September_1966 — Page 63

2000

1713

1000

Woh

1

Jor

Menglang

tunnel

|

intake

1538-5

1516-5

Lengkok

1692

CIVIL ENGINEERING AND PUBLIC WORKS

$_Bot

MENGLANG TUNNEL

Miles HORIZONTAL

LONGITUDINAL SECTION OF TUNNELS

SCALES :-

Mlies

Feet 1000 VERTICAL

Chief Resident Engineer, Mr. W. Phillips, B Sc (Eng), DIC, MICE, MIWE, describes here the biggest of the hydro-electric schemes constructed in the Cameron Highlands of Malaya by the National Electricity Board

Buopil s

Upper

Surge

Shaft

1660

1300,

Woh underground

power station access tunnel

❤Odak power station!

&$ Batang Padang

Pressure shafts-

320 185

1000 2000 Feet

Tailrace tunnet

Tailrace basin

S

a

BATANG PADANG PROJECT

TARTED in June 1964, the Batang Padang hydro-electric scheme is continuation of the 100 MW Cameron Highlands scheme complet- ed in 1963. It is the final project in the National Electricity_Board's series of developments in the Cameron High- lands and is due for completion in

1968.

The scheme extends from the 17th to the 7th Milestone, Cameron High- lands Road and incorporates the Woh Power Station which will have an in- stalled capacity of 150 MW and will yield an annual average output of 470 million units.

It will operate as a peak load station, supplying power to the Board's consumers throughout the industrialis- ed areas of the west coast of the States of Malaya.

There is a natural division of the Batang Padang scheme into two sec- tions. The northern section at 17th Milestone will comprise an impound- ing reservoir the Jor reservoir and the main tunnel intake known as the Menglang intake. Water will be led through the Menglang tunnel to the southern section at 7th Milestone where the Woh power station is locat- ed.

Jor Reservoir

Waters from the Batang Padang, Sekam and Jor Rivers, in addition to the discharge from the existing Jor Power Station (Sultan Yussuf Power Station) at 19th Milestone, will be im- pounded in Jor reservoir. Of 1,700 acre-feet capacity the Jor reservoir is formed by the construction of the Jor main dam and Jor saddle dam,

Before construction of the Jor main dam could start, it was essential to divert the water, and this was done by the construction of a 14 ft. dia- meter 450 ft. long diversion tunnel, leading into a 29 ft. diameter 1,000 ft. long spillway tunnel. Both these

tunnels are concrete lined throughout

Far East Architect & Builder September, 1966

and

some sections of the spillway tunnel are heavily reinforced with steel arches and steel reinforcement rods where bad rock conditions in the granite were met.

The two dams, 150 ft. and 70 ft. high respectively, are constructed of rolled earth fill, the total volume of fill required being about 1 million cu. yd. The decomposed granite earth fill is obtained from nearby bor-

Stilling basin for the Jor Dam spillway viewed from downstream; impact blocks in the foreground, culvert outlet beyond

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