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 95 of 139. I I I I I I I I I I I I I I I I I I I I Effect on Dam Stability The rapidly varying water levels resulting from the till and drain sequence arc undesirable with regard to the stability of the upstream face and it is probable that a t1atter slope with a corresponding increase in the earthworks volume and outlet pipe length may be required. The instability can be reduced to a minimum by maintaining as high a water level as possible. This latter requirement also assists directly in maintaining core moisture to prevent cracking in the lower embankment levels and provides a reservoir for pumped replenishment 0 f moisture to the upper levels 0 f the core. CONCLUSIONS The "full" dam remains the preferred option from a technical viev.'Point. Given that this is not now acceptable to Traditional Custodians. the next best option is for a "pamally full" dam with a water level as high as possible whilst still being acceptable to Custodians. It was on this premise that the water level of EL 645 ,vas selected. The capacity of the low level outlet of 20 ra'ls is a compromise between mostly conr1icting advantages and disadvantages of small and larger outlets. The proposed "partially full" dam would achieve a high level of nood mitigation. provide some water for maintenance of core moisture levels but not permanently inundated Tnyere-Akerte. ..
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