CENTURY LINKSFIELD DEVELOPMENT - Bulk Services Report - Nali Sustainability ...
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CENTURY LINKSFIELD DEVELOPMENT
Bulk Services Report
2013/01/30
Confidentiality: Confidential
Quality Management
Issue/revision Issue 1 Revision 1 Revision 2 Revision 3
Remarks
Date
Prepared by A de Klerk
Signature
Checked by H Schreurs
Signature
Authorised by
Signature
Project number 16013
Report number
File reference
Project number: 16013
Dated: 2013/01/30 2
Revised:
Century Linksfield Development
Bulk Services Report
2013/01/30
Client
Consultant
Anton de Klerk
34 Bouvardia Avenue
Lynnwood Ridge
Pretoria
0081
South Africa
Tel: +27 12 762 1216
Fax: +27 12 762 1301
www.wspgroup.co.za
Registered Address
WSP SA Civil and Structural Engineers (Pty) Ltd
34 Bouvardia Avenue
Lynnwood Ridge
Pretoria
0081
South Africa
Tel: +27 12 762 1216
Fax: +27 12 762 1301
www.wspgroup.co.za
3
Table of Contents 1 Executive Summary ..................................................................... 5 2 Site Description ............................................................................ 6 3 Bulk Services ............................................................................... 9 3.1 Water Reticulation ................................................................... 10 3.1.1 Water Demand ..................................................................... 10 3.1.2 Proposed water transfer infrastructure ................................. 10 3.2 Sewer Reticulation .................................................................. 12 3.2.1 Sewer generation ................................................................. 12 3.2.2 Existing sewage ................................................................... 12 3.2.3 Proposed sewage infrastructure ........................................... 12 3.3 Stormwater .............................................................................. 12 3.3.1 Attenuation in Jukskei River ................................................. 13 3.3.2 Segregated on-site attenuation ............................................ 14 4 Conclusion ................................................................................. 15 5 Appendix A ................................................................................. 16 6 Appendix B ................................................................................. 17 Project number: 16013 Dated: 2013/01/30 4 Revised:
1 Executive Summary
Century Property Developments plans to develop 193 ha located along the N3 freeway in Johannesburg, in
Linksfield. The site is located west of the N3 freeway between Linksfield (M16) interchange and the
Modderfontein (R25) interchange. The Linksfield development water utilisation will have an impact on existing
bulk infrastructure systems. In order to quantify this impact GLS Consulting was approached for technical
advice. The potable water infrastructure system requires an upgrade and new infrastructure i.e.
■ Construction of new transfer infrastructure: (Refer to drawing SKC004, Appendix A)
Water supply the Linksfield development (as well as adjacent Huddle Park development) through a new
600 mm pipe (Item LRR1.1) and PRV (Item LRR1.2), to be connected to the existing 750 mm Ø pipeline
running from the Linksfield Reservoir. The required length of the new pipeline section is approximately 2020
m.
■ Expansion of existing infrastructure capacities: (Refer to drawing SKC004, Appendix A)
The 750 mm Ø pipeline from the Linksfiled reservoir has capacity to accommodate both the Linksfield and
Huddle Park developments, but it is recommended that it be replaced with a 1000 mm Ø pipeline (Item LRR2.1)
in the near future as velocities will ultimately exceed 3 m/s and due to the fact that is has a limited remaining
useful life. The required length of pipeline upgrade is approximately 970 m.
The sewage system is currently undergoing upgrades and would have enough capacity to accommodate allow
the Linksfield Development sewage.
5
2 Site Description
Century Property Developments plans to develop 193 ha located along the N3 freeway in Johannesburg, in
Linksfield. The site is located west of the N3 freeway between Linksfield (M16) interchange and the
Modderfontein (R25) interchange. The site location is indicated in Figure 1 and Figure 2.
Figure 1 : Linksfied development location within wider Johannesburg
Project number: 16013
Dated: 2013/01/30 6
Revised:Figure 2 : Linksfield development location
2
The proposed development aims to provide 8000 residential bond units and space for retail (150 000 m ),
2 2 2
offices (300 000 m ), light industrial (300 000 m ) and hotel and conference facilities (50 000 m ). The expected
zoning layout of the proposed development is reflect in Figure 3 and Figure 4.
7Figure 3 : Proposed site zoning areas Site topography is characterised by moderately steep gradients that slope towards the Jukskei River. The Jukskei river routes from the south-eastern side to the northern side at an average gradient of 2.1%. The site topography is characterised by relatively steep gradient sloping towards the Jukskei river. Project number: 16013 Dated: 2013/01/30 8 Revised:
Figure 4 : Linksfield development site layout
3 Bulk Services
The Linksfield development water utilisation will have an impact on existing bulk infrastructure systems. In order
to quantify this impact GLS Consulting was approached for technical advice. In the subsequent assessment,
GLS applied up to date geographic information, current system capacities and bulk service master planning.
Sewage master planning that were pertinent to the proposed development are the Bruma Sewer Network
Analysis Report in October 2008 (Report No. JWAT-C-0155-00-01-2008) by CES Consulting. Applicable
potable water infrastructure master planning are;
■ Modderhill & Chloorkop Water Districts (Report No. JWAT-C-141-00-01-1208), December 2008.
■ Parktown 1/Linksfield Water Sub-districts (Reports No. JWAT-C-0184-00-01-0810), August 2010.
■ Randjeslaagte Water Sub-District (Report No. JWAT-C-0185-00-01-0610), June 2012.
9Demand assessments and bulk service implications are as follows;
3.1 Water Reticulation
3.1.1 Water Demand
Water demand is predicted by using water demand rates recommended by Johannesburg Water (JW). The
3
average daily water demand for the full development is projected at 9900 m /d. The instantaneous demand
however is recommended to be four times higher (peak factor of 4) than the daily average would advocate. The
instantaneous demand, therefore translates to 458 l/s. The instantaneous demand is a key parameter in the
hydraulic assessment of the development’s impact on existing water transfer infrastructure.
3.1.2 Proposed water transfer infrastructure
The findings the GLS’s assessment is reflected in upgrades and expansions to the current water transfer
system. The proposals are indicated on drawing SKC004 and SKC 005, attached in Appendix A, and
summarized as follows;
■ Construction of new transfer infrastructure:
Water supply the Linksfield development (as well as adjacent Huddle Park development) through a new
600 mm pipe (Item LRR1.1) and PRV (Item LRR1.2), to be connected to the existing 750 mm Ø pipeline
running from the Linksfield Reservoir. The pipeline will run parallel to and to the northen side of Club Street
(M16) between Grand Road and a point approximately 225 m measured along Club street from the intersection
with Linksfield Road. The length of the new pipeline section is approximately 2030 m. A drawing that reflects
the location of the proposed water main is shown in Figure 5.
Project number: 16013
Dated: 2013/01/30 10
Revised:Figure 5 : Linksfield development proposed water main location
■ Expansion of existing infrastructure capacities:
The 750 mm Ø pipeline from the Linksfiled reservoir has capacity to accommodate both the Linksfield and
Huddle Park developments, but it is recommended that it be replaced with a 1000 mm Ø pipeline (Item LRR2.1)
in the near future as velocities will ultimately exceed 3 m/s and due to the fact that is has a limited remaining
useful life. The required length of pipeline upgrade is approximately 970 m.
■ Future system reconfigurations
The high-lying portion of the Linksfield development and the existing Edenvale General Hospital should in
future be supplied via the West of N3 direct feed system, with the rest of the consumers currently supplied via
this direct feed system then being supplied via the proposed Linksfield bulk system.
Furthermore, the pipe diameters of the existing West of N3 direct feed system needs to be confirmed on site.
113.2 Sewer Reticulation
3.2.1 Sewer generation
An assessment of the average peak daily dry weather sewer flow for the proposed development was done by
GLS consulting. The estimate is based on sewer production rates as prescribed by JW, and is estimated at
3
6930 m /d.
3.2.2 Existing sewage
The existing sewage system in and around the links field Development are indicated on drawing SKC003 ,
attached in Appendix B. The Bruma Outfall has limited spare capacity available to accommodate the proposed
Linksfield Development seweage, but capacity will be sufficient once the diversion of the Illiondale pump station
to the Modderfontein outfall has been completed. The construction is in progress.
3.2.3 Proposed sewage infrastructure
Four sewer connections (labelled A,B,C and D) to the Bruma Outfall are proposed to serve the Linksfield
development as indicated on SKC003 , attached in Appendix B;
3.3 Stormwater
Stormwater has a significant influence on site development methodology. Run-off volumes will increase and
accumulate at a quicker rate. The natural drainage system (i.e. Juksie River) will have to transfer faster arriving
additional stormwater. In order to offset the potential unfavourable impact of post development the change in
development hydrology, stormwater attenuation is essential.
Two strategies have been identified;
■ Attenuation of accumulated stormwater in the Jukskei River;
■ Attenuation of stormwater before draining into the Jukskei River i.e. segregated on-site attenuation.
Both the strategies will have the same effect, i.e. ensuring that the downstream post development hydrograph
is unaltered. This suggests that pre-development and post-development run-off volume and stormwater
accumulation rate is unaltered.
Project number: 16013
Dated: 2013/01/30 12
Revised:3.3.1 Attenuation in Jukskei River
The difference in pre-development and post-development stormwater volumetric flow rate requires attenuation.
A practical methodology is detention with engineered release of confined stormwater. Implementation of this
methodology can take the form of a retaining structure within the Jukskei River, as reflected in Figure 6. The
retaining structure will typically be integrated with the roadway bridging structure with engineered outlets to
ensure a pre-development hydrograph. The result will be marginal widening of the floodline during design storm
occurrence.
Possible retaining
structure
Figure 6 : Detention of the Jukskei River
The proposes detention facility will only be utilised during design storm occurrence. The flood plain can
therefore be utilised for biodiversity establishment, reinstatement of the Jukskei River ecology and inventive
recreational facilities. This can only contribute to the ecological well-being of the Linksfield area and broader
Johannesburg.
133.3.2 Segregated on-site attenuation
3
A requirement of for on-site detention is 350 m of detention per hectare of development. The proposed
3
development is 194 ha, and would therefore result in 67900 m of detention facilities, or water retaining
systems. Attenuation will take the form of seven separate water retaining facilities on development. Each facility
will detain a fraction of the run-off, and ultimately being transferred to the Jukskei River. The division of the
detention into separate smaller fractions may result in less potential ecological benefits.
Project number: 16013
Dated: 2013/01/30 14
Revised:4 Conclusion
Century Property Developments plans to develop 193 ha located along the N3 freeway in Johannesburg, in
Linksfield. The site is located west of the N3 freeway between Linksfield (M16) interchange and the
Modderfontein (R25) interchange. The Linksfield development water utilisation will have an impact on existing
bulk infrastructure systems. In order to quantify this impact GLS Consulting was approached for technical
advice. The potable water infrastructure system requires an upgrade and new infrastructure and the existing
sewerage has capacity to accommodate the development sewer.
155 Appendix A Project number: 16013 Dated: 2013/01/30 16 Revised:
C COPYRIGHT RESERVED
The contents of this document is both priviledged and confidential and may not be
disclosed or reproduced without the express authorisation of the author, being
"WSP SA CIVIL AND STRUCTURAL ENGINEERS (PTY) LTD"
EDENVALE GENERAL If drawing status = construction, a signed copy of this drawing is available in the
HOSPITAL WSP Pretoria Office (original or A3 size).
WEST OF N3 (RIETFONTEIN) DIRECT
(FROM MODDERHILL RESERVOIR VIA
EMM SYSTEM)
HOUSING
NATIONAL HEALTH COMPLEX
LABORATORY SERVICE
LRR1.7
CLOSED
L
VALVE HIL
ER IR
DD O
MO SERV
RE
x2
TE
ESLAAG
RANDJI RW 1617 (NORTH
ULK S UPPLY EAST AREAS)
B
SILVAMONTE
LINKSFIELD RESERVOIR LINKSFIELD PRV
(Proposed Linksfield Development)
WEST OF N3
CECI
LIA
LRR1.6
(RIETFONTEIN)
CLOSED
VALVE
MARAIS STEYN
PARK
PA
R
K
x1
SISWE TROPICAL
PARKTOWN 1 / DISEASE HOSPITAL
S
ES
LINKSFIELD
C
AC
E
G
R
EO
G
RESERVOIRS
LEGEND
FAIRVALE EXT2
RANDJIESLAAGTE RESERVOIR
EXISTING SYSTEM
RESERVOIR
MA
RG
AR
N
ET
TO
ING
RO
SE
LL
WE
RAND WATER BULK SUPPLY
T
GH
AU
NN
CO
RW CONNECTION
CROSS BOUNDARY CONNECTION
LRR1.5
LINKSFIELD
FCV AND SETTING (L/S) PRV2
(30m)
PROPOSED SYSTEM
PROPOSED CONNECTION POINT
SANDRINGHAM POINT C
PRV AND SETTING (m)
LRR1.1
FUTURE CLOSED VALVE DOWERGLEN 7&8 DIRECT
DOWERGLEN
EXT.10
PROPOSED UPGRADE DOWERGLEN
EXT.7
DOWERGLEN
LINKSFIELD 7 & 10
DOWERGLEN
FUTURE MAIN
SANDRINGHAM EXT.3
7 & 10 (WOOLWORTHS)
(GARAGE)
BU
CL
CLIENT: PROJECT: SCALE : CHECKED: APPROVED:
1:10000 H SCHREURS H SCHREURS
LINKSFIELD DEVELOPMENT DESIGN: DRAWN: DATE:
A BOTHA A BOTHA 2011/07/29
- TITLE:
PROJECT No: DRAWING No: REV:
A - - INITIAL ISSUE - - WSP SA Civil and Structural Engineers (Pty) Ltd
REV DATE BY DESCRIPTION CHK APD 34 Bouvardia Avenue, Lynnwood Ridge, Pretoria, 0081 EXISTING AND PROPOSED SEWER NETWORK SHEET 2 16013 SKC005 A
PostNet Suite 287, Private Bag X025, Lynnwood Ridge, 0040
DRAWING STATUS:
FOR INFORMATION
Tel: +27(0)12-361-4141 Fax: +27(0)12-361-4142 OF 2 c WSP Group plc
www.wspgroup.comC COPYRIGHT RESERVED
The contents of this document is both priviledged and confidential and may not be
disclosed or reproduced without the express authorisation of the author, being
"WSP SA CIVIL AND STRUCTURAL ENGINEERS (PTY) LTD"
UB
If drawing status = construction, a signed copy of this drawing is available in the
WSP Pretoria Office (original or A3 size).
CL
SANDRINGHAM EXT.2
RAND
BULK S
DON
WATER
NIE
UPPLY
LRR1.4
PRV POINT B
(30m)
.1
R1
LR
PARKTOWN 1 /
LINKSFIELD
RESERVOIRS
LINKSFIELD NORTH
LEGEND
.1
R1 EXISTING SYSTEM
LRR1.2 LR
LINKSFIELD
PRV1 RESERVOIR
(50m)
POINT A
RAND WATER BULK SUPPLY
RW CONNECTION
LINKFIELD EXT.3
CROSS BOUNDARY CONNECTION
FCV AND SETTING (L/S)
LR
R
2.
LINKFIELD NORTH EXT.1
1
PROPOSED SYSTEM
PROPOSED CONNECTION POINT
PRV AND SETTING (m)
LINKSFIELD
RESERVOIR FUTURE CLOSED VALVE
38500kl
TWL 1747.92 2.1 BEDFORTVIEW NO 2 PROPOSED UPGRADE
LRR BEDFORTVIEW NO 1
BWL 1742.73
FCV (414 l/s) FUTURE MAIN
RW 2014 (LINKSFIELD
RIDGE RESERVOIR)
CLIENT: PROJECT: SCALE : CHECKED: APPROVED:
0.106614 H SCHREURS H SCHREURS
LINKSFIELD DEVELOPMENT DESIGN: DRAWN: DATE:
A BOTHA A BOTHA 2011/07/29
- TITLE:
PROJECT No: DRAWING No: REV:
A - - INITIAL ISSUE - - WSP SA Civil and Structural Engineers (Pty) Ltd
REV DATE BY DESCRIPTION CHK APD 34 Bouvardia Avenue, Lynnwood Ridge, Pretoria, 0081 EXISTING AND PROPOSED SEWER NETWORK SHEET 1 16013 SKC004 A
PostNet Suite 287, Private Bag X025, Lynnwood Ridge, 0040
DRAWING STATUS:
FOR INFORMATION
Tel: +27(0)12-361-4141 Fax: +27(0)12-361-4142 OF 2 c WSP Group plc
www.wspgroup.com6 Appendix B
17BRU
1828 NEL
CHA
C COPYRIGHT RESERVED
MA O
EDENVALE GENERAL The contents of this document is both priviledged and confidential and may not be
X 76
N
HOSPITAL disclosed or reproduced without the express authorisation of the author, being
UTF
"WSP SA CIVIL AND STRUCTURAL ENGINEERS (PTY) LTD"
2
If drawing status = construction, a signed copy of this drawing is available in the
ALL
WSP Pretoria Office (original or A3 size).
HOUSING
NATIONAL HEALTH COMPLEX
LABORATORY SERVICE
WEST OF N3 (RIETFONTEIN) DIRECT
(FROM MODDERHILL RESERVOIR VIA
EMM SYSTEM)
X 762 POINT D
1828
NEL
CHAN
BRU
POINT B
182 NNEL
MA
CHA
8X
OUT
762
FAL
POINT A
L
SILVAMONTE
CECI
LIA
POINT C MARAIS STEYN
PARK
PA
R
K
SISWE TROPICAL
E
AC
C
ES
S
DISEASE HOSPITAL
G
R
EO
G
FAIRVALE EXT2
MA
RG
AR
N
ET
TO
ING
RO
SE
LL
WE
T
GH
AU
NN
CO
BRUMA OUTFALL
SANDRINGHAM
DOWERGLEN
EXT.10
DOWERGLEN
EXT.7
LINKSFIELD
SANDRINGHAM EXT.3
UB
CL
CLIENT: PROJECT: SCALE : CHECKED: APPROVED:
1:10000 H SCHREURS H SCHREURS
LINKSFIELD DEVELOPMENT DESIGN: DRAWN: DATE:
A BOTHA A BOTHA 2011/07/29
- TITLE:
PROJECT No: DRAWING No: REV:
A 2013-11-04 AB INITIAL ISSUE HS HS WSP SA Civil and Structural Engineers (Pty) Ltd
REV DATE BY DESCRIPTION CHK APD 34 Bouvardia Avenue, Lynnwood Ridge, Pretoria, 0081 16013 SKC003 A
DRAWING STATUS:
PostNet Suite 287, Private Bag X025, Lynnwood Ridge, 0040
Tel: +27(0)12-361-4141 Fax: +27(0)12-361-4142
EXISTING SEWER NETWORK
FOR INFORMATION www.wspgroup.com c WSP Group plcProject number: 16013 Dated: 2013/01/30 18 Revised:
WSP SA Civil and Structural Engineers (Pty) Ltd 34 Bouvardia Avenue Lynnwood Ridge Pretoria 0081 South Africa Tel: +27 12 762 1216 Fax: +27 12 762 1301 www.wspgroup.co.za
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