Territory Stories

East Alligator district centre water supply assessment : Kakadu National Park



East Alligator district centre water supply assessment : Kakadu National Park

Other title

D . Pidsley


Jamieson, M.; Pidsley, D.; Paiva, Jerome


E-Publications; E-Books; PublicationNT; Technical Report ; 26/1991




Made available via the Publications (Legal Deposit) Act 2004 (NT).






Water-supply -- Northern Territory -- Kakadu National Park; Groundwater -- Northern Territory -- Kakadu National Park; Kakadu National Park (N.T.)

Publisher name

Power and Water Authority

Place of publication



Technical Report ; 26/1991


1 v. : ill., maps ; 30 cm.

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Technical Report WRD91026 Viewed at 15:07:48 on 29/07/2010 Page 19 of 107. further complicated. by the inaccurate readings displayed on the monitor of the pH unit. On 4 December 1990 the unit displayed a pH of 3.88 for incoming water and 8.11 for outgoing water. At the same time pH measurements were taken on water sampled from RN 23499, which wa;; pumping to the correction unit, and from the tap in the pump house (after water had passed through the correction unit, "the storage tanks, and the pressure pu.mps). The bore water had a pH of 4.6 and the water from the tank had a pH of 4.6 also (see Section 2.4.4). This method of water treatment is prone to operational problems and may pose a health risk should overdosing occur. 2.1.6 Overview of the System The East Alligator District water supply is pumped mostly from RN 23449 and RN 23450. It is pumped to elevated storage tanks adjacent the ranger station workshop. From here it is reticulated to the houses, camping areas, Border Store, fish cleaning facility and the Obiri Rock amenities block Eoi ther under gravity or "with the aid of booster pumps. Provision is also made for the possibility of pumping from other bores, namely RN's 20480 and 20636. 2.2 OPERATION Water is pumped from either RN 23449 or RN 23450 to the storage tanks via the pH correction unit in the treatment and pump house. Water could also be pumped from RN 20636 but the latter has not been used recently. The bore hole pumps are manually started and switch off automatically when the storage tanks are full. From the storage tanks adjacent the treatment and pump house water is pressurised to the Merl camping area, Obiri day use area, Border Store and youth hostel and to the fish clHaning facility during the tourist season when the drawoff is a.t its peak, and gravitated at other times. Water to the ranger housing area is pressurised. The pressure pumps are opera1:ed as per the instructions set out in Diagram 3. The tanks take about 12 hours to fill when there is no drawoff and an estimat:ed 16 hours at times of peak drawoff. Water supplied to Obiri., the 005MJ