Ireland - Mulvany Manning Dublin Principles.pdf - The Office of ...

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Hydrology DD th Month in Ireland 2005
from Mulvany/Manning to Dublin Principles
Tommy Bree, IHP/ESBI

Hydrology in Ireland
Pressures
Pathways
Receptors
Atlantic
Depressions
Complex
Geology
Topography
Slow Runoff
in Wetlands,
Peatlands
Fast Runoff
in Coastal
Urban Areas

Risk Maps
Many areas where
discharge to
groundwater
cannot occur
throughout a
significant
proportion of the
year
Sensitive to
extreme floods and
low flows.

Spatial Planning

Representative Basins
Diverse configurations leads to difficulties
in estimation for ungauged basins
High density gauging networks
Pooling groups for low flows and for floods
Websites “point and click”, outputting
basin maps and descriptors.

Era of Empirical Hydrology
Thomas John Mulvany studied drainage basins
with recording raingauges and continuous
records of water level upstream of a control
weir
Time of concentration and "rational method"
(Q=CIA) emerged 1845-1852
Land drainage was a famine relief measure
Schemes increased from five or six to the order
of 100
Brothers William and Thomas Mulvany later left
Ireland and set up the Hibernian Mining
Company in Germany. Mulvany-straase in
Dusseldorf is named after William.

Thomas Mulvany’s Publications
‘On the drainage of the Mantua Turloughs in the
County of Roscommon, and the formation for that
purpose of a deep cut through Kinclare Bog’ 1849
‘On the use of screw pumps for unwatering works’
1851
‘On the use of self-registering rain and flood
gauges in making observations of the relations of
rainfall and of flood discharges in a catchment’
1851

Robert Manning
Born in Normandy, France in
1816, came to Ireland and
practiced as an estate
accountant and lawyer
Joined Board of Works and
asked a colleague for “a book
on hydraulics which was not
too difficult for a beginner”
Promoted to Chief Engineer in
1874. At the age of 75, he
retired in December 1891.
Served as president of the
Institution of Civil Engineers of
Ireland in 1877-1878.

Manning’s n
U = C R 2 / 3 S 1/ 2
Formula presented in 1889 to Institution of Civil
Engineers of Ireland
Based on experiments of Darcy and Bazin at Dijon
(1860-1865), on seven international formulas and
on extensive local observations
Similar procedure to IHP! eg FRIEND
Manning’s n used in all software systems today.

Manning’s Definition of Problem
“Although the science of hydraulics is now nearly
250 years old, it is less than half that time since
anyone could calculate even approximately the
velocity or surface inclination of water flowing in
an open channel of given dimensions.”
“Anyone who has carefully studied the subject
must have come to the conclusion that it is almost
hopeless to obtain a strictly mathematical solution
of the problem, and that even to observe and
record correctly the physical data required is a
matter of extreme difficulty, not to say
impossibility”. (1891, p 161-162)

From 1700s to 1900s
Navigation early 1700s
Catchment drainage 1800s,
culminating in the 1945 Arterial
Drainage Act which specified
that drainage must be a on
basin-wide basis
Reservoirs for hydropower and
water supply and flood control,
1900s
Systems Hydrology and IHP
JCI Dooge and JE Nash

Integrated Water Resource
Management
Cornerstone of IHP
IWRM based on the four Dublin Principles
presented at the World Summit in Rio de Janeiro
in 1992
Dublin Declaration sets out recommendations for
action at local, national and international levels to
reduce the water scarcity, through four guiding
principles.
EU Water Framework Directive
EU Floods Directive

Dublin Principles
Fresh water is a finite and vulnerable resource,
essential to sustain life, development and the
environment
Water development and management should be
based on a participatory approach, involving
users, planners and policy-makers at all levels
Women play a central part in the provision,
management and safeguarding of water
Water has an economic value in all its
competing uses and should be recognized as an
economic good.

Boyne Basin Site Visit
UNESCO Heritage Site
Navigation, Drainage
Manning’s Drainage
District