Information Sharing and Riparian DiscussionsAlmaty, Kazakhstan

May 17-19, 20111

 

Assessment Studies for the Proposed Rogun Hydropower and Regional Reservoir Project (Rogun HPP)

 

Techno-Economic Assessment Techno-Economic Assessment Study: Draft Inception ReportStudy: Draft Inception Report

TECHNO-ECONOMIC ASSESSMENT OF ROGUN HPP

This presentation covers the following two aspects:Existing Design of Rogun ProjectSummary of TEAS Draft Inception Report

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EXISTING DESIGN

Initial design studies were completed in 1978.Several studies carried out subsequently.Design revised and updated by Hydroproject Institute of Moscow

(HPI) in 2009 and 2010.

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EXISTING DESIGN (cont’d)

Main Features335 Metre High Embankment DamLive Storage of about 10 Billion M33,600 MW Generation Capacity (6 x 600 MW)Energy Output 13.3 TWhFlood Handling Capacity 7,100 M3/secConstruction Period 15 yearsStage 1 Dam up to Elev. 1110 masl with two

generating units4

OSHPC BARKI TOJIKTECHNO-ECONOMIC ASSESSMENT STUDY FOR ROGUN HYDROELECTRIC CONSTRUCTION PROJECT

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EXISTING DESIGN (cont’d)MAIN DAM

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1060

1110

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Diversion & Spillway Tunnels

Texte niveau 1 Texte niveau 2

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Powerhouse

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TEAS CONTRACT

Scope of ServicesPhase 0: Investigations of the salt domePhase I: Assessment of the existing worksPhase II: Rogun Project optionsStage 1: Assessment of the Stage 1 damPhase III: Assessment of selected Rogun option

Note: Phase III work will start only after review and acceptance of Phase II output.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT

The Draft Inception Report: includes appraisal of existing project data, provides history of Rogun Project,proposes additional site investigations,provides comments on design options and criteria,

anddiscusses the study schedule.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

HydrologySubstantial hydrological database exists;

hydrological parameters and data are, compared with many other projects, quite robust.

Probable Maximum Flood (PMF) peak discharge, presently estimated at 7,100 m3/s, will be reviewed.

Risks related to potential floods which could be created by landslides upstream or by possible glacial lake outburst floods (GLOF) will be assessed.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

Hydrology (cont’d)

Impact of PMF on existing dams downstream of Rogun will be assessed.

Sedimentation aspects will be reviewed.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

GeologySite has complex geology that has been

extensively investigated and studied.However, further investigations and monitoring

recommended for salt intrusion in the foundation, large disturbed zone downstream of the dam on the right bank, and the abutments.

Seismic parameters will be reviewed.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

Geology (cont’d)For the salt wedge, recommended that in

addition to the preventive treatment to be adopted:

adequate monitoring be set up to assess the effectiveness of the mitigation measures, and

make arrangements that would permit the mitigation measures to be reinforced, if required.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

Geology (cont’d)Keeping in view tectonic movements, an

embankment dam appears to be most appropriate for the site.

Location of the powerhouse and transformer hall caverns appears to be adequate, having been selected so as to avoid major geological discontinuities. Stabilization measures will be reviewed.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

Stage 1 DamAssessment will look at all pertinent aspects

including different dam configurations, internal watertightness provisions, spillway options, sedimentation issues and economic aspects.

Spillway capacity provided appears to be adequate but will be reviewed after assessment of the PMF.

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SUMMARY OF TEAS DRAFT INCEPTION REPORT(cont’d)

EquipmentAvailable equipment appears to be in good

condition.Utilization of this equipment will be assessed

keeping in view economic, procurement and other related aspects.

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WORLD BANK REVIEW OF TEAS DRAFT INCEPTION REPORT

The World Bank Team has reviewed the TEAS Draft Inception Report and provided comments on various aspects , including:existing project data, proposed additional site investigations,design options and criteria, andthe study schedule.

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For more information please see Executive Summary of TEAS

draft Inception Report published on the website