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The waterways of Galway are of great engineering significance. Major engineering
works were required to construct the waterways and they were a major influence
on the location of the first industries in Galway.
The natural drainage
channels from Lough Corrib to Galway Bay included the River Corrib, the
Gaol River or Cathedral River and the Western River or Convent River. By
the mid 19th century there were approximately 30 mills in operation in Galway.
There were two major engineering projects, which resulted in the waterways
system which exists today. The Loughs Corrib, Mask, and Carra Drainage and
Navigation Scheme was constructed between 1848 and 1858 and the Corrib-Clare
Catchment Drainage Scheme was constructed in the 1950s. The Corrib and canal
systems have over the years provided a number of benefits: navigation,
water power, drainage for the Corrib catchment, fisheries and as a source
for water supply to Galway city and surrounding areas.
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The works were based
on proposals in the McMahon Report of 1846 with some amendments. It was
an integrated scheme in that while the primary purpose was to improve
drainage (reduce winter water levels and the areas of flooded land) and
navigation in the respective catchments this was to be undertaken without
detrimental effect on the mills or fishery interests. The winter flood
level was reduced by 450mm (18") and the tailraces from the various
mills were deepened such that the water head was not impaired.
The main elements of this scheme were:
- Construction of
the Claddagh Basin and Locks
- Construction of
the Eglinton Canal and Parkavera Locks
- Dredging of channels
of Corrib, Gaol and western rivers and the various tail races
- Construction of
the Eastern Conduit
- Construction of
a deep tailrace from the Newcastle mills to the marble factory to discharge
to the river Corrib to rear of the Old Hygeia Building.
These works were designed by Commissioner Mulvany and insured that three
mill sites could be retained.
- Construction of
culverts to allow tailraces to run under headraces
- Construction of
weir and salmon pass
- Construction of
pier at Woodquay (Stamer's Quay)
- Upgrading of mills
to suit new operating levels
The main elements of
the scheme, with respect to the Galway Waterways, were:
- Excavation of the
River Corrib channel from the head of the Eglinton Canal to approximately
midway between the William O'Brien and Wolf Tone Bridges.
- Construction of
a new weir just north of the old weir.
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The Eglinton Canal provided
two main functions, firstly as a navigation channel from the Claddagh Basin
to Lough Corrib and secondly as a feeder channel to the Gaol River and Western
River and the various mills they powered. Swivel bridges, constructed from
a wrought iron frame and timber decking, were erected at five road crossings.
The canal was used
for transport of goods by boat until the early part of the 20th century.
Tolls of £370 were collected in 1880 but this had reduced to £35
in 1905 and £1 in 1916. The last boat to use the canal was the Guinness
90 foot yacht, OAmo II, in 1954. By this stage the swivel bridges were
in a poor state and it was decided to replace the bridges with fixed bridges.
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The William O'Brien
Bridge was the first bridge across the Corrib and was originally a wooden
bridge, called the West Bridge. The current bridge was rebuilt in 1851
as part of the Corrib Mask Drainage Scheme. The other bridges are the
Salmon Weir Bridge (1818), the Wolf Tone Bridge (constructed in the 1850's
as a pedestrian bridge and rebuilt in 1877 and 1935) and the Quincentennial
Bridge (1985).
The Galway Electric Light Company, run by the Perry family, converted
the mills at the current ESB premises at Newtownsmith to a hydropower
station in 1888. This operated until 1929, on completion of the Ardnacrusha
Scheme, when the ESB acquired the premises.
The Hydrology Department of NUIG prepared the Report on Hydropower Potential
of the Galway City Canals for ESB in 1985. It considered that the primary
sites for hydropower were Hunters channel and the Eglinton Canal at Parkavera
with potential of approximately 1.5MW.
However, achieving this potential would have implications for other uses
of the Galway Waterways, boating, fishing and would also result in a decrease
in the flow in the main channel of the River Corrib.
The
only operating hydropower installation on the waterways of Galway, resides
in NUI, Galway¹s McLaughlin Building, Nun's Island. This building
houses two turbines: a restored 1932 Francis turbine and a turbine manufactured
entirely from plastic. In 1980, the then University College Galway purchased
a flour mill, situated on Gaol River at Nun¹s Island.
During reconstruction of the building, the sections of a Francis turbine
were discovered. Robert Craig & Sons, Belfast originally manufactured
this 42 kW turbine in 1932 and refurbished the turbine in 1981.
The second turbine in the McLaughlin Building was installed in the mid
1980s. It is a Francis turbine manufactured entirely from plastic. It
operates on a head of 2 metres and a discharge of 2.6 cubic metres per
second. It has a power output of 32 kW.
Here is a table of
the hydropower installations that have operated in Galway since the 1860's:
REF. |
No. of
Mills
|
Land
Use |
Feed Channel |
1860's |
1950's |
2000 |
1 |
1 |
Newcastle
Distillery |
In
Ruins |
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|
2 |
1 |
Bleach
Mills |
Metal
Industries |
NUIG
Civil Eng. Labs |
Eglinton
Canal |
3 |
1 |
Marble
Works |
Hunter
Factory |
NUIG |
Eglinton
Canal |
4 |
1 |
Flour |
Mc
Donaghs Flour Mills |
MC
Laughlin Building - NUIG |
Gaol
River |
5 |
2 |
Flour |
Palmers
Flour Mills |
Gaol
River |
6 |
1 |
Wood
Factory |
Ice
Factory |
Apartments |
Gaol
River |
7 |
1 |
Brewery |
Palmers
Maize Mills |
St
Josephs College |
Western
River |
8 |
4 |
Flour |
Ruined
Mills |
CYMS
Building |
Western
River |
9 |
1 |
Saw
Mill |
Woollen
Mills |
Printers |
Eglinton
Canal |
10 |
1 |
Brewery |
Lydons
Woollen Mills |
Car
Park |
Western
River |
11 |
2 |
Paper |
Galway
Iron Foundry |
Garda
Station |
Western
River |
12 |
1 |
Flour |
Bridge
Mills |
Restaurant
& Shops |
Western
River |
13 |
3 |
Flour |
Lydons
Woollen Mills |
Apartments |
Western
River |
14 |
2 |
Flour
/ Oats |
Galway
Woollen Mills |
Mercy
Secondary School |
Eastern
Conduit |
15 |
3 |
Flour |
ESB |
ESB |
Eastern
Conduit |
16 |
2 |
Flour
/ Bark |
Battery
Charging Station |
Apartments |
Eastern
Conduit |
17 |
3 |
Flour
/ Tuck / Distillery |
Chemical
Works |
Jurys
Hotel |
Eastern
Conduit |
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