Territory Stories

Galiwinku Groundwater Resource and Evaluation DLH-492

Details:

Title

Galiwinku Groundwater Resource and Evaluation DLH-492

Creator

Yin Foo, Des

Collection

E-Publications; E-Books; PublicationNT; Report ; 6/1984

Date

1984-03-01

Description

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

Notes

Date:1984-03

Language

English

Publisher name

Dept. of Transport and Works

Place of publication

Darwin

Series

Report ; 6/1984

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/228082

Citation address

https://hdl.handle.net/10070/674611

Page content

Technical Report WRD84006 Viewed at 14:07:13 on 29/07/2010 Page 16 of 60. 2.3 Groundwater Movement and Recharge 2.3.1 Water Level Data Water level data from which flow regimes may be determined are scant. Bores have not been regularly monitored and since only isolated readings are available, correlation between them cannot be made. Furthermore, the dependency of potentiometric levels on tidal variation means that if any correlation is to be made, measured levels must be related to tidal records. The amplitude and time lag associated with each oscillation is a function of several factors which may result in a variation in tidal response between bores. A water level monitoring program will require either the use of continuous recorders or levels to be taken at fixed tidal events (ie high or low tide). The time lag of the response will be assumed negligible unless particular response characteristics of bores are established. Performance of the borefield should be assessed representative bores away from the centre of pumping. bore recommended for this purpose is bore RN 5463. 2.3.2 Groundwater Movement and Recharge using One The community is situated on the southern extremity of a wide flat ridge which traverses the study area, and is approximately parallel to the island. Much of the ridge is elevated at least 20 m above mean sea level. Since the aquifer is unconfined over most of this area, the phreatic surface is expected to reflect this topographical feature. Flows within and from the system should therefore be directed away from the ridge. Coastal depressions at the base of the ridge are featured by perennial lagoons which most likely recieve outflows from the aquifer. Where the aquifer dips with the confining strata to the west, flows are postulated to be preferentially strike orientated. Springs have formed in the exposed contact area west of the community. The postulated dry season flow regime is shown on Fi-gare 2.3. Recharge to the aquifer is by direct infiltration of rainfall over an approximate area of 27 km'. This represents the aerial extent of the unconfined aquifer. The safe yield of the aquifer has been estimated in Appendix C. Analyses considering both estimated throughflow and total recharge indicated it to be in the order of 3000 ML/year. It should be noted that the maximum yield is limited by borefield configuration, and will be less than the above figure.


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