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SOCIAL ASPECTS:


Site assessment conducted
Reference Panel approved
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Economic

Chiew Larn, Thailand
Positive sustainability aspect

Population displacement
6-8 years after implementation, surveys indicate that the Chiew Larn resettlement program was extremely effective in improving the quality of life and net income of displaced families in Thailand.

Source: IEA Hydropower Implementing Agreement - Annex VIII.
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Overview

Chiew Larn is a multipurpose water development project, providing the Thai people with electricity, flood management, irrigation, fisheries enhancement, and environmental protection benefits. The dam is constructed on the Khlong Saeng River, at Ban Chiew Larn, Amphoe Ban Ta Khun, Surat Thani province.

The dam consists of a rockfill, central clay core dam with crest elevation of 99.5 m MSL. At its normal high water level of 95.0 m, the reservoir has an active storage of 5,050 million cubic meters and a water surface of 165 sq.km2.

The powerhouse is equipped with 3 generating units and has an installed capacity of 240 MW and total generation capacity of 554 GWh per year. After project completion the Chiew Larn Dam was conferred by His Majesty the King to be called the “Rajjaprabha” Dam the English translation being “Light of the Kingdom” Dam.
Scheme Specifications

Dam Name
Scheme operator
Electricity Generating Authority of Thailand
 Size of scheme (MW)
240
Country
Thailand
 Catchment area
1435 km2
River
Klong Saeng
 Effective reservoir capacity
5050 x 106m3
Construction years

 Reservoir size
165 km2
External recognition
Nil
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