Mains design guidelines for self-lay organisations working in new developments. December 2015

Transcription

1 Mains design guidelines for self-lay organisations working in new developments December 2015

2 Contents Introduction and contact details 1 Design principles 1.1 Self-lay policy - General information 1.2 Point of connection 1.3 Routing positioning and location 1.4 Depth of mains 1.5 Pipe materials, sizing and pressure rating 1.6 Jointing 1.7 Mains in new development areas 1.8 Mains in existing streets 1.9 Mains in retail parks and commercial areas 1.10 Unadopted roads 1.11 Gated developments 1.12 Land rights 1.13 Water mains in a street 1.14 Water mains not in a street 1.15 Self-lay in land that is not a street 2 Pressures, flow and sizes 2.1 Design guidance pressure 2.2 Design guidance velocity of flow 2.3 Design guidance hydraulic gradient 2.4 Sizing new mains for domestic premises 2.5 Sizing mains for non-domestic and mixed developments 2.6 Managing water quality in new mains 3 Valves and air valves 3.1 Isolating valves 3.2 Air Valves 4 Washouts 5 Requirements for service pipes 5.1 Definitions 5.2 Conditions for connection 5.3 General requirements for service pipes 5.4 Service connection arrangements 5.5 Standard service connection details 6 Metering 6.1 Temporary supply installation (TBS) 6.2 Internal fit metering for flats or multi occupancy premises 6.3 Metering standard service connections 6.4 Meter specifications 6.5 Meter pits 6.6 Metering non-standard service connections 7 Fire fighting 7.1 Fire hydrants 7.2 Statutory duty 7.3 Requirements for firefighting water 7.4 Fire sprinkler systems 8 Abandonment and diversion of existing mains 8.1 A development with both a new mains and an abandoned main 8.2 Example of a redeveloped site with a diverted / abandoned main 9 Tree planting guidance

3 10 Example layouts for new mains and services 10.1 New mains in a shared drive 10.2 New mains in a footway 10.3 New mains to be installed with a gated development 10.4 New mains in a commercial area with an easement

4 Introduction This document aims to help self-lay organisations in designing their own schemes, by making clear our requirements for new pipework and other assets. These will become part of our supply network, often for decades to come. We therefore need to ensure they are fit for purpose and comply with a range of guidelines, explained over the following pages. Most of the standards we outline below are our own, often based on guidance from the National Joint Utilities Group (NJUG). They also include guidance based on UK legislation. Please note that failure to meet these standards could delay or prevent your approval. This document should be used in conjunction with our self-lay policy and companyspecific addendum to the WRc Code of Practice for the Self-Laying of Water Mains and Services (England and Wales), 2nd edition, This can be found in the Building and developing section of our website, under Self-lay water supply. We require developers to make an initial enquiry or a capacity check with us in advance of an application for a new connection to our network. This will help ensure there is sufficient capacity in our water network when it is needed and indicate the potential costs of providing any new capacity or using any previously installed capacity needed for the development. Completing a capacity check at planning stage will help avoid delays in supplying the site at construction stage. For further information, including details on pre-development enquiries, please refer to our website or contact us using the details below. Contact details Thames Water Developer Services 2nd Floor West Clearwater Court, Vastern Road, Reading, RG1 8DB Tel: Thames Water Utilities Ltd Registered in England and Wales No , Registered Office.

5 1. Design principles All works should comply with BS EN 850 Water Supply, Requirements for Systems and Components Outside Buildings. Design and construction should comply with the current edition of the Civil Engineering Specification for the Water Industry (CESWI). It should also be in line with the National Joint Utilities Group (NJUG) guidelines, Volume 2, available at Self-lay policy General information Please refer to our Self-Lay Policy and Addendum to the WRc Code of Practice, which can be found in the Building and developing section of our website, on the page headed Self-lay: How to apply. Click here 1.2 Point of connection We will determine the point of connection to the existing distribution network. System reinforcement might be required prior to connection depending upon capacity. We will not make the final connection of the self-laid main to the water distribution system until you have provided satisfactory disinfection, pressure test and water sample results. 1.3 Routing positioning and location When deciding on the optimum pipeline route, we will take into account the following factors: Hydraulic gradient Terrain and subterranean conditions Hazards and obstacles, including contaminated ground Existing and future land use Permanent access Transport facilities Utility services Agricultural practice Environmental impact Industrial and commercial development County structure plans On distribution mains, please ensure dead ends do not serve more than 100 properties. They should have a maximum design velocity of 0.6m/s. Please ensure that all water mains with unrestrained joints have thrust restraint at bends, junctions, line valves and changes in diameter. Wherever practicable, ensure that distribution mains are located in the footway/verge, in accordance with the NJUG guidelines Volume 1. The pipeline and associated fittings need to allow adequate access from public highways for the equipment and materials necessary to carry out valve operations, inspections, maintenance and emergency repairs, and decommissioning. Service strips A service strip is a dedicated trench for utilities services in public or private land. The main should be within a service strip provided by the customer. The service strip must be at least 1.8 metres wide if this width cannot be achieved, we will lay the main in a position which we deem most suitable. Service trenches should be provided within footpaths, roads, or verges. We sometimes find that the developer provides a service trench in a strip of land situated within the gardens of the new dwellings. Please ensure you avoid this and find a more suitable alternative. Buildings (existing or proposed) should not be situated immediately beside a service strip, as this impedes work to lay the main as well as future maintenance activities.

6 Adoptable verges An adoptable verge is a strip of unmade ground running parallel to the carriageway/footpath. If a main is to be laid within a verge, the finished surface should not be planted with trees and shrubs. Third party land Third party land is privately-owned land which requires entry in order to provide a development with water and is not owned by either the local council/highway authority or the applicant. In order to provide a development site with water, it may be necessary to cross land which is under several different ownerships. You should only consider laying mains within third party land as a last resort and should seek an alternative route wherever possible. The general concept of laying mains in private roads is acceptable. 1.4 Depth of mains Distribution mains should be laid in trenches where there will be a minimum cover of 0.9 metres and maximum cover of 1.2 metres this is to give any service connection adequate protection from frost (a minimum cover of 750mm). Every mains design drawing should carry the preferred layout template in accordance with NJUG guidelines, which indicates the depth of a water main in conjunction other utilities apparatus. When deciding on the depth of a main, please ensure you consider the weight and frequency of vehicles likely to travel over it. Please tell us if any new main has to be laid at a reduced depth due to underground obstructions, bridge decking restrictions or any other type of unavoidable obstruction. It is also your responsibility to include the depth of cover of the new main and the depth of cover at the point of connection to the existing main / mains on the as-laid drawing. 1.5 Pipe materials, sizing and pressure rating Choice of material All pipes must be marked with the Standard Dimension Ratio. High-performance polyethylene (HPPE) is our preferred material for new mains and should always be used unless the Soil Analysis Report determines otherwise. HPPE is identified blue as per NJUG guidelines Volume 2. HPPE pipe is referred to by its external diameter, and should be designed in 90mm, 125mm, 180mm and 250mm, and 355mm mains. HPPE has a pressure rating of 16 bar and is joined together by butt fusion and electro fusion. Marker tape should be used within the trench in order to provide a means of tracing HPPE pipe. Medium-density polyethylene (MDPE) should be used for should be used for service connection pipes up to and including 63mm. Neither HPPE mains not MDPE service connections are to be laid in sites which have been deemed contaminated by us following analysis of the customer s Soil Analysis Report. Wherever contamination is identified, new mains and service connections must be in plastic barrier pipe (up to and including 63mm). Please note that plastic is now our preferred material for barrier pipe. Ferrous pipe is referred to by its internal diameter and is designed in 100mm, 150mm, 200mm and 300mm sizes. 1.6 Jointing Butt fusion is our preferred method of jointing plastic pipe, which must be of identical diameter and pressure ratings. Butt fusion can only be carried out outside the trench, and electro fused couplings should therefore be employed where butt fusion is not practicable, i.e. when making the connection from a length of main to a fitting. Electro fusion couplings must be installed wherever the pipe cannot be butt fused, i.e. at bends, ends, directional changes, and where two sections of main are required to be joined within the trench. They must be HPPE (PE100) and can be black or blue in colour. All electro fusion fittings must incorporate fusion indicators. Gaskets are rubber rings, which provide a watertight seal within the joint. They provide a flexible joint and are installed within the socket end of the pipe in order to prevent the pipe separating. Gaskets should not be fitted at critical points such as bends, ends or directional changes, which require the installation of anchor gaskets.

7 1.7 Mains in new development areas Where the point of entry is less than 10 metres from a water main, service connections can be installed. KEY Service pipe Property boundary Water main Communication pipe Alternative service pipe route Shared drive Service pipe layout where supply pipe exit is less than 10 metres from a water main Where points of entry are further than 10 metres from a water main, a new main can be installed. KEY Service pipe Property boundary Water main Communication pipe New main Shared drive Mains and service pipe layout where supply pipe exit is more than 10 metres from a water main

8 1.8 Service connections in new streets or a street where a main is not installed New site road KEY New development boundary Water main Communication pipe New main Existing carriageway This shows a new development on a new street which has no water main. A new main would need to be installed to allow service connections.

9 1.9 Service connections to existing mains KEY New property boundary Existing water main New communication pipe Existing communication pipe Existing carriageway This shows a new development on the same side as an existing water main therefore no new main needs to be installed.

10 1.10 New mains in existing streets KEY New property boundary Existing water main New communication pipe New water main Existing communication pipe Existing carriageway Example showing where new main would be installed to avoid multiple road crossings This shows a new development on the opposite side to the existing main. In this scenario it can be beneficial to install a new main in order to avoid multiple road crossings.

11 1.11 Mains in retail parks and commercial areas Wherever possible new mains should be located in a road built to an adoptable standard. In retail parks, commercial and industrial areas, it may not always be clear which areas are streets, and there is a particular risk that layouts of buildings, car parks and access roads may be changed without consulting us. In such areas, we may require an easement to be granted, in order to protect our assets. New water mains should be co-coordinated with other services such as gas, electricity and telecoms, and laid in accordance with Volume 2 of the NJUG guidelines. KEY Existing water main Service pipe New water main Existing carriageway Car parking area Car parking area Easement An example showing where an easement may be required for a new commercial development

12 1.12 Unadopted roads An adoptable standard footpath is a walkway that is constructed to the standards demanded by a local council or highway authority. The footpath is normally of a minimum width of 1.8 metres. SLOs should only consider laying mains in a footpath narrower than 1.8 metres if it is not used by any other utilities services. If the main is not laid within this footpath, then it should be positioned in the road about one metre from the kerb line. An adoptable standard road is a carriageway road that is constructed to the standards demanded by a local council or highway authority. The carriageway is normally of a minimum width of 5.5 metres. If the main is not laid within this carriageway, it should be positioned approximately one metre from the kerb line Gated developments If a private road is gated, it is good practice to install a valve on the main just outside the gate. This will ensure that we can close in the main without affecting other customers Land rights The Water Industry Act 1991 allows us to lay pipes in streets and private land, and we usually rely on these powers rather than obtaining formal easements. These rights do not apply when the pipes are laid by an SLO. any other utilities. If the main is not laid within this footpath, it should be positioned in the road about one metre from the kerb line. An adopted road is a carriageway which is maintained by the local council or highway authority. The carriageway is normally of a minimum width of 5.5 metres. If the main is not laid within this carriageway, it should be positioned approximately one metre from the kerb line Water mains not in a street Sections 158, 159 and 168 of the Water Industry Act 1991 give us powers to lay mains in streets and private land without obtaining formal easements Self-lay in land that is not a street When mains are self-laid in private land and intended to be subsequently adopted by us, the rights provided by the Water Industry Act 1991 do not apply to SLOs. In such cases, the developer will need to obtain permission from the land owner to install the pipes and then arrange for a deed of easement in favour of Thames Water to be in place before the new mains can be adopted and connected to our network. Any costs incurred in arranging the permissions and subsequent transfers to Thames Water are to be paid by the developer. Advice on all issues concerning pipes in private land should be sought from us. This requirement for land rights should be assessed at design stage and indicated on the approved layout drawings prior to any acceptance of the scheme by the developer. Please ensure you tell us when any proposed land rights are needed so that all required documentation is in place at the earliest possible stage. Any as laid record must be fully in accordance with the planned position of the main that was shown in any notice before the main is connected to our network Water mains in a street An adopted footpath is a public walkway which is maintained by the local council or highway authority. The footpath is normally of a minimum width of 1.8 metres. SLOs should only consider laying mains in a footpath narrower than 1.8 metres if it is not used by

13 2. Pressures, flow and sizes 2.1 Design guidance pressure Our requirements on network pressures are as follows: At all times the pressure within the network must be maintained above 1.5 bar. The design of the replaced network must not result in pressures above 10 bar unless previously agreed with us. The design must limit the hydraulic level across the area at peak instantaneous flow, to avoid unacceptable pressure changes throughout the day. Hydraulic gradients need to accommodate areas with significant ground level changes or tall buildings. Please also note that we may require you to install pressure management systems in areas where the static pressures exceeds 5 bar. 2.2 Design guidance velocity of flow The velocity of flow should be between 0.4m/s and 0.6m/s under average daily operating conditions, and between 0/6m/s and 1.0m/s under peak daily operating conditions, excluding emergency conditions. 2.3 Design guidance hydraulic gradient Any new pipe or network change should be designed so that the hydraulic gradient is typically in the range of 2 to 4 metres per 1000 metres in the proposed main, and in any existing mains that may be influenced by the proposal. However, if downstream pressure is available in sufficient quantity and its reduction is not a concern to us, then a hydraulic gradient not exceeding 10 metres in 1000 metres can be used. 2.4 Sizing new mains for domestic premises The following should be used as a guide to the number of residential properties that can be supplied from a new main. These figures are for new mains calculations only and must not be used for service connections. Internal diameter 75mm 100mm 150mm 200mm 300mm Residential properties 60 houses or 100 flats 130 houses or 230 flats 400 houses or 700 flats 900 houses or 1500 flats 2600 houses or 4500 flats When a new development has a mixture of houses and flats, the overall demand of the development should be calculated and the mains sized accordingly. 2.5 Sizing mains for non-domestic and mixed demands We must carry out the sizing of mains on schemes for non-residential properties, as these need to be modelled, or may have already been modelled. Under the Water Industry Act 1991, we can refuse to supply premises requiring non-domestic use. However, we always look to accommodate customers requirements and refusal is only in extreme cases. You must ensure you match our requirements for example, regarding storage before we agree to supply the premises. 2.6 Managing water quality in new mains Please avoid dead legs wherever possible. New mains should be designed to ensure that the last service connection point is no more than one metre away from any end washout. Mains should not be laid and commissioned in anticipation of future development, as this would constitute a dead leg. Tees can be installed for future phasing of a development, providing they have a valve and washout on the outlet.

14 3. Valves 3.1 Isolating valves Valves are installed to isolate sections of main and to ensure integrity of supply. A valve is installed on every tee outlet for shutting in and identifying the line of the main. The only exception to this rule is where a tee connection includes a valve fitted either side (inline), in which case there is no gain achieved by the installation of a valve on the outlet branch. A valve should be installed along a straight length of new main in order to protect more than 50 properties. A valve should be fitted every 500 metres along a straight length of new main, in order to isolate sections of main for future repair and maintenance purposes. A valve should also be installed on a main immediately on the public side of any gated private access roads. This will ensure that the main can be closed in without affecting other customers. 3.2 Air valves Air valves are a means of venting air from the network. They should be installed at points where air can accumulate, such as high points along the route of a new main, bridge crossings and where a main is diverted under an obstruction. An air valve should be installed in conjunction with a tee along the line of a main. When installing an air valve within a verge or soft ground, the chamber should be adequately supported. This is achieved by providing a onesquare-metre layer of concrete to 150mm depth around the chamber, which prevents foliage growing over the chamber and damage to the fitting when operating. Depending on the size and nature of the proposed new development, and the layout of the existing network, it may be necessary to install new valves either side of the tee connection to ensure integrity of supply. When installing a valve within a verge or soft ground, the chamber should be adequately supported. This is achieved by providing a one-square-metre layer of concrete to 150mm depth around the chamber, which prevents foliage growing over the chamber and damage to the fitting when operating. Valves should comply with BSEN1563, and internal and external protection must be provided by blue fusion-bonded epoxy powder coating. All valves should be right-hand (clockwise) close only.

15 4. Washouts Washouts are installed in order to maintain the integrity of the water supply by providing flushing points. Combinations of isolation valves and washouts must be provided to enable the isolation and flushing of sections of the main. Washouts must be installed: When installing a washout within a verge or soft ground, the chamber should be adequately supported. This is achieved by providing a onesquare-metre layer of concrete to 150mm depth around the chamber, which prevents foliage growing over the chamber and damage to the fitting when operating. To achieve isolation of a maximum of 500 properties At road junctions At all tees At a maximum distance of 100 metres apart A washout must be installed at the end of every leg of main, no more than one metre after the last service connection, in order to prevent the build-up of stagnant water in the main. When connecting a new main between two or more existing mains, washouts should always be installed on the outlet branch of the tee connection point with any existing main. This provides adequate facility for any future disinfection / flushing required across the site. Please ensure you install washouts and a valve every 500 metres along a straight length of new main, so that sections can be disinfected and flushed following any future repair / maintenance activities. A washout must always be installed next to every closed district boundary valve.

16 5. Requirements for service pipes 5.1 Definitions The communication pipe is the part of the service pipe owned by us and laid in the same street as the main to which it is connected. The service pipe connects the water main and the premises being supplied. The supply pipe is the part of the service pipe belonging to the property owner, and laid within the property boundary. 5.2 Conditions for connection We will only connect new pipework to our network once these conditions have been met: We have received payment for the quotation. A Water Regulations inspection has taken place confirming the pipework laid is to the correct standard. We have received chlorination results and confirmed that they are acceptable for all supplies with an internal diameter of 50mm and greater. 5.3 General requirements for service pipes Services on non-contaminated sites up to and including 63mm must be made of MDPE (PE80). Services on contaminated sites must be made of barrier pipe. 5.4 Service connection arrangements When a new development is being planned, service connections should be designed in conjunction with both new and existing mains to ensure that services are: Laid in a position agreed with Thames Water Generally perpendicular to the main Not crossing others land A minimum of 25mm diameter blue PE (or barrier pipe as required), minimum depth 750mm, maximum depth 1350mm Pipework in and around a typical home Inside stop valve Property boundary Foundations Internal pipe Point of entry Supply pipe Outside stop valve Communication pipe

17 5.5 Standard service connection details The service pipe must be installed up to the property boundary. It should be installed at right angles to the distribution main and follow a straight line to the boundary box wherever possible. All service pipes and meter inlets and outlets must be installed with a minimum cover of 750mm. You must inform us if this cannot be achieved, or if a customer supply pipe is found to be less than 750mm in depth. The service pipe and supply pipe must be connected with a service adapter at the property boundary. Where a service has been laid through a duct, the duct must only be used if it is at the correct depth (750mm), and is in line with the customer supply pipe. When installed, the tapping duct and meter box must be in a straight line. All customer connections to the network must have a means of isolating the customer supply.

18 6. Metering 6.1 Temporary supply installation When designing or setting up a temporary builder s supply, this diagram shows all the components that need to be in place prior to connecting to the network. Hose union bib-tap Property boundary Lockable Housing Insulated pipe-work and fittings securely bracketed to post or brick wall WRAS approved meter box located at point of connection Ground level Drain tap Double check valve assembly In-line stop tap Supply should be laid at minimum depth of 750mm Insulated ducting

19 6.2 Internal fit metering for flats or multi occupancy premises Please refer to our internal fit metering guidance leaflet. 6.3 Metering standard service connections For further information, please refer to our Self-Lay Policy and Addendum to the WRc Code of Practice. Click here 6.4 Meter specification All meters are sourced by us at a cost to the developer or the SLO. Concentric 15mm meters are used for external fit in boundary boxes / manifold boxes. Internal meters are 20mm in line and are supplied with a fitting kit. 6.5 Meter pits Boundary boxes are used to install up to six meters on pipework entering a property at the same location. A 600mm x 450mm pit will be required for installations of up to six meters if a boundary box cannot be used. It must be possible to read the meter from the top of the chamber at ground level. It must also be 300mm to 600mm below ground level. Boundary box installations must not sit on any other utilities pipes or cables, or any drain or duct. Boundary boxes must be Class B rated and may be used in areas subject to occasional traffic loading. An Atplas box must be used for 25mm and 32mm connections. 6.6 Metering non-standard service connections Service connections greater than 32mm in diameter are classed as non-standard connections. These may be used to supply a number of individually metered premises or a single premises, where fitted with a bulk meter. The arrangements for metering and their locations are likely to be design-specific and dependent on the construction of the building, the layout of the pipe work and the availability of sufficient space to facilitate the meter installation.

20 7. Fire fighting 7.1 Fire hydrants Fire hydrants are installed for the relevant fire authority for the purpose of firefighting. They are water company assets but are the responsibility of the fire authority. Fire hydrants are installed as a requirement under the Fire Services Act A fire hydrant is an identical fitting to a washout, but identifiable by its cover marked FH. Fire hydrant positions are highlighted on the approved drawings and are subject to approval by the fire authority. Fire hydrants must be installed within the footpath every 180 metres along a straight length of main. No property should be more than 90 metres from a hydrant. The hydrant must be installed to the correct specification as detailed on the mains drawing. Its installation details are subjected to an audit checklist. Hydrants must be compliant with BS750:1984. All hydrants must have a copper alloy (gunmetal) outlet and an automatic frost valve. Hydrants must be of a fixed jumper design. When installing a hydrant within a verge or soft ground, the chamber should be adequately supported. This is achieved by providing a onesquare-metre layer of concrete to 150mm depth around the chamber, which prevents foliage growing over the chamber and damage to the fitting when operating Hydrants should be located so that fire and rescue services fire hoses do not run across dual carriageways or railways during firefighting. Additional hydrants may be needed to avoid this possibility. 7.2 Statutory duty We are responsible for contacting and providing the relevant fire and rescue service with all information needed to assess firefighting requirements. The fire and rescue service should respond to us, detailing their requirements, within 42 calendar days of having been provided with all necessary information. We will then provide drawings for on-site auditing purposes based on the approved water main design, indicating the location of any required firefighting equipment. We may refuse to connect any new mains where the agreed firefighting equipment has not been installed, or where a fire and rescue service has not been given adequate opportunity to provide their requirements. 7.3 Requirements for firefighting water The Local Government Association / Water UK national guidance document on the provision of water for firefighting gives guidelines on flow requirements for firefighting as follows: Type of development Housing (2 floors or fewer) 8 Ideal required flow (l/s) Housing (more than 2 floors) Industrial (1 hectare or less) 20 Industrial 1-2 hectares 35 Industrial 2-3 hectares 50 Industrial (more than 3 hectares) 75 Shops, offices, recreation Community halls 15 Primary school, health centre (1 floor) 20 Secondary school, health centre (2 or more floors) Fire sprinker systems Please refer to our fire supply policy, available on request.

21 " (90) SI Cottage West End Cottage 8. Abandonment and diversion of existing mains The Water Industry Act 1991 requires us to alter or remove any pipe or other apparatus if requested to do so by a developer if the land cannot be developed without the required alteration or removal. This requirement does not apply to any pipe or equipment that is located in a street. We will require advance payment of the estimated reasonable cost of diverting or abandoning any existing mains or associated equipment. This applies to both self- lay and requisition schemes. 8.1 A development with both a new main and an abandoned main For this development it was necessary to install a new main for half of the development and also to abandon and divert an existing main to accommodate the new buildings on farm land. Old Post Office Cottages FH P 1 "THRUST BLOCK" (AS REQUIRED) 3" 1 90mm HPPE W P 2 1x 32mm MDPE 1x 32mm MDPE 1x 32mm MDPE 1x 32mm MDPE 3" (90) SI Rosemary P 4 3" (90) SI 4 Owl Cottage P 3 90mm HPPE Pla 90mm HPPE 148.0m 1

22 8.2 Example of a redeveloped site with a diverted/abandoned main This is a development where the existing site has been redeveloped. As a result the main in yellow has been abandoned to accommodate new houses that have been built where a road used to be. New mains also had to be installed.

23 9. Tree planting guidance The diagram below sets out the minimum distances that should exist between water mains and certain types of tree. Please ensure you adhere to these distances in order to protect trees from any future maintenance we need to carry out on the main. You should also read the NJUG guidelines Volume 4 for further information. Large growing species Poplars and Willows 10.0m Distance from pipeline Large conifers and deciduous forest trees Scots pine Black Pine Cedar Larch Ash Beech Sycamore Horse Chestnut Sweet Chestnut London Plane Hornbeam Lime Alder Elm Oak Apple Plum Cherry Lime Pear 6.0m Dwarf stock fruit trees Amenity Trees Field Maple Wild Cherry Crab Apple Cobnut Birch Elder Ornamental Trees Mountain Ash Whitebeam Cockspur Thorn False Acacia Lawsons Cypress 3.0m Shrub planting bushes Holly Laurel Privet Rhododendron Christmas Tree Dogwoord Spindle Guelderrose Gooseberries Raspberries Currants Roses Loganberries 1.5m Hedge plants and ground cover Hedge plants and where necessary over the pipeline, road and field crossings etc. Ground cover Hawthorn Snowberry Blackthorn Berberis Heathers Cotoneaster

24 90mm HPPE SLO TO MAKE TH PIECE THROUGH TW SUPERVISION 10. Example layouts for new mains and services 90mm HPPE 6 125mm HPPE "THRUST BLOCK" (AS REQUIRED) SLO TO MAKE THE FINA PIECE THROUGH UNDER TW SUPERVISION P New mains in a shared drive In this example the new mains and communication pipes will be installed within the shared driveway. There is no requirement for an easement as the new main is installed in a street. 90mm HPPE 125mm HPPE 3 3 "THRUST BLOCK" (AS REQUIRED) 90mm HPPE 125mm HPPE "THRUST BLOCK" (AS REQUIRED) 125mm HPPE 90mm HPPE 90mm HPPE 125mm

25 10.2 New mains in a footway In this example the new mains and communication pipes will be installed within the footway. It does not matter whether the footway is adopted or a shared footway as the new main is installed in a street and there is no requirement for an easement. Way P mm HPPE Playground P 1 4" CAST IRON "THRUST BLOCK" (AS REQUIRED)

26 10.3 New mains to be installed within a gated development In this example the new mains and communication pipes will be installed within the private driveway of a gated development. There is no requirement for an easement as the new main is installed in a street. A controlling valve is sited outside the gated area so that the main/services can be isolated without delay if needed. P mm BARRIER PIPE FH P 1 "THRUST BLOCK" (AS REQUIRED)

27 riageway FH 1x63mm SPRINKLER CONNECTION FH 1 2 Keep Clear 1x 25mm BARRIER PIPE FOR BIN STORE 10.4 New mains in commercial area with an easement In this example the new main would require an easement to protect our assets from any future changes to the site layout. Lake P 2 450mm STRATEGIC 450mm STRATEGIC 1x32mm BARRIER PIPE MANAGEMENT SUITE 100mm DUCTILE IRON FH 150mm 100mm MAIN ABANDONED ON mm 100mm DUCTILE IRON 600mm Drain P 1 "THRUST BLOCK" (AS REQUIRED) P 6 100mm DUCTILE IRON P 3 150mm "THRUST BLOCK" (AS REQUIRED) 1x 25mm BARRIER PIPE FOR BIN STORE 100mm DUCTILE IRON P 4 100mm DUCTILE IRON DAVENTRY ROAD Drain El Sub Sta CONNECTION SPRINKLER 6" 150mm 150mm 100mm 150mm 94.9m P 5 "THRUST BLOCK" (AS REQUIRED) AY,WILDMERE ROAD,BANBURY,OX16 3XS REV 3