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Alice Springs recreational dam hydrology report project 6



Alice Springs recreational dam hydrology report project 6


Jackson, D.; Paige, D.


E-Publications; E-Books; PublicationNT; Report no. 12/1979







Publisher name

Northern Territory Government

Place of publication



Report no. 12/1979

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Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



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Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 67 of 153. I I I I I I I I I I I I I I I I I I I I 41 Table 3 ANNUAL SUSPENDED SEDIMENT LOAD (l05 years) TONNES Average Conditions Dry (1965) Conditions Wet (1979) Conditions Nean 5.5 x lO.t,. 1.6 x 10 5 1.6 x 10" Hedian 3. 8 x 10" 7. ~ X 10 4 8.4 X 10 3 , Standard Deviation 5.1 X 10 4 2. 2 X 10 5 2 ~ 2 x 10 " 3.4 Reservoir Sedimentation 3.4.1 Trao Efficiency Model Brune's Hethod A standard trap efficiency analysis based on Brune 1 s curve (Thomas 1977) was carried out us~ng mean annual suspended sediment loads calculated in section 3.3. For a reservoir capacity of S.lMm 3 and a mean annual water yieLd. of 12.1 ~lm3, a reservoir detention time (detention time = reservoir capacity/mean annual water yield) of 0.42 years was calculated. This de~ention time corresponds to 95% trap efficiency. Assuming all bed load was trapped in the upstream sediment trap (section 3.5) and that the suspended sediment consisted of 10\ clay and 90% silt, estimates of reservoir capacity were made. Table 4 shows percentages of o~iginal reservoir capacity remaining after various time periods for each of the three suspended sediment relationships. Table 4 PERCENTAGE OF ORIGINAL CAPACITY REMAINING AFTER DI~FEREN~ PERIODS OF OPERATION, ASSUMING 95% TRAP EFFICIENCY. Time 50 100 Years Years Years Reservoir Suspended Sediment Relationship Average Conditions 77 54 18 full of silt. Dry (1965) Conditions 37 * * Wet (1979) Conditions 93 87

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