LOGAN WATER ALLIANCE
EDENS LANDING HLZ PUMP STATION DETAILED PLANNING
TASK NUMBER: 90-11-96
JULY 2013
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 2 of 34 Rev: 1
Approval Register
Date
Project Manager Submitted
Planning & Project Management Team Review
Program Review
Controlled Document – Change Register
Revision Section
Changed Change Description Initial Date
A Draft Report JT/BR
B All Format draft report for Program Review SS 24/06/2013
C All Incorporate Program Review Comments JT 12/07/2013
1 All Final format SS 22/07/2013
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 3 of 34 Rev: 1
TABLE OF CONTENTS
EXECUTIVE SUMMARY ................................................................................................................................. 6
1. INTRODUCTION ................................................................................................................................. 9
1.1 Objectives ........................................................................................................................................ 9
1.2 Scope ............................................................................................................................................... 9
1.3 Business Drivers .............................................................................................................................. 9
1.4 Study Area ..................................................................................................................................... 10
2. PLANNING CONTEXT ...................................................................................................................... 11
2.1 Background .................................................................................................................................... 11
2.2 Previous Studies ............................................................................................................................ 11
3. METHODOLOGY .............................................................................................................................. 12
4. DATA SOURCES .............................................................................................................................. 13
5. ASSUMPTIONS ................................................................................................................................ 14
5.1 Population and Demand ................................................................................................................ 14
5.2 Desired Standards of Service (DSS) ............................................................................................. 14
5.3 Stakeholder Engagement .............................................................................................................. 15
5.4 Cost ................................................................................................................................................ 15
6. ELEVATED RESERVOIR ................................................................................................................. 16
6.1 Low Pressure Issues ..................................................................................................................... 16
6.2 High Pressure Issues ..................................................................................................................... 17
7. EXISTING EDENS LANDING HLZ PUMP STATION ....................................................................... 19
7.1 Existing pump characteristics ........................................................................................................ 19
7.2 Existing pump operation ................................................................................................................ 20
8. OPTIONS DEVELOPMENT .............................................................................................................. 21
8.1 Pump station upgrade options ....................................................................................................... 21
9. OPTIONS ANALYSIS ....................................................................................................................... 22
9.1 Do nothing / non-infrastructure option ........................................................................................... 22
9.2 Option 1 - Reticulation Booster / Elevated tank off line ................................................................. 22
9.3 Option 2 - Reticulation Booster / Elevated tank on line ................................................................. 23
10. OPTION EVALUATION ..................................................................................................................... 24
10.1 Cost Assessment ........................................................................................................................... 24
10.2 Risk ................................................................................................................................................ 24
10.3 Town Planning and Approvals ....................................................................................................... 24
10.4 Preferred Option ............................................................................................................................ 24
11. CONCLUSIONS ................................................................................................................................ 26
12. RECOMMENDATIONS ..................................................................................................................... 27
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 4 of 34 Rev: 1
13. CAPITAL WORKS PROGRAM IMPLICATIONS .............................................................................. 28
14. REFERENCES .................................................................................................................................. 29
FIGURES
Figure 1-1: Edens Landing HLZ ...................................................................................................................... 10
Figure 3-1: Project Methodology ..................................................................................................................... 12
Figure 6-1: Elevated Properties and Logger Locations ................................................................................... 16
Figure 6-2: Logger Data................................................................................................................................... 17
Figure 6-3: Revised Zone Boundaries ............................................................................................................. 18
Figure 7-1: Existing Edens Landing Pump Station .......................................................................................... 19
Figure 7-2: Existing Edens Landing Pump Curve ........................................................................................... 19
Figure 7-3: Flow and Pressure Data ................................................................................................................ 20
TABLES
Table 5-1: Existing HLZ Population and Demand Forecasts .......................................................................... 14
Table 5-2: Key LCC Stakeholders ................................................................................................................... 15
Table 5-3: First Principals Cost Methodology .................................................................................................. 15
Table 6-1: Revised HLZ Population and Demand Forecasts .......................................................................... 18
Table 9-1: Option 1 - Cost Evaluation ............................................................................................................. 22
Table 9-2: Option 2 - Cost Evaluation ............................................................................................................. 23
Table 10-1: Option Cost Assessment .............................................................................................................. 24
Table 10-2: Revised HLZ Demand Forecasts ................................................................................................. 25
Table 13-1: PIP Capital Works Program ......................................................................................................... 28
Table 13-2: Tentative Capital Works Program Item ........................................................................................ 28
APPENDICES
Appendix A Figures
Appendix B DSS
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 5 of 34 Rev: 1
ABBREVIATIONS
AD Average Day
AHD Australian Height Datum
BWL Bottom Water Level
DMA District Metered Area
DN Diameter Nominal
DSS Desired Standards of Service
EP Equivalent Persons
FF Fire Flow
GIS Geographic Information System
HDD Horizontal Directional Drilling
HLZ High Level Zone
IDM Infrastructure Demand Model
LCC Logan City Council
LWA Logan Water Alliance
mAHD Metres Australian Height Datum
MDMM Mean Day Maximum Month
MH Maximum Hour
PIP Priority Infrastructure Plan
VSD Variable Speed Drive
WSZ Water Supply Zone
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 6 of 34 Rev: 1
EXECUTIVE SUMMARY
The existing Edens Landing High Level Zone (HLZ) water pump station supplies water to the Edens Landing
elevated reservoir and direct supply, servicing approximately 2,200 people. The Logan East Priority
Infrastructure Plan (PIP) indicated that the existing pump station has insufficient capacity to meet both the
existing demand and expected growth within the area and was recommended for immediate upgrade.
The objective of this study was to undertake the detailed planning for the upgrade for the existing Edens
Landing HLZ pump station to align the HLZ with Logan City Council‘s (LCC) Desired Standards of Service
(DSS).
Initial hydraulic modelling indicated that the HLZ currently experiences low pressure issues (below 22 m)
around the immediate area of the reservoir as well as a high point along Gardner Rd. The HLZ also contains
properties that experience pressure above the maximum desired pressure (55 m) stipulated in the DSS in
the west of the existing zone.
In order to mitigate the low pressures, the operations team are currently running the reservoir between 65%
and 95%. This however, adds to the high pressure issues experienced in the low lying areas of the HLZ.
After investigation, and in conjunction with the Logan Water Alliance (LWA) Logan East Water Supply – DMA
and FF – Detailed Planning 90-11-92 project, it was found that the HLZ could be reduced to exclude the
properties experiencing high pressures. These properties can be serviced by the adjacent gravity network
which will form part of the DMA proposed under that investigation (DMA63). The DMA has been designed
with the inclusion of these properties to maintain DSS. Also, by decreasing the size of the HLZ, the
population (EP) and water demand also decreases, as do the pump and reservoir sizing requirements. The
table below displays the original and revised population and demand forecasts for the proposed HLZ.
Edens Landing HLZ Demand Forecast 2011 2016 2021 2026 2031 Ultimate (2061)
Original Population (EP) 2192 4572 4891 4951 5053 5729
Revised Population (EP) 1508 3765 4046 4106 4209 4758
Original Average Day (ML/d) 0.6 1.2 1.3 1.3 1.3 1.5
Revised Average Day (ML/d) 0.4 1.0 1.1 1.1 1.1 1.2
Option Developments
Two infrastructure options and a non-infrastructure option were evaluated to determine the augmentations
required to meet the LCC DSS.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 7 of 34 Rev: 1
Do nothing / non-infrastructure option
A hydraulic analysis of the Edens Landing HLZ system and field data has shown that the existing network
configuration (where the Edens Landing HLZ pump station supplies the elevated reservoir), will continue to
have both low and high pressure issues that do not meet the DSS requirements.
Option 1 - Reticulation Booster / Elevated tank off line
Option 1 considers taking the elevated reservoir off line, and reconfiguring the existing Edens Landing HLZ
pump station into a reticulation booster to directly supply the HLZ. The cost of this option is approximately
$251,517, and includes the installation of:
two variable speed drives (VSD)
diesel generator
switchboard upgrade
jacking pump / diaphragm tank
Option 2 - Reticulation Booster / Elevated tank on line
Option 2 considers retaining the elevated reservoir on line, and constructing a new dedicated reticulation
booster pump station to supply the elevated areas currently experiencing low pressures. The cost of this
option is approximately $495,517, and includes:
228 m of DN150 pipe
5 kW booster pump
Conclusions
This current study has demonstrated that:
a “do nothing” option is not viable because it does not remedy the low pressures (19 to 20 m) in
two elevated areas within the zone to meet the DSS requirements (22 m)
the current high level zone can be reduced in size to alleviate high pressure issues in the area
west of Gardner Road. The existing Waterford lots served by Edens Landing pumps can be
transferred to the existing gravity network serviced by Wuraga ground level storage.
under Option 1 (removing the elevated reservoir from use and reconfiguring the HLZ pump
station to operate as a reticulation booster), no further changes are required to the capacity of
the pump station until approx. 2026/2031 maintaining a duty/standby regime. This capacity can
service to the ultimate planning horizon in a duty/assist configuration, subject to the PIP growth
projections.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 8 of 34 Rev: 1
the capital cost for Option 1 of $215,517 is significantly lower than the cost for Option 2 of
$495,517 (retaining the current network configuration and creating a dedicated pump-boosted
zone for the two elevated areas)
there are no town planning or approvals considerations for either option
based on both cost and standards of service outcomes, Option one has been selected as the
preferred option
Recommendations
The Logan Water Alliance recommends that:
1. Logan City Council immediately revise the zone boundary for the Edens Landing high level zone
to transfer the low lying Waterford properties to the East of Gardiner Road to the adjacent gravity
network.
2. Logan City Council adopt an augmentation strategy to reconfigure the existing Edens Landing
HLZ pump station and take the elevated storage out of service (Option 1) at an estimated capital
cost $251,517. It is recommended that this work in added to the Capital Work Program for
2013/14.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 9 of 34 Rev: 1
1. INTRODUCTION
The existing Edens Landing High Level Zone (HLZ) water pump station supplies water to the Edens Landing
elevated reservoir and direct supply, which services approximately 2,200 people. The Logan East Priority
Infrastructure Plan (PIP) indicated that the existing pump station has insufficient capacity to meet both the
existing demand and expected growth within the area.
This detailed planning study examines the works required to augment the pump station to meet the Desired
Standards of Service (DSS).
1.1 Objectives
The objective of this study was to undertake the detailed planning for the Edens Landing HLZ pump station,
including:
pump performance requirements
approvals required for proposed works
preferred pumping arrangement in terms of minimising operational and maintenance costs
1.2 Scope
The scope of this detailed planning report includes the following activities:
review the previous planning for the study area
review and document the business drivers for the proposed works
assess a “do nothing” approach and non-infrastructure solutions
develop and assess options to meet the project objectives
select a preferred option to progress to preliminary design (if applicable)
develop unit rate cost estimates for the proposed works
1.3 Business Drivers
The business drivers for this project include growth and improvement.
Existing Deficiencies. The existing pump capacity fails to meet DSS and pressure issues are
experienced within the zone.
Growth. Growth is identified for the Edens Landing HLZ in accordance with the most recent
Infrastructure Demand Model (IDM).
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 10 of 34 Rev: 1
1.4 Study Area
The extents and location of the existing Edens Landing HLZ, pump station and elevated reservoir are shown
in Figure 1-1.
Figure 1-1: Edens Landing HLZ
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 11 of 34 Rev: 1
2. PLANNING CONTEXT
2.1 Background
The Logan East PIP identified that the Edens Landing HLZ pump station and reservoir do not meet the DSS
and are currently undersized. The upgrade works are tentatively included in Logan City Council’s (LCC)
capital works program as item W0094 with a value of $251,000. Further discussion on the status of this
upgrade is discussed in Section 13.
The Logan East Trunk Water Network Project Development report (90-11-29) identified a cost of
approximately $205,000 (pump replacement only) for undertaking this upgrade (PIP ID: LE_U5004.1) and
required for delivery in the 2013/14 financial year.
2.2 Previous Studies
The following previous planning studies were considered during this study:
Logan East PLMP and Fire Flow Scoping Report (LWA 2012)
Priority Infrastructure Plan: Water Planning Report - Logan East ( LWA 2011)
Summary Report - Logan East Proposed DMAs (Allconnex Water)
Logan East Water Network Detailed Planning Report (LWA 2012)
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 12 of 34 Rev: 1
3. METHODOLOGY
Figure 3-1 describes the methodology undertaken in this study. The project has been split into four phases,
with the tasks in each phase listed below.
Figure 3-1: Project Methodology
• Project familiarisation and review of background planning
• Review available drawings and operational information
• Meet with Logan Water staff to discuss issues and known constraints
Phase 1 - Project Appreciation
• Confirm project drivers and document business case
• Investigate both “do nothing” and “non-infrastructure” options
• Determine whether infrastrutcture options are required
Phase 2 - Project Justification
• Undertake a site visit to confirm site constraints / opportunities
• Develop preliminary infrastructure options
• Consider staging or deferring works where feasible
• Develop options for assessment
• Undertake hydraulic modelling to determine option outcomes
• Prepare cost estimates
• Review Town Planning, Environment, and Community issues
Phase 3 - Option Development and Assessment
• Undertake sensitivity analysis (if applicable)
• Identify preferred option
• Determine all approvals necessary for implementation of option
• Document investigation, findings and recommendations
Phase 4 - Recommendations and Requirements
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 13 of 34 Rev: 1
4. DATA SOURCES
The following data was used for this study:
population and water demands for Logan East were obtained from the 2010 IDM, Version 5 (LWA
Aug 2011). The methodology used to convert forecasts of residential and non-residential growth into
demand is outlined in the Priority Infrastructure Plan Infrastructure Demand Model Report (LWA Mar
2011).
site Inspections: Inspection of existing pump station
as-Constructed Information: As-Constructed drawings of existing infrastructure
GIS data: Logan City Council GIS Database
H20Map model: as prepared by the Logan Water Alliance for the Logan Water Development
Services team
previous Planning reports (outlined in Section 2.1)
Stakeholder Engagement was limited to discussions with Logan City Council departments, primarily the
Water Operations and Infrastructure Branches.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 14 of 34 Rev: 1
5. ASSUMPTIONS
5.1 Population and Demand
The water demand forecasts for the existing Edens Landing HLZ were obtained from the Priority
Infrastructure Plan: Water Planning Report - Logan East (LWA Aug 2011). The forecast population is
represented as an Equivalent Person (EP) and then converted to a projected water demand based on the
DSS average day demands for the supply area.
The projected population, and average day (AD) and maximum hour (MH) water demand forecasts for the
HLZ for each planning horizon are presented in Table 5-1.
Table 5-1: Existing HLZ Population and Demand Forecasts
Edens Landing HLZ Demand Forecast 2011 2016 2021 2026 2031 Ultimate (2061)
Population (EP) 2192 4572 4891 4951 5053 5729
AD (ML/d) 0.6 1.2 1.3 1.3 1.3 1.5
AD (L/s) 6.6 13.8 14.7 14.9 15.2 17.2
MH (L/s) 25.1 52.3 55.9 56.6 57.8 65.5
5.2 Desired Standards of Service (DSS)
The relevant DSS are included in Appendix C and were obtained from the Desired Standards of Service
Review (LWA Sep 2010). The most significant DSS water supply design criteria include:
Pumping capacity
o Pump servicing an elevated reservoir
(6MH - Operating Volume) / (6x3600)
o Reticulation Booster Pumps / Pumped System
MH+FF (fire flow)
o Standby pump capacity – to match duty, except where more than one pump or as
determined by risk assessment
Service Pressures
o Minimum operating pressure
22 m at property boundary
o Maximum operating pressure
80 m at property boundary
55 m – target maximum pressure
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 15 of 34 Rev: 1
5.3 Stakeholder Engagement
Table 5-2 summarises the key stakeholders that were consulted during this study.
Table 5-2: Key LCC Stakeholders
LCC Branch Name Position Level of Consultation
Water Operations Lester Bridgham Mechanical and Electrical Operations Supervisor
Presentation for discussion of options and recommendations, site visit
Water Operations Darshan Udayaratna Assistant Supervisor
Mechanical and Electrical Operations
Presentation for discussion of options and recommendations, site visit
Water Development Services
Marco Bonotto Water Development Services
Program Leader
Confirmation of population projections within the study area
based on latest development information
Water Infrastructure Planning
Sandy Veeren Water Infrastructure
Planning Program Leader Overall planning and capital works
5.4 Cost
As the unit rates do not provide good coverage on the items considered for this task, a first principles
approach was used for costing infrastructure requirements identified in this report. The values were obtained
from the Logan Water Alliance Design team and are detailed in Table 5-3.
Table 5-3: First Principals Cost Methodology
Augmentation Type Construction Size Cost /
Meter Start Up Contingency Total
Water Main PE 600mm Enveloper
HDD (horizontal directional
drilling)
<450 mm $2000
45% 30%
$3500
Trench <450 mm $1000 $1750
VSD
Water - 20 kW - - - $15,000
Generator Diesel - 130 kVA - - - $50,000
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 16 of 34 Rev: 1
6. ELEVATED RESERVOIR
The Logan East PIP planning report identified that the elevated reservoir currently servicing the Edens
Landing HLZ is undersized. The subsequent Logan East Water Network Planning (LWA 2012) report
recommended that the elevated reservoir not be upgraded, in favour of upgrading the existing pump station
by converting it into a booster pump station (to directly supply the Edens Landing HLZ and bypassing the
reservoir).
6.1 Low Pressure Issues
Hydraulic modelling indicated existing low pressure issues in the immediate area of the reservoir and at a
high point along Gardner Rd. Pressure loggers were installed by LCC Operations in the areas indicated by
the model to be experiencing low pressures, as noted in Figure 6-1.
Figure 6-1: Elevated Properties and Logger Locations
The data recorded by the pressure loggers confirmed the low pressures indicated by the model as
demonstrated in Figure 6-2.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 17 of 34 Rev: 1
Figure 6-2: Logger Data
The low pressures experienced in the elevated areas are primarily due to the physical configuration of the
reservoir. The bottom water level (BWL) of the elevated reservoir is 108 mAHD, with the ground level of the
elevated properties ranging between 88 mAHD and 92 mAHD. Although there is the potential for pressures
to drop to 16 m in the elevated area, the operation of the reservoir limits the minimum pressure to 19 m when
the pumps are not operating.
6.2 High Pressure Issues
6.2.1 High Pressure Properties
The western section of the Edens Landing HLZ experiences pressures that are close to or above the
maximum pressure of 80 m stipulated in the DSS. This is primarily due to a ledge that runs through the zone,
which has a sharp fall off to the western side to ground elevations of approximately 30 mAHD. Based on the
BWL of the elevated reservoir (108 m), the maximum pressure is likely to be around 78 m in low demand
periods; however, when the Edens Land HLZ pump station is operating, the maximum pressure is likely to
exceed 85 m.
A concurrent District Metered Area (DMA) detailed planning project for Logan East (Logan East Water
Supply – DMA and FF – Detailed Planning, Task 90-11-92) identified that the boundaries of the HLZ could
be altered to incorporate the western area currently experiencing high pressures into neighbouring DMAs.
Isolated areas in the east of the current HLZ are also able to be transferred to neighbouring supply zones.
The resulting decrease in the size of the zone will reduce the pump and reservoir requirements.
Figure 6-3 illustrates the proposed boundary changes.
18
19
20
21
22
23
24 0
0:0
0
01
:10
02
:20
03
:30
04
:40
05
:50
07
:00
08
:10
09
:20
10
:30
11
:40
12
:50
14
:00
15
:10
16
:20
17
:30
18
:40
19
:50
21
:00
22
:10
23
:20
Pre
ssu
re (
m)
WFH016530
WFH015536
DSS
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 18 of 34 Rev: 1
Figure 6-3: Revised Zone Boundaries
6.2.2 Revised Population Projection
The reduced HLZ boundary will be used for all options considered in this study, with the revised population
and demand data presented in Table 6-1.
Table 6-1: Revised HLZ Population and Demand Forecasts
Edens Landing HLZ Demand Forecast 2011 2016 2021 2026 2031 Ultimate (2061)
Population (EP) 1508 3765 4046 4106 4209 4758
AD (ML/d) 0.4 1.0 1.1 1.1 1.1 1.2
AD (L/s) 4.5 11.3 12.2 12.4 12.7 14.3
MH (L/s) 17.2 38.3 41.6 42.3 43.4 49.7
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 19 of 34 Rev: 1
7. EXISTING EDENS LANDING HLZ PUMP STATION
Figure 7-1: Existing Edens Landing Pump Station
7.1 Existing pump characteristics
Three water pump sets are currently installed at the Edens Landing pump station (Figure 7-1), a duty, a
standby pump for normal operation, and a diesel pump to maintain supply in the event of a power failure.
The existing pumps can deliver a range of flows from 15.3 to 47.5 L/s with a nominal design head of 50 m.
The pump curve for both a single pump and the two pumps combined are shown in Figure 7-2.
Figure 7-2: Existing Edens Landing Pump Curve
0
10
20
30
40
50
60
70
0 10 20 30 40 50 60 70 80 90 100
He
ad(m
)
Flow(L/s)
Flow_1 pump Flow_1 & 2 pump
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 20 of 34 Rev: 1
7.2 Existing pump operation
The operation of the existing pump station retrieved from the ClearSCADA system is presented in Figure 7-3.
Figure 7-3: Flow and Pressure Data
The information presented highlights the actions the LCC’s Operations team are taking to attempt to align
the HLZ with the DSS. The pumps are turning on at a higher rate, approximately 10 times a day, than would
be expected of a pump station supporting storage. This is due to the Operations team keeping the elevated
reservoir at a high level due to the BWL of the reservoir not being high enough to supply the minimum
required pressure (22 m) to the surrounding areas.
0
10
20
30
40
50
60
70
0
100
200
300
400
500
600
7000
0:0
0
01
:39
02
:30
05
:00
06
:00
07
:30
08
:30
09
:43
10
:20
11
:33
12
:30
13
:35
15
:00
16
:00
17
:27
18
:04
19
:25
20
:00
21
:39
22
:30
Flo
w (
L/s)
Pre
ssu
re (k
Pa)
Time
Pressure (kpa) Flow (L/s)
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 21 of 34 Rev: 1
8. OPTIONS DEVELOPMENT
8.1 Pump station upgrade options
A “do-nothing” (or non-infrastructure solution) as well as two infrastructure options were developed to ensure
that the Edens Landing HLZ can meet the DSS.
8.1.1 Do nothing / non-infrastructure option
An analysis of the Edens Landing hydraulic modelling and field data indicates that the existing pump station
and elevated reservoir (working as a pump servicing an elevated reservoir) cannot alleviate low pressure
issues within the zone due to the physical configuration of the reservoir. The pump station has sufficient
capacity to meet the demand for the Edens Landing HLZ until the 2031 planning horizon without any
changes or modification; however, the elevated reservoir is undersized, and does not meet the DSS for
storage requirements.
As the “do nothing” (or non-infrastructure) option does not strictly meet the DSS, it is not considered viable.
8.1.2 Option 1 - Reticulation Booster / Elevated tank off line
Option 1 considers taking the elevated reservoir off line, and reconfiguring the existing Edens Landing HLZ
pump station into a reticulation booster pump station. The low pressures in the zone are experienced when
the elevated reservoir is supplying the area. This is due to the BWL of the reservoir not being high enough to
service the properties in the two elevated areas. By taking the reservoir off line, the low pressures in the two
elevated areas can be nullified by using an increased pressure control for the pump station
Some key considerations for this option were:
The pump station reconfiguration to a reticulation booster will put increased strain on the pump
station. A risk assessment of the pumps and a jacking pump / diaphragm tank may be required.
Variable Speed Drives (VSD) will be required for the existing pumps to meet the range of flow
characteristics.
8.1.3 Option 2 - Reticulation Booster / Elevated tank on line
Option 2 retains the elevated reservoir and Edens Landing HLZ pump station in the current configuration,
with the two elevated areas to be serviced via a small dedicated booster pump station. This option requires
additional pipe work to create the elevated zone, as indicated in Figure 1 Appendix A.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 22 of 34 Rev: 1
9. OPTIONS ANALYSIS
This section discusses the options developed in this study. The options have been developed to ensure that
adequate levels of service are achieved based on the proposed growth in the study area, while maximising
the capacity and asset life of the existing infrastructure, and optimising any short-term augmentation works.
9.1 Do nothing / non-infrastructure option
A hydraulic analysis and field data for the Edens Landing HLZ system indicated that the existing pump
station and elevated reservoir will continue to create low pressure issues within the zone. This option has not
been considered any further.
9.2 Option 1 - Reticulation Booster / Elevated tank off line
Option 1 involves the conversion of the existing pump station into a reticulation booster to directly supply the
Edens Landing HLZ.
9.2.1 Costs
This option will require minor works to reconfigure the existing pump station to operate as a reticulation
booster. Both existing pumps will need to be retro-fitted with a variable speed drive (VSD). The diesel pump
will also need to be converted into a diesel generator to ensure continuous operation of the main pumps
during any loss of power.
A small jacking pump (with a diaphragm tank) will be required to pressurise the system when the flows are
too small for the existing pumps. The LWA design team was consulted to develop an appropriate cost. The
cost includes an allowance for upgrading of the switchboard (including telemetry) in the instance it is
required.
Table 9-1 details the cost for Option 1.
Table 9-1: Option 1 - Cost Evaluation
Infrastructure Cost per item Quantity Total cost
VSD Units $15,000 2 $30,000
Diesel Generator $50,000 1 $50,000
Jacking Pump / Diaphragm Tank
$96,517 1 $96,517
Switch Board Upgrade $75,000 1 $75,000
Total $251,517
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 23 of 34 Rev: 1
9.2.2 Risk
This option carries the risk of no storage, fire flow or otherwise. In the case of the primary pump requiring
repairs or failure, the standby pump can still operate. If power to the site fails, the diesel generator will power
either the duty or standby pump. The reconfiguration of the pumps from a pump serving an elevated
reservoir to a reticulation booster, will result in the pumps operating continuously at a range of speeds as
opposed to operating intermittently to fill the reservoir, and a detailed risk assessment should be carried out
to ensure appropriate risk mitigation measures are employed.
9.2.3 Town Planning and Approvals
The town planning and approvals team were not consulted for this option, as all infrastructure requirements
would be undertaken in the existing pump house.
9.3 Option 2 - Reticulation Booster / Elevated tank on line
Option 2 retains the elevated reservoir to service the majority of the current HLZ, with a small (5 kW)
reticulation booster pump station to supply the two elevated areas.
9.3.1 Costs
Some additional pipe work is required to create the new dedicated boosted area, as indicated in Appendix A.
Table 9-2 details the costs for Option 2.
Table 9-2: Option 2 - Cost Evaluation
Infrastructure Cost per item Quantity Total cost
Pipe (Trench) $1750 / m 228 m $399,000
Pump (5 kW) $96,517 1 $96,517
Total $495,517
9.3.2 Risk
Option 2 adds minimal risk to the existing pump arrangement. The small booster pump station servicing the
elevated areas will require additional operation controls in the case of a fire event and a bypass to allow fire
flows to be supplied from the reservoir
Although the elevated reservoir would not service the same number of properties, and therefore have a
reduced demand, it would still not meet the requirements stipulated in the DSS.
9.3.3 Town Planning and Approvals
Although this option requires the construction of approximately 228 m of water mains, the Town Planning
and Approvals teams were not consulted as all of the additional pipelines would be constructed in fully-
developed areas on previously-disturbed land.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 24 of 34 Rev: 1
10. OPTION EVALUATION
The required infrastructure associated with each option is assed in the following section against both cost
and non-cost criteria.
10.1 Cost Assessment
A first principles cost assessment was undertaken for each option based on the assumptions outlined in
Section 5. The assumed construction method is noted in the table, with ‘Trench’ referring to conventional
open trench construction.
Table 10-1 displays the costs associated with each option.
Table 10-1: Option Cost Assessment
Option Augmentation Description Cost Total Cost
1
2 x Pump VSD $30,000
$251,517
Generator Diesel $50,000
Pump Jacking Pump / Diaphragm Tank
$96,517
Switch Board Upgrade - $75,000
2
228 m of 150 mm Trench Pipe $399,000
$495,517
5 kW Pump Station $96,517
10.2 Risk
There are risks associated with both options; however, Option1 carries a higher risk due to the lack of
storage. In consultation with LCC Operations, the mitigation measures (installation of a diesel generator)
proposed are considered acceptable. Option 2 has a lower associated risk; however, the existing elevated
tower would still be undersized in Option 2, even with the reduced zone boundaries.
10.3 Town Planning and Approvals
No consideration was given to town planning or approvals for either option.
10.4 Preferred Option
10.4.1 Option Selection
The preferred option is primarily based on cost, with Option 1 approximately half the cost of Option 2.
Although the risk is marginally higher for Option 1, the risk mitigation measures and a risk assessment of the
pump station amounted to an acceptable level of risk.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 25 of 34 Rev: 1
10.4.2 Pump Assessment
The existing pumps converted to a booster pump station, set up in a duty / standby arrangement should,
according to the IDM, be able to supply the Edens Landing HLZ until approximately the 2026 / 2031 planning
horizon. After that point a duty assist arrangement for maximum hour and fire fighting flows may be required.
Table 10-2 below shows the duty points for each planning horizon, assuming development rolls out as per
the IDM.
Table 10-2: Revised HLZ Demand Forecasts
Edens Landing HLZ Demand Forecast
2011 2016 2021 2026 2031 Ultimate (2061)
MH (L/s) 17.2 38.3 41.6 42.3 43.4 49.7
Fire Fighting 30 30 30 30 30 30
Required Pump Head (m) 28 38 40 40 42 52
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 26 of 34 Rev: 1
11. CONCLUSIONS
This current study has demonstrated that:
a “do nothing” option is not viable because it does not remedy the low pressures (19 to 20 m) in
two elevated areas within the zone to meet the DSS requirements (22 m)
the current high level zone can be reduced in size to alleviate high pressure issues in the area
west of Gardner Road. The existing Waterford lots served by Edens Landing pumps can be
transferred to the existing gravity network serviced by Wuraga ground level storage.
under Option 1 (removing the elevated reservoir from use and reconfiguring the HLZ pump
station to operate as a reticulation booster), no further changes are required to the capacity of
the pump station until approx. 2026/2031 maintaining a duty/standby regime. This capacity can
service to the ultimate planning horizon in a duty/assist configuration, subject to the PIP growth
projections.
the capital cost for Option 1 of $215,517 is significantly lower than the cost for Option 2 of
$495,517 (retaining the current network configuration and creating a dedicated pump-boosted
zone for the two elevated areas)
there are no town planning or approvals considerations for either option
based on both cost and standards of service outcomes, Option one has been selected as the
preferred option
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 27 of 34 Rev: 1
12. RECOMMENDATIONS
The Logan Water Alliance recommends that:
3. Logan City Council immediately revise the zone boundary for the Edens Landing high level zone
to transfer the low lying Waterford properties to the East of Gardiner Road to the adjacent gravity
network.
4. Logan City Council adopt an augmentation strategy to reconfigure the existing Edens Landing
HLZ pump station and take the elevated storage out of service (Option 1) at an estimated capital
cost $251,517. It is recommended that this work in added to the Capital Work Program for
2013/14.
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 28 of 34 Rev: 1
13. CAPITAL WORKS PROGRAM IMPLICATIONS
The requirement to upgrade this pump station was initially identified in the master planning for Logan East
and documented in Priority Infrastructure Plan: Water Supply Planning Report– Logan East (LWA 2011). The
need was further verified as part of another project and documented in Logan East Trunk Water Network,
Project Development (LWA 2012), which recommended that detailed planning be undertaken.
Liaison with Logan City Council's Capital Program Development Coordinator during this project identified that
this works was not included in the current Capital Works Program. This has been tentatively added until such
time as a Project Brief has been approved by the Water Infrastructure Manager.
The item details originally provided as part of the master planning are presented in Table 13-1. The
implications of this detailed planning study on the value and scope currently reflected in the capital works
program are shown in Table 13-2.
Table 13-1: PIP Capital Works Program
PIP ID Project Name
Project Description Project Status
Total Project Cost
Year Implications of this Study
LE_U5004.1
Upgrade Edens Landing HLZ PS
An upgrade to the existing pump station of 27 kW pumping capacity
Master Planning
$205,671 2009 Refer to Table 13-2.
Table 13-2: Tentative Capital Works Program Item
CWP Ref.
Project Name Project Description Project Status
Total Project
Cost Year
W0094 Edens Landing HLZ Pump Station (WPS53) Upgrade
The objective of this project is to convert the existing pump station into a reticulation booster to directly supply the Edens Landing HLZ. The scope of works includes the installation of 2 x Variable Speed Drives (VSD) units, a diesel generator, jacking pump/diaphragm tank and the upgrade of the switchboards. Asset ID: WPS000037
Detailed Planning
$251,517 2013
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Page 29 of 34 Rev: 1
14. REFERENCES
Logan Water Alliance 2011, Priority Infrastructure Plan: Water Supply Planning Report – Logan East, (Task
90-10-57)
Logan Water Alliance 2012, Logan East Pressure and Leakage Management Program and Fire Flow
Scoping Report (Task 90-11-38)
Logan Water Alliance 2012, Logan East Trunk Water Network Project Development (Task 90-11-29)
Logan Water Alliance 2012, Logan East Water Supply – DMA and FF – Detailed Planning (Task 90-11-92)
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Rev: 1
Appendix A Figures
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Rev: 1
Appendix B DSS
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Rev: 1
WATER NETWORK DSS
Parameter Criteria
Water Demand
Average Day demand
On demand areas - 260 L/EP/d. Based on 230 L/EP/d + allowance for leakage/losses (30 L/EP/d).
Constant flow areas - 180 L/EP/d. Based on 130 L/EP/d + allowance for leakage/losses (50 L/EP/d).
Peaking factors MDMM/AD MD/AD MH/AD
Residential detached 1.4 1.7 3.8
Residential attached 1.3 1.6 3.1
Rural residential 1.4 1.7 CF services 70 L/hr/ET
Commercial 1.2 1.3 2.0
Industry 1.2 1.3 1.7
Parks / Open Space 1.2 1.3 1.7
System planning
Bulk supply and reticulation
3 days of MDMM. Reservoirs to have a net positive inflow and capable of continuous operation and not fall below the emergency level. 3 days of MD. Reservoirs should not fall below the emergency level. 5 days of AD. Reservoirs should fill from empty to full
Minimum service pressure
Minimum operating pressure at MH
On demand areas – 22m at the property boundary based on reservoir at minimum operating level (MOL). MOL defined as 15% of storage height or top of emergency storage
Constant flow areas – 10m at the property boundary based on reservoir at minimum operating level (MOL). MOL defined as 15% of storage height or top of emergency storage.
Maximum operating pressure 80 m at the boundary based on the reservoir at TWL
Target pressure 55 m at the property boundary based on the reservoir level at TWL
Fire fighting
System pressure
On demand areas – 12 m minimum at property boundary
Constant flow areas – no fire service provided
Fire flow Residential – 15l/s for 2hrs Commercial & Industrial – 30l/s for 4hrs Special risk / hazard to be advised by Allconnex Water
Background demand 2/3 MH (as per DERM requirements)
Reservoir level MOL
Number of fires <5000 EP – single fire for residential or industrial / commercial >5000 EP – simultaneous single residential fire plus single commercial / industrial fire for sizing trunk mains
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Rev: 1
WATER NETWORK DSS
Parameter Criteria
Reservoir storage
Ground level storage capacity
3 (MD - MDMM) + (Greater of emergency storage/fire fighting storage) Emergency Storage = the greater of 4hr MDMM demand in zone or 0.5ML whichever is greater. Where Fire Fighting Reserve is: > 4800EP:
CF services for rural residential 72kL (2 x 5L/s x 2hrs);
for industry, business 540kL (i.e. 30L/s x 4hrs + 15L/s x 2hrs) otherwise 210kL (2 x 15L/s x 2hrs).
< 4800 EP:
CF services 36kL (15L/s x 2 hrs); for business & industry 432kL (30L/s for 4hrs); otherwise 150kL (= 15L/s for > 2hrs).
Elevated storage capacity
6(MH - 1/12 MDMM) + minimum fire fighting reserve. Where fire fighting reserve is: > 4800EP:
CF services for rural residential 72kL (2 x 5L/s x 2hrs);
for industry, business 54 kL (i.e. 30L/s x 4hrs + 15L/s x 2hrs)
otherwise 210kL (2 x 15L/s x 2hrs). < 4800 EP:
CF services 36kL (15L/s x 2hrs);
for business & industry 432kL (30L/s for 4hrs);
otherwise 150kL (= 15L/s for > 2hrs).
Pumping capacity
Pump supplying a ground level reservoir
MDMM over 20hrs
Pump supplying an elevated reservoir
(6MH – operating volume) / (6 x 3600)
Standby pump capacity To match duty, except where more than one duty pump or as determined by risk assessment
Reticulation booster pumps/pumped system
MH + fire flow
Pipeline design
Main capacity
Raw water mains & trunk feeding ground level reservoir : MDMM for a gravity supply and MDMM over 20hrs for a pumped supply Trunk Mains feeding elevated reservoir: capacity of pumps Reticulation Mains: MH + fire flow
Mains size
Constant flow areas - where mains terminate in short runs such as cul de sacs minimum sizes that may be acceptable are: DN 63 up to 150m from main DN 80 up to 350m from main
On demand areas - minimum reticulation main 100mm in residential areas and 150mm in commercial and industrial areas
Friction default values
Hazen Williams Existing assets will use the below table to determine the C value.
Pipeline Type Pipeline Age
(All diameters) < 10 Years 10 to 25 Years > 25 Years
MSCL 150 140 130
DICL 140 130 120
DI 140 125 110
CICL 140 130 120
CI 140 125 110
UPVC 150 145 140
Asbestos Cement 140 130 120
Concrete 140 130 120
Edens Landing HLZ pump Station Detailed Planning
Document Number: 7600-000-P-REP-PL-8176
90-11-96 Date issued: 26/07/2013 Rev: 1
WATER NETWORK DSS
Parameter Criteria
New infrastructure will use the following more conservative C values due to uncertainty in material type at the master planning stages. Distribution: <300mm, C=110 300mm – 600mm, C=120 >600mm, C=125 Reticulation: <= 150mm, C=100 200mm - 300mm, C=110 >300mm, C=120
Maximum velocity 2.5 m/s
Water quality
Drinking water quality Drinking water to comply with the NHMRC Australian Drinking Water Guidelines – 2004.