September_1966 — Page 64

BATANG

PADANG

HYDRO ELECTRIC SCHEME

jor

power station.

JOR RESERVOIR

(Cameron Highlands

Scheme)

JOR SADDLE

DAM

BOT ADIT

UPPER

SURGE SHAFT

SURGE SHAFT

ADIT

TAILRACE BASIN

ODAK

POWER STATION

Semai

LAMEL

Ransak

Tunnel

S Bot

Tidong

Woh Tunnel

SWoh

Ringlet Reservoir

(Cameron Highlands Scheme)

Bot

PAHANG

PERAK

padang

Bembar

4

MENGLANG

INTAKE

JOR MAIN DAM

LENGKOK

INTAKE

BOT INTAKE

CHENES INTAKE:

Busgk

†TIDONG INTAKE

HE

WOH INTAKE

WOH

POWER STATION

$ Batang

SWITCHYARDI

PUBLIC WATER SUPPLY INTAKE

Telom

SCALE:-

→To Kuala Lumpur 39 miles

Mile

t

2 Miles

row areas, the material being excavat- ed by means of three 2 cu. yd. face shovels and transported to the dams in sixteen 16 cu, yd, rear dump trucks along specially constructed haul roads.

The material is then spread by bull- dozers into 9 in. layers and consoli- dated to approximately 6 in. layers by rubber-tyred rollers on the clay cores and vibrating rollers on the shoulder and transition zones of the dams.

A fully equipped soils laboratory on the site keeps a continuous check on all fill materials. Drilling and cement grouting of the rock underlying the core of the dams is being carried out, which with a concrete cut-off wall in the dam foundations, will ensure an effective water barrier to possible seepages below the dams.

To control excessive floods in the Jor reservoir after impounding, a con- crete siphon bellmouth spillway, 150 ft. high and 125 ft. top diameter, cap- able of discharging up to 39,000 cusecs. of water through the spillway tunnel, is under construction. The flood water will then pass through a stilling basin to break up the force of the flood discharge before joining the Batang Padang River downstream of Jor dam.

A reservoir outlet controlled by two 72 in. valves will be set in the inlet structure of the diversion tunnel so as to lower the reservoir level if required.

An 8 ft. wide road will be con- structed from the Cameron Highlands Road to Menglang intake over the crests of both the Jor main and Jor saddle dams.

Jor main dam. Euclid tippers standing on the upstream shoulder with the partly built syphon bellmouth spillway beyond

60

Far East Architect & Builder September, 1966