See the bottom of a lock (with no water in it). This is Carpenters Road Lock in London, which also featured here.
h/t CELR
See the bottom of a lock (with no water in it). This is Carpenters Road Lock in London, which also featured here.
h/t CELR
Posted in Built heritage, Canals, Economic activities, Engineering and construction, Extant waterways, Foreign parts, Industrial heritage, Operations, Restoration and rebuilding, waterways, Waterways management
Tagged canal, canal & river trust, Carpenters Road Lock, gates, lock, Operations, sill, stop-planks
An interesting piece of information from Waterways Ireland’s feasibility study on the restoration of the Longford Branch of the Royal Canal. We learn on page 44 that the Royal Canal needs, on average, 10 million gallons of water per day to cope with “lockages, leakage, seepage and evaporation” and that the current supply arrangements, with much pumping, are costing €300,000 a year.
Posted in Ashore, Built heritage, Canals, Drainage, Economic activities, Engineering and construction, Extant waterways, Industrial heritage, Ireland, Operations, Restoration and rebuilding, Sources, waterways, Waterways management, Weather
Tagged evaporation, gallons, Ireland, leakage, lockage, Operations, pump, pumping, Royal Canal, seepage, water level, water supply, Waterways Ireland
On 28 January 1907 James Robinson Kilroe [near the bottom of the page] of H M Geological Survey read to the Royal Irish Academy a paper on “The River Shannon: its present course and geological history” [Proceedings of the Royal Irish Academy Vol XXVI Section B No 8 Hodges, Figgis & Co Ltd, Dublin; Williams & Norgate, London 1907]. I thought that Plate V was interesting.
Kilroe wrote:
It will be perceived that instead of the river being shallow over the unyielding Silurian slate-rock, set almost vertically, and striking across the river-course, it is deeper than over the limestone of Lough Derg, and much deeper than over the comparatively easily eroded Old Red Sandstone at Killaloe. The river-bed actually drops below the datum line above the town, while at the town it is 100 feet above datum.
Old Red Sandstone strata are here to be seen in the river-bank, and Silurian rocks in situ in its bed. A barrier is thus formed, partly of Silurian, and partly of Old Red Sandstone rocks, which without the artificial impounding weir would retain the waters of Lough Derg to a depth of some 104 feet opposite Derrycastle — two miles above Killaloe.
One might have expected to find a fairly level shallow bed from Killaloe northward, a sudden drop from slate-rock to the sandstone floor, and a pronounced wide, well-formed valley in the limestone district southward to Limerick.
None of these elements exist; instead, we have the formidable barrier at Killaloe, naturally damming up a considerable depth of water in Lough Derg, and the river falling away southward by a series of rapids which correspond with drops in the canal, south of O’Briensbridge […], along an alternative course, possibly one used by a branch of the Shannon.
Here is an extract from the Plate V map, showing the steps of the (pre-Ardnacrusha) Limerick Navigation between Lough Derg and the sea.
Kilroe wrote of Lough Ree:
The waters of Lough Ree stood some 10 feet higher within recent times than they now do, as proved by evidence of solution, with under-cutting of limestone blocks, to be seen about five miles north-west of Athlone, close to the railway, in the townland of Cornaseer.
Under these conditions the lake must have been, perhaps, twice its width, and for a considerable period. Its ancient surface-level is clearly indicated by the caps of the mushroom-shaped blocks.
And of the Shannon between Lough Ree and Lough Derg:
The extreme flatness of the river between Athlone and Meelick is such that, consequent upon the completion of the Suck Drainage-works in 1892, it was found that the callows along the Shannon above the confluence of the Suck at Shannonbridge were much more liable to sudden and frequent floodings than they previously had been.
The more rapid discharge of the Suck waters into the Shannon, before ordinary extra water had time to pass away, had the effect of modifying the regimen of the main stream to an extent which resulted in an action at law [La Touche -v- The Suck Drainage Board].
I have found only one account of that case, in the Freeman’s Journal of 1 July 1893. The plaintiffs, Messrs Harrison and La Touche, owned land at Cappaleitrim, on the west bank of the Shannon above Shannonbridge. They said that the actions of the Suck Drainage Board had caused their lands to be flooded:
[…] that the defendants brought water from the Suck into the Shannon, containing a drainage of 40 miles, with such velocity and such volume that the Shannon was penned back, and that the back water caused the damage to the lands complained of.
[…] The jury disagreed and were discharged.
I don’t know whether the matter ever again came before a judge.
Posted in Ashore, Built heritage, Canals, Drainage, Economic activities, Engineering and construction, Extant waterways, Industrial heritage, Ireland, Irish waterways general, Natural heritage, Operations, People, Safety, Shannon, Sources, The cattle trade, waterways, Waterways management, Weather
Tagged bridge, canal, Cappaleitrim, Cornaseer, Doonass, drainage, estuary, floods, flow, Ireland, Killaloe, Kilroe, Limerick, lock, Lough Derg, Lough Ree, O'Briensbridge, Operations, RIA, Shannon, Shannonbridge, Suck, water level, waterways
There is to be a maritime history conference in Cork next weekend:
Maritime History Conference to take place in University College Cork 28/29 November
Maritime History Conference‘A safe place for ships’: Cork, Ireland, Europe and the Sea
University College CorkFriday, 28 November – Saturday, 29 November
Main Campus: Electrical Engineering BLDG, L-1, UCC
Details here; h/t AD.
It appears that these new-fangled railways are here to stay, displacing the passage-boat and the mail-coach, the Scotch cart and the lumber boat.
Accordingly, I have rearranged my small number of railway-related pages under a top-level heading of their own.
I have added a new railway page, about the Lundy Island Railway and Colonization Company, from the Dublin Evening Mail of 2 May 1845. Gerald M King has produced stamps for Lundy, including Railway Parcel Stamps, but it is not clear whether they depict any of the engines or rolling stock described in the Mail and there are few other sources of information about the railway.
I have tried to explain as many of the references as I could, but some are still obscure to me and I would welcome comments from those expert in Irish religious conflicts of the 1840s (as well as those knowledgeable about railways and other technology of the period).