WATER TANK Definition: A retaining structure designed to hold water, constructed either at surface level or sub surface level. Generally located in an elevated position to secure pressure for onward supply to a water distribution network. Alternate Terms: Reservoir | Capture as a 2D polygon if feature is rectangular in shape. Capture as a 2D circle if feature is circular in shape. The general outline is plotted from orthorectified imagery If the feature is captured as a circle, convert the circle to a polygon. Select the feature, hit on the Generalize command in ARC. In the Maximum allowable offset: dialog box, type in the range of 0.25 to 0.5 The Locations can be obtained from the cadastre. Locations can be obtained from other datasets, existing mapping, address details, Local Government websites, or other source material.
| WATER TOWER Definition: A tower generally constructed of steel supporting a water tank designed to hold drinking water, thus providing pressure for the onward supply to a water distribution network. Alternate Terms: | Capture as a 2D polygon if feature is rectangular in shape, capture the base of the tower Capture as a 2D circle if feature is circular in shape, capture the base of the tower. Minimum capture size is a diameter of 15 metres, if required exaggerate to conform The general outline is plotted from orthorectified imagery If the feature is captured as a circle, convert the circle to a polygon. Select the feature, hit on the Generalize command in ARC. In the Maximum allowable offset: dialog box, type in the range of 0.25 to 0.5 The Locations can be obtained from the cadastre. Locations can be obtained from other datasets, existing mapping, address details, Local Government websites, or other source material.
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