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
59