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S
On average rare storm events will produce big oods. In volume
4 of The Flood Estimation Handbook (IOH, 1999) Table 3.1 shows
the relationship between rainfall frequency and ood frequency. For
common events the rainfall rarity is greater than the resulting ood
frequency. When the storm rarity gets to the 1 in 1000 year event
the resulting ood has the same rarity. The revitalised rainfall runoff
method (Kjeldsen et. al. 2005) that largely replaces the method in the
FEH, equates storm and ood return period over all event rarities.
During the winter when the soil moisture decit (SMD) is zero, this
equivalence is logical, but during the summer when there can be a sig-
nicant SMD the resulting ood will depend on the joint probability
of SMD and the effective rainfall (Clark, 2007). Since the antecedent
SMD and storm depth are uncorrelated we can write:
R
p
ood = R
p
SMD x R
p
ER (2)
Where: R
p
ood = return period of the ood, R
p
SMD = return period of
SMD, R
p
ER = return period of the effective rainfall, (rainfall – SMD).
The frequency relationship of SMD has been determined at Charldon
Hill Research Station (CHRS) using weighing lysimeters which have
been in service since 1995 (Clark, 2002b, 2007). By applying the new
rainfall frequency relationships and the joint probability model to the
rainfall recorded during major historic events that have resulted in a
ood whose frequency can be realistically assessed, a measure of how
realistic the rainfall frequency is in relation to the ood frequency,
can be produced. The same procedure was also applied to the rainfall
frequency used in the New Guide to ood estimation in England and
Wales (Clark, 2008b). The steps in this procedure are listed below.
r 1. Use gauging station data and historic oods where available to
determine a realistic ood frequency curve.
r 2. Calculate the antecedent SMD using local rainfall data and rela-
tionships between temperature and evaporation.
r 3. Obtain the area average depth and duration of rainfall.
r 4. Calculate the effective rainfall as actual rainfall – SMD.
r 5. Use the relationship ARF
T
= (yT
1
+ 1.5) exp y.s/9.382, Where
ARF
T
= area reduction factor for the given storm rarity; yT
1
+ 1.5
= value of y at a given return period + 1.5 years. S = Log ARF
min
/
Log 9.382; y = equation 1. To determine the point rainfall depth =
areal rainfall depth/ARF.
r 6. Estimate the rarity of the point rainfall using the new FEH and
New Guide.
r 7. Estimate the rarity of the ood using equation 2.
r 8. Compare results with that given by the ood frequency curve.
The basis for the ood frequency curves include gauging station data
and historic oods in the case of the Lud at Louth (Arellano and
Clark, 2004), and the Rother at Woodhouse Mill (Clark, in prep);
historic oods and an estimate of the bankfull discharge for the river
Brue at Bruton (Clark, 1999) and the Camel at Wenfordbridge
(Clark, 2009); historic oods in the case of the Valency at Boscastle
(Clark, 2006). For Withycombe Brook at Exmouth, the data of
Harrison (1961) were reworked since it was found that there was a
big gap in his record and that both the estimated bankfull discharge
and maximum ood were unrealistic. A further check on the resulting
ood frequency curve at Exmouth was made using the New Guide
(Clark, 2008b) technique of estimating the median ood. The result
compared well with that suggested from the ood frequency curve
based on the highest ve oods. The revitalised FEH method also
gave a comparable value for the median ood in this case, but the
growth curve was far too low (Figure 3). Table 3 shows the results for
six sites and seven events for which reliable data have been obtained.
There are wide differences in the estimated return period of the storm
and ood using the new FEH results.
By comparing the ratios of expected and observed return periods
for both methods there is a clear difference between the FFC and
new FEH results, which diverge with increasing ood rarity (Figure
4). This is a direct result of differences in storm rarity. Taking the
highest ratio between storm and ood frequency, it is not possible to
have a ood that takes place 35 times more frequent than the rainfall
that should have caused it to happen. The ratios for the oods on
the Valency and Brue for the 1917 ood are also too great to have
been produced by inadequate data. In contrast to these results those
produced using the rainfall frequency relations in the New Guide are
much more realistic.
DISCUSSION
For dam design and safety assessments the main nding of this paper
is that the estimates of extreme rainfall are too low in the Defra (In
Press) report. In making this assessment no account is made of any
future changes in climate, but then no allowance was made by the
present author simply because it adds more uncertainty to an already
difcult area of hydrometeorology.
There are two main drawbacks to the new study. The rst is the
omission of the highest measured rainfall in Britain, a fact that is hard
to substantiate when that is very close to the core of the investigation.
The second is the big mismatch of the rarity of the ood producing
rainfall and the rarity of the resulting ood. This is most clear for the
rarer events and it is unfortunate that more well documented oods
could not have been tested using the same procedure. A further dis-
appointment in the Defra study is the lack of an assessment of PMP.
The study has only used one method to estimate rainfall up to the 1 in
100,000 year event. The level of uncertainty at this rarity calls for the
use of a wider range of techniques in order to give greater condence
in the results.
During 2010 a New Guide for ood estimation will be published.
This will contain estimates of extreme rainfall, detailed examples of
T-year ood estimation, and further tests of the methodology using
historic oods and storm events. In that way dam safety and ood
alleviation schemes can proceed on a more sound basis.
The author is Colin Clark, Charldon Hill Research
Station, Shute Lane, Bruton, Somerset, England BA10
0BJ. Email: colin4chrs@hotmail.com
52
JUNE 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION
PROJECT DEVELOPMENT
IWP& DC
Table 3: Estimates of the return period (years) of seven flood events based on the flood frequency
curve (FFC) (column 4) and using the new FEH (column 5) and New Guide (column 6) methods
1 2 3 4 5 6 7 8
Site Rainfall (mm) Duration (hr) SMD FF Defra FEH New Guide 5/4 6/4
Lud (29/5/1920) 150 3-3.5 26 19000 675000 33000 35.5 1.7
Brue (28/6/1917) 190 12 47 1352 12000 1570 8.9 1.2
Brue (12/7/1982) 94 10 41 71 360 67 2.5 0.9
Withycombe Brook, (6/10/1960) 31 1.5 0 99 117 98 1.2 1.0
Camel (8/6/1957) 103 7.5 30 91 242 92 2.7 1.0
Valency (16/8/2004) 160 4.5 12 10460 144000 9700 13.8 0.9
Rother (25/6/2007) 64 23 4 65 80 56 1.2 0.9
WWW.WATERPOWERMAGAZINE.COM JUNE 2010 53
PROJECT DEVELOPMENT
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service. Contact us for inflatable water control gates and rubber
dams.
PO Box 668, Fort Collins, CO 80522 USA
Tel: 970-568-9844
www.obermeyerhydro.com
HYDRO CASTINGS
• Water turbine components
• Castings from 100 kg to 30 tons
• Latest CAD-CAM capabilities
• Certified Quality Assurance ISO 9001
• Environmental Management System ISO14001
Your contact: Mr. Timo Norvasto, Sales Manager
Lokomo Steel Foundry
Tel: +358 204 84 4222
Fax: +358 204 84 4233
Email: timo.norvasto@metso.com
Web: www.metsofoundries.com
CONCRETE COOLING
• COLD & ICE WATERPLANTS
• FLAKE ICE PLANTS
• ICE DELIVERY & WEIGHING SYSTEMS
• ICE STORAGES
KTI-Plersch Kältetechnik GmbH
Carl-Otto-Weg 14/2
88481 Balzheim
Germany
Tel:/Phone: +49 - 7347 - 95 72 - 0
Fax: +49 - 7347 - 95 72 - 22
Email: ice@kti-plersch.com
Website: www.kti-plersch.com
WORLD MARKETPLACE
WWW.WATERPOWERMAGAZINE.COM JUNE 2010 57
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HYDROMECHANICAL
EQUIPMENT
HYDRO POWER
PLANT EQUIPMENT
HYDRO POWER
PLANT EQUIPMENT
ANDRITZ HYDRO GmbH
Penzinger Strasse 76, A-1141 Vienna, Austria
Phone: +43 (1) 89100-0, Fax: +43 (1) 8946046
contact-hydro@andritz.com • www.andritz.com
Your Partner
for renewable and clean energy
We focus on the best solution – from water to wire.
Voith Hydro Holding GmbH & Co. KG
Alexanderstrasse 11
89522 Heidenheim/Germany
www.voithhydro.com
A Voith and Siemens Company
! Water power plant equipment
(electrical and mechanical)
! Pumps
! Governors
! Automation
! Modernization of existing power plants
! Hydro power services
! Ocean energies
INSTRUMENTATION
(DAM MONITORING)
INSTRUMENTATION
(DAM MONITORING)
Vikas Kothari: Executive Director Tel: 91 11 29565552 TO 55
Om Metals Infraprojects Ltd. Fax: 91 11 29565551
4th Floor, NBCC Plaza, Mobile: 91 98110 68101
Tower III, Sector 5, Email: vikas@ommetals.com
Pushp Vihar, info@ommetals.com
Saket, New Delhi, 110 017, INDIA Web: www.ommetals.com
T
urnkey EPC contracts for:
•Radial Gates •Trash Racks & TRCM
•Vertical Gates •Gantry Cranes & EOT
•
Penstocks •Mechanical/ Hydraulic Hoists
•Stoplogs •Draft Tubes
Turnkey EPC contracts for:
•Radial Gates •Trash Racks & TRCM
•Vertical Gates •Gantry Cranes & EOT
•
Penstocks •Mechanical/ Hydraulic Hoists
•Stoplogs •Draft Tubes
Om Metals
Reliable and innovative solutions utilizing
over 156 years continuos hydro-electric
experience.
Fully customised supply of turbines,
generators, controls, switchgear &
associated plant up to around 20MW,
including a micro hydro range of turbines.
Japan: Gilbert Gilkes & Gordon Ltd
h-yamamo@rf6.so-net.ne.jp
North America:
Vancouver Island Technology Park
2103 - 4464 Markham Street
Victoria BC V8Z 7X8
b.sellars@gilkes.com
t: 250-483-3883
UK: Gilbert Gilkes & Gordon Ltd,
Canal head North, Kendal,
Cumbria LA9 7BZ
[ M
hydro@gilkes.com
!
World wide referenced water to wire General Contractor
!
Turbines and Generators
! Electromechanical Equipment
!
Switchgears
!
Control Protection Monitoring and SCADA Systems
!
Balance of the Plant
! Turn key projects
! Rehabilitation
S.T.E. S.p.a. - Via Sorio, 120 - 35141, PADOVA(Italy)
tel. +39 049 2963900 - fax. +39 049 2963901
Email: ste@ste-energy.com Web: www.ste-energy.com
ISO 9001 CERTIFIED
Geokon, Incorporated manufactures a full range
of geotechnical instrumentation suitable for
monitoring dams. Geokon instrumentation employs
vibrating wire technology that provides measurable
advantages and proven long-term stability.
The World Leader in
Vibrating Wire Technology
TM
Geokon, Incorporated
4
8 Spencer Street
Lebanon, New Hampshire
03766
•
USA
Dam Monitoring Instrumentation
1
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603
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448
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1562
1
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603
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448
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3216
info@geokon.com
www.geokon.com
Dam Safety Instrumentation • Fiber Optic and
Vibrating Wire Technologies • In-Situ Testing
and Turn-Key Solutions
• Piezometers
• Pressure Cells
• Extensometers
• Crackmeters
• Inclinometers
• Tiltmeters
1-877-ROCTEST
info@roctest.com • www.roctest.com
33.1.64.06.40.80
info@telemac.fr • www.telemac.fr
INSTRUMENTATION
(GEOTECHNICAL)
WORLD MARKETPLACE
58 JUNE 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION
CLASSIFIED
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SMALL HYDROELECTRIC
POWER SETS
SMALL HYDROELECTRIC
POWER SETS
TRASHRACK RAKES
MICRO/SMALL
HYDROELECTRIC POWER SETS
INSTRUMENTATION
(GEOTECHNICAL)
SCREENING
Planning a run-of-river project?
Reduce your capital costs signicantly!
Why a coanda intake?
● Eliminates desander
● Protects your investment
from premature wear
and debris.
● Flows up to 25 M3/sec.
● Screens out debris
down to 0.5mm
● Customizable for
a range of conditions
● MAXIMIZES POWER
GENERATION
Partial Discharge?
www.pdix.com
PARTIAL DISCHARGE DETECTION
+43 - 7234 - 83 902
WORLD MARKETPLACE
WWW.WATERPOWERMAGAZINE.COM JUNE 2010 59
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VALVES FOR HYDROELECTRIC POWER PLANTS
●
Butterfly Valves
●
Spherical Valves
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Cone Jet Valves
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Needle Valves
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Sleeve Valves
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Pressure Reducing Valves
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Airation Valves
Adams Schweiz AG
Austrasse 49, CH 8045 Zürich, Switzerland
P
hone: +41 (0) 44 461 54 15
Fax: +41 (0) 44 461 50 20
e-mail: sales@adamsarmaturen.ch
Internet: www.adamsarmaturen.ch
VALVES VALVES WATER TURBINES
WATERPROOFING
WATERPROOFING AND PROTECTION
of concrete and RCC dams,
embankment dams, hydraulic tunnels,
canals, reservoirs
WITH FLEXIBLE SYNTHETIC MEMBRANES
Turnkey projects: design manufacturing,
supply, installation.
CARPI TECH
Corso San Gottardo 86
CH 6830 Chiasso - Switzerland
Tel: +41 91 695 4000 Fax: +41 91 695 4009
Email: info@carpitech.com Web: www.carpitech.com
Stronger together.
Member of the Group of companies
Gleneld Valves Ltd your specialist manufacturer of Discharge,
Control, Non-Return and Isolating Valves (including Buttery
Valves and Gate Valves) for:
• Dams and Reservoirs
• Water Transmission Pipelines
•
Power Stations.
For a world wide network of
manufacturing and service
o
rganisations offering local
support please contact :
Gleneld Works, Queens Drive,
Kilmarnock, Ayrshire,
K
A1 3XF, UK
T: +44 1563 521150
F: +44 1563 545616
E: enquiries@gleneld.co.uk
F
or details of our full product
r
ange please refer to our website:
www.gleneld.co.uk
INDUSTRY SHOWCASE
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Published by
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22, Civil Lines, Roorkee 247 667, India
Tel. +91-1332-272752, 272258
Email : ncb_rke@rediffmail.com
INVALUABLE BOOKS FROM INDIA
∗ MOSONYI EMIL
Water Power Development
Vol.I - Low Head Power Plants (£82.00 inclusive of air postage)
Vol.II - High Head Power Plants (£82.00 inclusive of air postage)
∗ NIGAM P. S.
Hand Book of Hydro Electric Engineering
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Hydro Power Structures
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Embankment Dam Engineering
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∗ VARSHNEY R. S. - GUPTA S.C. - GUPTA R. L.
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Vol. I - Channels & Tube wells (£10.00 inclusive of air postage)
Vol. II - Canals & Storage works (£17.00 inclusive of air postage)
∗ BHARAT SINGH
Fundamentals of Irrigation Engineering
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BOLTIGHT Bolt Tensioners
Special and Standard Bolt Tensioners for Water
and Wave Energy, S tructural and other Critical
Bolting Applications.
Reliable and superior quality bolt tensioners
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sales@boltight.com
Call: +44 845 500 5556
Website: www.boltight.com
Yo u r p a r t n e r
for renewable and clean energy
Water is generally a source of fasci-
nation and inspiration. But to us at
ANDRITZ HYDRO, it means even
more because it represents a constant
challenge to create up-to-date tech-
nological innovations.
Utility compan-
ies from all over the world value our
know-how and commitment, and trust
in the safety and reliability of our tailor-
made energy generation solutions. From
equipment for new, turnkey hydro-
power plants, and the refurbishing and
overhaul of existing installations, to
comprehensive automation solutions.
We focus on the best solution – from
water to wire.
ANDRITZ HYDRO GmbH
Penzinger Strasse 76, 1141 Vienna, Austria
Phone: +43 (1) 89100, Fax: +43 (1) 8946046
contact-hydro@andritz.com
www.andritz.com
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