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 11 of 58. I I I I I I I I I I I I I I I I I I I I 5.0 CONDITION OF EXISTING WATER SUPPLY SYSTEM 5.1 Asbestos Cement Water Mains: According to the local contractor responsible to Water Division for the caretaking of the water supply system, these are the original lines installed from 1953 onwards, and only a small number of line breakages have occurred to date. During January, 1985, 3-4 breakages occurred which have been attributed to increases in line pressure as a result of the valve on the downstream side of the connection from bore #5 to the rising main being accidently left open. The supply from bore #5 by-passed the storage tank and was pumped directly into the reticulation. Apparently, the valve had been open for some time before complete line failure occurred possibly due to a combination of ground movement resulting from soil saturation during the wet season and increased line pressure. It is considered essential that the effect of any future upgrading of the water supply system which may result in increased line pressures be appraised at that time. This is discussed further in Section 11.0 covering New Works. More frequent breakages may also be anticipated following upgrading of the system as the existing mains are now approaching the limit of their design life. 5.2 Bores: Bores #2, #3, and #4 tank which cannot be required only in the dry be run simultaneously. pump directly into by-passed. These season and are not the storage bores are required to After start up, the water from these bores is turbid and the pumps must be run for periods in excess of two hours before the water runs clear and can be fed into the system. At this stage the water has a "milky appearance due to the amount of fine air bubbles in suspension which soon clears when allowed to stand. Bores #5 and #6 are connected to a separate rising main which is also connected directly to the reticulation via a 225 mm diameter AC line. This connection is used only in emergencies or when the tank is empty, however as mentioned previously, the line has been accidently left open for extended periods. 5.3 Pumps: Operational difficulties are experienced, particularly during the dry, with supply from bores #5 and #6. After pump switch-off, there is a three hour timer delay before the pump switches on again. If there is only a brief power failure, and this often occurs daily during the dry, the timer resets and the pumps may not operate for periods in excess of 6 hours. Provision of a 7
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