Detailed Design Report for Bulk Civil Engineering Services
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DETAILED DESIGN REPORT FOR BULK CIVIL ENGINEERING SERVICES (WATER, SEWER, ROADS AND STORMWATER) PROPOSED TOWNSHIPS TIGANE EXTENSION 7 AND TIGANE EXTENSION 8, HARTBEESFONTEIN, KLERKSDORP MATLOSANA SEPTEMBER 2020 Issue 1 Prepared by Consultant: RAJASAMWAY FAMILY HOLDINGS PTY LTD 12 Greenwood 100 Olympus Drive Faerie Glen, 0081 Pretoria Gauteng Contact Person: R. W. Salim Page 1 of 53 ISSUE & REVISION RECORD QUALITY APPROVAL Capacity Name Signature Date Candidate Civil By Author Michael Benhura 25/09/2020 Engineer Approved by 25/09/2020 Design Centre Project Leader R. W. Salim Leader P.P Madumo Approved by Pr.Tech (ECSA) Project Project Engineer 25/09/2020 Engineer Professional Reg. No.:2015305049 Accepted and Approved (City of Matlosana Local Municipality) This report has been prepared in accordance with Rajasamway Family Holdngs cc Consultant Quality Management System. REVISION RECORD Revision Objective Change Date Number 00 Issued to Client Issued for Approval 29/09/2020 Page 2 of 53 Table of Contents 1 Introduction ............................................................................................................. 7 1.1 Appointment ..................................................................................................... 7 2 Project Details......................................................................................................... 7 2.1 Project Name ................................................................................................... 7 2.2 Locality ............................................................................................................. 7 3 Site Description ....................................................................................................... 8 3.1 Existing zoning ................................................................................................. 8 3.2 Proposed development .................................................................................... 9 3.2.1 Tigane Extension 7 .................................................................................... 9 3.2.2 Tigane Extension 8 .................................................................................... 9 3.3 Topography .................................................................................................... 10 3.3.1 Tigane Extension 7 .................................................................................. 10 3.3.2 Tigane Extension 8 .................................................................................. 10 3.4 Site Characteristic .......................................................................................... 10 3.4.1 Topography ............................................................................................. 10 3.4.2 Climate .................................................................................................... 11 3.4.3 Vegetation ............................................................................................... 11 3.5 Geotechnical Conditions ................................................................................ 11 4 Design Guidelines ................................................................................................. 13 5 Availability of Bulk Services .................................................................................. 14 5.1 Water ............................................................................................................. 14 5.1.1 Water Source ........................................................................................... 14 5.1.2 Water Purification works .......................................................................... 14 5.1.3 Service reservoirs .................................................................................... 14 5.1.4 Supply pipelines and pump systems ....................................................... 15 5.2 Sewer ............................................................................................................. 15 5.2.1 Bulk Services ........................................................................................... 15 5.3 Roads ............................................................................................................. 15 5.4 Stormwater ..................................................................................................... 16 5.5 Solid Waste .................................................................................................... 16 6 Level of Service and Design Guidelines ............................................................... 16 Page 3 of 53 6.1 Outline Scheme .............................................................................................. 16 6.2 Water Reticulation .......................................................................................... 17 6.2.1 Water Demand Calculation ...................................................................... 18 6.2.2 Bulk Water Sizing Pipe sizing .................................................................. 19 6.2.3 Reservoir sizing ....................................................................................... 20 6.3 Sewer Reticulation ......................................................................................... 22 6.3.1 Bulk Sewer Pipe Sizing............................................................................ 23 6.3.2 Existing Hartbeesfontein Wastewater Treatment Plant ........................... 25 6.4 Roads ............................................................................................................. 26 6.4.1 Access ..................................................................................................... 26 6.4.2 Classification of Roads ............................................................................ 26 6.4.3 Pavement Design .................................................................................... 26 6.5 Storm water .................................................................................................... 27 6.6 Solid Waste .................................................................................................... 27 7 Mechanical ........................................................................................................... 28 7.1 PUMP SIZING ................................................................................................ 28 7.1.1 PROPOSED WATER PUMP STATION................................................... 29 7.1.2 DETERMING TOTAL HEAD. ................................................................... 29 7.1.3 MAJOR AND MINOR PIPE LOSSES ...................................................... 30 7.1.4 DETERMING PUMP POWER ................................................................. 30 7.1.5 PARAMETERS IN SELECTING PUMP TYPE ........................................ 31 7.1.6 CONTROLS ............................................................................................. 31 7.1.7 SENSORS TO BE UTILISED IN CONTROLLING AND MONITORING PUMPS 32 7.2 PROPOSED NEW SEWER PUMP STATION EXT 8 ..................................... 32 7.2.1 DETERMING TOTAL HEAD. ................................................................... 33 7.2.2 MAJOR AND MINOR PIPE LOSSES ...................................................... 33 7.2.3 DETERMING PUMP POWER ................................................................. 33 7.2.4 PARAMETERS IN SELECTING PUMP TYPE ........................................ 34 7.2.5 CONTROLS ............................................................................................. 34 7.3 EXISTING SEWER PUMP STATION EXT 7.................................................. 34 7.3.1 DETERMING TOTAL HEAD. ................................................................... 35 Page 4 of 53 7.3.2 MAJOR AND MINOR PIPE LOSSES ...................................................... 35 7.3.3 DETERMING PUMP POWER ................................................................. 35 7.3.4 PARAMETERS IN SELECTING PUMP TYPE ........................................ 36 7.3.5 CONTROLS ............................................................................................. 36 8 Pump Station Sump Design .................................................................................. 37 8.1 PUMP STATION DESIGN PHILOSOPHY ..................................................... 37 8.1.1 Design Criteria (Ex 7 & 8) ........................................................................ 37 8.1.2 Special Considerations (Ex 7 & 8) ........................................................... 37 8.2 DESIGNED INFRASTRUCTURE ................................................................... 38 8.2.1 Design Data; Extension 7 ........................................................................ 38 8.2.2 Design Data; Extension 8 ........................................................................ 38 8.3 Sump and Pumps ........................................................................................... 39 8.3.1 SUMP WELL LAYOUT (Ext 7 & 8) .......................................................... 40 8.3.2 EMERGENCY STORAGE ....................................................................... 40 8.3.3 SUMP DIMENSIONS............................................................................... 40 8.3.4 PUMPSTATION OPERATING LEVELS .................................................. 41 8.3.5 PUMPING STATION PIPEWORK ........................................................... 41 8.3.6 INLET SCREENING