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
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Power and Water Authority
Report ; 53/1989
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Technical Report WRA89053 Viewed at 03:02:00 on 18/02/2010 Page 124 of 139. I I I I I I I I I I I I I I I I I I I I Variations in Water Level After the passing of a tl00d, the water level in the dam would return to the level of the low level outlet (EL64S.D). Over time a further gradual reduction in water level would occur through evaporation and seepage. Neglecting losses through pumping water into the upstream filter of the main dam, the water level would normally operate within a I.Om band below EL64S.D, but \'iould drop further during particularly dry periods. An analysis of the water pool over a period of 18 years showed that on average the water level was less than EL644.0 for 40 days per year. The lowest water level over the same period was EL642.8. Estimated Cost The estimated capital cost of the "partially full" dam is $21.57 million at May 1991. Operating and maintenance costs are expected to be similar to those outlined in the EIS for the" full" dam with the following variations. less sand and gravel will need to be transported from the sediment traps to the spillway channel. some allowance will need to be made for selective removal of sediment deposited in the river channel upstream of the dam. 6