Technical Report WRD87041
WATER RESOURCES DIVISION
DEPARTMENT OF MINES AND ENERGY
BORE COMPLETION REPORT
DOUGLAS HOT SPR INGS
BORE
24557
Prepared by:
Danuta Karp
Hydrogeologist
Assessment Branch
February 1987
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Page 1 of 12.
Technical Report WRD87041
CONTeNts
1.
INTRODUCTION
2.
HYDROGEOI,OGY
3•
WATER QUALITY
4.
WATER DEViAND
5.
RESULTS
6.
REC0l4MENDATIONS
REFERENCE
ATTACHMENTS
1.
TEST REPORT - BORE 24557
2.
PUMPING PERFORNANCE - BORE 24557
3.
COHPOSITE LOG - BORE 24557
DISTRIBUTION
Conservation Commission of the
Northern Territory
Darwin
2
Water Resources Library
1
Water Resources Division Bore Data File
1
111:HYGEO
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Technical Report WRD87041
-
LIST OF TABLES
1. GROUNDWATER QUALITY
111 : HYGEO
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Technical Report WRD87041
LIST OF A88RIEVIATIONS
MiG
Australian map grid
kPa
kilopasca1s
Lis
litre per second
Llelday
litre per capita per day
m
metre
mS/day
cubic metre per day
mID
millimetre
111 : HYGEO
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Technical Report WRD87041
1. INTRODUCnON
The objective of this work \"as to investigate the
groundwater potential and subsequently construct a
production bore providing ,vater supply for the camping
site at Douglas Hot Springs.
The Douglas Hot Springs is located approximately 180 km
south of Darwin,
at the co-ordinates 638
768
(Tipperary 1:100 000 sheet 5170).
It is accessible by
a gravel road throughout the year.
preliminary hydrogeological study, interpretation of
the aerial photographs, hydrochemical study and other
relevant studies of the area resulted in selection of
the site for drilling.
The site was pegged in the
field with the approval of the Conservation Commission
during the hydrogeological reconnaisance.
The work ,'laS carried out in August 1986 on behalf of
the Conservation COlmr.ission of the Northern Territory
and involved preliminary investigation, construction
and testing of the production bore.
The Douglas Hot Springs lies in monsoonal climate with
wet season bet,,;een November and April.
The average
annual rainfall is about 1900 mm.
2. HYDROGEOLOGY
The area is located in the northern part of the Daly
River Basin.
It is covered by the Cambrian Tindall Limestone
underlain by the Tolmer Group of Middle Proterozoic
age.
The Tindall Limestone consists of massive thinly
bedded limestone with chert bands and nodules.
The
Tolmer Group is mainly composed of pink to brm~n medium
to coarse quartz sandstone, laminated to thinly bedded
very
fine
brown
quartzite
and
micaceous
sandy
siltstone.
One site was selected for drilling on the basis of the
information
obtained
from
previous
investigation
drilling (Reference 2). The aquifer was encountered in
the fractured quartzite between 37.0 m and 38.0 m. The
bore was flowing (1.9 Lis) with a pressure head of 40.5
kPa and the standing water level was 4.13 m above the
ground level.
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Technical Report WRD87041
3. WATER QUALITY
Water samples were collected during the test pumping.
The chemical analysis of the water was carried out by
the East Point Laboratory of Water Resources Division,
Darwin.
The results are given in Table 1.
The water
quality is within the recommended limit for drinking
,vater as adopted by the Australian Water Resources
Council/National Health and Medical Research Council
except for pH, which can be adjusted to an acceptable
level with suitable treatment.
4. WATERbEMAND
Water demand for this area is about 50 m3 /day and this
could be met with this bore, which has a water supply
of 345 m'!day.
5. RESULTS
Bore 24557 was constructed with fibreglass casing and
stainless steel screens.
An eight hour constant discharge test and a recovery
test were conducted.
The maximm!l cont.inuous pumping
rate is 4.0 Lis with the pump set at 33.0 m below
ground level as shown in Test Report - Bore 24557.
6. REC()MMENDAtlONS
It is recommended that:
the pump setting should be 33.0 m below the ground
level for a pumping rate of 4.0 L!s .
the pump setting should be 20.0 m below the ground
level for a pumping rate of 3.0 Lis.
special fittings
should be used
corrosiveness effects of this water.
due
to
the
no absorption trenches and septic tanks should be
constructed within 100 m radius of the bore.
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Page 6 of 12.
Technical Report WRD87041
REFERENCES
1.
AUSTRALIAN WATER RESOURCES COUNCIL/NATTONAL HEALTH
AND MEDICAL RESEARCH COUNCIL - Desirable Quality
for Drink.ing Water
in Australia.
Australian
Government Publishing Service, Canberra, 1980.
2.
P.
(1984)
DouglasiDaly
Groundwater
Resource Investigations 1981-1983
Department of
Mines and Energy, Water Resources Division, Report
No. 8/1984.
JOLLY,
111:HYGEO
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Page 7 of 12.
GROUNDWATgR QUALITY
.
:<:
~!
~~
•
~
•
~
§
-
('l
£',
•
I.
I ~ I ~~
~
.
24557
Technical Report WRD87041
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'I'ABLE 1
1
2
2
.- .-..- . -
4
1--..
~
~
;
M
~~
20
21
§
&:
~
~
~
....Ul
~
O.
.
•
~
""• 5(3
~S
.•
~
&2
,
u~
Sa
~~
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Ul
~
tl
~
I I I ~~ :a ~ ~ i~ U I
25
5
2
t)'
~
@""
d
0
li1
-
1
0.1
24
8
55
5.6
. -.-
0
55
2/11/ 6 Temp 48.4 C
0
--_.- -.-
_
.. .. -
.
._-- -_.._.- .._--- ..
_. -_.
---
-.~
..
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. _ . - ..-.-.' .-.
-- -_.. _
.
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.
..
'0'
.
.--.-.. r'
-----
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.
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-
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.
..
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-.-
.
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.
0 _ _ _ ••
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.
Page 8 of 12.
Analysis in milligrams lEr litre . ITq/L (unless otherwise st.ated)
,
Technical Report WRD87041
DEPARTMENT OF MINES AND ENERGY
WATER RESOURCES DIVISION
PUMPING PERFORMANCE CURVE
THIS DIAGRAM SHOWS THE EXPECTED DECLINE OF GROUNDWATER LEVEL AT VARIOUS
PUMPING RATES (a). IT PROVIDES A GUIDE TO SELECTION OF PUMP SETTING.
STANDING WATER LEVEL
4.13m ABOVE GROUND
22/11186
1
DAY
0
TIME
1
MONTH
6
3
MONTHS MONTHS
I
,I,
1
2
YEAR
YEARS
I-
10= 2.SUs
Ho
10
0=3.0Us
....E
....
20
20
0=4.0Us
..l
w
>
W
..l
0:
-30
30-
W
l-
O"S.IUs
<
:::
<!'
3:
o.
Z
~
OO
:::
0
..l
W
m
z
0"5'.?lLIS
r-
50-
I
-
..:
-
0
40
-
eo-
0:
-
1- 60
,
I-
I
PUMPING PERFORMANCE - BORE
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1- 50
I-
-
I
-
.0-
:::0
0
~
I
rf-
If-
24557
Page 9 of 12.
Technical Report WRD87041
DEPARTMENT OF MINES AND ENERGY
WATER RESOURCES DIVISION
,'-, 'TH
'(m)
0
[;
-
t--
I-
1- ....;
,":' ~
CLAY, grey
0>
j
,
AQUIFERS
(WATER ST 1-Il":K\
a;
Ji
(art•• ian)
22'11'81
IVv" 0.5 Us
'"
f-
E
CLAY, brown and CHERT
0
.,.
If-
yellow and some QUARTZ
E
-
'"
i?
1-0
,
.. .." SAND'
<:>
,
"
u
10
t; r',
- I.:'
-
D~~'"
S.W.L. 4.13m
above ground
,/
.,
IO-
STRATA
. "v,,"
GRAPHIC
BORE
CONSTRUCTION
LOG
-,
-
"
I::':
I-
,
'"I
:'"..
-
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i
ri'i:";
I',:
,Q
E
E
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;
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H.
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30 -
0
I-20
II-
~
10
"~
0>
....
..
.....
~
'"" ·....
.£l
••
~
,. ·•......
•• ..
..
~
....
~
..
V ·•........
~olf ......
,0,
I-
• •• QUARTZITE, red, white and some SHALE;
graen, grey
;c'/
:'I~'~"
I":
,.,- :: •.-_.
,- . •• .
,.: •...,
•• •
••
•.. .,
·•••
....
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• ·
,.,.f· ~ ·....••
f· . ..
• :..
..•·:::
..
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• ..
,
<II
~
20-
-
LIMESTONE ; whit •• fed, and CLAY, brown
g
'ijj
Ji
I-
• ••
•
I- 30
•
'-
1
-
0
"~
~
E
o
• : :, QUARTZITE .. red
'
•
•
'
I
-
IVv"
-
'
•
•
.
IVv" 3,5 U •
1 su.
IVv"
• • leel T
<10
40
COMPOSITE LOG OF BORE
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I-
24557
Page 10 of 12.
Technical Report WRD87041
WATER RESOURCES DIVISION
TEST REPORT Bore location:
Douglas Hot Springs
Reserve
Map: TIPPERARY
Grid reference:. 639
BORE RN.
24557
Client/owner: Conservation Commission
Client's reference:
Purpose of supply: Domes tic
1:100 000 Sheet 5170
-
770
RECOMMENDATIONS
Pumping rate:
4.0 Us. Pump setting:
33.0
m below ground level
General recommendations are given on the reverse side.
The aquifer and bore ::carncannot sustain higher pumping rates with deeper pump settings or for short
periods in favourable seasons. Further advice can be obtained from: Water Resources Di v
Sasco House, DAR>VIN
(In all correspondence refer to the bore's RN number).
BORE DATA
Finished depth: 38.5 m Completion date: 4/8/86
Standing water lev~l. 4.13 m on 22/11/86
Construction details. Above ground level
Test date: 22/11/86
Test rates: 5.2
Test duration
8
Us
hrs
Description
Interval (m)
o a -
AQUIFER TEST
203 mm ID Blank Steel Surface Casing
152 mm ID Blank Fibreglass Casing
152 mm ID Stainless Steel Screens with
0.63 mm slots
25,00
36.00
36.00- 38.50
Notes: 1. Top of casing as ccnstructed was O. 38. m above ground
2. All depths are measured from natural ground level
3. Test rates are not indicative of safe long term pumping rates.
WARNING: MINIMUM INTERNAL BORE DIAMETER IS
152
mm
COMMENTS
1.
Recommended pumping rate is based on a constant rate test at
5.2 L/S for a period of 8 hours and assumes that hydrological
conditions remain constant.
2.
I f this bore is equiped, water temperature i.e. 4SoC should be
considered as this can affect pumping equipment.
3.
This bore is flowing at 1.9 L/s with a pressure head of 40.5 };:P
i.e. static water level is 4.13 metres above ground level.
4.
Provision to obtain water samples at the bore head should be
incorporated in any reticulation.
5.
For pumping rate of 3 L/s pump may be set at 20 metres.
\~--------------------------------------------------------------~/
WATER QUALITY
See water laboratory report (Analysis No.
WRD4020
By:
J
86/87/0928
Rykiert 19/12/86
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Technical Report WRD87041
RE'COMMENDATIONS FOR FINISHING, OPERATING AND
PROTECTING GROUNDWATER BORES
Attention to the following points will ensure a long and safe life for the bore supply and help prevent pollution of the
groundwater resource.
1. Construct a concrete apron around the bore head to prevent surface flow, seepage and waste from entering the
bore.
2. Seal the space between the casing and pump equipment to prevent entry of vermin, dirt and pollutants.
3. Maintain pumping equipment in good order to prevent pollution. Prevent spillage of fuel and oil on the ground
around the bore. Store fertilizer and other chemicals at least 50 m away.
4. Keep stock away from the bore head. Discourage domestic activity at the bore. The first tap on the pipeline
should not be less than 5 m from the bore head.
5. Pumping the bore at higher than recommended rates may fork the bore leading to instability or pump
maintenance problems. Seek the professional advice of an hydrogeologist or groundwater engineer.
6. If the bore is no longer required, the casing is to be removed or securely capped and the bore backfilled with
clayey material. A cement plug may be required in some instances.
In addition, please ensure thai the BORE IDENTIFICATION TAG is retained securely at all times. The registered
bore number is Water Resources Division's only reference to the scientific and engineering data on this bore, and
hence important to WRD's further advice to bore owners.
BORE LOCATION MAP
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