Metro Vancouver Fraser Sewerage Area Infrastructure
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Infrastructure Vulnerability to Climate Change – Fraser Sewerage Area Final Report December 2009 Infrastructure Vulnerability to Climate Change – Fraser Sewerage Area Final Report December 2009 KWL File No. 251.221 INFRASTRUCTURE VULNERABILITY TO CLIMATE CHANGE – FRASER SEWERAGE AREA FINAL REPORT DECEMBER 2009 METRO VANCOUVER STATEMENT OF LIMITATIONS This document has been prepared by Kerr Wood Leidal Associates Ltd. (KWL) for the exclusive use and benefit of Metro Vancouver for the Infrastructure Vulnerability to Climate Change – Fraser Sewerage Area. No other party is entitled to rely on any of the conclusions, data, opinions, or any other information contained in this document. This document represents KWL’s best professional judgement based on the information available at the time of its completion and as appropriate for the project scope of work. Services performed in developing the content of this document have been conducted in a manner consistent with that level and skill ordinarily exercised by members of the engineering profession currently practising under similar conditions. No warranty, express or implied, is made. COPYRIGHT NOTICE These materials (text, tables, figures and drawings included herein) are copyright of Kerr Wood Leidal Associates Ltd. (KWL). Metro Vancouver is permitted to reproduce the materials for archiving and for distribution to third parties only as required to conduct business specifically relating to the Infrastructure Vulnerability to Climate Change – Fraser Sewerage Area. Any other use of these materials without the written permission of KWL is prohibited. KERR WOOD LEIDAL ASSOCIATES LTD. Consulting Engineers 251.221 INFRASTRUCTURE VULNERABILITY TO CLIMATE CHANGE – FRASER SEWERAGE AREA FINAL REPORT METRO VANCOUVER DECEMBER 2009 CONTENTS EXECUTIVE SUMMARY ................................................................................................. I 1. INTRODUCTION ...............................................................................................1-1 1.1 PROJECT BACKGROUND..................................................................................................................1-1 1.2 PIEVC PROTOCOL..........................................................................................................................1-1 1.3 STUDY SCOPE AND TIME FRAME......................................................................................................1-2 1.3.1 COLLECTION SYSTEM .........................................................................................................1-2 1.3.2 ANNACIS ISLAND WASTEWATER TREATMENT PLANT (AIWWTP)...........................................1-3 1.4 PROJECT TEAM...............................................................................................................................1-3 2. CLIMATE CHANGE ..........................................................................................2-1 2.1 BACKGROUND.................................................................................................................................2-1 2.1.1 CLIMATE CHANGE ADAPTATION...........................................................................................2-1 2.1.2 OTHER CLIMATE EFFECTS ..................................................................................................2-2 2.2 GEOGRAPHY OF STUDY AREA .........................................................................................................2-3 2.3 CLIMATE BASELINE .........................................................................................................................2-4 2.4 CLIMATE CHANGE ASSUMPTIONS ....................................................................................................2-5 2.4.1 PRECIPITATION...................................................................................................................2-6 2.4.2 RAINFALL ...........................................................................................................................2-7 2.4.3 SNOWFALL .......................................................................................................................2-10 2.4.4 SEA LEVEL RISE...............................................................................................................2-10 2.4.5 TEMPERATURE .................................................................................................................2-12 2.4.6 DROUGHT ........................................................................................................................2-13 2.4.7 WIND SPEED....................................................................................................................2-13 2.4.8 EXTREME SEA LEVEL EVENTS...........................................................................................2-14 2.4.9 FLOODING........................................................................................................................2-15 2.5 SUMMARY OF CLIMATE CHANGE ASSUMPTIONS .............................................................................2-16 3. INFRASTRUCTURE .........................................................................................3-1 3.1 INTRODUCTION AND OBJECTIVES .....................................................................................................3-1 3.2 INFORMATION SOURCES ..................................................................................................................3-1 3.3 FRASER SEWERAGE AREA ..............................................................................................................3-1 3.3.1 COLLECTION SYSTEM .........................................................................................................3-2 3.3.2 ANNACIS ISLAND WASTEWATER TREATMENT PLANT.............................................................3-3 3.3.3 COLLECTION SYSTEM .........................................................................................................3-3 3.3.4 ANNACIS ISLAND WASTEWATER TREATMENT PLANT.............................................................3-5 3.4 DESIGN CRITERIA............................................................................................................................3-7 3.5 INFRASTRUCTURE OPERATIONS .......................................................................................................3-9 3.5.1 INTERCEPTOR SEWAGE COLLECTION ..................................................................................3-9 3.5.2 COMBINED SEWER OVERFLOWS .........................................................................................3-9 3.5.3 SANITARY SEWER OVERFLOWS.........................................................................................3-11 3.6 SPECIFIC JURISDICTIONAL CONSIDERATIONS .................................................................................3-13 3.6.1 COLLECTION SYSTEM .......................................................................................................3-13 3.6.2 ANNACIS ISLAND WASTEWATER TREATMENT PLANT...........................................................3-15 3.7 DATA SUFFICIENCY .......................................................................................................................3-15 4. VULNERABILITY ASSESSMENT ....................................................................4-1 4.1 OBJECTIVES AND METHODOLOGY ....................................................................................................4-1 4.2 ASSESSMENT RESULTS ...................................................................................................................4-3 4.2.1 GENERAL ...........................................................................................................................4-3 KERR WOOD LEIDAL ASSOCIATES LTD. ASSOCIATED ENGINEERING (B.C.) LTD. 251.221 INFRASTRUCTURE VULNERABILITY TO CLIMATE CHANGE – FRASER SEWERAGE AREA FINAL REPORT DECEMBER 2009 METRO VANCOUVER 4.2.2 INTENSE RAIN ....................................................................................................................4-3 4.2.3 TOTAL ANNUAL/SEASONAL RAIN .........................................................................................4-7 4.2.4 SEA/RIVER LEVEL ELEVATION.............................................................................................4-8 4.2.5 STORM SURGE.................................................................................................................4-11 4.2.6 FLOODS ...........................................................................................................................4-12 4.2.7 HIGH TEMPERATURE ........................................................................................................4-12 4.2.8 DROUGHT ........................................................................................................................4-14 4.2.9 WIND ...............................................................................................................................4-14 4.3 OTHER POTENTIAL CHANGES THAT AFFECT THE INFRASTRUCTURE.................................................4-18 4.3.1 COLLECTION SYSTEM .......................................................................................................4-18 4.4 DATA SUFFICIENCY .......................................................................................................................4-20 5. INDICATOR ANALYSIS ...................................................................................5-1