Territory Stories

Waterloo Station : a report for the station manager



Waterloo Station : a report for the station manager

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R. Sanders and L.R. Rajaratnam; Water Resources Survey of the Western Victoria River District. Waterloo Station. A Guide for Water Resources Management.


Sanders, R.; National Landcare Program (Australia); Rajaratnam, L. R. (Lakshman); Northern Territory. Power and Water Authority. Water Resources Division


E-Publications; E-Books; PublicationNT; Report No ; 24/1994




Waterloo Station


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


Date:1995; On cover 'National Landcare Program'. Cover title: Water resources of Waterloo Station. Bibliography: leaf [10]




Groundwater -- Northern Territory -- Waterloo Station; Water-supply -- Northern Territory -- Waterloo Station; Water resources development -- Northern Territory -- Waterloo Station


Report No ; 24/1994


[15] leaves : illustrations (some colour) and maps (1 colour) ; 30 cm.

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natural stream to the tank. This is an improvement on the onstream design, but has excessive excavation costs since to take advantage of short lived stream flows the tank level must be below that of the natural stream bed. Both designs are not recommended. The offstream tank (Fig. 4) is effectively the same as an excavated hillside storage, but in an area with very little slope. The tank itself is of the same design as the off creek one, but without an inlet channel. The tank is excavated in a drainage area which does not have a defined creek system, and water may be directed towards it using catch drains or wing walls. Sheet flow on the floodplains, with its lower silt load, may be harvested in this manner. This design is most suitable for Waterloo and has been used successfully on Bradshaw Station in a similar situation. 4.6 Selection of Sites for Excavated Tanks The selection of a site for an offstream excavated tank is determined by the availability of a catchment producing sufficient runoff and ground conditions capable of holding the water. It is best located on flat or gently sloping ground. Excavation will be minimised where the tank site has some slope, say about 1%, to allow bunds constructed from excavated material to add to the storage volume of the tanks. Areas suitable for consideration are summarised on the water resources development map. Following selection of a general area more detailed investigation is required (Appendix 4) and may require the input of an geotechnical consultant. For these storages a minimum catchment area of between 1 and 3 km2 is required. Cracking clays (eg. blacksoil) and the rippable (by a D6 size bulldozer) shales of the Angalarri Siltstone are suitable for holding water. The shales have shown no leakage problems in excavations on Bradshaw or Amanbidji Stations. Areas of sandstone or basalt are generally unsuitable for this design since excavation will be uneconomical, usually requiring the use of explosives. Site investigations should check the rippability of outcropping shale, and are critical where soils are to be excavated. Generally soils in the Wave Hill and Ivanhoe land systems (see "The Land Systems and Land Units of Waterloo Station" map) are the main areas worthy of consideration, and the site investigation procedure outlined in Appendix 4 should be undertaken before final site selection is made. Remedial work (eg. compaction of a clay liner), or reselection of the site will be necessary where dispersive or sandy soils, or high permeability zones are encountered. Shale below the soil is more expensive to excavate but forms a watertight base to a tank. 4.7 Design of Excavated Tanks Design dimensions for the excavated tank are determined by the