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Inquiry into the Alice Springs Recreation Lake : submission by Department of Transport and Works



Inquiry into the Alice Springs Recreation Lake : submission by Department of Transport and Works


Marquardt, A.


E-Publications; E-Books; PublicationNT; Report ; 1/1983




Made available via the Publications (Legal Deposit) Act 2004 (NT).


Date:1983-12; Contains: Floodplains Management Alice Springs Impacts of Todd River Flooding. Also filed in Alice miscellansous collection A0342, A0343.



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Dept. of Transport and Works

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Report ; 1/1983

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Check within Publication or with content Publisher.

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Technical Report WRD83001 Viewed at 14:07:22 on 29/07/2010 Page 62 of 64. " (c) ( d) (e) (f) (g) . " Misunderstanding allegations that full; confusion rate. of how the' d~m WOt:..Lc. attenuate floods; there will be no'attenuation if the dam is over downstream flo,,- volume, duration and This is discussed in this submission. Confusion over ho'<.-v the dam might assist the vlater level and salinity problem in the Town Basin; allegations that use of a draft for park watering will increase the salinity problem. These matters are discussed in the submission. Concern over the uncertainty as to the extent and severity of downstream scour. is the and This is discussed in the submission. ~ihile this certainly one of the more uncertain aspects of studies carried out for the Feasibility Report EnvirOlli~ental Review, it is pointed out that the assessed extent and ;;everity of scour is such that there is considerable room for error w-ithout major environmental consequences arising. Concern over scour near the spillway discharges r and COhcern over possible damage to the Old Telegraph Station. Since these COIT~ents were made, hydraulic studies were conducted and reported on by S.M.E.C (S.M.E.C, 1981). The studies examined two spillway alternatives, and concluded that both "gave rise to significantly better conditions at the Telegraph Station at the higher discharges and effectively no agsravation of potential flood effects either from inundation or scouring at the Imver, more frequent discharges". While it was found tha't scour local to the river entry points would be substantial, protective mea.sures fl could be applied as necessary. II Concern over the need for catcr,lnent sedimentation; over uncertainties sedimentation rate of the dam. management to reduce in the estimates of 11: l'-NDYS This is discussed in the submission. It is to be noted that since the submissions have been received, further work on this subject has been undertaken by the Department and by the Conservation Co~~ission (1981). The poi"t was missed (or misunderstood) by some that the conserva"Clve estimate of 120 years for' complete silting was based on a very conse=vative (pessimistic) value, of reservoir trap efficiency and .on the assumption that the sediment yield of the catc0~ent was not Imvered by management measures.

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