Empangan
Sistem takungan empangan merangkumi tiga kolam takungan iaitu Kolam Takungan Muda, Pedu dan Ahning. Empangan Muda dan Pedu dibina dalam tahun 1969 di bawah Skim Rancangan Pengairan Muda bertujuan untuk memberi air pengairan ke Kawasan Muda seluas 96,000 ha. bagi membolehkan tanaman padi dua kali setahun dijalankan. Manakala Empangan Ahning dibina pada tahun 1989 oleh Jabatan Kerja Raya dengan tujuan utama untuk pembekalan air domestik dan industri.
Pada tahun 1991 Empangan Ahning telah diserahkan kepada MADA bagi menjalankan kerja-kerja operasi dan penyenggaraan disebabkan oleh air dari Empangan Pedu dan Ahning akan mengalir ke satu saluran sungai hantaran yang sama untuk sampai ke ‘Pelubang Bifurcation’ di mana air akan diagihkan ke Wilayah I dan II melalui Terusan Utara dan ke Wilayah III dan IV melalui Terusan Tengah dan Selatan.
Memandangkan Empangan Muda mempunyai kawasan tadahan yang luas (984 km2) dan takungan yang rendah (160 juta m3) maka air dari Empangan Muda dialirkan ke Empangan Pedu yang m empunyai takungan yang tinggi (1073 juta m3) melalui Terowong Siong sepanjang 6.8 km untuk takungan dan perlepasan. Air untuk tujuan pengairan ke Kawasan Muda dilepaskan melalui Empangan Pedu dan Ahning.
Pengendalian dan penyenggaraan Empangan Pedu, Muda dan Ahning adalah di bawah seliaan Bahagian Pengurusan Empangan dan Sumber Air.
Empangan Pedu
Technical Data Of Pedu Dam
General |
| Reservoir Storage | 1073 x 106 m3 |
| Useful Drawdown | 97.56 m to 67.07 m MSL |
| Reservoir Area | 52 sq. km |
| Catchment Area | 171 sq. km |
Dam |
| Type | Rockfill with upstream asphaltic concrete membrane |
| Foundation | C'glomerate, quartzite, shale |
| Maximum Height | 61 metre |
| Length At Top | 220 metre |
| Width Of Base | 213 metre |
| Upstream Slope | 1 in 1.7 |
| Downstream Slope | 1 in 1.5 |
| Description | Asphaltic membrane 10 cm thick |
Spillway |
| Design Flood | 280 m3 / sec at 100.15m MSL |
| Description | Overflow spill at Batang |
| Length Of Crest | 38.1 metre |
| Crest Level | 97.56 m MSL |
Draw-Off |
| Design draw-off | 141.6 m3 / sec |
| Through Pipes | 2 x 2.6 m dia. |
| Controlled By | Hollow jet disc regulator with butterfly guard valves |
Construction |
| Excavation | 80,000 m3 |
| Rockfill | 700,000 m3 |
| Concrete | 20,000 m3 |
| Reinforcement | 1,000 tons |
Empangan Muda
Technical Data Of Muda Dam
General |
| Reservoir Storage | 160 x 106 m3 |
| Useful Drawdown | 100.6 m to 82.3 m MSL |
| Reservoir Area | 15.5 sq. km |
| Catchment Area | 984 sq. km |
Dam |
| Type | Concrete ambursen buttress with overflow spillway |
| Foundation | Quartzite, mudstone |
| Maximum Height | 37 metre |
| Length At Top | 250 metre |
| Width Of Base | 55 metre |
| Upstream Slope | 1 in 1 |
| Downstream Slope | 1.9 : 1 |
| Description | 28 buttresses @ 6.7 m centres, 0.76 m to 1.07 m thick, facing slabs 0.6 m to 1.52 m thick |
Spillway |
| Design Flood | 2,000 m3 / sec at 105.18 m MSL |
| Description | Spill-over dam |
| Length Of Crest | 93 metre |
| Crest Level | 100.6 m MSL |
Draw-Off |
| Design draw-off | 45.3 m3 / sec |
| Through Pipes | 2 x 1.4 m dia. |
| Controlled By | Hollow jet disc regulator with butterfly guard valves |
Construction |
| Excavation | 30,000 m3 |
| Concrete | 46,000 m3 |
| Reinforcement | 1,500 tons |
Empangan Ahning
Technical Data Of Ahning Dam
General |
| Reservoir Storage | 275 x 106 m3 |
| Useful Drawdown | 113 m to 73 m MSL |
| Reservoir Area | 12 sq. km |
| Catchment Area | 122 sq. km |
Dam |
| Type | Rockfill with concrete face |
| Foundation | - |
| Maximum Height | 74 metre |
| Length At Top | 270 metre |
| Width Of Base | 188.5 metre |
| Upstream Slope | 1 in 1.3 |
| Downstream Slope | 1 in 1.3 |
| Description | Upstream concrete face 300 mm thick |
Spillway |
| Design Flood | 840 m3 / sec at 117 m MSL |
| Description | Ogee crest into Kah Ing. River |
| Length Of Crest | 52 metre |
| Crest Level | 113 m MSL |
Draw-Off |
| Design draw-off | 2 x 6 m3 / sec |
| Through Pipes | 2 x 1.5 m dia. |
| Controlled By | Cone disc valve with butterfly guard valves |
Construction |
| Rockfill | 770,000 m3 |
Saiong Tunnel - Intake & Outfall
Saiong Tunnel connects the Muda and Pedu Reservoirs, to permit water collected from Muda catchment to be transferred and stored in the Pedu Reservoir. It is a concrete-lined tunnel of "horseshoe" section 4.48 m high and 4.42 m wide, about 6.8 km long. Control gates are provided at both the Intake and Outfall ends of the tunnel and access to the tunnel can be made from both gateshafts.
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