Size: px
Start display at page:

Download ""

Transcription

1

2

3

4

5 o o o

6

7

8

9

10

11

12

13

14 Our reference: Your reference: Bretagna Estate - Electrical Bretagna Estate - Electrical Services Report 15 February 2018 Kabod Development Group (Pty) Ltd Postnet Suite #133 Private Bag X15 Somerset West 7140 For Attention: Me. Marthia Roos PROPOSED BRETAGNA ESTATE MIXED USE DEVELOPMENT ERF PAARL ELECTRICAL INFRASTRUCTURE SERVICES REPORT BACKGROUND AND TERMS OF REFERENCE The opportunity to develop the existing erf 26158, Paarl into a successful mixed use development as indicated in the study area has been identified by the Applicant. Mapule Consulting Cape cc has been instructed to investigate the electrical infrastructure capacity and requirements for the proposed development and this report relays our findings and recommendations. EXISTING ELECTRICAL INFRASTRUCTURE At present the existing farm house is connected to the Drakenstein Municipal electrical network via an 11kV overhead line terminating at the north east side of the erf (next to the R 310). A 315 kva, 11kV/400V transformer positioned next to the old farm shed is fed via underground 11kV cabling. The transformer feeds a low voltage council metering DB with a 500A, 3-phase circuit breaker feeding the existing pole mounted consumer DB. OFFICES AT: HEAD OFFICE P.O. Box PANORAMA 7506 Tel: Fax: cape@mapule.co.za 22 Fairfield Street South Fairfield Estate Parow 7500 SPRINGS P.O. Box 1300 SPRINGS 1560 Tel: Fax: christo@mapule.co.za PRETORIA P.O. Box 679 WAPADRAND PRETORIA 0050 Tel: Fax: martin@mapule.co.za Drakenstein Municipality confirmed that the existing connection to the erf is 315kVA. The above existing services are as per the attached drawing (See Annexure A). ELECTRICAL LOAD ESTIMATE The SANS 204 Standard for Energy Efficiency in Buildings and NRS 034-1: Rationalised User Specification for Electricity Distribution Guidelines for the provision of Electrical Distribution Networks in Residential Areas has been used as the basis for the load estimate. Reg No: 2004/123826/23 Members: G Naudé BEng (Electrical) (Hons), PrEng, SMSAIEE, Managing Member S J Snyman BEng (Electronic), MSAIEE, GBCSAAP

15 2 February 15, 2018 The proposed development will consist of three development zones which will collectively be developed into a mixed use, multi-generational life style estate; which will encompass freehold residential erven; a multistory sectional title retirement complex; and a retail complex incorporating retail space, a gymnasium, offices and also residential apartments; and a small zone will be allocated for services infrastructure. In summary: Zone 1 - Services zone 427 m 2 Zone 2 - Freehold residential erven 60 dwelling units Zone 3 - Sectional title retirement apartments 172 dwelling units Zone 4 - Mixed use zone which includes: - Retail 12448m 2 - Gymnasium 2081m 2 - Offices 2400m 2 - Sectional title apartments 108 dwelling units The development will be phased over a period of approximately 5-10 years from date of rezoning. The electrical load envisaged to be consumed for the development is estimated at 2,44 MVA once the development has been fully completed and is under full operation. The estimate is based on the proposed erf sizes and factored for the maximum allowable coverage in terms of the number of floors, type of use and allowable FAR. It is foreseen that there will be diversity between the residential and commercial peak demands and a combined estimated maximum demand of 2 MVA is predicted. Since the development is envisaged to be rolled out in phases, the estimated peak demand per phase is as follows (See Annexure B): Zone 1 - Services zone 28kVA Phase 1: within 1-3 years from rezoning Zone 2 - Freehold residential erven 274kVA Phase 1: within 1-3 years from rezoning Zone 3 - Sectional title retirement apartments 484kVA Phase 2: within 3-5 years from rezoning Zone 4 - Mixed use zone 1650kVA Phase 3: within 5-10 years from rezoning Factors that may influence the above predicted maximum demand are: Any specific commercial activity requiring a higher than predicted demand (high penetration of restaurants, bakeries etc.). This may result in an increase in the total demand requirement. Development of sites not done to full design capacity, particularly buildings not being erected to the full allowable coverage of the particular erf. This will result in a reduced site maximum demand. Improved energy efficiency as a driving force in industry resulting in continued reduction of electricity demand. Efficient hot water generation, PV Solar and LED based lighting (as examples) will reduce the load requirements on the residential section in particular as well as the retirement and commercial sections. Diversity between mixed use potions e.g. residential will not peak simultaneously with offices/retail sections. We applied diversity of 0,75 for retail and 0,5 for offices in this regard to predict the 2 MVA overall maximum demand. AVAILABILITY OF ELECTRICITY The existing supply connection of 315kVA will be able to cater for Phase 1 of the development. For the balance of the phases, electricity can be made available by the Local Supply Authority provided that a new 132 / 66 / 11 kv substation is established in the surrounding area. The space required for the new substation is approximately 150m x 150m. The position for the new substation must still be identified and confirmed. Reg No: 2004/123826/23 Members: G Naudé BEng (Electrical) (Hons), PrEng, SMSAIEE, Managing Member S J Snyman BEng (Electronic), MSAIEE, GBCSAAP

16 3 February 15, 2018 SUMMARY We summarise that Phase 1 of the proposed development can proceed within the constraints of the existing supply connection and that electricity can be made available for the balance of the proposed development once a new 132 / 66 / 11 kv substation is erected in the vicinity of the development. We recommend that adjacent land owners should be included to identify a suitable location for the new substation site. This report was compiled by: Stefan Snyman for Mapule Consulting Attachments: Annexure A: Annexure B: Annexure C: Existing electrical infrastructure drawing Load estimate calculation Proposed electrical reticulation for new development Reg No: 2004/123826/23 Members: G Naudé BEng (Electrical) (Hons), PrEng, SMSAIEE, Managing Member S J Snyman BEng (Electronic), MSAIEE, GBCSAAP

17 Annexure A Existing 11kV over headendofline Existing transformer room with 315kVA transformer. Metering DB and500acbonoutside 11kV under ground cable. Cable route to be confirmed Existing main LV DB Existing 11kV over head line Existing 11kV over head line

18 Mapule Consulting Cape cc Project: Bretagna Estate - Erf 26158, Paarl Annexure: B Service: Electrical load estimate Rev 3 ITEM DESCRIPTION ESTIMATED LOAD kva RETAIL & OFFICES DIVERSITY 1 Services zone 28 2 Full Title Erven (60 single residential) Sectional Title Retirement apartments (172 apartments) Retail space % 5 Gymnasium Offices (4 office spaces) % 7 Sectional Title Apartments (108 apartments) 306 TOTAL ESTIMATED DIVERSIFIED LOAD (kva) ,8

19

20

21 PLEASE REFER TO APPENDIX G7 OF THE BASIC ASSESSMENT REPORT

22

23 20 October 2017 The Manager : Civil Engineering Services Drakenstein Municipality P. O. Box 1 PAARL 7620 Attention: Mr Willem Pretorius Dear Sir PROPOSED DEVELOPMENT OF ERF 26158, PAARL: CAPACITY ANALYSIS OF THE BULK WATER & SEWER SERVICES The request by Ms Marthia Roos of Kabod Development Group regarding comments on the bulk water and sewer supply to the proposed development (Streetlea development on Erf 26158, Paarl), refers. This document should inter alia be read in conjunction with the Water Master Plan (performed for the Drakenstein Municipality) dated February 2017 and the Sewer Master Plan dated February Future development area PF13.1a, which includes the proposed development, was conceptually taken into consideration for the February 2017 master plans for the water and sewer networks. 1. WATER DISTRIBUTION SYSTEM 1.1 Distribution zones The master planning indicated that this development area should be accommodated in the existing N1 PRV zone. The connection to the existing system should be done on the future 200 mm diameter pipe to the southern side of the development, as shown on Figure 1 attached. The development is situated inside the water priority area. 1.2 Water demand The original water analysis for the master plan was performed with a total annual average daily demand (AADD) on Erf of 151,3 kl/d For this re-analysis, the total AADD and fire flows for the proposed development on Erf was calculated as follows: 96 0,4 kl/d/unit = 38,4 kl/d 159 Assisted living retirement 0,4 kl/d/unit = 63,6 kl/d 60 Single residential 0,6 kl/d/unit = 36,0 kl/d m 2 GLA 0,4 kl/d/100 m 2 = 56,9 kl/d m 2 GLA 0,4 kl/d/100 m 2 = 11,8 kl/d Total = 206,7 kl/d Fire flow criteria (Moderate risk) = m GLS Consulting (Pty) Ltd T F Elektron Street, Techno Park, Stellenbosch, 7600 PO Box 814, Stellenbosch, 7599, South Africa Reg no: 2007/003039/07 a member of the EOH Group of Companies Directors: A Bohbot, JW King, Z Mayet, BF Loubser, JJ Streicher and LC Geustyn

24 1.3 Present situation Bulk infrastructure The existing Leliefontein reservoir has sufficient capacity to accommodate the proposed development Reticulation system Accommodation of the development in the present system will require upgrading of the existing water reticulation network to comply with the pressure and fire flow criteria as set out in the master plan Static pressure The static pressures along the proposed supply pipe in the R301/ Wemmershoek Road will exceed 90 m water head and pressure reducing valves (PRV s) are therefore proposed on the water supply pipelines to the development in order to reduce high static pressures along the Wemmershoek Road. 1.4 Implementation of the master plan The following master plan items will be required to reinforce the existing water system in order to accommodate the proposed development together with other future development areas. Network upgrade DPW4.8 : m x 450 mm Ø new supply pipe R * DPW4.9 : Decommission existing N1-PRV R * DPW4.10 : m x 400 mm Ø new supply pipe & N1-crossing R * DPW4.11 : m x 400 mm Ø new supply pipe R * DPW4.15 : 10 m x 250 mm Ø cross-link R * DPW : Install new PRV & controller on proposed 450 mm Ø pipe R * DPW : Install new PRV & controller on proposed 450 mm Ø pipe R * DPW : New N1-PRV, controller & power supply R * Total R * (* Including P & G, Contingencies and Fees, but excluding VAT - Year 2016/17 Rand Value. This is a rough estimate, which does not include major unforeseen costs). Take note that the routes of the proposed pipelines are schematically shown on Figure 1, but have to be finalised subsequent to detail pipeline route investigations. 1 The PRV s should be installed at a setting of 45,0 m head (energy grade line = 165 m). 2 The PRV should be installed at a setting of 25,0 m head (energy grade line = 140 m). Provision should be made for a T-piece on the existing 500 mm diameter bulk pipeline and an isolating valve in order to accommodate master plan item DPW4.22. The minimum requirements to accommodate the proposed development in the existing system are master plan item DPW4.22 required to reduce the static pressure at the development, master plan items DPW11.1, DPW4.9 & DPW4.15 to relocate the existing N1 PRV and master plan items DPW4.10 & DPW4.11 to connect the proposed development to the existing water system.

25 2. SEWER NETWORK 2.1 Drainage areas The development falls within the existing Paarl gravity drainage area. The recommended position for the sewer connection for the proposed development is at future outfall sewer item DRS2.12, as shown on Figure 2 attached. From here it is proposed that sewage gravitates towards the proposed Paarl bulk sewer which is currently being constructed. The development is inside the sewer priority area. 2.2 Sewer flow In the recently completed sewer master plan, the peak day dry weather flow (PDDWF) for the proposed development area (future area P13.1a in the February 2017 sewer master plan) was calculated at 105,9 kl/d. For this re-analysis, the peak day dry weather flow (PDDWF) for the proposed development on Erf was calculated at 144,7 kl/d. 2.3 Present situation There is currently no infrastructure between the proposed development and the existing sewer network. 2.4 Implementation of the master plan The following master plan items will be required to connect the proposed development to the existing sewer system in order to accommodate the proposed development together with other future development areas. Network upgrade DRS2.10 : 260 m x 315 mm Ø new outfall sewer including river crossing R * DRS2.11 : 252 m x 250 mm Ø new outfall sewer R * DRS2.12 : 265 m x 200 mm Ø new outfall sewer R * DRS10.2 : m x 825 mm Ø new outfall sewer R * Total R * (* Including P & G, Contingencies and Fees, but excluding VAT - Year 2016/17 Rand Value. This is a rough estimate, which does not include major unforeseen costs). Take note that the routes of the proposed pipelines are schematically shown on Figure 2, but have to be finalised subsequent to detail pipeline route investigations. Provision should be made for a 3m pipeline servitude (in favour of the Drakenstein Municipality) to accommodate master plan items DRS2.10, DRS2.11, DRS2.12 & DRS10.2 above. 3. CONCLUSION The developer of Erf in Paarl may be liable for the payment of a Development Contribution (as calculated by the Drakenstein Municipality) for bulk water and sewer infrastructure as per Council Policy. Accommodation of the development in the present system will require upgrading of the existing water reticulation network to comply with the pressure and fire flow criteria as set out in the master plan.

26 The minimum requirements to accommodate the proposed development in the existing water system are master plan item DPW4.22 required to reduce the static pressure at the development, master plan items DPW11.1, DPW4.9 & DPW4.15 to relocate the existing N1 PRV and master plan items DPW4.10, DPW4.11, & DPW4.24 to connect the proposed development to the existing water system. There is currently no infrastructure between the proposed development and the existing sewer network. Master plan items DRS2.10, DRS2.11, DRS2.12 & DRS10.2 will be required to connect the proposed development to the existing sewer system. Also find attached hereto Appendix A which includes general notes from Drakenstein Municipality regarding development approvals and conditions. We trust that you find this of value Yours sincerely GLS CONSULTING (PTY) LTD REG. NO.: 2007/003039/07 Per: JJ STREICHER (Director) Cc Integrate Structural and Cilvil Engineering PO Box 3004 Matieland 7602 Mr André Burrows

27 APPENDIX A October 2017 GENERAL NOTES FROM DRAKENSTEIN MUNICIPALITY ATTACHED TO GLS SERVICES REPORT 1. The GLS report is a services capacity report and the costs estimated in this report are only approximate values applicable at the time of the study. 2. Should the development be approved by Council the approval will be linked to certain development conditions. These conditions will be the official conditions applicable to the project and will take precedence over this report. Once approval is granted, Council will enter into a formal services agreement with the developer. 3. Costs for network upgrades, etc. As mentioned in the GLS report could change from time to time due to escalation, new tariff structures, additional requirements etc. 4. The Developer may be liable to pay a Development Contribution as per Council policy. The value payable will be calculated using Drakenstein Municipality s Development Contribution Calculator. 5. The Development Contribution monies are calculated according to the approved Council Policy at the time of payment. 6. The Development Contribution monies are payable before the approval of the building plan certificate or final approval of the subdivision for the transfer of units will be issued, as applicable for the type of development. 7. Where servitudes are required, all the costs and arrangements therefore will be for the developer's account. 8. The developer will be solely responsible for the cost of the link services as identified in the GLS report. The developer will also be responsible for the costs of upgrading to the minimum requirements of the services as identified in the GLS report. These costs may however be off-set against the Development Contribution monies payable 9. If the developer is requested to provide bridging finance for the development, the outstanding amount will be repaid within a five year period at an interest rate determined by the Head: Finance of Drakenstein Municipality. 10. The above conditions are subject to any approved Council policies, which may be amended from time to time.

28

29

30

31

32

33