The AECOM canal, aka “The Natural Grid” David Weight
Summary of need: • In 2009, the government’s chief scientist, Sir John Beddington, warned of a perfect storm of problems by 2030. He said: “Our food reserves are at a 50 -year low, but by 2030 we need to be producing 50 per cent more food. At the same time, we will need 50 per cent more energy, and 30 per cent more fresh water”. • Can piecemeal measures be sufficient in the long term, or do we need a bigger plan?
Canal from Scottish Borders to S.E. England Functions: • Water storage and supply • Transportation • Power transmission • Communication link to data centres • District heating • Cooling • Opportunities for regeneration and eco-towns / eco-villages • Flood relief? • Leisure and tourism • Biodiversity
Existing water industry basket of measures (Maybe not fully utilised?) • Leakage control • Treated sewage effluent/reuse • Groundwater recharge (from stormwater/flood events) • Water Sensitive Urban Design (WSUD) • Beneficial, but will it meet the need?
1942 Pownall Grand Tour Canal planhttp://www.waterwaysworld.com/latest.cgi?month=062011&start=20 Original plan was close to the 300 foot contour throughout No locks through main route! Many lifts down to existing canals and navigable rivers.
Water supply • Public water supply • Serving power stations • Industrial processes • Rivers, streams, canals and aquifers • Agriculture – could serve farm reservoirs • Sustainable abstractions reducing dramatically. • ICE “State of the Nation – Water 2012” report Three quarters of our water needs are met by water resources from other nations!
Water supply • Water companies in the South-East are facing pressure and supply problems from: – Population growth – Climate change – and reduction in permissible abstractions. (Loss of water for just Anglia, Thames and Affinity, will be about 600Ml/day- about 320m m3 p.a.) • They are intending do respond with a mix of measures, but mainly: – Addressing leakage, and demand reduction (incl metering) – Transfers between river basins within regions and between regions – New reservoirs, and – Desalination plants
Water demand for food • Huge unmet water demand, especially in South East • We currently only grow 59% of the food we consume in the UK Water supply • Kielder water could supply about 900Ml/day (329m m3 p.a.). • However, in event of drought in NE, may need to supply The Tyne and Tees areas through existing links, so may only have 450Ml/day for areas further south. • But opportunities to get water from NW of Kielder if needed long term + opportunities for pumped hydro generation / storage. • STOR (short term operating reserve) technologies command enhanced revenue / kWhr • Pumped hydro is the most efficient and responsive of all STOR technologies
Rainfall. http://www.metoffice.gov.uk/media/pdf/6/i/No._04_-_Climate_of_the_British_Isles.pdf
Areas of over-abstraction: http://cdn.environment-agency.gov.uk/geho1208bpas-e-e.pdf
The need to span climate zones: http:// www.metoffice.gov.uk/news/releases/archive/2011/spring-rainfall-contrast
Canals versus pipelines Advantages • No pumping or energy required. Instead, small hydro generation expected. • Amenity benefits: leisure boating, walking, cycling, nature wetlands, water parks, etc. • Some freight transport • Scope for water-based eco-towns and eco-villages. • Transmission route for HVDC power • Route for district heating and for data comms. • Rich bio diversity opportunities Disadvantages • Less direct (more meanders) • Leakage and evaporation • Pollution • Route for invasive species • Greater planning problems • Maintenance?
Useful contours running down through England
Using GIS to find least cost route
Overview of plan Size of canal is undecided. Original idea was strongly influenced by transport, and was, 25m wide x 4.5m deep Flowing at an average speed of 0.3 m/sec. Providing about 2,600 Ml/day BUT Could be as small as 5m wide x 4.2m deep flowing at avg 0.3m/ sec which would provide only about 500 Ml/day, while still providing spin-off benefits
Canal Characteristics • Canal length approximately 620 km • Direct distance approximately 450 km • Around 5 to 7 locks of between 5 to 15m drop each • Scope for micro-hydro generation at locks • Phasing: • Phase 1 intended to run from Kielder reservoir down to the existing canal network near Leeds. • Could benefit areas further south through existing links (a cascade effect)
Power and transmission - Scottish Generation Policy Statement http://www.scotland.gov.uk/Publications/2012/03/9434 • Target is 14 – 16 GW of renewable energy capacity by 2020, • But planning 30 GW with a view to export • If and when wave and or deep off-shore wind becomes viable, then the potential is way beyond 30 GW • Current intention: some routed by Irish Sea, some by North Sea • Prospect of a link to Iceland looks likely. • Intend to have more pumped-hydro power (which might suit expansion in later phases)
Planned Western Link 2,200MW 420klm to Deeside Approx £1,000,000,000 ( Siemens and Prysmian)
Power transmission: advantages of canal as a power corridor • Cheaper than under-sea and with much less risk • Could upgrade in smaller stages (like 500 MW stages) • Easy to monitor and maintain • Secure • Water will cool cables and improve transmission efficiency (2.4 times more current per mm 2 , than the equivalent cable if it’s buried) • Very easy to add cables to increase transmission strength as more generation comes on stream • Avoids the planning problems of pylons • Following discussions, the National Grid are evaluating this proposal.
Canal section
Transport: • From ICE “State of the Nation – Transport 2013” ,specific recommendations, included: “Supporting continued mode shift from road to rail, short sea shipping and inland waterways” Inshore water transport has lower CO2e / klm Tonne than rail and very much lower than road Carbon taxes set to rise steeply after 2020.
Transport: • Construction materials – mainly raw materials like aggregates and stone • Coal • Timber • Biomass, including timber, pellets, miscanthus, and straw • Metals • Oil and petroleum • Cars • Manufactured non-perishables • Chemicals • Containerised goods generally • Waste and recyclates • Abnormal / wide loads.
Transport: • DECC have set a target of using 50m T p.a. of biomass by 2020. • If we assume that say, 10% of this goes to inland power stations like Drax , via a canal, that’s 5m T p.a. • If we use 400T barges, that’s about 50 return trips per day! Or 500 40 tonne lorries • And that’s just one market
Transport Examples: • Canals currently used to transport many items in the UK: – Tesco Wine to Manchester – Domestic waste in London – Timber on the Caledonian • Canals play a significant role on the continent: – Mitsubishi, Ford and Renault cars on the Danube – Tata Steel from own wharf in Rotterdam But much more applicable to wider canals. Is it worth it?
Route Options • Kielder to Leeds to South Derbyshire to Hertford, then probably, Tilbury • Could supply coal from Derbyshire to Eggborough and Ferrybridge (or replacements) • Biomass to Drax Power station • Link to Humber Estuary oil refineries • Material from quarries • Steel to Humber Ports for export
Economic aspects: • Low tech nature of most work generates high economic multiplier effects. • Good opportunities for eco-towns / villages around pounds, basins and arms • Could be funded partly though uplifts in property prices and rental values.
Risks • Crossings and obstacles • Rights of way, planning consents for canal • Address potential corridor route for invasive species • Risk of more pipe leakage if we introduce soft water (probably best to take water directly to the water treatment works) • Political and financial risks, and stakeholder management • And all the stuff that no-one has thought of ! Future phases? • Planning consents for reservoirs in Scotland. • Affects on catchment areas of rivers near where reservoirs are to be built
Conclusion • The only proposal for large scale water transfer without pumping, scale being considered • £billions of savings for power transfer, with improved upgradability • Opportunities for regeneration / eco-developments • Transport – considering suitable size • Leisure and tourism opportunities • Hydro power and energy storage • Energy savings for data-centres • Possibility of flood relief in some areas? • Source for tackling fires
Further studies needed: examples: • Business plan • Assessment of future water demand: public supply, abstraction etc, including unmet demand, and value. • Water supply – adequacy, and scope for using lochs in Scotland • Water chemistry; ph levels, minerals etc and impact on pipe leakage • Environmental aspects and bio-diversity • Power transmission • Transportation studies; types and tonnages of cargo, and routes • Planning and development aspects – scope for capturing some property value uplift • District heating – distribute waste heat from power stations • Data transmission to data-centres • Possibility of flood relief in some areas. (See use of canal at Glasgow) • Leisure and tourism opportunities
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