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  Hastings District Council : Engineering Code of Practice Part 2 : Engineering Standards, Water Supply Hastings District Council - Code of Practice for Subdivision and Land Development Part 2 Section 2.5 November 1997 1 Contents   The Contents of this Section are as follows: page  2.5.1 Introduction 2 2.5.2 Performance Criteria 2 2.5.3 Design Guidelines - Reticulated Areas 3 2.5.4 Design Guidelines - Non Reticulated Areas 10 2.5.5 Guidelines for Specifications 12 2.5.6 Inspection During Construction 20 2.5.7 General Requirements for Developers 21 Section 2.5 Water Supply    Hastings District Council : Engineering Code of Practice Part 2 : Engineering Standards, Water Supply Hastings District Council - Code of Practice for Subdivision and Land Development Part 2 Section 2.5 November 1997 2 2.5 Water Supply   2.5.1 Introduction  This section provides a set of engineering standards for the design and construction of drinking-water reticulation systems which are to come under Hastings District Council (HDC)  jurisdiction and/or ownership. The section also provides guidance for effective and systematic construction supervision leading to high standards. Our objective in design and construction is to distribute water for consumption and fire fighting which meets the appropriate standards for these uses. 2.5.2 Performance Criteria  2.5.2.1 Hygiene   A water reticulation facility shall: a) Deliver water to the point of supply which complies with the Drinking-Water Standards for New Zealand (DWSfNZ), 1995  . b) Minimise the risks of contamination being introduced into the water. c) Meet the water supply performance criteria of the New Zealand Building Code.   2.5.2.2 Capacity and Layout   A water reticulation facility shall: a) Have sufficient capacity to provide adequate flow and pressure to meet the anticipated demand over its lifetime. b) Meet the fire protection requirements of the NZ Fire Service Code of Practice for Fire Fighting Water Supplies  c) Be located in such a way as to adequately service each lot, and provide reasonable access for maintenance. d) Minimise adverse effects on, and be compatible with, the existing water reticulation network. e) Minimise disruption to other parts of the network during maintenance; by having adequate interconnections, valves, and separating trunk main supplies from local reticulation. f) Where practical utilise mechanical, electrical, alarm and telemetry equipment which is compatible with existing equipment used by HDC.  Hastings District Council : Engineering Code of Practice Part 2 : Engineering Standards, Water Supply Hastings District Council - Code of Practice for Subdivision and Land Development Part 2 Section 2.5 November 1997 3 g) Where the expected life of any component is less than that of the system of which it is a part, make provision for access and removal of that component. h) Ensure that mechanical and electrical equipment is either designed for submergence, or located above the 100 year design flood level (refer Section 2.3 Stormwater). 2.5.2.3 Structural integrity   A water reticulation facility shall: a) Be constructed of materials compatible with the chemical properties of the water being conveyed, suitable for the intended duty with a minimum design life of 50 years, and with a proven record of performance. b) Minimise leakage, the ingress of contaminants, and the penetration of roots. c) Provide electrical and mechanical equipment with a life span and quality of the best currently available technology. d) Withstand all anticipated superimposed loads and network pressures (including those from transient surges which could reasonably be expected from pump failure, pump starts, and sudden valve closure). 2.5.3 Design Guidelines : Reticulated Areas  2.5.3.1 General  A reticulated water supply shall be installed in all subdivisions and provide a domestic and fire fighting supply to each lot in the subdivision. In localities where either the existing system is inadequate or where a higher pressure supply system is required, the subdivider shall provide and meet the cost of all pumping facilities, pumping mains, storage facilities and reticulation mains as required. In the case of larger subdivisions, and/or areas difficult to supply, the proposal should be discussed at an early stage with HDC who will advise of any special requirements or conditions. The approval of HDC shall be obtained for any proposed connection to a piped water supply service under HDC control. Approval shall be obtained in writing before work commences. Approval to connect will be based on the capacity available (which will be checked by HDC staff using the HDC reticulation model), as well as the engineering aspects for the proposed works. Connections to piped systems controlled by the HDC will be carried out by HDC or their nominated representative at the applicant’s expense. The requirements applicable for land zoned Rural or Heretaunga Plains where the urban standard is not required, are covered in Section 2.5.4.3, Community Supplies.  Hastings District Council : Engineering Code of Practice Part 2 : Engineering Standards, Water Supply Hastings District Council - Code of Practice for Subdivision and Land Development Part 2 Section 2.5 November 1997 4 The following topics are included in the discussion of design guidelines for a reticulated area: 2.5.3.1 General 2.5.3.2 Pipe Capacity to Meet Demand 2.5.3.3 Storage 2.5.3.4 Provision of Alternative Flow Path 2.5.3.5 Pump flow 2.5.3.6 Reticulation Layout 2.5.3.7 Service Pipe Sizes 2.5.3.8 Water Meters 2.5.3.9 Tobies 2.5.3.10 Backflow prevention 2.5.3.11 Hydrant Location 2.5.3.12 Valve Location 2.5.3.13 Thrust Blocks 2.5.3.2 Pipe Capacity to Meet Demand  The mains shall be designed to provide the minimum residual pressures, as set out below, at the flow which is the greater of either: ã the required fire flow plus two thirds of the peak daily demand (on the maximum day), or ã the peak daily demand (on the maximum day). The Design demand figures for the reticulation system shall be: Domestic Supply   ã  Average consumption : 300 litres/person/day. ã Peak 2 hour flow : 2.0m 3 /person/day. ã Minimum service pressure at the point of supply shall be 350 kPa (35m water head) unless the site is located in a low pressure area designated by HDC. ã  Average population per household shall be taken as 3.5 except for the following beach settlements where a higher household population shall be assumed: Waimarama 5.0 Waipatiki 5.0
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