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| Pointe du Bois Spillway Replacement Project EIS| June 2011 1.1
1.0 INTRODUCTION
1.1 Need and Purpose
The Pointe du Bois Generating Station1
Despite extensive repairs and upgrades that have been conducted over the years, the spillway facilities at Pointe du Bois require replacement in order to maintain public and dam safety and provide a safer working environment for staff. Accordingly, Manitoba Hydro has decided to undertake the Pointe du Bois Spillway Replacement Project (the Project). With these improvements, the current Canadian Dam Association Dam Safety Guidelines (2007) will be addressed.
is the oldest hydroelectric plant operating in Manitoba. The station was constructed between 1909 and 1926 with the first unit put into service in 1911. The existing spillway facilities consist of ninety-seven spillway/sluiceway bays. With the exception of six remotely controlled bays, they are manually operated. In 2002, Manitoba Hydro acquired the station as part of the purchase of Winnipeg Hydro. Figure 1.1 illustrates the general location of the Pointe du Bois facilities.
1.2 Scope of the Spillway Replacement Project
The Project will be constructed just downstream of the existing spillway and rockfill dam. It will consist of the following activities and components:
♦ Construction and operation of the following permanent structures:
• Primary spillway including approach and discharge channels;
• Secondary spillway;
• Transition structures and wing walls; and
• Earthfill dams.
♦ Construction and operation of the following permanent infrastructure:
• Construction/permanent power; and
• Townsite access roadway.
♦ Construction and decommissioning of the following construction infrastructure:
• Work areas;
• Buildings;
• Concrete batch plants and crushing operations;
1 Words shown in bold contain a definition that is described in greater detail in the Glossary found in Chapter 13.0.
| Pointe du Bois Spillway Replacement Project EIS| June 2011 1.2
• Construction access (includes barge landings, winter ice roads and lower spillway shelf road);
• Construction roadways;
• Stabilization of the east gravity dam;
• Material source areas;
• Excavated material placement area;
• Cofferdams;
• Stormwater management ponds;
• Water, wastewater and waste management;
• Fuel storage and transportation; and
• Explosives storage.
♦ Decommissioning of the following existing structures:
• Existing spillway and water retaining structures (not including the powerhouse).
The existing powerhouse will continue to be operated and maintained. The operation and maintenance of the powerhouse is not within the scope of the Spillway Replacement Project.
The general arrangement of the Project is outlined on Figure 1.2.
307
317
315
213
435
313
314
302
214
520
408 309206 212
302
Whiteshell Provincial Park
Nopiming Provincial Park
Birds Hill Provincial Park
Grand Beach Provincial Park
Beaudry Provincial Park
Camp Morton Provincial Park
Whitemouth Falls Provincial Park
Patricia Beach Provincial Park
Winnipeg Beach Provincial Park
Duff Roblin Park Reserve
Poplar Bay Provincial Park
Norris Lake Provincial Park
Hyland Provincial Park
Lockport Provincial Park
Memorial Provincial Park
River Road Provincial Park
Netley Creek Provincial Park
Pinawa Provincial Park
Libau
Pinawa
Dugald
Warren
Rosser
Inwood
Gimili
Teulon
Selkirk
Narcisse
Stonewall
Powerview
Birds Hill
Pine Falls
Fraserwood
Clandeboye
Headingley
Whitemouth
Beausejour
Grand Beach
Milner Ridge
Lac du Bonnet
Winnipeg Beach
Stony Mountain
Victoria Beach
St. Francois Xavier
Winnipeg
Selkirk G.S.
McArthur G.S.
Pine Falls G.S.
Great Falls G.S.
Slave Falls G.S.
Seven Sisters G.S.
Pointe du Bois G.S.
Pinawa Dam Provincial Park
DATA SOURCE: Pointe du BoisSpillway Replacement Project
File L
ocati
on:
Manitoba Hydro, Government of Canada,Province of Manitoba
DATE CREATED: CREATED BY:
REVISION NO: REVISION DATE: QA/QC:
VERSION: 1.0 RHP, MWZ0 3 6 Miles
0 8 16 Kilometres 02 FEB 2010 HPP - GIS & Special Studies
31 MAY 2011
Legend
ROAD - GENERAL
RAIL LINE
Generating Stations (G.S.)
Pointe du Bois G.S
Provincial Parks
Reserve Land
Project Location
Project Location MapFigure:
1.1
GillamThompson
Winnipeg
Churchill Hudson Bay
Flin Flon
LakeManitoba
Brandon
LakeWinnipeg
The Pas
Dauphin
90°W
90°W
95°W
95°W
100°W
100°W
105°W
105°W60°N
55°N55°N
50°N50°N
DATA SOURCE: Pointe du BoisSpillway Replacement Project
File L
ocati
on:
Manitoba Hydro, KGS Acres
DATE CREATED: CREATED BY:
REVISION NO: REVISION DATE: QA/QC:
VERSION: 1.0 RHP, MWZ, BMP0 0.05 0.1 Miles
0 0.1 0.2 Kilometres12 MAY 2011 HPP - GIS & Special Studies
Principal Structures Figure:1.2
East MainDam
Discharge Channel
Primary SpillwayEast Abutment Dam
Approach Channel
West MainDam
Powerhouse East AbutmentTransition Wall
South Dam
31 MAY 2011
Secondary Spillway