The Hodder and Thirlmere Aqueduct Access Gates
Compiled & Researched by the Nutters Mobile Surveillance Unit

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Thirlmere Aqueduct Construction Chronology and Stats
1 1876 - Letter from John Fredric Baternan (Chief Engineer Manchester Corporation) to the council recommends Thirlmere as an independent water source for Manchester
2 1877 - Manchester Corp applies to Parliament for special powers to use Thirlmere as a reservoir
3 1879 - Thirlmere bill passed despite opposition from locals led by John Harwood "The Thirlmere Defence Association"
4 1881 - Route of aqueduct surveyed using a long chain to mark its course
5 1886 - Work actually starts - a special rail siding built at Windermere station to relay men & materials by wagon
6 1890 - Foundation stone laid in the thirlmere dam
7 1893 - Jun 10th Major burst at R.Sprint,Kendal during testing - water shoots 50 ft and a 1/2 ton piece of pipe sent flying, no one hurt (Reported by the Westmorland Gazette)
8 1893 - Aug 9th Last section was completed at Thickholme,Troutbeck Valley after 3 years.Initially the pipes were to go under the river but the workings were washed away,then a stone viaduct was built which had to be abandoned
9 Thirlmere valley flooded 1890s originallly being two smaller lakes named Leatheswater and Wythburn water
10 Project took 7 years to complete and is 95 miles in length
11 Route to follow the 500 ft contour as closely as possible
12 4 mile tunnel through Dunmail Raise took 4 years to construct
13 Two other main tunnels under Nab Scar and Moor How
14 Thirlmere reservoir height 590 ft Manchester reservoir height 360 ft
15 Average gradient 20 inches to the mile
16 Average water speed 2-3 miles per hour
17 Thirlmere reservoir capacity 9000 million gallons approx supplying 50 million gallons per day to Manchester
18 Thirlmere dam height 58 ft - stone quarried from Longridge Lancs for this and other buildings and delivered by train (Lg quarries opened 1830 )
19 Aqueduct diameter 7 ft cut and cover (cut to 8ft wide and lined with concrete)
20 Where cut and cover could not be used the aqueduct would de fed into 4 cast iron pipes usually to cross rivers and valleys by means of syphons
21 North Wells (stone squat buildings) - built where cut and cover or tunnel changed to pipeline - in the event of a burst valves could be closed to allow repairs
22 South Wells (stone squat buildings) - built where pipeline changed to cut and cover - in the event of a burst valves could be closed to allow repairs
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26 Cost 1.5 Million