Flood Warning and Damages in Alice Springs: Part 1 Executive Summary. Part 2 Tangible Damages Part 3 Intangible Damages & Emergency Procedures
Handmer, John; Smith, D. I.; Greenaway, Mark
E-Publications; E-Books; PublicationNT; Report ; 53/1989
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Power and Water Authority
Report ; 53/1989
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Technical Report WRA89053 Viewed at 03:02:00 on 18/02/2010 Page 129 of 139. I I~ I I I I I I I I I I I I I I I I I I Drought ReJeases As the "partially full" dam would only store 300 ML when full, it does not have any significant capacity for releases during extended dry spells (refer 6.08 of E1S). Tnyere-Akerte Aboriginal Sacred Site Concerns over permanent inundation of the Tnyere-Akerte site was the reason for suspension of work on the "full" dam and the revised proposal for a "partially full" darn. The Tnyere-Akerte site is upstream of the llood mitigation darn and would be temporarily inundated during flooding. However unlike the "full" darn, this inundation would not be permanent and the water level behind the darn would drop down to the level of the low level outlet at EL64S.0. The site is inundated naturally during flooding of the river. The time taken for the water level to drop to EL64S.0 is difficult to quantify but would not be ionger than 6.5 days after the cessation of flow into the dam. The water level would drop further through evaporation and seepage and would generally vary within a l.Om range below EL645.0, but during dry periods would drop further. The area described by AAPA as Tnyere-Akerte covers an area of approximately 14ha including a section of river channel. To determine the impact of the water pool on individual clements within the site it is necessary to consult contour maps/aerial photographs. Besides temporary inundation, the other impact on Tnyere-Akerte would be a coating with a nne blanket of silt following flooding, similar to what is experienced currently in existing waterholes along the creek. No construction activity would take place in the vicinity of Tnyere-Akerte. River Red Gum Trees For the" full" dam, vegetation permanently inundated by the dam including 300 mature river red gums was to be cleared. This would not be required for the "partially full" dam, and river red gums in the river would remain. Some of these trees would have their base in water, and may eventually die. The number of trees affected would not be expected to exceed 262 trees. Sediment Deposition Upstream of Dam An estimated average of 28,000 tonnes/annum of fine silt is expected to be deposited over the area upstream of the dam. The silt would be deposited in a blanket over the area temporarily inundated during rlooding. 11
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