Technical Data Of Ahning Dam
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General
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| Reservoir Storage | 275 x 106 m3 |
| Useful Drawdown | 113 m to 73 m MSL |
| Reservoir Area | 12 sq. km |
| Catchment Area | 122 sq. km |
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Dam
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| 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
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Spillway
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| 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 |
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Draw-Off
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| 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 |
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Construction
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| 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.