Table 1: Summary of Project Details
ITEM |
DESCRIPTION |
Project Owner / Client |
BC Hydro |
Water Source: |
Bull River |
Catchment Area at Intakes |
1528.5km2 |
Mean Annual Flow at Intakes |
31.85m3/sec (20.83 l/s/km2) |
Maximum Design Flow |
38.5m3/sec |
Gross Head |
83.9m |
Project Operation |
Run-of-River |
Maximum Power Capacity |
25MW |
Instream Flow Requirements (IFR’s) |
0.25m3/sec December to March, 0.5m3/sec April, May, October and November, 2m3/sec June to September |
Capacity Factor |
48% |
Average Annual Energy |
105GWh |
Intakes |
Existing intakes in Aberfeldie Dam, one originally in service, one blanked off, modified to produce two identical intakes of 19.25m3/sec capacity. |
Waterway |
Low Pressure Conduit (LPC) ~850 m buried 3.35m (132”) dia. Weholite HDPE plus ~150m surface-mounted 2.9m (114”) dia. steel pipes; Steel surge tank 15m high 13m dia. at junction of the LPC and HPP; 150m long 2.74m (108”) dia. steel High Pressure Penstock (HPP) down cliff face immediately behind powerhouse. |
Turbines |
3 x 8.33MW horizontal axis Francis |
Generators |
13.8kV direct-coupled synchronous |
Powerhouse |
Concrete substructure, steel superstructure |
Switchyard |
At powerhouse, step-up 13.8 to 69kV |
Transmission Line: |
None – direct connection to grid at switchyard |
Design Earthquake: |
BC Building Code – 1:2,500 event |