Water Power and Dam Construction. Issue December 2010

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WWW.WATERPOWERMAGAZINE.COM DECEMBER 2010 41

DAM SAFETY

derived a PMF of 18,400m3/sec. The spillway on the main dam was

designed to contain the 1 in 10,000-yr ood within the width of the

ogee crest, whilst the PMF would be accommodated with overspill

over the full width of the dam.

The main dam is 75m high and 400m overall crest length,

designed as a gravity dam and constructed of some 600,000m3

of roller compacted concrete. The dam is founded within the

narrow limestone gorge through which the wadi ows. An ungat-

ed Roberts Type aerated spillway with 200m wide ogee crest and

splitter teeth [1] extends over the central half of the dam crest.

Physical model tests were carried out to conrm the conguration

and dimensions of the spillway crest and downstream apron with

scaled discharge rates up to 90m3/sec/m and a depth of over 10.5m

over the crest. The adjacent saddle dam is nearly 50m high from

base of core trench to crest, with a crest length of some 360m. A

2.1 km long grout curtain extends into the abutments and beneath

the foundations of the dams. A fuller description of the construc-

tion has been published elsewhere [2].

TROPICAL CYCLONE

By June 2007 preparation of the rock foundation was under

way when Oman was hit by tropical Cyclone Gonu. The cyclone

brought unprecedented rainfall, widespread ooding and damage.

One rain gauge on the edge of the catchment recorded 935mm in

24 hours. At Wadi Dayqah the cofferdams were washed away

and the excavation lled with coarse alluvium. The peak ow at

the site during Cyclone Gonu was estimated to be of the order of

10,000m

/sec; some 40% greater than the original 1 in 10,000-

year design ood. The ood hydrology was revisited in the light

of this event resulting in a revised 1 in 10,000 design ood of

13,500m

/sec, almost twice the original design gure [3]. The

PMF was unaltered. The assessment of long return period oods

in climates with infrequent but severe events and relatively short

data sets cannot be an exact science and the results were cross-

checked by comparison with global experience of extreme events

using modied Creager and Rodier curves [4 & 5].

The selection of the design ood return period followed general

UK practice for dams as this has historically been the norm in Oman,

making the dam Category A. The spillway works were therefore

designed such that oods up to the 1 in 10,000 year ood would

be accommodated by the main dam spillway and oods in excess of

the 1 in 10,000 ood and up to the PMF, will also spill over the dam

roadway crest. Some damage will be accepted for PMF conditions,

provided the works remained stable. Without any design changes the

increase in the 1 in 10,000 year ood resulting from the re-assessment

of the hydrology would result in spilling over the dam roadway on

more frequent occasions (1 in 100 year ood), thus failing to meet

the original design criteria.

The model tests on the 196m long central overspill indicated good

hydraulic performances up to a unit discharge of 72.5m3/m/sec and

with an unstable, but acceptable, performance up to the maximum

unit ow tested of 84.2m3/m/sec. These corresponded to discharg-

es over the central spillway section of 14,200 and 16,500m3 /sec

respectively. The latter case was the 18,400m3/sec PMF event with

additional water passing over the dam road crest.

Options were reviewed to identify practical modications that

would accommodate the revised design oods, meet design criteria

acceptable to MRMWR and be initiated during construction with

least implications on project cost and programme.

The principal means available for increasing spillway

capacity were:

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either side.

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design).

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events.

Reducing the crest level of the spillway would reduce the storage

capacity of the reservoir which was unacceptable to the ministry.

Whilst these investigations were being carried out construction

continued, including casting the spillway apron and the start of place-

ment of the roller compacted concrete for the main dam.

Following an initial review the ministry opted to follow a recom-

mendation from their panel of experts for the main spillway to be

modied to accommodate a ood of similar size to that experienced

The day Wadi Dayqah roared

Above: Fig 4 – The adjacent saddle dam is nearly 50m high with a crest length

of some 360m.

Above: Fig 5 – Comparisons were made using modiﬁed Creager and Rodier curves

Below: Fig 3 – Physical model tests were carried out to conﬁrm the conﬁgura-

tion and dimensions of the spillway crest and downstream apron

42 DECEMBER 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION

ENVIRONMENT

in Cyclone Gonu and for greater oods to overtop the full width of

the dam. After viewing the various options put forward, the panel of

experts suggested further consideration of the fusegate principal with

a sacricial pre-cast parapet in place of the upstream hand railing on

the raised crest of the dam. The panel’s suggestion was adopted and

developed into a counterbalanced pre-cast parapet which replaced the

handrailing on the upstream side and could be accommodated within

the restricted width of the original crest. This solution provided a

practical and inexpensive means of containing the 1 in 10,000-year

ood within the spillway whilst not overloading the dam in the PMF.

It thus met the originally intended safety criteria in line with interna-

tionally established dam safety practice.

The nal modications comprised:

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right abutment.

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CZN

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railing.

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left abutment apron wall.

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freeboard in the PMF.

MAIN DAM STABILITY

An increase in water level in the reservoir increases the loading

on the dam. Initial analyses using the parameters used at the time

of the original design indicated little scope for accommodating

any increase in water load. Although the factors of safety were

acceptable for normal operating conditions and 1 in 1000-year

ood events, for the PMF the factors of safety for overturning

stability fell below the acceptable target value of 1.20. For a PMF

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the roadway of the main dam, the factor of safety against sliding

fell below unity.

Assumptions, such as concrete characteristics, made at the time of

design are necessarily conservative. With construction underway it

was now possible to use the concrete characteristics for the material

in place and to recognise the quality of construction that was being

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with an

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yses carried out for the crest road cross-section and for the spillway

overow cross section showed that the cross-sections proposed in

the design modications met the original design criteria for factors of

safety under the various dened load conditions.

DESIGN AND TESTING

The counter balanced parapet wall was introduced to contain the

1 in 10,000-year ood, but topple over in the event of signicantly

larger ood.

The wall was designed to tip when the upstream water level was

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adequate for the wall to tip with the upstream water level between

the top of the wall and 1m above.

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and set up in a purpose built ume to test the theory. The proto-

type tests demonstrated that the wall units will function as required.

Bedding the wall on mortar (as intended by the design) had a sig-

nicant effect on the water level required to tip the unit. Without a

mortar bedding (or other such seal) uplift below the wall made the

wall tip prematurely.

The proposed modications were selected so that they could be

constructed using the same materials, methods, equipment and tower

crane layouts as were being used to construct the original design.

Water in the wadi had been diverted into the diversion culverts

in November 2007 allowing construction of the dam to proceed.

At the end of June 2008, when the revised design proposals were

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height. The nal pour was on hold pending con rmation of the

main dam crest level.

At the downstream toe of the main dam the apron was still under

construction. The only area of conict between the design modica-

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right abutment of the main dam. This was readily overcome by rela-

tively minor modications to the 17m high wing walls. Concreting

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ahead of programme.

FIRST MAJOR FLOOD

Full impounding began with the closing of the second diversion

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potential heavy rainfall associated with Tropical Cyclone Phet,

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ness for a large inow. The rst rains of Cyclone Phet fell at the

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dam site but it must be stressed that these gures come from a

Above: Fig 6 – Raging ﬂood waters ﬂowed 6m above the dam crest

WWW.WATERPOWERMAGAZINE.COM DECEMBER 2010 43

ENVIRONMENT

single rain gauge which cannot be held to be representative of the

whole catchment.

Run-off was very rapid and available records show the reservoir

level rising from 158m asl to a peak of 177.75m asl in approxi-

mately six hours. The reservoir level reached spillway crest level

for the rst time at 9.30am on 4 June and continued to rise. By

that time power was lost to the site and the electronic level instru-

ments failed.

Members of the MRMWR Wadi Dayqah dam monitoring team

were present at the site throughout the event and made valuable

observations, notes and photographic and video records.

The rst meaningful ood experienced by the Wadi Dayqah

dams resulted in a simultaneous rst lling and rst major dis-

charge over the spillway. One estimate (based on intermittent read-

ings indicating the rate of rise in reservoir level) has put the peak

ood ow entering the reservoir as high as 9000m

/sec although

it was probably less than this upper bound gure and closer to the

peak outow. By the time the reservoir reached its peak level the

discharge over the spillway was 5200m

/sec as assessed from the

rating curve; this discharge is equivalent to between a 1 in 25 and

1 in 50 year event under the revised design hydrology established

in the wake of Cyclone Gonu.

A newspaper article reported that ‘In what local residents have

described as a humbling experience, raging ood waters owed a

staggering six metres above the crest in an unremitting thunderous

roar that lasted several hours.’

Rainfall at the site during Cyclone Phet actually exceeded that

reported during Cyclone Gonu by 20% and is estimated to have

been greater than a 1 in 200 year rainfall event. However by

observation, in the catchment as a whole, rainfall during Cyclone

Phet was clearly less than in Cyclone Gonu. Three days after the

cyclone, the dams were inspected by representatives from the

designers, the contractors, the MRMWR and its panel of experts.

The structures of the main dam and the saddle dam are considered

to have performed satisfactorily under rst lling and during the

rst meaningful ood.

Seepage from the foundation and abutments of the main dam

with the reservoir full followed a similar pattern to that recorded

in inspections in March 2010 when the reservoir was half full. As

would be expected, seepage ows increased under full reservoir

head but were still acceptable and less than predicted following

the March inspection.

After Cyclone Phet, seepage ows at the main dam have gen-

erally decreased as the reservoir level dropped but an area of

concentrated seepage at a jointed limestone outcrop on the right

abutment of the saddle dam is being investigated with a view to

some further grouting.

Even for engineers accustomed to seeing dam spillways in oper-

ation, the sight of the spillway at the peak of the ood during

Cyclone Phet left a lasting impression. For the population in a

country where waterfalls are almost unknown, in the days follow-

ing Cyclone Phet, the discharging spillway was a dramatic specta-

cle and a popular attraction.

An Oman newspaper headline declared: ‘When Wadi Dayqah

roared’ and reported that ‘the dam not only held up admirably to

Cyclone Phet’s fury, but it also transformed into a breathtakingly

striking waterfall attraction, the likes of which Oman has never

witnessed before.’ [7].

Saleh Hamood Al Harthy, Director of Dams Department

Ministry of Regional Municipalities & Water Resources,

Oman; M J Hieatt, Black & Veatch International Ltd,

Redhill, UK; J K Hall, Black & Veatch Ltd, Redhill,

UK; and M Wheeler, Black & Veatch International Ltd,

Chester, UK

The authors thank Under Secretary HE Ali Mohammed

Al-Abri and his staff at the Ministry of Regional

Municipalities & Water Resources of the Sultanate of

Oman for their generous and friendly support throughout

the design and construction of this project.

The authors wish to acknowledge the technical and

managerial efforts of joint venture contractor Vinci

Grands Projets (France) and CCC Oman: they completed

construction to a high standard throughout in a remote

location and under severe climatic conditions.

The authors also acknowledge the support of Black

& Veatch and its joint venture partners NESPAK of

Pakistan and Su Yapi of Turkey throughout

Below: Fig 7 – Wadi Dayqah dam held up admirably to Cyclone Phet’s fury

References

1 Mason, P.J. (1983) Energy dissipating crest splitters for concrete dams.

International Water Power & Dam Construction, 35, No.11.

2 Prisk, M.J; Richards, M.G.; Hieatt, M.J. (2009) Delivering Wadi Dayqah,

Oman’s tallest dam; ICE Proceedings - Civil Engineering, November 2009 Vol.

162 Special Issue Two.

3 Hieatt, M.J; Hall, J.K; Wheeler, M; Richards, MG (2010) Wadi Dayqah

Dams: design modiﬁcations in the wake of Cyclone Gonu. Proceedings –

British Dams Society 16th Biennial Conference, Strathclyde UK, June 2010.

4 Creager, W.P., Justin, J.D. & Hinds, J. (1945) Engineering for Dams, vol. 1.

John Wiley, New York, USA.

5 Francou, J. & Rodier, J.A. (1967) Essai de classiﬁcation des crues

maximales observees dans le monde. In: Cah. ORSTOM. ser. Hydrol, vol. IV(3).

6 US Army Corps of Engineers (1990) Hydraulic Design of Spillways

Engineering Manual 1110-2-1603.

7 Oman Daily Observer: Features: When Wadi Dayqah roared. Saturday, June

12, 2010.

IWP& DC

44 DECEMBER 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION

COMMENT

&A activity in the hydro energy market witnessed

an increasing trend in deal making activity in 2010.

Overall, 63 deals worth $39.1B were recorded in

YTD 2010. On a quarter-on-quarter basis, the

number of deals in the hydro energy market increased from 17

M&A deals in Q1 2010 to 22 deals in Q2 2010 to 23 deals in Q3

2010. Deal value also increased substantially from $1.1B in Q2

2010 to $28.3B in Q3 2010. The deal value in 2010 was mainly

bolstered by two merger deals worth $30B.

The key deals were GDF Suez’s $21.5B merger agreement with

International Power; and FirstEnergy’s agreement to merge with

Allegheny Energy, an integrated energy company, valued at $8.5B.

Asia Pacic and North America, primarily China and the US, led

the M&A activity in terms of the number of deals in the hydro energy

market in 2010. China and the US took the top spot globally for the

overall hydro M&A activity, with nine deals each in 2010, followed

by Canada and India with ve deals each. However, Europe regis-

tered the highest deal value for M&A activity with $25.8B, pushing

North America to second place with $9.1B in 2010.

GlobalData expects that there will be an increase in the M&A

activity in the hydro energy market, driven by supportive government

policies and the increased appeal for investments in the hydro energy

sector. In light of the continued government support to the renew-

able sector, the investment activity in the hydro sector is expected

to remain robust, primarily in the Asia-Pacic region. Companies’

announcement of new budgets towards renewable energy projects

and the clouds of economic crisis withering out, there will be an

increase in M&A deal activity going forward. Improving market con-

ditions coupled with growing investor condence on the longevity of

the hydro energy sector, the market will foresee more consolidation

activity in the coming years.

For further information, and for details on a wide range

of reports on the hydro industry prepared by GlobalData,

please visit www.globaldata.com. For a listing of all the

deals registered in 2010, please visit

www.waterpowermagazine.com

Business information company GlobalData presents details on the mergers and acquisitions

that have taken place in the industry since the start of 2010

M&A activity in the hydro sector

Third quarter M&A hydro deals

Deal Deal Headline Announced

Date

Completed

Date

Month Quarter Deal Status Deal Type Deal Sub-Type Industry Deal Value Asset Name Country Region

(US$ m)

1 China Guangdong To Acquire 51% Stake In Wuyue Pumped

Storage Hydroelectric Project From China Hydro

19-Oct-10 Oct 2010 Q4 2010 Announced Asset Finance Self Funded Hydro Wuyue Pumped Storage China AsiaPacic

2 Kardemir Karabuk Demir Celik Acquires Hydroelectric Power

Plant For $14 Million From Enbati Elektrik Uretim

29-Sep-10 29-Sep-10 Sep 2010 Q3 2010 Completed Asset Finance Self Funded Hydro 13.61 Turkey Europe

3 Conduit Capital Partners Completes Sale Of Its Interest In

Edegel To Inkia Energy

28-Sep-10 28-Sep-10 Sep 2010 Q3 2010 Completed Acquisition Minority Acquisition Hydro 50 Peru S & C

America

4 Government Of Sarawak To Acquire Bakun Hydro Project From

Government Of Malaysia

26-Sep-10 Sep 2010 Q3 2010 Announced Asset Finance Self Funded Hydro 1939.09 Bakun Malaysia AsiaPacic

5 AECOM Technology To Acquire RSW 24-Sep-10 Sep 2010 Q3 2010 Announced Acquisition Majority Acquisition Hydro Canada North

America

6 Wood Group Acquires Stake In SgurrEnergy 22-Sep-10 22-Sep-10 Sep 2010 Q3 2010 Completed Acquisition Minority Acquisition Hydro United

Kingdom

Europe

7 Mega First To Acquire Additional 30% Stake In Don Sahong

Power

20-Sep-10 Sep 2010 Q3 2010 Announced Acquisition Minority Acquisition Hydro 0.61 Lao People’s

Democratic

Republic

AsiaPacic

8 GDF Suez To Acquire Energa 15-Sep-10 Sep 2010 Q3 2010 Announced Acquisition Majority Acquisition Hydro 2473.96 Poland Europe

9 LS Power To Acquire Interest In Non-Core Generating Assets

From PPL

9-Sep-10 Sep 2010 Q3 2010 Announced Asset Finance Self Funded Hydro 381 PPL University Park Power

Project, Safe Harbor, Wallingford

Power Plant

United States North

America

10 Fort Chicago Announces Project Financing Of $53 Million For

The Acquisition Of Hydro Electric Power Projects From Enmax

7-Sep-10 Sep 2010 Q3 2010 Announced Asset Finance Project Finance Hydro 53.07 Clowhom, Culliton Creek,

Furry Creek

Canada North

America

11 3sun Acquires 75% Interest In Dawson Energy 18-Aug-10 18-Aug-10 Aug 2010 Q3 2010 Completed Acquisition Majority Acquisition Hydro United

Kingdom

Europe

12 GDF Suez To Merge With International Power 10-Aug-10 Aug 2010 Q3 2010 Announced Merger Hydro 21500 UK Europe

13 CEZ To Acquire 100% Stake In Four Small Hydro Power Plants

For $58 Million

28-Jul-10 Jul 2010 Q3 2010 Announced Asset Finance Self Funded Hydro 58.48 Romania Europe

14 Energie Acquires 10% Stake In Reisseck II Hydro Power Project

From Verbund

19-Jul-10 19-Jul-10 Jul 2010 Q3 2010 Completed Asset Finance Self Funded Hydro 51.69 Reisseck II Austria Europe

15 EVN Acquires 40% Stake In Gorna Arda Hydropower Station

From National Electric

19-Jul-10 3-Sep-10 Jul 2010 Q3 2010 Completed Asset Finance Self Funded Hydro 0.91 Gorna Arda Bulgaria Europe

16 Greenko To Acquire Hemavathi Power & Light 14-Jul-10 Jul 2010 Q3 2010 Announced Acquisition Majority Acquisition Hydro 32.84 - India AsiaPacic

17 Greenko Announces Project Financing Of $23 Million For

Acquisition Of 100% Stake In Hydro Power Plant

14-Jul-10 Jul 2010 Q3 2010 Announced Asset Finance Project Finance Hydro 23.23 Hemavathy India AsiaPacic

18 Asia Power To Acquire 80% Stake In Three Hydro Power Plants

For $11 Million Fom Hongya

9-Jul-10 Jul 2010 Q3 2010 Announced Asset Finance Self Funded Hydro 11.28 Da Chang He, Hua Qiu Po and

Yang Cheng Qiang

China AsiaPacic

19 U.P. Hydro Acquires Au Train Dam And Power Plant From UPPCO 8-Jul-10 8-Jul-10 Jul 2010 Q3 2010 Completed Asset Finance Self Funded Hydro Au Train United States N America

20 SJVN Plans To Acquire 30% Stake In Khudoni Hydro Power

Project From Government Of Georgia

7-Jul-10 Jul 2010 Q3 2010 Planned Asset Finance Self Funded Hydro Khudoni Georgia AsiaPacic

21 Reliance Power To Merge With Reliance Natural Resources 4-Jul-10 Jul 2010 Q3 2010 Announced Merger Hydro 1530 - India AsiaPacic

22 Enel Green Power Sells Its 50.01% Interest In Endesa Hellas

To Mytilineos Holdings

2-Jul-10 2-Jul-10 Jul 2010 Q3 2010 Completed Acquisition Majority Acquisition Hydro 175.85 - Greece Europe

23 Enel Acquires 100% Stake In Renewable Assets For $25

Million From Endesa Hellas

2-Jul-10 2-Jul-10 Jul 2010 Q3 2010 Completed Asset Finance Self Funded Hydro 24.72 - Greece Europe

24 E.ON Energie To Sell Its 5% Stake In BKW FMB Energy To

Groupe E

1-Jul-10 Jul 2010 Q3 2010 Announced Acquisition Minority Acquisition Hydro - Germany Europe

IWP& DC

WWW.WATERPOWERMAGAZINE.COM DECEMBER 2010 45

COMMENT

HE new UK coalition government is committed to pro-

duce 15% of our energy needs from renewable sources by

2020. However this is a huge challenge given that we cur-

rently stand at around only 3%. We expect the majority

of this huge growth in renewable generation to come from onshore

and offshore wind and biomass, but the scale of the challenge is

such that we will need all forms of renewable energy to contribute,

including hydro, solar and wave and tidal.

I believe that hydro has a small but useful contribution to make

to our overall ambitions and, given constraints on public spending

and other competing priorities, we will endeavour to assist its further

deployment across the whole country.

In 2009, installed hydro capacity in the UK was around 1.6GW,

generating some 5000GWhr of electricity, equivalent to 1.4% of elec-

tricity demand. This may not sound much, but it translates into the

electricity use of more than one million homes or the output of one

new generation nuclear power plant.

We are unlikely to see any new large-scale hydro schemes being

developed because of the economic and environmental constraints,

so this means that future exploitation of hydropower in the UK will

focus on micro and small scale hydro schemes.

A number of studies have been undertaken in recent years to try to

estimate the remaining hydro potential in Scotland, England and Wales.

We estimate that there could be a remaining viable hydro resource of

around 1GW, with the potential to contribute up to a further 1% of

current UK electricity demand. This is a prize worth ghting for, and it

might be possible to develop half of this over the next ten years.

FIRST THINGS FIRST

The rst thing the Government is doing to realise this potential is

to make investing in this established technology more attractive by

providing nancial incentives. The Renewables Obligation, which

benets small and medium scale schemes up to 20MW, has been in

place since 2002. After a slow build up, it has routinely been reward-

ing hydro generators with an average £90M (US$144M) of income

a year, with a total of £730M (US$1172M) since it began. This is a

considerable llip to any industry, and even more so to a small sector

like hydropower.

However, ROCs are sometimes not suitable for micro-scale hydro-

power. That’s why the feed in tariffs (FITs) for low carbon microgen-

eration schemes were introduced in April this year. I am conscious that

the introduction of FITs has not been straightforward, because micro

hydro is still a nascent industry and there are some circumstances that

are specic to hydro and its developers. But my department has been

working exibly to provide wider eligibility for FITs, without com-

promising the standards which will build consumer and community

condence in a sector which has the opportunity for rapid expansion.

We have also been working hard on developing the Microgeneration

Certication Scheme (MCS) standards with industry. MCS transi-

tional and installer standards, agreed by the majority of the MCS

working group, have been published, and listed installer companies

and products already have access to FITs. Work is ongoing to nal-

ise an affordable MCS product standard using test data from other

installations, including from Europe. This is to ensure that consum-

ers and developers wanting FITs receive accurate information on the

likely durability and performance of their installation.

The introduction of FITs has stimulated a huge increase in applica-

tions for environmental permits and planning consents. In England

and Wales alone, the Environment Agency used to receive an aver-

age of 10 applications a year, but in 2009 this increased ten-fold to

around a hundred. In 2010, they are expecting a further doubling to

200, and they expect that level of demand to continue, largely due to

FITs. Similar levels of interest have been experienced in Scotland and

Northern Ireland, though we will have to wait to see how much of

this interest converts to new schemes on the ground, and how much

it will add to our hydro generating capacity.

Government also has a role to play in helping to address some of the

potential barriers to renewables deployment such as environmental

permitting, planning consent and access to the grid. My department

has been working very closely with the Department of Environment,

Food and Rural Affairs (Defra) and the Environment Agency over

the past year on the Hydro Permitting Review and other initiatives to

facilitate the deployment of sustainable micro and small-scale hydro

schemes in England and Wales.

The Environment Agency has already started implementing some

of the changes, which my department has been involved in. The inten-

tion behind the review is to provide a more user-friendly application

process, which also makes the most effective use of agency resources

at this time of increased interest in hydro.

Other initiatives the EA have been pursuing are the updating of the

Hydro Good Practice Guide for developers, the second phase of the

hydro resource mapping study, and the further training of their staff

to deliver a better service to hydro developers and stakeholders.

ENTHUSIASTIC DEVELOPMENT

Since taking up my post in May, I have been impressed by the enthusi-

asm shown by mill owners, communities and commercial developers

to bring dormant and new sites into use generating clean, sustain-

able and affordable electricity. I have been particularly struck by the

number of new organisations entering the eld, such as the Forestry

Commission, the National Trust, British Waterways and a number

of National Parks, albeit on a smaller scale to the traditional players

– the energy companies and the water utilities.

In their hydro resource mapping survey the Environment Agency

identied some 4-5000 ‘win-win’ sites, where the development of

hydro schemes could go hand in hand with the enhancement of the

river environment, particularly for sh. This may sound a lot, com-

pared to the 400 or so registered sites in the UK as a whole, but if we

look back a thousand years the Domesday Book listed some 6000

water mills in England alone.

I see a bright future for hydro in the UK, provided we all work

together to make it happen.

The UK coalition government’s Climate Change Minister,

Greg Barker, sees a bright future for hydro, and urges the

country’s industry and all players to work together to make

it happen. Although Barker acknowledges that hydro’s

contribution may be small in the scheme of things, he emphasises

that it is still very useful and a prize worth ghting for

Worth ﬁghting

for

IWP& DC

PROFESSIONAL DIRECTORY

46 DECEMBER 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION

CLASSIFIED

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MORE THAN 100 YEARS OF HYDROPOWER ENGINEERING

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PROFESSIONAL DIRECTORY

WWW.WATERPOWERMAGAZINE.COM DECEMBER 2010 47

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Yolsu Engineering Services Ltd. Co.

Hürriyet Caddesi No:135 Dikmen, 06450 Ankara,TURKEY

Tel: +90 312 480 06 01 (pbx) Fax: +90 312 483 31 35

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E-Mail info@stellba-hydro.ch E-Mail info@stellba.de

721

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WATER RESOURCES  POWER GENERATION

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The cl assified sect ion in Water Power & Dam

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Industry Showcases

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Telephone: +44 (0)20 8269 7854

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ENRICHING

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WORLD MARKETPLACE

48 DECEMBER 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION

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BEARING OIL COOLERS

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WWW.WATERPOWERMAGAZINE.COM DECEMBER 2010 49

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HYDRO CASTINGS

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Your contact: Mr. Timo Norvasto, Sales Manager

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Vikas Kothari: Executive Director Tel: 91 11 29565552 TO 55

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WORLD MARKETPLACE

50 DECEMBER 2010 INTERNATIONAL WATER POWER & DAM CONSTRUCTION

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SMALL HYDROELECTRIC

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To advertise in the Professional Directory or

World Marketplace section, or for more

information contact Diane Stanbury.

tel: +44 (0)20 8269 7854

or email:

dianestanbury@globaltrademedia.com

Copy deadline for Januar y 2011 issue

is 10 January 2011

I N T E R N A T I O N A L

& DAM CONSTRUCTION

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