Power Intake
Figure 15: Murum spillway view post
impoundment
The intake tower is a reinforced concrete structure
bank-tower type. There are two intakes; each
with a design discharge capacity of 172m3/s and
dimension of 50m wide x 18.6m long x 54.5m
high (see Figure 16 and 17). The top and base
surface elevation is 547masl and 492.5masl
respectively with a total discharge capacity is
344m3/s. The intakes are controlled by a set of
hydraulic operated fixed wheel gates that can
close automatically under emergency conditions.
The intake structure is protected by a floating log
boom to stop debris or logs from impacting its
performance by entering the intake.
Murum Power Intake
Type
Surface
Dimension
18.6m long x 50m wide x
54.5m high
Rated Flow
172 m3/s per bay
Power Tunnels
Figure 16: Overview of power intake after
construction. Intake for Tunnel No.1 on right.
Figure 17: View of power intakes post
Impoundment
The twin 2.65km underground water tunnels
connect the power intakes to the powerhouse.
Each tunnel consists of a 1,445m long and 8m
diameter upper horizontal section (see Figure
18), a 60m high, 25m diameter surge tank, a
174m long 6.2m diameter shaft and a 1,229m
long 5.5m diameter horizontal section (see Figure
19). In-situ tests were carried out to determine
the design parameters of the rock for the
design of the concrete and steel liners, and
to determine the extent of the steel liner. The
in-situ tests carried out included plate load
tests to determine in-situ deformation of the
rock mass, hydro-fracturing and hydro-jacking
tests to determine in-situ stresses of the rock
mass, etc.
Murum Power Tunnel
2
Concrete and Steel
8m to 3.4m
2.65km
No. of tunnel
Type of lining
Tunnels diameter
Length of tunnel
23