Williston Reservoir Bathymetry
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Peace River Project Water Use Plan Williston Reservoir Bathymetry Reference: GMSWORKS 25 Williston Reservoir Bathymetric Mapping Study Period: June 2010 to June 2013 Final Terrasond Precision Geospatial Solutions December 31, 2013 WILLISTON RESERVOIR BATHYMETRIC MAPPING GMSWORKS #25 Contract No. CO50616 Project Report Report Date: December 31, 2013 TABLE OF CONTENTS 1.0 PROJECT LOCATION .................................................................................................................. 1 2.0 SCOPE OF WORK ....................................................................................................................... 2 2.1 Terms of Reference ....................................................................................................................... 2 3.0 SURVEY TEAM .......................................................................................................................... 2 4.0 SURVEY DATES .......................................................................................................................... 3 5.0 HORIZONTAL CONTROL ............................................................................................................ 4 5.1 Horizontal Datums ........................................................................................................................ 4 5.2 Horizontal Accuracy ...................................................................................................................... 4 5.3 Horizontal Control and Verification .............................................................................................. 4 5.3.1 Differential GPS Positioning .................................................................................................. 4 5.3.2 Control Recovery ................................................................................................................... 5 5.3.3 Real‐Time Positioning Verification ........................................................................................ 6 6.0 VERTICAL CONTROL .................................................................................................................. 8 6.1 Vertical Datums ............................................................................................................................. 8 6.2 Vertical Control Survey ................................................................................................................. 8 6.3 Water Level Gauge Locations........................................................................................................ 8 6.4 Primary Gauge Site ........................................................................................................................ 9 6.5 Secondary Gauge Sites ................................................................................................................ 10 6.6 Benchmark Establishment .......................................................................................................... 13 6.7 Comparison with GPS derived Elevations ................................................................................... 16 6.8 GEOID Model CGG2005 .............................................................................................................. 16 7.0 EQUIPMENT ............................................................................................................................ 18 7.1 Survey Vessels ............................................................................................................................. 18 7.2 Survey Sensors ............................................................................................................................ 19 7.2.1 Camp Barge ......................................................................................................................... 19 8.0 Tide Gauge Deployment ......................................................................................................... 20 9.0 ACQUISITION PROCEDURES .................................................................................................... 21 9.1 General Method .......................................................................................................................... 21 9.2 Survey Dates Summary ............................................................................................................... 21 9.3 Real‐Time Coverage .................................................................................................................... 22 9.4 Number of Passes ....................................................................................................................... 23 10.0 CORRECTIONS TO SOUNDINGS ............................................................................................... 24 10.1 Patch Test Calibrations ................................................................................................................ 24 10.2 Sound Velocity Casts ................................................................................................................... 25 10.2.1 Method ............................................................................................................................... 25 10.3 Squat Settlement ........................................................................................................................ 27 10.3.1 Method ............................................................................................................................... 27 10.4 WATER LEVEL PROCESSING ......................................................................................................... 28 10.4.1 Method ............................................................................................................................... 28 10.4.2 Processing ........................................................................................................................... 28 11.0 CARIS PROCESSING ................................................................................................................. 29 11.1 Bathymetry Processing Procedure .............................................................................................. 29 12.0 DELIVERABLES ........................................................................................................................ 32 12.1 Charts .......................................................................................................................................... 32 12.1.1 Location ............................................................................................................................... 32 12.1.2 Background Data ................................................................................................................. 35 Williston Reservoir Bathymetric Mapping June 30, 2013 Page | i GMSWORKS #25 12.1.3 Bathymetry and Sounding Sources ..................................................................................... 35 12.2 Drawings ..................................................................................................................................... 39 12.3 Points .......................................................................................................................................... 40 12.3.1 2009 LiDAR .......................................................................................................................... 40 12.3.2 2010‐2011 Bathymetry ....................................................................................................... 40 12.3.3 2004 and 2011 Photogrammetry ........................................................................................ 40 12.4 Fledermaus .................................................................................................................................. 40 12.4.1 Overview ............................................................................................................................. 40 12.4.2 Deliverables ......................................................................................................................... 41 APPENDICES Appendix A 1 : 50,000 Scale Charts Appendix B 1 : 10,000 Scale Charts Appendix C Horizontal Control Recovery Appendix D Horizontal Position Checks Appendix E Benchmark Descriptions Appendix F Sounding Accuracy Summary Appendix G Vessel Offset Diagrams Appendix H Caris Vessel Configuration Files Appendix I Terms of Reference Williston Reservoir Bathymetric Mapping June 30, 2013 Page | ii GMSWORKS #25 1.0 PROJECT LOCATION Williston Reservoir is a reservoir in central British Columbia impounded by the WAC Bennett Dam. The southernmost part of the reservoir is 180 km north of Prince George, BC. It consists of three main arms about a central confluence. The Finlay Arm to the north and the Parsnip Arm to the south run generally southeast‐northwest in the Rocky Mountain Trench. The Peace Arm runs to the east through the Rocky Mountains and terminates at the WAC Bennett Dam near Hope, BC. Each arm is approximately 120 kilometers long and varies from two up to ten kilometers wide. The entire perimeter eat th waterline is roughly 1420 kilometers. The reservoir is remote with few facilities on the water and limited road access provided by logging roads primarily along the Finlay and Parsnip Arms. The town of Mackenzie is on the south end and the First Nations village of Tsay Keh Dene is on the north end of the Reservoir. The normal operating draft of the reservoir