entitled "Evaluation of Storage". The third series of computer runs involved the analysis of the system with the new reservoir connected - both for the existing situation and the year 2000. With the new reservoir connected to the existing system, the pressure head was above the standards required by the Department for both the peak flow and the peak plus fire flow design cases. However, when connected to the expected year 2000 system, pressures were below the required standards and it was obvious that the reticulation system would have to be upgraded. The final series of computer runs involved refining existing and proposed pipework so that pressure heads in the Town reach the Department's standard under both peak and fire flow cases. A full summary including relevant computer outputs is given in Appendix F. 16

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