Project progress- Dam operation manual -

6 July, 2015

Phạm Xuân Tiến

SHIRAKAWA Nobuyuki

Expected output on the project

Output 4：Structural measures for flood resilience are strengthened in target 4 provinces

Activity 4-2：Develop operation manuals for effective use of existing four (4) major reservoirs in Quang Binh Province.

After the basement survey (Dec. 2013)

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five (5)

Kick-off point (Sep. 2013)

Background of activity

PPC gave the instruction to develop operation manuals for dam reservoirs with gates which have a total volume larger than 1 million m3.

Some earth-fill dams in Quang Binh Province collapsed due to heavy rainfall in 2010.

There are quite a lot of dams without good maintenance. Sometimes their gates and other facilities can not work well by electrical or mechanical system’s problems.

Sometimes downstream area was struck by discharge from dam. So citizens request more proper and safety dam operation.

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4

Location of target damsNot target

Introduction

In Quang Binh Province, there are 6 target dam reservoirs,

including Sông Thai that has already developed manual.

“Côngty Thủy Nông” (hereinafter referred to as “Provincial

Irrigation Company”) manages all of them.

At first, we checked the name of target dam reservoirs.

And we confirmed Rào Đá was not target dam reservoir,

because it has already developed manual that was

approved by PPC in Nov. 2009.

Provincial Irrigation Company agreed to cooperate to

develop manuals. So we took charge of part of development

manuals. Provincial Irrigation Company took charge of

Vực Tròn and Phú Vinh, and DIFSC took charge of Phú

Hoà and Minh Cầm.

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6

Location of target dams (Reviewed)Not target

Provincial Irrigation Company

Not target

Provincial Irrigation Company

General of target dams

Name：Minh Cầm

Height：13.4m

Crest length：190.0m

Catchment area：14.00km2

Total volume：6,850,000m3

Normal water level：El.19.50m

Name：Phú Hòa

Height：22.0m

Crest length：573.0m

Catchment area：12.50km2

Total volume：9,300,000m3

Normal water level：El.30.33m7

Minh Cầm

There are five slide gates.

But they does not have any motors,

so we can not operate them easily.

(Photo : All gates open)

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Phú Hòa

There is wildness in downstream

area.

(Photo : Downstream area)

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Input

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Study meeting

We conducted capacity development assistance for verification of DIFSC, we held study meeting 4 times about the enhancement of dam safety, and we introduced Japanese dam.

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Field study

To develop more practical manuals, we went to the target dam sites and other, such as major dam sites or disaster areas in 2010.

(Photo : Repair work at Vực Tròn)

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Run-off analysis

It turn up that there

was no hydrological data

itself in river basin of

Phú Hoà, so Japanese

side supported

extrapolation method by

using adjoining areas

data, such as Kien

Giang and Cao Khe

stations.(Photo : Phú Hoà Reservoir)

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Output

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Achievement

Japanese side think we did all necessary

support and reached needful outcome.

DIFSC has already formulated the manual of

Minh Cầm with the technical support of

Japanese side and it will be used as a

reference.

For Phú Hoà, Japanese side supported run-off

analysis.

The other two manuals of Vực Tròn and Phú

Vinh have already formulated by Provincial

Irrigation Company and consultant. 15

Change of capacity

Kick-off point (Sep. 2013)

Only few middle-level staff of DIFSC can

verify manuals.

⇓

Present (Jul. 2015)

Some junior staff of DIFSC can verify

manuals.

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Issues

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Minh Cầm

DIFSC thinks the manual is efficient to

as a reference.

And DIFSC will be able to analyze run-

off and reservoir operation by

themselves on the basis of past activities

such as study meetings or other.

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Example of analysis result of

reservoir operation

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Phú Hòa

DIFSC has completed the run-off

analysis, but DIFSC will analyze

reservoir operation and etc. continually.

DIFSC will need a support of prescribed

certified consultant to complete as a

manual that is approved by PPC.

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